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2012 lines
93 KiB
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>Installing GCC</title>
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<meta name="description" content="Installing GCC">
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<meta name="keywords" content="Installing GCC">
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<meta name="resource-type" content="document">
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</style>
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</head>
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<body lang="en">
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<h1 class="settitle" align="center">Installing GCC</h1>
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<a name="index-Configuration"></a>
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<a name="index-Installing-GCC_003a-Configuration"></a>
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<p>Like most GNU software, GCC must be configured before it can be built.
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This document describes the recommended configuration procedure
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for both native and cross targets.
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</p>
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<p>We use <var>srcdir</var> to refer to the toplevel source directory for
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GCC; we use <var>objdir</var> to refer to the toplevel build/object directory.
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</p>
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<p>If you obtained the sources via SVN, <var>srcdir</var> must refer to the top
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<samp>gcc</samp> directory, the one where the <samp>MAINTAINERS</samp> file can be
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found, and not its <samp>gcc</samp> subdirectory, otherwise the build will fail.
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</p>
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<p>If either <var>srcdir</var> or <var>objdir</var> is located on an automounted NFS
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file system, the shell’s built-in <code>pwd</code> command will return
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temporary pathnames. Using these can lead to various sorts of build
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problems. To avoid this issue, set the <code>PWDCMD</code> environment
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variable to an automounter-aware <code>pwd</code> command, e.g.,
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<code>pawd</code> or ‘<samp>amq -w</samp>’, during the configuration and build
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phases.
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</p>
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<p>First, we <strong>highly</strong> recommend that GCC be built into a
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separate directory from the sources which does <strong>not</strong> reside
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within the source tree. This is how we generally build GCC; building
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where <var>srcdir</var> == <var>objdir</var> should still work, but doesn’t
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get extensive testing; building where <var>objdir</var> is a subdirectory
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of <var>srcdir</var> is unsupported.
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</p>
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<p>If you have previously built GCC in the same directory for a
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different target machine, do ‘<samp>make distclean</samp>’ to delete all files
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that might be invalid. One of the files this deletes is <samp>Makefile</samp>;
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if ‘<samp>make distclean</samp>’ complains that <samp>Makefile</samp> does not exist
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or issues a message like “don’t know how to make distclean” it probably
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means that the directory is already suitably clean. However, with the
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recommended method of building in a separate <var>objdir</var>, you should
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simply use a different <var>objdir</var> for each target.
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</p>
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<p>Second, when configuring a native system, either <code>cc</code> or
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<code>gcc</code> must be in your path or you must set <code>CC</code> in
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your environment before running configure. Otherwise the configuration
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scripts may fail.
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</p>
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<p>To configure GCC:
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</p>
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<div class="smallexample">
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<pre class="smallexample">% mkdir <var>objdir</var>
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% cd <var>objdir</var>
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% <var>srcdir</var>/configure [<var>options</var>] [<var>target</var>]
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</pre></div>
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<a name="Distributor-options"></a>
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<h3 class="heading">Distributor options</h3>
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<p>If you will be distributing binary versions of GCC, with modifications
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to the source code, you should use the options described in this
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section to make clear that your version contains modifications.
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</p>
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<dl compact="compact">
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<dt><code>--with-pkgversion=<var>version</var></code></dt>
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<dd><p>Specify a string that identifies your package. You may wish
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to include a build number or build date. This version string will be
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included in the output of <code>gcc --version</code>. This suffix does
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not replace the default version string, only the ‘<samp>GCC</samp>’ part.
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</p>
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<p>The default value is ‘<samp>GCC</samp>’.
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</p>
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</dd>
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<dt><code>--with-bugurl=<var>url</var></code></dt>
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<dd><p>Specify the URL that users should visit if they wish to report a bug.
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You are of course welcome to forward bugs reported to you to the FSF,
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if you determine that they are not bugs in your modifications.
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</p>
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<p>The default value refers to the FSF’s GCC bug tracker.
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</p>
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</dd>
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</dl>
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<a name="Target-specification"></a>
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<h3 class="heading">Target specification</h3>
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<ul>
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<li> GCC has code to correctly determine the correct value for <var>target</var>
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for nearly all native systems. Therefore, we highly recommend you do
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not provide a configure target when configuring a native compiler.
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</li><li> <var>target</var> must be specified as <samp>--target=<var>target</var></samp>
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when configuring a cross compiler; examples of valid targets would be
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m68k-elf, sh-elf, etc.
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</li><li> Specifying just <var>target</var> instead of <samp>--target=<var>target</var></samp>
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implies that the host defaults to <var>target</var>.
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</li></ul>
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<a name="Options-specification"></a>
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<h3 class="heading">Options specification</h3>
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<p>Use <var>options</var> to override several configure time options for
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GCC. A list of supported <var>options</var> follows; ‘<samp>configure
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--help</samp>’ may list other options, but those not listed below may not
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work and should not normally be used.
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</p>
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<p>Note that each <samp>--enable</samp> option has a corresponding
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<samp>--disable</samp> option and that each <samp>--with</samp> option has a
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corresponding <samp>--without</samp> option.
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</p>
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<dl compact="compact">
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<dt><code>--prefix=<var>dirname</var></code></dt>
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<dd><p>Specify the toplevel installation
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directory. This is the recommended way to install the tools into a directory
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other than the default. The toplevel installation directory defaults to
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<samp>/usr/local</samp>.
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</p>
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<p>We <strong>highly</strong> recommend against <var>dirname</var> being the same or a
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subdirectory of <var>objdir</var> or vice versa. If specifying a directory
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beneath a user’s home directory tree, some shells will not expand
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<var>dirname</var> correctly if it contains the ‘<samp>~</samp>’ metacharacter; use
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<code>$HOME</code> instead.
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</p>
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<p>The following standard <code>autoconf</code> options are supported. Normally you
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should not need to use these options.
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</p><dl compact="compact">
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<dt><code>--exec-prefix=<var>dirname</var></code></dt>
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<dd><p>Specify the toplevel installation directory for architecture-dependent
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files. The default is <samp><var>prefix</var></samp>.
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</p>
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</dd>
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<dt><code>--bindir=<var>dirname</var></code></dt>
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<dd><p>Specify the installation directory for the executables called by users
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(such as <code>gcc</code> and <code>g++</code>). The default is
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<samp><var>exec-prefix</var>/bin</samp>.
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</p>
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</dd>
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<dt><code>--libdir=<var>dirname</var></code></dt>
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<dd><p>Specify the installation directory for object code libraries and
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internal data files of GCC. The default is <samp><var>exec-prefix</var>/lib</samp>.
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</p>
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</dd>
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<dt><code>--libexecdir=<var>dirname</var></code></dt>
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<dd><p>Specify the installation directory for internal executables of GCC.
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The default is <samp><var>exec-prefix</var>/libexec</samp>.
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</p>
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</dd>
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<dt><code>--with-slibdir=<var>dirname</var></code></dt>
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<dd><p>Specify the installation directory for the shared libgcc library. The
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default is <samp><var>libdir</var></samp>.
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</p>
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</dd>
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<dt><code>--datarootdir=<var>dirname</var></code></dt>
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<dd><p>Specify the root of the directory tree for read-only architecture-independent
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data files referenced by GCC. The default is <samp><var>prefix</var>/share</samp>.
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</p>
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</dd>
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<dt><code>--infodir=<var>dirname</var></code></dt>
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<dd><p>Specify the installation directory for documentation in info format.
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The default is <samp><var>datarootdir</var>/info</samp>.
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</p>
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</dd>
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<dt><code>--datadir=<var>dirname</var></code></dt>
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<dd><p>Specify the installation directory for some architecture-independent
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data files referenced by GCC. The default is <samp><var>datarootdir</var></samp>.
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</p>
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</dd>
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<dt><code>--docdir=<var>dirname</var></code></dt>
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<dd><p>Specify the installation directory for documentation files (other
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than Info) for GCC. The default is <samp><var>datarootdir</var>/doc</samp>.
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</p>
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</dd>
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<dt><code>--htmldir=<var>dirname</var></code></dt>
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<dd><p>Specify the installation directory for HTML documentation files.
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The default is <samp><var>docdir</var></samp>.
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</p>
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</dd>
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<dt><code>--pdfdir=<var>dirname</var></code></dt>
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<dd><p>Specify the installation directory for PDF documentation files.
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The default is <samp><var>docdir</var></samp>.
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</p>
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</dd>
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<dt><code>--mandir=<var>dirname</var></code></dt>
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<dd><p>Specify the installation directory for manual pages. The default is
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<samp><var>datarootdir</var>/man</samp>. (Note that the manual pages are only extracts
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from the full GCC manuals, which are provided in Texinfo format. The manpages
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are derived by an automatic conversion process from parts of the full
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manual.)
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</p>
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</dd>
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<dt><code>--with-gxx-include-dir=<var>dirname</var></code></dt>
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<dd><p>Specify
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the installation directory for G++ header files. The default depends
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on other configuration options, and differs between cross and native
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configurations.
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</p>
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</dd>
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<dt><code>--with-specs=<var>specs</var></code></dt>
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<dd><p>Specify additional command line driver SPECS.
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This can be useful if you need to turn on a non-standard feature by
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default without modifying the compiler’s source code, for instance
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<samp>--with-specs=%{!fcommon:%{!fno-common:-fno-common}}</samp>.
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See “Spec Files” in the main manual
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</p>
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</dd>
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</dl>
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</dd>
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<dt><code>--program-prefix=<var>prefix</var></code></dt>
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<dd><p>GCC supports some transformations of the names of its programs when
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installing them. This option prepends <var>prefix</var> to the names of
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programs to install in <var>bindir</var> (see above). For example, specifying
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<samp>--program-prefix=foo-</samp> would result in ‘<samp>gcc</samp>’
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being installed as <samp>/usr/local/bin/foo-gcc</samp>.
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</p>
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</dd>
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<dt><code>--program-suffix=<var>suffix</var></code></dt>
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<dd><p>Appends <var>suffix</var> to the names of programs to install in <var>bindir</var>
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(see above). For example, specifying <samp>--program-suffix=-3.1</samp>
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would result in ‘<samp>gcc</samp>’ being installed as
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<samp>/usr/local/bin/gcc-3.1</samp>.
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</p>
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</dd>
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<dt><code>--program-transform-name=<var>pattern</var></code></dt>
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<dd><p>Applies the ‘<samp>sed</samp>’ script <var>pattern</var> to be applied to the names
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of programs to install in <var>bindir</var> (see above). <var>pattern</var> has to
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consist of one or more basic ‘<samp>sed</samp>’ editing commands, separated by
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semicolons. For example, if you want the ‘<samp>gcc</samp>’ program name to be
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transformed to the installed program <samp>/usr/local/bin/myowngcc</samp> and
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the ‘<samp>g++</samp>’ program name to be transformed to
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<samp>/usr/local/bin/gspecial++</samp> without changing other program names,
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you could use the pattern
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<samp>--program-transform-name='s/^gcc$/myowngcc/; s/^g++$/gspecial++/'</samp>
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to achieve this effect.
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</p>
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<p>All three options can be combined and used together, resulting in more
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complex conversion patterns. As a basic rule, <var>prefix</var> (and
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<var>suffix</var>) are prepended (appended) before further transformations
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can happen with a special transformation script <var>pattern</var>.
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</p>
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<p>As currently implemented, this option only takes effect for native
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builds; cross compiler binaries’ names are not transformed even when a
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transformation is explicitly asked for by one of these options.
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</p>
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<p>For native builds, some of the installed programs are also installed
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with the target alias in front of their name, as in
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‘<samp>i686-pc-linux-gnu-gcc</samp>’. All of the above transformations happen
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before the target alias is prepended to the name—so, specifying
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<samp>--program-prefix=foo-</samp> and <samp>program-suffix=-3.1</samp>, the
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resulting binary would be installed as
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<samp>/usr/local/bin/i686-pc-linux-gnu-foo-gcc-3.1</samp>.
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</p>
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<p>As a last shortcoming, none of the installed Ada programs are
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transformed yet, which will be fixed in some time.
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</p>
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</dd>
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<dt><code>--with-local-prefix=<var>dirname</var></code></dt>
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<dd><p>Specify the
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installation directory for local include files. The default is
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<samp>/usr/local</samp>. Specify this option if you want the compiler to
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search directory <samp><var>dirname</var>/include</samp> for locally installed
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header files <em>instead</em> of <samp>/usr/local/include</samp>.
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</p>
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<p>You should specify <samp>--with-local-prefix</samp> <strong>only</strong> if your
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site has a different convention (not <samp>/usr/local</samp>) for where to put
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site-specific files.
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</p>
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<p>The default value for <samp>--with-local-prefix</samp> is <samp>/usr/local</samp>
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regardless of the value of <samp>--prefix</samp>. Specifying
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<samp>--prefix</samp> has no effect on which directory GCC searches for
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local header files. This may seem counterintuitive, but actually it is
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logical.
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</p>
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<p>The purpose of <samp>--prefix</samp> is to specify where to <em>install
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GCC</em>. The local header files in <samp>/usr/local/include</samp>—if you put
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any in that directory—are not part of GCC. They are part of other
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programs—perhaps many others. (GCC installs its own header files in
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another directory which is based on the <samp>--prefix</samp> value.)
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</p>
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<p>Both the local-prefix include directory and the GCC-prefix include
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directory are part of GCC’s “system include” directories. Although these
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two directories are not fixed, they need to be searched in the proper
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order for the correct processing of the include_next directive. The
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local-prefix include directory is searched before the GCC-prefix
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include directory. Another characteristic of system include directories
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is that pedantic warnings are turned off for headers in these directories.
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</p>
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<p>Some autoconf macros add <samp>-I <var>directory</var></samp> options to the
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compiler command line, to ensure that directories containing installed
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packages’ headers are searched. When <var>directory</var> is one of GCC’s
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system include directories, GCC will ignore the option so that system
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directories continue to be processed in the correct order. This
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may result in a search order different from what was specified but the
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directory will still be searched.
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</p>
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<p>GCC automatically searches for ordinary libraries using
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<code>GCC_EXEC_PREFIX</code>. Thus, when the same installation prefix is
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used for both GCC and packages, GCC will automatically search for
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both headers and libraries. This provides a configuration that is
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easy to use. GCC behaves in a manner similar to that when it is
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installed as a system compiler in <samp>/usr</samp>.
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</p>
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<p>Sites that need to install multiple versions of GCC may not want to
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use the above simple configuration. It is possible to use the
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<samp>--program-prefix</samp>, <samp>--program-suffix</samp> and
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<samp>--program-transform-name</samp> options to install multiple versions
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into a single directory, but it may be simpler to use different prefixes
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and the <samp>--with-local-prefix</samp> option to specify the location of the
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site-specific files for each version. It will then be necessary for
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users to specify explicitly the location of local site libraries
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(e.g., with <code>LIBRARY_PATH</code>).
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</p>
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<p>The same value can be used for both <samp>--with-local-prefix</samp> and
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<samp>--prefix</samp> provided it is not <samp>/usr</samp>. This can be used
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to avoid the default search of <samp>/usr/local/include</samp>.
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</p>
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<p><strong>Do not</strong> specify <samp>/usr</samp> as the <samp>--with-local-prefix</samp>!
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The directory you use for <samp>--with-local-prefix</samp> <strong>must not</strong>
|
|
contain any of the system’s standard header files. If it did contain
|
|
them, certain programs would be miscompiled (including GNU Emacs, on
|
|
certain targets), because this would override and nullify the header
|
|
file corrections made by the <code>fixincludes</code> script.
|
|
</p>
|
|
<p>Indications are that people who use this option use it based on mistaken
|
|
ideas of what it is for. People use it as if it specified where to
|
|
install part of GCC. Perhaps they make this assumption because
|
|
installing GCC creates the directory.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-gcc-major-version-only</code></dt>
|
|
<dd><p>Specifies that GCC should use only the major number rather than
|
|
<var>major</var>.<var>minor</var>.<var>patchlevel</var> in filesystem paths.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-native-system-header-dir=<var>dirname</var></code></dt>
|
|
<dd><p>Specifies that <var>dirname</var> is the directory that contains native system
|
|
header files, rather than <samp>/usr/include</samp>. This option is most useful
|
|
if you are creating a compiler that should be isolated from the system
|
|
as much as possible. It is most commonly used with the
|
|
<samp>--with-sysroot</samp> option and will cause GCC to search
|
|
<var>dirname</var> inside the system root specified by that option.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-shared[=<var>package</var>[,…]]</code></dt>
|
|
<dd><p>Build shared versions of libraries, if shared libraries are supported on
|
|
the target platform. Unlike GCC 2.95.x and earlier, shared libraries
|
|
are enabled by default on all platforms that support shared libraries.
|
|
</p>
|
|
<p>If a list of packages is given as an argument, build shared libraries
|
|
only for the listed packages. For other packages, only static libraries
|
|
will be built. Package names currently recognized in the GCC tree are
|
|
‘<samp>libgcc</samp>’ (also known as ‘<samp>gcc</samp>’), ‘<samp>libstdc++</samp>’ (not
|
|
‘<samp>libstdc++-v3</samp>’), ‘<samp>libffi</samp>’, ‘<samp>zlib</samp>’, ‘<samp>boehm-gc</samp>’,
|
|
‘<samp>ada</samp>’, ‘<samp>libada</samp>’, ‘<samp>libgo</samp>’, ‘<samp>libobjc</samp>’, and ‘<samp>libphobos</samp>’.
|
|
Note ‘<samp>libiberty</samp>’ does not support shared libraries at all.
|
|
</p>
|
|
<p>Use <samp>--disable-shared</samp> to build only static libraries. Note that
|
|
<samp>--disable-shared</samp> does not accept a list of package names as
|
|
argument, only <samp>--enable-shared</samp> does.
|
|
</p>
|
|
<p>Contrast with <samp>--enable-host-shared</samp>, which affects <em>host</em>
|
|
code.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-host-shared</code></dt>
|
|
<dd><p>Specify that the <em>host</em> code should be built into position-independent
|
|
machine code (with -fPIC), allowing it to be used within shared libraries,
|
|
but yielding a slightly slower compiler.
|
|
</p>
|
|
<p>This option is required when building the libgccjit.so library.
|
|
</p>
|
|
<p>Contrast with <samp>--enable-shared</samp>, which affects <em>target</em>
|
|
libraries.
|
|
</p>
|
|
</dd>
|
|
<dt><code><a name="with-gnu-as"></a>--with-gnu-as</code></dt>
|
|
<dd><p>Specify that the compiler should assume that the
|
|
assembler it finds is the GNU assembler. However, this does not modify
|
|
the rules to find an assembler and will result in confusion if the
|
|
assembler found is not actually the GNU assembler. (Confusion may also
|
|
result if the compiler finds the GNU assembler but has not been
|
|
configured with <samp>--with-gnu-as</samp>.) If you have more than one
|
|
assembler installed on your system, you may want to use this option in
|
|
connection with <samp>--with-as=<var>pathname</var></samp> or
|
|
<samp>--with-build-time-tools=<var>pathname</var></samp>.
|
|
</p>
|
|
<p>The following systems are the only ones where it makes a difference
|
|
whether you use the GNU assembler. On any other system,
|
|
<samp>--with-gnu-as</samp> has no effect.
|
|
</p>
|
|
<ul>
|
|
<li> ‘<samp>hppa1.0-<var>any</var>-<var>any</var></samp>’
|
|
</li><li> ‘<samp>hppa1.1-<var>any</var>-<var>any</var></samp>’
|
|
</li><li> ‘<samp>sparc-sun-solaris2.<var>any</var></samp>’
|
|
</li><li> ‘<samp>sparc64-<var>any</var>-solaris2.<var>any</var></samp>’
|
|
</li></ul>
|
|
|
|
</dd>
|
|
<dt><code><a name="with-as"></a>--with-as=<var>pathname</var></code></dt>
|
|
<dd><p>Specify that the compiler should use the assembler pointed to by
|
|
<var>pathname</var>, rather than the one found by the standard rules to find
|
|
an assembler, which are:
|
|
</p><ul>
|
|
<li> Unless GCC is being built with a cross compiler, check the
|
|
<samp><var>libexec</var>/gcc/<var>target</var>/<var>version</var></samp> directory.
|
|
<var>libexec</var> defaults to <samp><var>exec-prefix</var>/libexec</samp>;
|
|
<var>exec-prefix</var> defaults to <var>prefix</var>, which
|
|
defaults to <samp>/usr/local</samp> unless overridden by the
|
|
<samp>--prefix=<var>pathname</var></samp> switch described above. <var>target</var>
|
|
is the target system triple, such as ‘<samp>sparc-sun-solaris2.7</samp>’, and
|
|
<var>version</var> denotes the GCC version, such as 3.0.
|
|
|
|
</li><li> If the target system is the same that you are building on, check
|
|
operating system specific directories (e.g. <samp>/usr/ccs/bin</samp> on
|
|
Sun Solaris 2).
|
|
|
|
</li><li> Check in the <code>PATH</code> for a tool whose name is prefixed by the
|
|
target system triple.
|
|
|
|
</li><li> Check in the <code>PATH</code> for a tool whose name is not prefixed by the
|
|
target system triple, if the host and target system triple are
|
|
the same (in other words, we use a host tool if it can be used for
|
|
the target as well).
|
|
</li></ul>
|
|
|
|
<p>You may want to use <samp>--with-as</samp> if no assembler
|
|
is installed in the directories listed above, or if you have multiple
|
|
assemblers installed and want to choose one that is not found by the
|
|
above rules.
|
|
</p>
|
|
</dd>
|
|
<dt><code><a name="with-gnu-ld"></a>--with-gnu-ld</code></dt>
|
|
<dd><p>Same as <a href="#with-gnu-as"><samp>--with-gnu-as</samp></a>
|
|
but for the linker.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-ld=<var>pathname</var></code></dt>
|
|
<dd><p>Same as <a href="#with-as"><samp>--with-as</samp></a>
|
|
but for the linker.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-stabs</code></dt>
|
|
<dd><p>Specify that stabs debugging
|
|
information should be used instead of whatever format the host normally
|
|
uses. Normally GCC uses the same debug format as the host system.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-tls=<var>dialect</var></code></dt>
|
|
<dd><p>Specify the default TLS dialect, for systems were there is a choice.
|
|
For ARM targets, possible values for <var>dialect</var> are <code>gnu</code> or
|
|
<code>gnu2</code>, which select between the original GNU dialect and the GNU TLS
|
|
descriptor-based dialect.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-multiarch</code></dt>
|
|
<dd><p>Specify whether to enable or disable multiarch support. The default is
|
|
to check for glibc start files in a multiarch location, and enable it
|
|
if the files are found. The auto detection is enabled for native builds,
|
|
and for cross builds configured with <samp>--with-sysroot</samp>, and without
|
|
<samp>--with-native-system-header-dir</samp>.
|
|
More documentation about multiarch can be found at
|
|
<a href="https://wiki.debian.org/Multiarch">https://wiki.debian.org/Multiarch</a>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-sjlj-exceptions</code></dt>
|
|
<dd><p>Force use of the <code>setjmp</code>/<code>longjmp</code>-based scheme for exceptions.
|
|
‘<samp>configure</samp>’ ordinarily picks the correct value based on the platform.
|
|
Only use this option if you are sure you need a different setting.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-vtable-verify</code></dt>
|
|
<dd><p>Specify whether to enable or disable the vtable verification feature.
|
|
Enabling this feature causes libstdc++ to be built with its virtual calls
|
|
in verifiable mode. This means that, when linked with libvtv, every
|
|
virtual call in libstdc++ will verify the vtable pointer through which the
|
|
call will be made before actually making the call. If not linked with libvtv,
|
|
the verifier will call stub functions (in libstdc++ itself) and do nothing.
|
|
If vtable verification is disabled, then libstdc++ is not built with its
|
|
virtual calls in verifiable mode at all. However the libvtv library will
|
|
still be built (see <samp>--disable-libvtv</samp> to turn off building libvtv).
|
|
<samp>--disable-vtable-verify</samp> is the default.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--disable-gcov</code></dt>
|
|
<dd><p>Specify that the run-time library used for coverage analysis
|
|
and associated host tools should not be built.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--disable-multilib</code></dt>
|
|
<dd><p>Specify that multiple target
|
|
libraries to support different target variants, calling
|
|
conventions, etc. should not be built. The default is to build a
|
|
predefined set of them.
|
|
</p>
|
|
<p>Some targets provide finer-grained control over which multilibs are built
|
|
(e.g., <samp>--disable-softfloat</samp>):
|
|
</p><dl compact="compact">
|
|
<dt><code>arm-*-*</code></dt>
|
|
<dd><p>fpu, 26bit, underscore, interwork, biendian, nofmult.
|
|
</p>
|
|
</dd>
|
|
<dt><code>m68*-*-*</code></dt>
|
|
<dd><p>softfloat, m68881, m68000, m68020.
|
|
</p>
|
|
</dd>
|
|
<dt><code>mips*-*-*</code></dt>
|
|
<dd><p>single-float, biendian, softfloat.
|
|
</p>
|
|
</dd>
|
|
<dt><code>powerpc*-*-*, rs6000*-*-*</code></dt>
|
|
<dd><p>aix64, pthread, softfloat, powercpu, powerpccpu, powerpcos, biendian,
|
|
sysv, aix.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><code>--with-multilib-list=<var>list</var></code></dt>
|
|
<dt><code>--without-multilib-list</code></dt>
|
|
<dd><p>Specify what multilibs to build. <var>list</var> is a comma separated list of
|
|
values, possibly consisting of a single value. Currently only implemented
|
|
for aarch64*-*-*, arm*-*-*, riscv*-*-*, sh*-*-* and x86-64-*-linux*. The
|
|
accepted values and meaning for each target is given below.
|
|
</p>
|
|
<dl compact="compact">
|
|
<dt><code>aarch64*-*-*</code></dt>
|
|
<dd><p><var>list</var> is a comma separated list of <code>ilp32</code>, and <code>lp64</code>
|
|
to enable ILP32 and LP64 run-time libraries, respectively. If
|
|
<var>list</var> is empty, then there will be no multilibs and only the
|
|
default run-time library will be built. If <var>list</var> is
|
|
<code>default</code> or –with-multilib-list= is not specified, then the
|
|
default set of libraries is selected based on the value of
|
|
<samp>--target</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>arm*-*-*</code></dt>
|
|
<dd><p><var>list</var> is a comma separated list of <code>aprofile</code> and
|
|
<code>rmprofile</code> to build multilibs for A or R and M architecture
|
|
profiles respectively. Note that, due to some limitation of the current
|
|
multilib framework, using the combined <code>aprofile,rmprofile</code>
|
|
multilibs selects in some cases a less optimal multilib than when using
|
|
the multilib profile for the architecture targetted. The special value
|
|
<code>default</code> is also accepted and is equivalent to omitting the
|
|
option, i.e., only the default run-time library will be enabled.
|
|
</p>
|
|
<p><var>list</var> may instead contain <code>@name</code>, to use the multilib
|
|
configuration Makefile fragment <samp>name</samp> in <samp>gcc/config/arm</samp> in
|
|
the source tree (it is part of the corresponding sources, after all).
|
|
It is recommended, but not required, that files used for this purpose to
|
|
be named starting with <samp>t-ml-</samp>, to make their intended purpose
|
|
self-evident, in line with GCC conventions. Such files enable custom,
|
|
user-chosen multilib lists to be configured. Whether multiple such
|
|
files can be used together depends on the contents of the supplied
|
|
files. See <samp>gcc/config/arm/t-multilib</samp> and its supplementary
|
|
<samp>gcc/config/arm/t-*profile</samp> files for an example of what such
|
|
Makefile fragments might look like for this version of GCC. The macros
|
|
expected to be defined in these fragments are not stable across GCC
|
|
releases, so make sure they define the <code>MULTILIB</code>-related macros
|
|
expected by the version of GCC you are building.
|
|
See “Target Makefile Fragments” in the internals manual.
|
|
</p>
|
|
<p>The table below gives the combination of ISAs, architectures, FPUs and
|
|
floating-point ABIs for which multilibs are built for each predefined
|
|
profile. The union of these options is considered when specifying both
|
|
<code>aprofile</code> and <code>rmprofile</code>.
|
|
</p>
|
|
<table>
|
|
<tr><td width="15%">Option</td><td width="28%">aprofile</td><td width="30%">rmprofile</td></tr>
|
|
<tr><td width="15%">ISAs</td><td width="28%"><code>-marm</code> and <code>-mthumb</code></td><td width="30%"><code>-mthumb</code></td></tr>
|
|
<tr><td width="15%">Architectures<br><br><br><br><br><br></td><td width="28%">default architecture<br>
|
|
<code>-march=armv7-a</code><br>
|
|
<code>-march=armv7ve</code><br>
|
|
<code>-march=armv8-a</code><br><br><br></td><td width="30%">default architecture<br>
|
|
<code>-march=armv6s-m</code><br>
|
|
<code>-march=armv7-m</code><br>
|
|
<code>-march=armv7e-m</code><br>
|
|
<code>-march=armv8-m.base</code><br>
|
|
<code>-march=armv8-m.main</code><br>
|
|
<code>-march=armv7</code></td></tr>
|
|
<tr><td width="15%">FPUs<br><br><br><br><br></td><td width="28%">none<br>
|
|
<code>-mfpu=vfpv3-d16</code><br>
|
|
<code>-mfpu=neon</code><br>
|
|
<code>-mfpu=vfpv4-d16</code><br>
|
|
<code>-mfpu=neon-vfpv4</code><br>
|
|
<code>-mfpu=neon-fp-armv8</code></td><td width="30%">none<br>
|
|
<code>-mfpu=vfpv3-d16</code><br>
|
|
<code>-mfpu=fpv4-sp-d16</code><br>
|
|
<code>-mfpu=fpv5-sp-d16</code><br>
|
|
<code>-mfpu=fpv5-d16</code><br></td></tr>
|
|
<tr><td width="15%">floating-point ABIs<br><br></td><td width="28%"><code>-mfloat-abi=soft</code><br>
|
|
<code>-mfloat-abi=softfp</code><br>
|
|
<code>-mfloat-abi=hard</code></td><td width="30%"><code>-mfloat-abi=soft</code><br>
|
|
<code>-mfloat-abi=softfp</code><br>
|
|
<code>-mfloat-abi=hard</code></td></tr>
|
|
</table>
|
|
|
|
</dd>
|
|
<dt><code>riscv*-*-*</code></dt>
|
|
<dd><p><var>list</var> is a single ABI name. The target architecture must be either
|
|
<code>rv32gc</code> or <code>rv64gc</code>. This will build a single multilib for the
|
|
specified architecture and ABI pair. If <code>--with-multilib-list</code> is not
|
|
given, then a default set of multilibs is selected based on the value of
|
|
<samp>--target</samp>. This is usually a large set of multilibs.
|
|
</p>
|
|
</dd>
|
|
<dt><code>sh*-*-*</code></dt>
|
|
<dd><p><var>list</var> is a comma separated list of CPU names. These must be of the
|
|
form <code>sh*</code> or <code>m*</code> (in which case they match the compiler option
|
|
for that processor). The list should not contain any endian options -
|
|
these are handled by <samp>--with-endian</samp>.
|
|
</p>
|
|
<p>If <var>list</var> is empty, then there will be no multilibs for extra
|
|
processors. The multilib for the secondary endian remains enabled.
|
|
</p>
|
|
<p>As a special case, if an entry in the list starts with a <code>!</code>
|
|
(exclamation point), then it is added to the list of excluded multilibs.
|
|
Entries of this sort should be compatible with ‘<samp>MULTILIB_EXCLUDES</samp>’
|
|
(once the leading <code>!</code> has been stripped).
|
|
</p>
|
|
<p>If <samp>--with-multilib-list</samp> is not given, then a default set of
|
|
multilibs is selected based on the value of <samp>--target</samp>. This is
|
|
usually the complete set of libraries, but some targets imply a more
|
|
specialized subset.
|
|
</p>
|
|
<p>Example 1: to configure a compiler for SH4A only, but supporting both
|
|
endians, with little endian being the default:
|
|
</p><div class="smallexample">
|
|
<pre class="smallexample">--with-cpu=sh4a --with-endian=little,big --with-multilib-list=
|
|
</pre></div>
|
|
|
|
<p>Example 2: to configure a compiler for both SH4A and SH4AL-DSP, but with
|
|
only little endian SH4AL:
|
|
</p><div class="smallexample">
|
|
<pre class="smallexample">--with-cpu=sh4a --with-endian=little,big \
|
|
--with-multilib-list=sh4al,!mb/m4al
|
|
</pre></div>
|
|
|
|
</dd>
|
|
<dt><code>x86-64-*-linux*</code></dt>
|
|
<dd><p><var>list</var> is a comma separated list of <code>m32</code>, <code>m64</code> and
|
|
<code>mx32</code> to enable 32-bit, 64-bit and x32 run-time libraries,
|
|
respectively. If <var>list</var> is empty, then there will be no multilibs
|
|
and only the default run-time library will be enabled.
|
|
</p>
|
|
<p>If <samp>--with-multilib-list</samp> is not given, then only 32-bit and
|
|
64-bit run-time libraries will be enabled.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><code>--with-endian=<var>endians</var></code></dt>
|
|
<dd><p>Specify what endians to use.
|
|
Currently only implemented for sh*-*-*.
|
|
</p>
|
|
<p><var>endians</var> may be one of the following:
|
|
</p><dl compact="compact">
|
|
<dt><code>big</code></dt>
|
|
<dd><p>Use big endian exclusively.
|
|
</p></dd>
|
|
<dt><code>little</code></dt>
|
|
<dd><p>Use little endian exclusively.
|
|
</p></dd>
|
|
<dt><code>big,little</code></dt>
|
|
<dd><p>Use big endian by default. Provide a multilib for little endian.
|
|
</p></dd>
|
|
<dt><code>little,big</code></dt>
|
|
<dd><p>Use little endian by default. Provide a multilib for big endian.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><code>--enable-threads</code></dt>
|
|
<dd><p>Specify that the target
|
|
supports threads. This affects the Objective-C compiler and runtime
|
|
library, and exception handling for other languages like C++.
|
|
On some systems, this is the default.
|
|
</p>
|
|
<p>In general, the best (and, in many cases, the only known) threading
|
|
model available will be configured for use. Beware that on some
|
|
systems, GCC has not been taught what threading models are generally
|
|
available for the system. In this case, <samp>--enable-threads</samp> is an
|
|
alias for <samp>--enable-threads=single</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--disable-threads</code></dt>
|
|
<dd><p>Specify that threading support should be disabled for the system.
|
|
This is an alias for <samp>--enable-threads=single</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-threads=<var>lib</var></code></dt>
|
|
<dd><p>Specify that
|
|
<var>lib</var> is the thread support library. This affects the Objective-C
|
|
compiler and runtime library, and exception handling for other languages
|
|
like C++. The possibilities for <var>lib</var> are:
|
|
</p>
|
|
<dl compact="compact">
|
|
<dt><code>aix</code></dt>
|
|
<dd><p>AIX thread support.
|
|
</p></dd>
|
|
<dt><code>dce</code></dt>
|
|
<dd><p>DCE thread support.
|
|
</p></dd>
|
|
<dt><code>lynx</code></dt>
|
|
<dd><p>LynxOS thread support.
|
|
</p></dd>
|
|
<dt><code>mipssde</code></dt>
|
|
<dd><p>MIPS SDE thread support.
|
|
</p></dd>
|
|
<dt><code>no</code></dt>
|
|
<dd><p>This is an alias for ‘<samp>single</samp>’.
|
|
</p></dd>
|
|
<dt><code>posix</code></dt>
|
|
<dd><p>Generic POSIX/Unix98 thread support.
|
|
</p></dd>
|
|
<dt><code>rtems</code></dt>
|
|
<dd><p>RTEMS thread support.
|
|
</p></dd>
|
|
<dt><code>single</code></dt>
|
|
<dd><p>Disable thread support, should work for all platforms.
|
|
</p></dd>
|
|
<dt><code>tpf</code></dt>
|
|
<dd><p>TPF thread support.
|
|
</p></dd>
|
|
<dt><code>vxworks</code></dt>
|
|
<dd><p>VxWorks thread support.
|
|
</p></dd>
|
|
<dt><code>win32</code></dt>
|
|
<dd><p>Microsoft Win32 API thread support.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
</dd>
|
|
<dt><code>--enable-tls</code></dt>
|
|
<dd><p>Specify that the target supports TLS (Thread Local Storage). Usually
|
|
configure can correctly determine if TLS is supported. In cases where
|
|
it guesses incorrectly, TLS can be explicitly enabled or disabled with
|
|
<samp>--enable-tls</samp> or <samp>--disable-tls</samp>. This can happen if
|
|
the assembler supports TLS but the C library does not, or if the
|
|
assumptions made by the configure test are incorrect.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--disable-tls</code></dt>
|
|
<dd><p>Specify that the target does not support TLS.
|
|
This is an alias for <samp>--enable-tls=no</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-cpu=<var>cpu</var></code></dt>
|
|
<dt><code>--with-cpu-32=<var>cpu</var></code></dt>
|
|
<dt><code>--with-cpu-64=<var>cpu</var></code></dt>
|
|
<dd><p>Specify which cpu variant the compiler should generate code for by default.
|
|
<var>cpu</var> will be used as the default value of the <samp>-mcpu=</samp> switch.
|
|
This option is only supported on some targets, including ARC, ARM, i386, M68k,
|
|
PowerPC, and SPARC. It is mandatory for ARC. The <samp>--with-cpu-32</samp> and
|
|
<samp>--with-cpu-64</samp> options specify separate default CPUs for
|
|
32-bit and 64-bit modes; these options are only supported for i386,
|
|
x86-64, PowerPC, and SPARC.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-schedule=<var>cpu</var></code></dt>
|
|
<dt><code>--with-arch=<var>cpu</var></code></dt>
|
|
<dt><code>--with-arch-32=<var>cpu</var></code></dt>
|
|
<dt><code>--with-arch-64=<var>cpu</var></code></dt>
|
|
<dt><code>--with-tune=<var>cpu</var></code></dt>
|
|
<dt><code>--with-tune-32=<var>cpu</var></code></dt>
|
|
<dt><code>--with-tune-64=<var>cpu</var></code></dt>
|
|
<dt><code>--with-abi=<var>abi</var></code></dt>
|
|
<dt><code>--with-fpu=<var>type</var></code></dt>
|
|
<dt><code>--with-float=<var>type</var></code></dt>
|
|
<dd><p>These configure options provide default values for the <samp>-mschedule=</samp>,
|
|
<samp>-march=</samp>, <samp>-mtune=</samp>, <samp>-mabi=</samp>, and <samp>-mfpu=</samp>
|
|
options and for <samp>-mhard-float</samp> or <samp>-msoft-float</samp>. As with
|
|
<samp>--with-cpu</samp>, which switches will be accepted and acceptable values
|
|
of the arguments depend on the target.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-mode=<var>mode</var></code></dt>
|
|
<dd><p>Specify if the compiler should default to <samp>-marm</samp> or <samp>-mthumb</samp>.
|
|
This option is only supported on ARM targets.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-stack-offset=<var>num</var></code></dt>
|
|
<dd><p>This option sets the default for the -mstack-offset=<var>num</var> option,
|
|
and will thus generally also control the setting of this option for
|
|
libraries. This option is only supported on Epiphany targets.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-fpmath=<var>isa</var></code></dt>
|
|
<dd><p>This options sets <samp>-mfpmath=sse</samp> by default and specifies the default
|
|
ISA for floating-point arithmetics. You can select either ‘<samp>sse</samp>’ which
|
|
enables <samp>-msse2</samp> or ‘<samp>avx</samp>’ which enables <samp>-mavx</samp> by default.
|
|
This option is only supported on i386 and x86-64 targets.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-fp-32=<var>mode</var></code></dt>
|
|
<dd><p>On MIPS targets, set the default value for the <samp>-mfp</samp> option when using
|
|
the o32 ABI. The possibilities for <var>mode</var> are:
|
|
</p><dl compact="compact">
|
|
<dt><code>32</code></dt>
|
|
<dd><p>Use the o32 FP32 ABI extension, as with the <samp>-mfp32</samp> command-line
|
|
option.
|
|
</p></dd>
|
|
<dt><code>xx</code></dt>
|
|
<dd><p>Use the o32 FPXX ABI extension, as with the <samp>-mfpxx</samp> command-line
|
|
option.
|
|
</p></dd>
|
|
<dt><code>64</code></dt>
|
|
<dd><p>Use the o32 FP64 ABI extension, as with the <samp>-mfp64</samp> command-line
|
|
option.
|
|
</p></dd>
|
|
</dl>
|
|
<p>In the absence of this configuration option the default is to use the o32
|
|
FP32 ABI extension.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-odd-spreg-32</code></dt>
|
|
<dd><p>On MIPS targets, set the <samp>-modd-spreg</samp> option by default when using
|
|
the o32 ABI.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--without-odd-spreg-32</code></dt>
|
|
<dd><p>On MIPS targets, set the <samp>-mno-odd-spreg</samp> option by default when using
|
|
the o32 ABI. This is normally used in conjunction with
|
|
<samp>--with-fp-32=64</samp> in order to target the o32 FP64A ABI extension.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-nan=<var>encoding</var></code></dt>
|
|
<dd><p>On MIPS targets, set the default encoding convention to use for the
|
|
special not-a-number (NaN) IEEE 754 floating-point data. The
|
|
possibilities for <var>encoding</var> are:
|
|
</p><dl compact="compact">
|
|
<dt><code>legacy</code></dt>
|
|
<dd><p>Use the legacy encoding, as with the <samp>-mnan=legacy</samp> command-line
|
|
option.
|
|
</p></dd>
|
|
<dt><code>2008</code></dt>
|
|
<dd><p>Use the 754-2008 encoding, as with the <samp>-mnan=2008</samp> command-line
|
|
option.
|
|
</p></dd>
|
|
</dl>
|
|
<p>To use this configuration option you must have an assembler version
|
|
installed that supports the <samp>-mnan=</samp> command-line option too.
|
|
In the absence of this configuration option the default convention is
|
|
the legacy encoding, as when neither of the <samp>-mnan=2008</samp> and
|
|
<samp>-mnan=legacy</samp> command-line options has been used.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-divide=<var>type</var></code></dt>
|
|
<dd><p>Specify how the compiler should generate code for checking for
|
|
division by zero. This option is only supported on the MIPS target.
|
|
The possibilities for <var>type</var> are:
|
|
</p><dl compact="compact">
|
|
<dt><code>traps</code></dt>
|
|
<dd><p>Division by zero checks use conditional traps (this is the default on
|
|
systems that support conditional traps).
|
|
</p></dd>
|
|
<dt><code>breaks</code></dt>
|
|
<dd><p>Division by zero checks use the break instruction.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
|
|
</dd>
|
|
<dt><code>--with-llsc</code></dt>
|
|
<dd><p>On MIPS targets, make <samp>-mllsc</samp> the default when no
|
|
<samp>-mno-llsc</samp> option is passed. This is the default for
|
|
Linux-based targets, as the kernel will emulate them if the ISA does
|
|
not provide them.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--without-llsc</code></dt>
|
|
<dd><p>On MIPS targets, make <samp>-mno-llsc</samp> the default when no
|
|
<samp>-mllsc</samp> option is passed.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-synci</code></dt>
|
|
<dd><p>On MIPS targets, make <samp>-msynci</samp> the default when no
|
|
<samp>-mno-synci</samp> option is passed.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--without-synci</code></dt>
|
|
<dd><p>On MIPS targets, make <samp>-mno-synci</samp> the default when no
|
|
<samp>-msynci</samp> option is passed. This is the default.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-lxc1-sxc1</code></dt>
|
|
<dd><p>On MIPS targets, make <samp>-mlxc1-sxc1</samp> the default when no
|
|
<samp>-mno-lxc1-sxc1</samp> option is passed. This is the default.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--without-lxc1-sxc1</code></dt>
|
|
<dd><p>On MIPS targets, make <samp>-mno-lxc1-sxc1</samp> the default when no
|
|
<samp>-mlxc1-sxc1</samp> option is passed. The indexed load/store
|
|
instructions are not directly a problem but can lead to unexpected
|
|
behaviour when deployed in an application intended for a 32-bit address
|
|
space but run on a 64-bit processor. The issue is seen because all
|
|
known MIPS 64-bit Linux kernels execute o32 and n32 applications
|
|
with 64-bit addressing enabled which affects the overflow behaviour
|
|
of the indexed addressing mode. GCC will assume that ordinary
|
|
32-bit arithmetic overflow behaviour is the same whether performed
|
|
as an <code>addu</code> instruction or as part of the address calculation
|
|
in <code>lwxc1</code> type instructions. This assumption holds true in a
|
|
pure 32-bit environment and can hold true in a 64-bit environment if
|
|
the address space is accurately set to be 32-bit for o32 and n32.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-madd4</code></dt>
|
|
<dd><p>On MIPS targets, make <samp>-mmadd4</samp> the default when no
|
|
<samp>-mno-madd4</samp> option is passed. This is the default.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--without-madd4</code></dt>
|
|
<dd><p>On MIPS targets, make <samp>-mno-madd4</samp> the default when no
|
|
<samp>-mmadd4</samp> option is passed. The <code>madd4</code> instruction
|
|
family can be problematic when targeting a combination of cores that
|
|
implement these instructions differently. There are two known cores
|
|
that implement these as fused operations instead of unfused (where
|
|
unfused is normally expected). Disabling these instructions is the
|
|
only way to ensure compatible code is generated; this will incur
|
|
a performance penalty.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-mips-plt</code></dt>
|
|
<dd><p>On MIPS targets, make use of copy relocations and PLTs.
|
|
These features are extensions to the traditional
|
|
SVR4-based MIPS ABIs and require support from GNU binutils
|
|
and the runtime C library.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-stack-clash-protection-guard-size=<var>size</var></code></dt>
|
|
<dd><p>On certain targets this option sets the default stack clash protection guard
|
|
size as a power of two in bytes. On AArch64 <var>size</var> is required to be either
|
|
12 (4KB) or 16 (64KB).
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-__cxa_atexit</code></dt>
|
|
<dd><p>Define if you want to use __cxa_atexit, rather than atexit, to
|
|
register C++ destructors for local statics and global objects.
|
|
This is essential for fully standards-compliant handling of
|
|
destructors, but requires __cxa_atexit in libc. This option is currently
|
|
only available on systems with GNU libc. When enabled, this will cause
|
|
<samp>-fuse-cxa-atexit</samp> to be passed by default.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-gnu-indirect-function</code></dt>
|
|
<dd><p>Define if you want to enable the <code>ifunc</code> attribute. This option is
|
|
currently only available on systems with GNU libc on certain targets.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-target-optspace</code></dt>
|
|
<dd><p>Specify that target
|
|
libraries should be optimized for code space instead of code speed.
|
|
This is the default for the m32r platform.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-cpp-install-dir=<var>dirname</var></code></dt>
|
|
<dd><p>Specify that the user visible <code>cpp</code> program should be installed
|
|
in <samp><var>prefix</var>/<var>dirname</var>/cpp</samp>, in addition to <var>bindir</var>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-comdat</code></dt>
|
|
<dd><p>Enable COMDAT group support. This is primarily used to override the
|
|
automatically detected value.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-initfini-array</code></dt>
|
|
<dd><p>Force the use of sections <code>.init_array</code> and <code>.fini_array</code>
|
|
(instead of <code>.init</code> and <code>.fini</code>) for constructors and
|
|
destructors. Option <samp>--disable-initfini-array</samp> has the
|
|
opposite effect. If neither option is specified, the configure script
|
|
will try to guess whether the <code>.init_array</code> and
|
|
<code>.fini_array</code> sections are supported and, if they are, use them.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-link-mutex</code></dt>
|
|
<dd><p>When building GCC, use a mutex to avoid linking the compilers for
|
|
multiple languages at the same time, to avoid thrashing on build
|
|
systems with limited free memory. The default is not to use such a mutex.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-maintainer-mode</code></dt>
|
|
<dd><p>The build rules that regenerate the Autoconf and Automake output files as
|
|
well as the GCC master message catalog <samp>gcc.pot</samp> are normally
|
|
disabled. This is because it can only be rebuilt if the complete source
|
|
tree is present. If you have changed the sources and want to rebuild the
|
|
catalog, configuring with <samp>--enable-maintainer-mode</samp> will enable
|
|
this. Note that you need a recent version of the <code>gettext</code> tools
|
|
to do so.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--disable-bootstrap</code></dt>
|
|
<dd><p>For a native build, the default configuration is to perform
|
|
a 3-stage bootstrap of the compiler when ‘<samp>make</samp>’ is invoked,
|
|
testing that GCC can compile itself correctly. If you want to disable
|
|
this process, you can configure with <samp>--disable-bootstrap</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-bootstrap</code></dt>
|
|
<dd><p>In special cases, you may want to perform a 3-stage build
|
|
even if the target and host triplets are different.
|
|
This is possible when the host can run code compiled for
|
|
the target (e.g. host is i686-linux, target is i486-linux).
|
|
Starting from GCC 4.2, to do this you have to configure explicitly
|
|
with <samp>--enable-bootstrap</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-generated-files-in-srcdir</code></dt>
|
|
<dd><p>Neither the .c and .h files that are generated from Bison and flex nor the
|
|
info manuals and man pages that are built from the .texi files are present
|
|
in the SVN development tree. When building GCC from that development tree,
|
|
or from one of our snapshots, those generated files are placed in your
|
|
build directory, which allows for the source to be in a readonly
|
|
directory.
|
|
</p>
|
|
<p>If you configure with <samp>--enable-generated-files-in-srcdir</samp> then those
|
|
generated files will go into the source directory. This is mainly intended
|
|
for generating release or prerelease tarballs of the GCC sources, since it
|
|
is not a requirement that the users of source releases to have flex, Bison,
|
|
or makeinfo.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-version-specific-runtime-libs</code></dt>
|
|
<dd><p>Specify
|
|
that runtime libraries should be installed in the compiler specific
|
|
subdirectory (<samp><var>libdir</var>/gcc</samp>) rather than the usual places. In
|
|
addition, ‘<samp>libstdc++</samp>’’s include files will be installed into
|
|
<samp><var>libdir</var></samp> unless you overruled it by using
|
|
<samp>--with-gxx-include-dir=<var>dirname</var></samp>. Using this option is
|
|
particularly useful if you intend to use several versions of GCC in
|
|
parallel. This is currently supported by ‘<samp>libgfortran</samp>’,
|
|
‘<samp>libstdc++</samp>’, and ‘<samp>libobjc</samp>’.
|
|
</p>
|
|
</dd>
|
|
<dt><code><a name="WithAixSoname"></a>--with-aix-soname=‘<samp>aix</samp>’, ‘<samp>svr4</samp>’ or ‘<samp>both</samp>’</code></dt>
|
|
<dd><p>Traditional AIX shared library versioning (versioned <code>Shared Object</code>
|
|
files as members of unversioned <code>Archive Library</code> files named
|
|
‘<samp>lib.a</samp>’) causes numerous headaches for package managers. However,
|
|
<code>Import Files</code> as members of <code>Archive Library</code> files allow for
|
|
<strong>filename-based versioning</strong> of shared libraries as seen on Linux/SVR4,
|
|
where this is called the "SONAME". But as they prevent static linking,
|
|
<code>Import Files</code> may be used with <code>Runtime Linking</code> only, where the
|
|
linker does search for ‘<samp>libNAME.so</samp>’ before ‘<samp>libNAME.a</samp>’ library
|
|
filenames with the ‘<samp>-lNAME</samp>’ linker flag.
|
|
</p>
|
|
<a name="AixLdCommand"></a><p>For detailed information please refer to the AIX
|
|
<a href="https://www.ibm.com/support/knowledgecenter/search/%22the%20ld%20command%2C%20also%20called%20the%20linkage%20editor%20or%20binder%22">ld
|
|
Command</a> reference.
|
|
</p>
|
|
<p>As long as shared library creation is enabled, upon:
|
|
</p><dl compact="compact">
|
|
<dt><code>--with-aix-soname=aix</code></dt>
|
|
<dt><code>--with-aix-soname=both</code></dt>
|
|
<dd><p>A (traditional AIX) <code>Shared Archive Library</code> file is created:
|
|
</p><ul>
|
|
<li> using the ‘<samp>libNAME.a</samp>’ filename scheme
|
|
</li><li> with the <code>Shared Object</code> file as archive member named
|
|
‘<samp>libNAME.so.V</samp>’ (except for ‘<samp>libgcc_s</samp>’, where the <code>Shared
|
|
Object</code> file is named ‘<samp>shr.o</samp>’ for backwards compatibility), which
|
|
<ul class="no-bullet">
|
|
<li>- is used for runtime loading from inside the ‘<samp>libNAME.a</samp>’ file
|
|
</li><li>- is used for dynamic loading via
|
|
<code>dlopen("libNAME.a(libNAME.so.V)", RTLD_MEMBER)</code>
|
|
</li><li>- is used for shared linking
|
|
</li><li>- is used for static linking, so no separate <code>Static Archive
|
|
Library</code> file is needed
|
|
</li></ul>
|
|
</li></ul>
|
|
</dd>
|
|
<dt><code>--with-aix-soname=both</code></dt>
|
|
<dt><code>--with-aix-soname=svr4</code></dt>
|
|
<dd><p>A (second) <code>Shared Archive Library</code> file is created:
|
|
</p><ul>
|
|
<li> using the ‘<samp>libNAME.so.V</samp>’ filename scheme
|
|
</li><li> with the <code>Shared Object</code> file as archive member named
|
|
‘<samp>shr.o</samp>’, which
|
|
<ul class="no-bullet">
|
|
<li>- is created with the <code>-G linker flag</code>
|
|
</li><li>- has the <code>F_LOADONLY</code> flag set
|
|
</li><li>- is used for runtime loading from inside the ‘<samp>libNAME.so.V</samp>’ file
|
|
</li><li>- is used for dynamic loading via <code>dlopen("libNAME.so.V(shr.o)",
|
|
RTLD_MEMBER)</code>
|
|
</li></ul>
|
|
</li><li> with the <code>Import File</code> as archive member named ‘<samp>shr.imp</samp>’,
|
|
which
|
|
<ul class="no-bullet">
|
|
<li>- refers to ‘<samp>libNAME.so.V(shr.o)</samp>’ as the "SONAME", to be recorded
|
|
in the <code>Loader Section</code> of subsequent binaries
|
|
</li><li>- indicates whether ‘<samp>libNAME.so.V(shr.o)</samp>’ is 32 or 64 bit
|
|
</li><li>- lists all the public symbols exported by ‘<samp>lib.so.V(shr.o)</samp>’,
|
|
eventually decorated with the <code>‘<samp>weak</samp>’ Keyword</code>
|
|
</li><li>- is necessary for shared linking against ‘<samp>lib.so.V(shr.o)</samp>’
|
|
</li></ul>
|
|
</li></ul>
|
|
<p>A symbolic link using the ‘<samp>libNAME.so</samp>’ filename scheme is created:
|
|
</p><ul>
|
|
<li> pointing to the ‘<samp>libNAME.so.V</samp>’ <code>Shared Archive Library</code> file
|
|
</li><li> to permit the <code>ld Command</code> to find ‘<samp>lib.so.V(shr.imp)</samp>’ via
|
|
the ‘<samp>-lNAME</samp>’ argument (requires <code>Runtime Linking</code> to be enabled)
|
|
</li><li> to permit dynamic loading of ‘<samp>lib.so.V(shr.o)</samp>’ without the need
|
|
to specify the version number via <code>dlopen("libNAME.so(shr.o)",
|
|
RTLD_MEMBER)</code>
|
|
</li></ul>
|
|
</dd>
|
|
</dl>
|
|
|
|
<p>As long as static library creation is enabled, upon:
|
|
</p><dl compact="compact">
|
|
<dt><code>--with-aix-soname=svr4</code></dt>
|
|
<dd><p>A <code>Static Archive Library</code> is created:
|
|
</p><ul>
|
|
<li> using the ‘<samp>libNAME.a</samp>’ filename scheme
|
|
</li><li> with all the <code>Static Object</code> files as archive members, which
|
|
<ul class="no-bullet">
|
|
<li>- are used for static linking
|
|
</li></ul>
|
|
</li></ul>
|
|
</dd>
|
|
</dl>
|
|
|
|
<p>While the aix-soname=‘<samp>svr4</samp>’ option does not create <code>Shared Object</code>
|
|
files as members of unversioned <code>Archive Library</code> files any more, package
|
|
managers still are responsible to
|
|
<a href="./specific.html#TransferAixShobj">transfer</a> <code>Shared Object</code> files
|
|
found as member of a previously installed unversioned <code>Archive Library</code>
|
|
file into the newly installed <code>Archive Library</code> file with the same
|
|
filename.
|
|
</p>
|
|
<p><em>WARNING:</em> Creating <code>Shared Object</code> files with <code>Runtime Linking</code>
|
|
enabled may bloat the TOC, eventually leading to <code>TOC overflow</code> errors,
|
|
requiring the use of either the <samp>-Wl,-bbigtoc</samp> linker flag (seen to
|
|
break with the <code>GDB</code> debugger) or some of the TOC-related compiler flags,
|
|
see “RS/6000 and PowerPC Options” in the main manual.
|
|
</p>
|
|
<p><samp>--with-aix-soname</samp> is currently supported by ‘<samp>libgcc_s</samp>’ only, so
|
|
this option is still experimental and not for normal use yet.
|
|
</p>
|
|
<p>Default is the traditional behavior <samp>--with-aix-soname=‘<samp>aix</samp>’</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-languages=<var>lang1</var>,<var>lang2</var>,…</code></dt>
|
|
<dd><p>Specify that only a particular subset of compilers and
|
|
their runtime libraries should be built. For a list of valid values for
|
|
<var>langN</var> you can issue the following command in the
|
|
<samp>gcc</samp> directory of your GCC source tree:<br>
|
|
</p><div class="smallexample">
|
|
<pre class="smallexample">grep ^language= */config-lang.in
|
|
</pre></div>
|
|
<p>Currently, you can use any of the following:
|
|
<code>all</code>, <code>default</code>, <code>ada</code>, <code>c</code>, <code>c++</code>, <code>d</code>,
|
|
<code>fortran</code>, <code>go</code>, <code>jit</code>, <code>lto</code>, <code>objc</code>, <code>obj-c++</code>.
|
|
Building the Ada compiler has special requirements, see below.
|
|
If you do not pass this flag, or specify the option <code>default</code>, then the
|
|
default languages available in the <samp>gcc</samp> sub-tree will be configured.
|
|
Ada, D, Go, Jit, and Objective-C++ are not default languages. LTO is not a
|
|
default language, but is built by default because <samp>--enable-lto</samp> is
|
|
enabled by default. The other languages are default languages. If
|
|
<code>all</code> is specified, then all available languages are built. An
|
|
exception is <code>jit</code> language, which requires
|
|
<samp>--enable-host-shared</samp> to be included with <code>all</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-stage1-languages=<var>lang1</var>,<var>lang2</var>,…</code></dt>
|
|
<dd><p>Specify that a particular subset of compilers and their runtime
|
|
libraries should be built with the system C compiler during stage 1 of
|
|
the bootstrap process, rather than only in later stages with the
|
|
bootstrapped C compiler. The list of valid values is the same as for
|
|
<samp>--enable-languages</samp>, and the option <code>all</code> will select all
|
|
of the languages enabled by <samp>--enable-languages</samp>. This option is
|
|
primarily useful for GCC development; for instance, when a development
|
|
version of the compiler cannot bootstrap due to compiler bugs, or when
|
|
one is debugging front ends other than the C front end. When this
|
|
option is used, one can then build the target libraries for the
|
|
specified languages with the stage-1 compiler by using <code>make
|
|
stage1-bubble all-target</code>, or run the testsuite on the stage-1 compiler
|
|
for the specified languages using <code>make stage1-start check-gcc</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--disable-libada</code></dt>
|
|
<dd><p>Specify that the run-time libraries and tools used by GNAT should not
|
|
be built. This can be useful for debugging, or for compatibility with
|
|
previous Ada build procedures, when it was required to explicitly
|
|
do a ‘<samp>make -C gcc gnatlib_and_tools</samp>’.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--disable-libsanitizer</code></dt>
|
|
<dd><p>Specify that the run-time libraries for the various sanitizers should
|
|
not be built.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--disable-libssp</code></dt>
|
|
<dd><p>Specify that the run-time libraries for stack smashing protection
|
|
should not be built or linked against. On many targets library support
|
|
is provided by the C library instead.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--disable-libquadmath</code></dt>
|
|
<dd><p>Specify that the GCC quad-precision math library should not be built.
|
|
On some systems, the library is required to be linkable when building
|
|
the Fortran front end, unless <samp>--disable-libquadmath-support</samp>
|
|
is used.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--disable-libquadmath-support</code></dt>
|
|
<dd><p>Specify that the Fortran front end and <code>libgfortran</code> do not add
|
|
support for <code>libquadmath</code> on systems supporting it.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--disable-libgomp</code></dt>
|
|
<dd><p>Specify that the GNU Offloading and Multi Processing Runtime Library
|
|
should not be built.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--disable-libvtv</code></dt>
|
|
<dd><p>Specify that the run-time libraries used by vtable verification
|
|
should not be built.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-dwarf2</code></dt>
|
|
<dd><p>Specify that the compiler should
|
|
use DWARF 2 debugging information as the default.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-advance-toolchain=<var>at</var></code></dt>
|
|
<dd><p>On 64-bit PowerPC Linux systems, configure the compiler to use the
|
|
header files, library files, and the dynamic linker from the Advance
|
|
Toolchain release <var>at</var> instead of the default versions that are
|
|
provided by the Linux distribution. In general, this option is
|
|
intended for the developers of GCC, and it is not intended for general
|
|
use.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-targets=all</code></dt>
|
|
<dt><code>--enable-targets=<var>target_list</var></code></dt>
|
|
<dd><p>Some GCC targets, e.g. powerpc64-linux, build bi-arch compilers.
|
|
These are compilers that are able to generate either 64-bit or 32-bit
|
|
code. Typically, the corresponding 32-bit target, e.g.
|
|
powerpc-linux for powerpc64-linux, only generates 32-bit code. This
|
|
option enables the 32-bit target to be a bi-arch compiler, which is
|
|
useful when you want a bi-arch compiler that defaults to 32-bit, and
|
|
you are building a bi-arch or multi-arch binutils in a combined tree.
|
|
On mips-linux, this will build a tri-arch compiler (ABI o32/n32/64),
|
|
defaulted to o32.
|
|
Currently, this option only affects sparc-linux, powerpc-linux, x86-linux,
|
|
mips-linux and s390-linux.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-default-pie</code></dt>
|
|
<dd><p>Turn on <samp>-fPIE</samp> and <samp>-pie</samp> by default.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-secureplt</code></dt>
|
|
<dd><p>This option enables <samp>-msecure-plt</samp> by default for powerpc-linux.
|
|
See “RS/6000 and PowerPC Options” in the main manual
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-default-ssp</code></dt>
|
|
<dd><p>Turn on <samp>-fstack-protector-strong</samp> by default.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-cld</code></dt>
|
|
<dd><p>This option enables <samp>-mcld</samp> by default for 32-bit x86 targets.
|
|
See “i386 and x86-64 Options” in the main manual
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-large-address-aware</code></dt>
|
|
<dd><p>The <samp>--enable-large-address-aware</samp> option arranges for MinGW
|
|
executables to be linked using the <samp>--large-address-aware</samp>
|
|
option, that enables the use of more than 2GB of memory. If GCC is
|
|
configured with this option, its effects can be reversed by passing the
|
|
<samp>-Wl,--disable-large-address-aware</samp> option to the so-configured
|
|
compiler driver.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-win32-registry</code></dt>
|
|
<dt><code>--enable-win32-registry=<var>key</var></code></dt>
|
|
<dt><code>--disable-win32-registry</code></dt>
|
|
<dd><p>The <samp>--enable-win32-registry</samp> option enables Microsoft Windows-hosted GCC
|
|
to look up installations paths in the registry using the following key:
|
|
</p>
|
|
<div class="smallexample">
|
|
<pre class="smallexample"><code>HKEY_LOCAL_MACHINE\SOFTWARE\Free Software Foundation\<var>key</var></code>
|
|
</pre></div>
|
|
|
|
<p><var>key</var> defaults to GCC version number, and can be overridden by the
|
|
<samp>--enable-win32-registry=<var>key</var></samp> option. Vendors and distributors
|
|
who use custom installers are encouraged to provide a different key,
|
|
perhaps one comprised of vendor name and GCC version number, to
|
|
avoid conflict with existing installations. This feature is enabled
|
|
by default, and can be disabled by <samp>--disable-win32-registry</samp>
|
|
option. This option has no effect on the other hosts.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--nfp</code></dt>
|
|
<dd><p>Specify that the machine does not have a floating point unit. This
|
|
option only applies to ‘<samp>m68k-sun-sunos<var>n</var></samp>’. On any other
|
|
system, <samp>--nfp</samp> has no effect.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-werror</code></dt>
|
|
<dt><code>--disable-werror</code></dt>
|
|
<dt><code>--enable-werror=yes</code></dt>
|
|
<dt><code>--enable-werror=no</code></dt>
|
|
<dd><p>When you specify this option, it controls whether certain files in the
|
|
compiler are built with <samp>-Werror</samp> in bootstrap stage2 and later.
|
|
If you don’t specify it, <samp>-Werror</samp> is turned on for the main
|
|
development trunk. However it defaults to off for release branches and
|
|
final releases. The specific files which get <samp>-Werror</samp> are
|
|
controlled by the Makefiles.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-checking</code></dt>
|
|
<dt><code>--enable-checking=<var>list</var></code></dt>
|
|
<dd><p>When you specify this option, the compiler is built to perform internal
|
|
consistency checks of the requested complexity. This does not change the
|
|
generated code, but adds error checking within the compiler. This will
|
|
slow down the compiler and may only work properly if you are building
|
|
the compiler with GCC. This is ‘<samp>yes,extra</samp>’ by default when building
|
|
from SVN or snapshots, but ‘<samp>release</samp>’ for releases. The default
|
|
for building the stage1 compiler is ‘<samp>yes</samp>’. More control
|
|
over the checks may be had by specifying <var>list</var>. The categories of
|
|
checks available are ‘<samp>yes</samp>’ (most common checks
|
|
‘<samp>assert,misc,tree,gc,rtlflag,runtime</samp>’), ‘<samp>no</samp>’ (no checks at
|
|
all), ‘<samp>all</samp>’ (all but ‘<samp>valgrind</samp>’), ‘<samp>release</samp>’ (cheapest
|
|
checks ‘<samp>assert,runtime</samp>’) or ‘<samp>none</samp>’ (same as ‘<samp>no</samp>’).
|
|
Individual checks can be enabled with these flags ‘<samp>assert</samp>’,
|
|
‘<samp>df</samp>’, ‘<samp>fold</samp>’, ‘<samp>gc</samp>’, ‘<samp>gcac</samp>’, ‘<samp>misc</samp>’, ‘<samp>rtl</samp>’,
|
|
‘<samp>rtlflag</samp>’, ‘<samp>runtime</samp>’, ‘<samp>tree</samp>’, ‘<samp>extra</samp>’ and ‘<samp>valgrind</samp>’.
|
|
‘<samp>extra</samp>’ adds for ‘<samp>misc</samp>’ checking extra checks that might affect
|
|
code generation and should therefore not differ between stage1 and later
|
|
stages.
|
|
</p>
|
|
<p>The ‘<samp>valgrind</samp>’ check requires the external <code>valgrind</code>
|
|
simulator, available from <a href="http://valgrind.org/">http://valgrind.org/</a>. The
|
|
‘<samp>df</samp>’, ‘<samp>rtl</samp>’, ‘<samp>gcac</samp>’ and ‘<samp>valgrind</samp>’ checks are very expensive.
|
|
To disable all checking, ‘<samp>--disable-checking</samp>’ or
|
|
‘<samp>--enable-checking=none</samp>’ must be explicitly requested. Disabling
|
|
assertions will make the compiler and runtime slightly faster but
|
|
increase the risk of undetected internal errors causing wrong code to be
|
|
generated.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--disable-stage1-checking</code></dt>
|
|
<dt><code>--enable-stage1-checking</code></dt>
|
|
<dt><code>--enable-stage1-checking=<var>list</var></code></dt>
|
|
<dd><p>If no <samp>--enable-checking</samp> option is specified the stage1
|
|
compiler will be built with ‘<samp>yes</samp>’ checking enabled, otherwise
|
|
the stage1 checking flags are the same as specified by
|
|
<samp>--enable-checking</samp>. To build the stage1 compiler with
|
|
different checking options use <samp>--enable-stage1-checking</samp>.
|
|
The list of checking options is the same as for <samp>--enable-checking</samp>.
|
|
If your system is too slow or too small to bootstrap a released compiler
|
|
with checking for stage1 enabled, you can use ‘<samp>--disable-stage1-checking</samp>’
|
|
to disable checking for the stage1 compiler.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-coverage</code></dt>
|
|
<dt><code>--enable-coverage=<var>level</var></code></dt>
|
|
<dd><p>With this option, the compiler is built to collect self coverage
|
|
information, every time it is run. This is for internal development
|
|
purposes, and only works when the compiler is being built with gcc. The
|
|
<var>level</var> argument controls whether the compiler is built optimized or
|
|
not, values are ‘<samp>opt</samp>’ and ‘<samp>noopt</samp>’. For coverage analysis you
|
|
want to disable optimization, for performance analysis you want to
|
|
enable optimization. When coverage is enabled, the default level is
|
|
without optimization.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-gather-detailed-mem-stats</code></dt>
|
|
<dd><p>When this option is specified more detailed information on memory
|
|
allocation is gathered. This information is printed when using
|
|
<samp>-fmem-report</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-valgrind-annotations</code></dt>
|
|
<dd><p>Mark selected memory related operations in the compiler when run under
|
|
valgrind to suppress false positives.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-nls</code></dt>
|
|
<dt><code>--disable-nls</code></dt>
|
|
<dd><p>The <samp>--enable-nls</samp> option enables Native Language Support (NLS),
|
|
which lets GCC output diagnostics in languages other than American
|
|
English. Native Language Support is enabled by default if not doing a
|
|
canadian cross build. The <samp>--disable-nls</samp> option disables NLS.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-included-gettext</code></dt>
|
|
<dd><p>If NLS is enabled, the <samp>--with-included-gettext</samp> option causes the build
|
|
procedure to prefer its copy of GNU <code>gettext</code>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-catgets</code></dt>
|
|
<dd><p>If NLS is enabled, and if the host lacks <code>gettext</code> but has the
|
|
inferior <code>catgets</code> interface, the GCC build procedure normally
|
|
ignores <code>catgets</code> and instead uses GCC’s copy of the GNU
|
|
<code>gettext</code> library. The <samp>--with-catgets</samp> option causes the
|
|
build procedure to use the host’s <code>catgets</code> in this situation.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-libiconv-prefix=<var>dir</var></code></dt>
|
|
<dd><p>Search for libiconv header files in <samp><var>dir</var>/include</samp> and
|
|
libiconv library files in <samp><var>dir</var>/lib</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-obsolete</code></dt>
|
|
<dd><p>Enable configuration for an obsoleted system. If you attempt to
|
|
configure GCC for a system (build, host, or target) which has been
|
|
obsoleted, and you do not specify this flag, configure will halt with an
|
|
error message.
|
|
</p>
|
|
<p>All support for systems which have been obsoleted in one release of GCC
|
|
is removed entirely in the next major release, unless someone steps
|
|
forward to maintain the port.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-decimal-float</code></dt>
|
|
<dt><code>--enable-decimal-float=yes</code></dt>
|
|
<dt><code>--enable-decimal-float=no</code></dt>
|
|
<dt><code>--enable-decimal-float=bid</code></dt>
|
|
<dt><code>--enable-decimal-float=dpd</code></dt>
|
|
<dt><code>--disable-decimal-float</code></dt>
|
|
<dd><p>Enable (or disable) support for the C decimal floating point extension
|
|
that is in the IEEE 754-2008 standard. This is enabled by default only
|
|
on PowerPC, i386, and x86_64 GNU/Linux systems. Other systems may also
|
|
support it, but require the user to specifically enable it. You can
|
|
optionally control which decimal floating point format is used (either
|
|
‘<samp>bid</samp>’ or ‘<samp>dpd</samp>’). The ‘<samp>bid</samp>’ (binary integer decimal)
|
|
format is default on i386 and x86_64 systems, and the ‘<samp>dpd</samp>’
|
|
(densely packed decimal) format is default on PowerPC systems.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-fixed-point</code></dt>
|
|
<dt><code>--disable-fixed-point</code></dt>
|
|
<dd><p>Enable (or disable) support for C fixed-point arithmetic.
|
|
This option is enabled by default for some targets (such as MIPS) which
|
|
have hardware-support for fixed-point operations. On other targets, you
|
|
may enable this option manually.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-long-double-128</code></dt>
|
|
<dd><p>Specify if <code>long double</code> type should be 128-bit by default on selected
|
|
GNU/Linux architectures. If using <code>--without-long-double-128</code>,
|
|
<code>long double</code> will be by default 64-bit, the same as <code>double</code> type.
|
|
When neither of these configure options are used, the default will be
|
|
128-bit <code>long double</code> when built against GNU C Library 2.4 and later,
|
|
64-bit <code>long double</code> otherwise.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-long-double-format=ibm</code></dt>
|
|
<dt><code>--with-long-double-format=ieee</code></dt>
|
|
<dd><p>Specify whether <code>long double</code> uses the IBM extended double format
|
|
or the IEEE 128-bit floating point format on PowerPC Linux systems.
|
|
This configuration switch will only work on little endian PowerPC
|
|
Linux systems and on big endian 64-bit systems where the default cpu
|
|
is at least power7 (i.e. <samp>--with-cpu=power7</samp>,
|
|
<samp>--with-cpu=power8</samp>, or <samp>--with-cpu=power9</samp> is used).
|
|
</p>
|
|
<p>If you use the <samp>--with-long-double-64</samp> configuration option,
|
|
the <samp>--with-long-double-format=ibm</samp> and
|
|
<samp>--with-long-double-format=ieee</samp> options are ignored.
|
|
</p>
|
|
<p>The default <code>long double</code> format is to use IBM extended double.
|
|
Until all of the libraries are converted to use IEEE 128-bit floating
|
|
point, it is not recommended to use
|
|
<samp>--with-long-double-format=ieee</samp>.
|
|
</p>
|
|
<p>On little endian PowerPC Linux systems, if you explicitly set the
|
|
<code>long double</code> type, it will build multilibs to allow you to
|
|
select either <code>long double</code> format, unless you disable multilibs
|
|
with the <code>--disable-multilib</code> option. At present,
|
|
<code>long double</code> multilibs are not built on big endian PowerPC Linux
|
|
systems. If you are building multilibs, you will need to configure
|
|
the compiler using the <samp>--with-system-zlib</samp> option.
|
|
</p>
|
|
<p>If you do not set the <code>long double</code> type explicitly, no multilibs
|
|
will be generated.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-fdpic</code></dt>
|
|
<dd><p>On SH Linux systems, generate ELF FDPIC code.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-gmp=<var>pathname</var></code></dt>
|
|
<dt><code>--with-gmp-include=<var>pathname</var></code></dt>
|
|
<dt><code>--with-gmp-lib=<var>pathname</var></code></dt>
|
|
<dt><code>--with-mpfr=<var>pathname</var></code></dt>
|
|
<dt><code>--with-mpfr-include=<var>pathname</var></code></dt>
|
|
<dt><code>--with-mpfr-lib=<var>pathname</var></code></dt>
|
|
<dt><code>--with-mpc=<var>pathname</var></code></dt>
|
|
<dt><code>--with-mpc-include=<var>pathname</var></code></dt>
|
|
<dt><code>--with-mpc-lib=<var>pathname</var></code></dt>
|
|
<dd><p>If you want to build GCC but do not have the GMP library, the MPFR
|
|
library and/or the MPC library installed in a standard location and
|
|
do not have their sources present in the GCC source tree then you
|
|
can explicitly specify the directory where they are installed
|
|
(‘<samp>--with-gmp=<var>gmpinstalldir</var></samp>’,
|
|
‘<samp>--with-mpfr=<var>mpfrinstalldir</var></samp>’,
|
|
‘<samp>--with-mpc=<var>mpcinstalldir</var></samp>’). The
|
|
<samp>--with-gmp=<var>gmpinstalldir</var></samp> option is shorthand for
|
|
<samp>--with-gmp-lib=<var>gmpinstalldir</var>/lib</samp> and
|
|
<samp>--with-gmp-include=<var>gmpinstalldir</var>/include</samp>. Likewise the
|
|
<samp>--with-mpfr=<var>mpfrinstalldir</var></samp> option is shorthand for
|
|
<samp>--with-mpfr-lib=<var>mpfrinstalldir</var>/lib</samp> and
|
|
<samp>--with-mpfr-include=<var>mpfrinstalldir</var>/include</samp>, also the
|
|
<samp>--with-mpc=<var>mpcinstalldir</var></samp> option is shorthand for
|
|
<samp>--with-mpc-lib=<var>mpcinstalldir</var>/lib</samp> and
|
|
<samp>--with-mpc-include=<var>mpcinstalldir</var>/include</samp>. If these
|
|
shorthand assumptions are not correct, you can use the explicit
|
|
include and lib options directly. You might also need to ensure the
|
|
shared libraries can be found by the dynamic linker when building and
|
|
using GCC, for example by setting the runtime shared library path
|
|
variable (<code>LD_LIBRARY_PATH</code> on GNU/Linux and Solaris systems).
|
|
</p>
|
|
<p>These flags are applicable to the host platform only. When building
|
|
a cross compiler, they will not be used to configure target libraries.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-isl=<var>pathname</var></code></dt>
|
|
<dt><code>--with-isl-include=<var>pathname</var></code></dt>
|
|
<dt><code>--with-isl-lib=<var>pathname</var></code></dt>
|
|
<dd><p>If you do not have the isl library installed in a standard location and you
|
|
want to build GCC, you can explicitly specify the directory where it is
|
|
installed (‘<samp>--with-isl=<var>islinstalldir</var></samp>’). The
|
|
<samp>--with-isl=<var>islinstalldir</var></samp> option is shorthand for
|
|
<samp>--with-isl-lib=<var>islinstalldir</var>/lib</samp> and
|
|
<samp>--with-isl-include=<var>islinstalldir</var>/include</samp>. If this
|
|
shorthand assumption is not correct, you can use the explicit
|
|
include and lib options directly.
|
|
</p>
|
|
<p>These flags are applicable to the host platform only. When building
|
|
a cross compiler, they will not be used to configure target libraries.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-stage1-ldflags=<var>flags</var></code></dt>
|
|
<dd><p>This option may be used to set linker flags to be used when linking
|
|
stage 1 of GCC. These are also used when linking GCC if configured with
|
|
<samp>--disable-bootstrap</samp>. If <samp>--with-stage1-libs</samp> is not set to a
|
|
value, then the default is ‘<samp>-static-libstdc++ -static-libgcc</samp>’, if
|
|
supported.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-stage1-libs=<var>libs</var></code></dt>
|
|
<dd><p>This option may be used to set libraries to be used when linking stage 1
|
|
of GCC. These are also used when linking GCC if configured with
|
|
<samp>--disable-bootstrap</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-boot-ldflags=<var>flags</var></code></dt>
|
|
<dd><p>This option may be used to set linker flags to be used when linking
|
|
stage 2 and later when bootstrapping GCC. If –with-boot-libs
|
|
is not is set to a value, then the default is
|
|
‘<samp>-static-libstdc++ -static-libgcc</samp>’.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-boot-libs=<var>libs</var></code></dt>
|
|
<dd><p>This option may be used to set libraries to be used when linking stage 2
|
|
and later when bootstrapping GCC.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-debug-prefix-map=<var>map</var></code></dt>
|
|
<dd><p>Convert source directory names using <samp>-fdebug-prefix-map</samp> when
|
|
building runtime libraries. ‘<samp><var>map</var></samp>’ is a space-separated
|
|
list of maps of the form ‘<samp><var>old</var>=<var>new</var></samp>’.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-linker-build-id</code></dt>
|
|
<dd><p>Tells GCC to pass <samp>--build-id</samp> option to the linker for all final
|
|
links (links performed without the <samp>-r</samp> or <samp>--relocatable</samp>
|
|
option), if the linker supports it. If you specify
|
|
<samp>--enable-linker-build-id</samp>, but your linker does not
|
|
support <samp>--build-id</samp> option, a warning is issued and the
|
|
<samp>--enable-linker-build-id</samp> option is ignored. The default is off.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-linker-hash-style=<var>choice</var></code></dt>
|
|
<dd><p>Tells GCC to pass <samp>--hash-style=<var>choice</var></samp> option to the
|
|
linker for all final links. <var>choice</var> can be one of
|
|
‘<samp>sysv</samp>’, ‘<samp>gnu</samp>’, and ‘<samp>both</samp>’ where ‘<samp>sysv</samp>’ is the default.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-gnu-unique-object</code></dt>
|
|
<dt><code>--disable-gnu-unique-object</code></dt>
|
|
<dd><p>Tells GCC to use the gnu_unique_object relocation for C++ template
|
|
static data members and inline function local statics. Enabled by
|
|
default for a toolchain with an assembler that accepts it and
|
|
GLIBC 2.11 or above, otherwise disabled.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-diagnostics-color=<var>choice</var></code></dt>
|
|
<dd><p>Tells GCC to use <var>choice</var> as the default for <samp>-fdiagnostics-color=</samp>
|
|
option (if not used explicitly on the command line). <var>choice</var>
|
|
can be one of ‘<samp>never</samp>’, ‘<samp>auto</samp>’, ‘<samp>always</samp>’, and ‘<samp>auto-if-env</samp>’
|
|
where ‘<samp>auto</samp>’ is the default. ‘<samp>auto-if-env</samp>’ means that
|
|
<samp>-fdiagnostics-color=auto</samp> will be the default if <code>GCC_COLORS</code>
|
|
is present and non-empty in the environment, and
|
|
<samp>-fdiagnostics-color=never</samp> otherwise.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-lto</code></dt>
|
|
<dt><code>--disable-lto</code></dt>
|
|
<dd><p>Enable support for link-time optimization (LTO). This is enabled by
|
|
default, and may be disabled using <samp>--disable-lto</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-linker-plugin-configure-flags=FLAGS</code></dt>
|
|
<dt><code>--enable-linker-plugin-flags=FLAGS</code></dt>
|
|
<dd><p>By default, linker plugins (such as the LTO plugin) are built for the
|
|
host system architecture. For the case that the linker has a
|
|
different (but run-time compatible) architecture, these flags can be
|
|
specified to build plugins that are compatible to the linker. For
|
|
example, if you are building GCC for a 64-bit x86_64
|
|
(‘<samp>x86_64-pc-linux-gnu</samp>’) host system, but have a 32-bit x86
|
|
GNU/Linux (‘<samp>i686-pc-linux-gnu</samp>’) linker executable (which is
|
|
executable on the former system), you can configure GCC as follows for
|
|
getting compatible linker plugins:
|
|
</p>
|
|
<div class="smallexample">
|
|
<pre class="smallexample">% <var>srcdir</var>/configure \
|
|
--host=x86_64-pc-linux-gnu \
|
|
--enable-linker-plugin-configure-flags=--host=i686-pc-linux-gnu \
|
|
--enable-linker-plugin-flags='CC=gcc\ -m32\ -Wl,-rpath,[...]/i686-pc-linux-gnu/lib'
|
|
</pre></div>
|
|
|
|
</dd>
|
|
<dt><code>--with-plugin-ld=<var>pathname</var></code></dt>
|
|
<dd><p>Enable an alternate linker to be used at link-time optimization (LTO)
|
|
link time when <samp>-fuse-linker-plugin</samp> is enabled.
|
|
This linker should have plugin support such as gold starting with
|
|
version 2.20 or GNU ld starting with version 2.21.
|
|
See <samp>-fuse-linker-plugin</samp> for details.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-canonical-system-headers</code></dt>
|
|
<dt><code>--disable-canonical-system-headers</code></dt>
|
|
<dd><p>Enable system header path canonicalization for <samp>libcpp</samp>. This can
|
|
produce shorter header file paths in diagnostics and dependency output
|
|
files, but these changed header paths may conflict with some compilation
|
|
environments. Enabled by default, and may be disabled using
|
|
<samp>--disable-canonical-system-headers</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-glibc-version=<var>major</var>.<var>minor</var></code></dt>
|
|
<dd><p>Tell GCC that when the GNU C Library (glibc) is used on the target it
|
|
will be version <var>major</var>.<var>minor</var> or later. Normally this can
|
|
be detected from the C library’s header files, but this option may be
|
|
needed when bootstrapping a cross toolchain without the header files
|
|
available for building the initial bootstrap compiler.
|
|
</p>
|
|
<p>If GCC is configured with some multilibs that use glibc and some that
|
|
do not, this option applies only to the multilibs that use glibc.
|
|
However, such configurations may not work well as not all the relevant
|
|
configuration in GCC is on a per-multilib basis.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-as-accelerator-for=<var>target</var></code></dt>
|
|
<dd><p>Build as offload target compiler. Specify offload host triple by <var>target</var>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-offload-targets=<var>target1</var>[=<var>path1</var>],…,<var>targetN</var>[=<var>pathN</var>]</code></dt>
|
|
<dd><p>Enable offloading to targets <var>target1</var>, …, <var>targetN</var>.
|
|
Offload compilers are expected to be already installed. Default search
|
|
path for them is <samp><var>exec-prefix</var></samp>, but it can be changed by
|
|
specifying paths <var>path1</var>, …, <var>pathN</var>.
|
|
</p>
|
|
<div class="smallexample">
|
|
<pre class="smallexample">% <var>srcdir</var>/configure \
|
|
--enable-offload-target=i686-unknown-linux-gnu=/path/to/i686/compiler,x86_64-pc-linux-gnu
|
|
</pre></div>
|
|
|
|
<p>If ‘<samp>hsa</samp>’ is specified as one of the targets, the compiler will be
|
|
built with support for HSA GPU accelerators. Because the same
|
|
compiler will emit the accelerator code, no path should be specified.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-hsa-runtime=<var>pathname</var></code></dt>
|
|
<dt><code>--with-hsa-runtime-include=<var>pathname</var></code></dt>
|
|
<dt><code>--with-hsa-runtime-lib=<var>pathname</var></code></dt>
|
|
<dd>
|
|
<p>If you configure GCC with HSA offloading but do not have the HSA
|
|
run-time library installed in a standard location then you can
|
|
explicitly specify the directory where they are installed. The
|
|
<samp>--with-hsa-runtime=<var>hsainstalldir</var></samp> option is a
|
|
shorthand for
|
|
<samp>--with-hsa-runtime-lib=<var>hsainstalldir</var>/lib</samp> and
|
|
<samp>--with-hsa-runtime-include=<var>hsainstalldir</var>/include</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--enable-cet</code></dt>
|
|
<dt><code>--disable-cet</code></dt>
|
|
<dd><p>Enable building target run-time libraries with control-flow
|
|
instrumentation, see <samp>-fcf-protection</samp> option. When
|
|
<code>--enable-cet</code> is specified target libraries are configured
|
|
to add <samp>-fcf-protection</samp> and, if needed, other target
|
|
specific options to a set of building options.
|
|
</p>
|
|
<p>The option is disabled by default. When <code>--enable-cet=auto</code>
|
|
is used, it is enabled on Linux/x86 if target binutils
|
|
supports <code>Intel CET</code> instructions and disabled otherwise.
|
|
In this case the target libraries are configured to get additional
|
|
<samp>-fcf-protection</samp> option.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-riscv-attribute=‘<samp>yes</samp>’, ‘<samp>no</samp>’ or ‘<samp>default</samp>’</code></dt>
|
|
<dd><p>Generate RISC-V attribute by default, in order to record extra build
|
|
information in object.
|
|
</p>
|
|
<p>The option is disabled by default. It is enabled on RISC-V/ELF (bare-metal)
|
|
target if target binutils supported.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<a name="Cross-Compiler-Specific-Options"></a>
|
|
<h4 class="subheading">Cross-Compiler-Specific Options</h4>
|
|
<p>The following options only apply to building cross compilers.
|
|
</p>
|
|
<dl compact="compact">
|
|
<dt><code>--with-sysroot</code></dt>
|
|
<dt><code>--with-sysroot=<var>dir</var></code></dt>
|
|
<dd><p>Tells GCC to consider <var>dir</var> as the root of a tree that contains
|
|
(a subset of) the root filesystem of the target operating system.
|
|
Target system headers, libraries and run-time object files will be
|
|
searched for in there. More specifically, this acts as if
|
|
<samp>--sysroot=<var>dir</var></samp> was added to the default options of the built
|
|
compiler. The specified directory is not copied into the
|
|
install tree, unlike the options <samp>--with-headers</samp> and
|
|
<samp>--with-libs</samp> that this option obsoletes. The default value,
|
|
in case <samp>--with-sysroot</samp> is not given an argument, is
|
|
<samp>${gcc_tooldir}/sys-root</samp>. If the specified directory is a
|
|
subdirectory of <samp>${exec_prefix}</samp>, then it will be found relative to
|
|
the GCC binaries if the installation tree is moved.
|
|
</p>
|
|
<p>This option affects the system root for the compiler used to build
|
|
target libraries (which runs on the build system) and the compiler newly
|
|
installed with <code>make install</code>; it does not affect the compiler which is
|
|
used to build GCC itself.
|
|
</p>
|
|
<p>If you specify the <samp>--with-native-system-header-dir=<var>dirname</var></samp>
|
|
option then the compiler will search that directory within <var>dirname</var> for
|
|
native system headers rather than the default <samp>/usr/include</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-build-sysroot</code></dt>
|
|
<dt><code>--with-build-sysroot=<var>dir</var></code></dt>
|
|
<dd><p>Tells GCC to consider <var>dir</var> as the system root (see
|
|
<samp>--with-sysroot</samp>) while building target libraries, instead of
|
|
the directory specified with <samp>--with-sysroot</samp>. This option is
|
|
only useful when you are already using <samp>--with-sysroot</samp>. You
|
|
can use <samp>--with-build-sysroot</samp> when you are configuring with
|
|
<samp>--prefix</samp> set to a directory that is different from the one in
|
|
which you are installing GCC and your target libraries.
|
|
</p>
|
|
<p>This option affects the system root for the compiler used to build
|
|
target libraries (which runs on the build system); it does not affect
|
|
the compiler which is used to build GCC itself.
|
|
</p>
|
|
<p>If you specify the <samp>--with-native-system-header-dir=<var>dirname</var></samp>
|
|
option then the compiler will search that directory within <var>dirname</var> for
|
|
native system headers rather than the default <samp>/usr/include</samp>.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-headers</code></dt>
|
|
<dt><code>--with-headers=<var>dir</var></code></dt>
|
|
<dd><p>Deprecated in favor of <samp>--with-sysroot</samp>.
|
|
Specifies that target headers are available when building a cross compiler.
|
|
The <var>dir</var> argument specifies a directory which has the target include
|
|
files. These include files will be copied into the <samp>gcc</samp> install
|
|
directory. <em>This option with the <var>dir</var> argument is required</em> when
|
|
building a cross compiler, if <samp><var>prefix</var>/<var>target</var>/sys-include</samp>
|
|
doesn’t pre-exist. If <samp><var>prefix</var>/<var>target</var>/sys-include</samp> does
|
|
pre-exist, the <var>dir</var> argument may be omitted. <code>fixincludes</code>
|
|
will be run on these files to make them compatible with GCC.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--without-headers</code></dt>
|
|
<dd><p>Tells GCC not use any target headers from a libc when building a cross
|
|
compiler. When crossing to GNU/Linux, you need the headers so GCC
|
|
can build the exception handling for libgcc.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-libs</code></dt>
|
|
<dt><code>--with-libs="<var>dir1</var> <var>dir2</var> … <var>dirN</var>"</code></dt>
|
|
<dd><p>Deprecated in favor of <samp>--with-sysroot</samp>.
|
|
Specifies a list of directories which contain the target runtime
|
|
libraries. These libraries will be copied into the <samp>gcc</samp> install
|
|
directory. If the directory list is omitted, this option has no
|
|
effect.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-newlib</code></dt>
|
|
<dd><p>Specifies that ‘<samp>newlib</samp>’ is
|
|
being used as the target C library. This causes <code>__eprintf</code> to be
|
|
omitted from <samp>libgcc.a</samp> on the assumption that it will be provided by
|
|
‘<samp>newlib</samp>’.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-avrlibc</code></dt>
|
|
<dd><p>Specifies that ‘<samp>AVR-Libc</samp>’ is
|
|
being used as the target C library. This causes float support
|
|
functions like <code>__addsf3</code> to be omitted from <samp>libgcc.a</samp> on
|
|
the assumption that it will be provided by <samp>libm.a</samp>. For more
|
|
technical details, cf. <a href="http://gcc.gnu.org/PR54461">PR54461</a>.
|
|
This option is only supported for the AVR target. It is not supported for
|
|
RTEMS configurations, which currently use newlib. The option is
|
|
supported since version 4.7.2 and is the default in 4.8.0 and newer.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-nds32-lib=<var>library</var></code></dt>
|
|
<dd><p>Specifies that <var>library</var> setting is used for building <samp>libgcc.a</samp>.
|
|
Currently, the valid <var>library</var> is ‘<samp>newlib</samp>’ or ‘<samp>mculib</samp>’.
|
|
This option is only supported for the NDS32 target.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-build-time-tools=<var>dir</var></code></dt>
|
|
<dd><p>Specifies where to find the set of target tools (assembler, linker, etc.)
|
|
that will be used while building GCC itself. This option can be useful
|
|
if the directory layouts are different between the system you are building
|
|
GCC on, and the system where you will deploy it.
|
|
</p>
|
|
<p>For example, on an ‘<samp>ia64-hp-hpux</samp>’ system, you may have the GNU
|
|
assembler and linker in <samp>/usr/bin</samp>, and the native tools in a
|
|
different path, and build a toolchain that expects to find the
|
|
native tools in <samp>/usr/bin</samp>.
|
|
</p>
|
|
<p>When you use this option, you should ensure that <var>dir</var> includes
|
|
<code>ar</code>, <code>as</code>, <code>ld</code>, <code>nm</code>,
|
|
<code>ranlib</code> and <code>strip</code> if necessary, and possibly
|
|
<code>objdump</code>. Otherwise, GCC may use an inconsistent set of
|
|
tools.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<a name="Overriding-configure-test-results"></a>
|
|
<h4 class="subsubheading">Overriding <code>configure</code> test results</h4>
|
|
|
|
<p>Sometimes, it might be necessary to override the result of some
|
|
<code>configure</code> test, for example in order to ease porting to a new
|
|
system or work around a bug in a test. The toplevel <code>configure</code>
|
|
script provides three variables for this:
|
|
</p>
|
|
<dl compact="compact">
|
|
<dt><code>build_configargs</code></dt>
|
|
<dd><a name="index-build_005fconfigargs"></a>
|
|
<p>The contents of this variable is passed to all build <code>configure</code>
|
|
scripts.
|
|
</p>
|
|
</dd>
|
|
<dt><code>host_configargs</code></dt>
|
|
<dd><a name="index-host_005fconfigargs"></a>
|
|
<p>The contents of this variable is passed to all host <code>configure</code>
|
|
scripts.
|
|
</p>
|
|
</dd>
|
|
<dt><code>target_configargs</code></dt>
|
|
<dd><a name="index-target_005fconfigargs"></a>
|
|
<p>The contents of this variable is passed to all target <code>configure</code>
|
|
scripts.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
<p>In order to avoid shell and <code>make</code> quoting issues for complex
|
|
overrides, you can pass a setting for <code>CONFIG_SITE</code> and set
|
|
variables in the site file.
|
|
</p>
|
|
<a name="Objective-C-Specific-Options"></a>
|
|
<h4 class="subheading">Objective-C-Specific Options</h4>
|
|
|
|
<p>The following options apply to the build of the Objective-C runtime library.
|
|
</p>
|
|
<dl compact="compact">
|
|
<dt><code>--enable-objc-gc</code></dt>
|
|
<dd><p>Specify that an additional variant of the GNU Objective-C runtime library
|
|
is built, using an external build of the Boehm-Demers-Weiser garbage
|
|
collector (<a href="http://www.hboehm.info/gc/">http://www.hboehm.info/gc/</a>). This library needs to be
|
|
available for each multilib variant, unless configured with
|
|
<samp>--enable-objc-gc=‘<samp>auto</samp>’</samp> in which case the build of the
|
|
additional runtime library is skipped when not available and the build
|
|
continues.
|
|
</p>
|
|
</dd>
|
|
<dt><code>--with-target-bdw-gc=<var>list</var></code></dt>
|
|
<dt><code>--with-target-bdw-gc-include=<var>list</var></code></dt>
|
|
<dt><code>--with-target-bdw-gc-lib=<var>list</var></code></dt>
|
|
<dd><p>Specify search directories for the garbage collector header files and
|
|
libraries. <var>list</var> is a comma separated list of key value pairs of the
|
|
form ‘<samp><var>multilibdir</var>=<var>path</var></samp>’, where the default multilib key
|
|
is named as ‘<samp>.</samp>’ (dot), or is omitted (e.g.
|
|
‘<samp>--with-target-bdw-gc=/opt/bdw-gc,32=/opt-bdw-gc32</samp>’).
|
|
</p>
|
|
<p>The options <samp>--with-target-bdw-gc-include</samp> and
|
|
<samp>--with-target-bdw-gc-lib</samp> must always be specified together
|
|
for each multilib variant and they take precedence over
|
|
<samp>--with-target-bdw-gc</samp>. If <samp>--with-target-bdw-gc-include</samp>
|
|
is missing values for a multilib, then the value for the default
|
|
multilib is used (e.g. ‘<samp>--with-target-bdw-gc-include=/opt/bdw-gc/include</samp>’
|
|
‘<samp>--with-target-bdw-gc-lib=/opt/bdw-gc/lib64,32=/opt-bdw-gc/lib32</samp>’).
|
|
If none of these options are specified, the library is assumed in
|
|
default locations.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<a name="D-Specific-Options"></a>
|
|
<h4 class="subheading">D-Specific Options</h4>
|
|
|
|
<p>The following options apply to the build of the D runtime library.
|
|
</p>
|
|
<dl compact="compact">
|
|
<dt><code>--with-target-system-zlib</code></dt>
|
|
<dd><p>Use installed ‘<samp>zlib</samp>’ rather than that included with GCC. This needs
|
|
to be available for each multilib variant, unless configured with
|
|
<samp>--with-target-system-zlib=‘<samp>auto</samp>’</samp> in which case the GCC included
|
|
‘<samp>zlib</samp>’ is only used when the system installed library is not available.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<hr />
|
|
<p>
|
|
<p><a href="./index.html">Return to the GCC Installation page</a>
|
|
</p>
|
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</body>
|
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</html>
|