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Add notes on Ada compilers that can be used for

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the build.  Put all items that the user should
specify in bold.  Make it a debug build.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47063 91177308-0d34-0410-b5e6-96231b3b80d8
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Duncan Sands 2008-02-13 16:46:10 +00:00
parent a65ee03bb2
commit 20dcb4c24d
1 changed files with 21 additions and 10 deletions
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@ -92,14 +92,22 @@ top-level <tt>README.LLVM</tt> file, adding ",ada" to EXTRALANGS, for example:
systems without some work.</p></li>
<li><p>The build requires having a compiler that supports Ada, C and C++.
The Ada front-end is written in Ada so an Ada compiler is needed to
build it. The LLVM parts of llvm-gcc are written in C++ so a C++
build it. What is more, the Ada compiler must not be more recent
than what it is trying to compile, otherwise the build will fail.
This rules out gcc-4.3 (but not gcc-4.2) and also the
<a href="http://libre.adacore.com/">2007 GNAT GPL Edition</a>.
The LLVM parts of llvm-gcc are written in C++ so a C++
compiler is needed to build them. The rest of gcc is written in C.
Some linux distributions provide a version of gcc that supports all
three languages (the Ada part often comes as an add-on package to
the rest of gcc). Otherwise it is possible to combine two versions
of gcc, one that supports Ada and C (such as
<a href="http://libre.adacore.com/">GNAT GPL Edition</a>) and another
which supports C++, see below.</p></li>
of gcc, one that supports Ada and C (such as the
<a href="http://libre.adacore.com/">2006 GNAT GPL Edition</a>)
and another which supports C++, see below.</p></li>
<li><p>Because the Ada front-end is experimental, it is wise to build the
compiler with checking enabled. This causes it to run slower, but
helps catch mistakes in the compiler (please report any problems using
<a href="http://llvm.org/bugs">LLVM bugzilla</a>).</p></li>
</ol>
<p>Supposing appropriate compilers are available, llvm-gcc with Ada support can
@ -153,21 +161,22 @@ cd llvm-objects</pre>
<li><p>Configure LLVM (here it is configured to install into <tt>/usr/local</tt>):</p>
<div class="doc_code">
<pre>../llvm/configure --prefix=/usr/local</pre>
<pre>../llvm/configure --prefix=<b>/usr/local</b></pre>
</div>
<p>If you have a multi-compiler setup and the C++ compiler is not the
default, then you can configure like this:</p>
<div class="doc_code">
<pre>CXX=<b>PATH_TO_C++_COMPILER</b> ../llvm/configure --prefix=/usr/local</pre>
<pre>CXX=<b>PATH_TO_C++_COMPILER</b> ../llvm/configure --prefix=<b>/usr/local</b></pre>
</div>
</li>
<li><p>Build LLVM:</p>
<li><p>Build LLVM with checking enabled (use <tt>ENABLE_OPTIMIZED=1</tt> to
build without checking):</p>
<div class="doc_code">
<pre>make</pre>
<pre>make ENABLE_OPTIMIZED=0</pre>
</div>
</li>
@ -190,11 +199,13 @@ cd llvm-gcc-4.2-objects</pre>
</li>
<li><p>Configure llvm-gcc (here it is configured to install into <tt>/usr/local</tt>).
The <tt>--enable-checking</tt> flag turns on sanity checks inside the compiler.
If you omit it then LLVM must be built with <tt>make ENABLE_OPTIMIZED=1</tt>.
Additional languages can be appended to the --enable-languages switch,
for example <tt>--enable-languages=ada,c,c++</tt>.</p>
<div class="doc_code">
<pre>../llvm-gcc-4.2/configure --prefix=/usr/local --enable-languages=ada,c --enable-checking --enable-llvm=$PWD/../llvm-objects --disable-shared --disable-bootstrap --disable-multilib</pre>
<pre>../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c --enable-checking --enable-llvm=$PWD/../llvm-objects --disable-shared --disable-bootstrap --disable-multilib</pre>
</div>
<p>If you have a multi-compiler setup, then you can configure like this:</p>
@ -203,7 +214,7 @@ cd llvm-gcc-4.2-objects</pre>
<pre>
export CC=<b>PATH_TO_C_AND_ADA_COMPILER</b>
export CXX=<b>PATH_TO_C++_COMPILER</b>
../llvm-gcc-4.2/configure --prefix=/usr/local --enable-languages=ada,c --enable-checking --enable-llvm=$PWD/../llvm-objects --disable-shared --disable-bootstrap --disable-multilib</pre>
../llvm-gcc-4.2/configure --prefix=<b>/usr/local</b> --enable-languages=ada,c --enable-checking --enable-llvm=$PWD/../llvm-objects --disable-shared --disable-bootstrap --disable-multilib</pre>
</div>
</li>