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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9399 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2003-10-23 03:55:23 +00:00
parent c3afd9bf4b
commit e38c628939
1 changed files with 21 additions and 14 deletions
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docs/CFEBuildInstrs.html
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@ -71,7 +71,7 @@ good GCC hacker.</p>
% gmake all; gmake install
</pre>
<p><b>Common Problem 1:</b> You may get error messages regarding the fact
<p><b>Common Problem:</b> You may get error messages regarding the fact
that LLVM does not support inline assembly. Here are two common
fixes:</p>
@ -88,19 +88,26 @@ good GCC hacker.</p>
and apply a patch so that it does not use inline assembly.</p></li>
</ul>
<p><b>Common Problem 2:</b> <b>FIXME:</b> Chris should add a section about
common problems porting to a new architecture, including changes you
might have to make to the <tt>gcc/gcc/config/<i>name-of-cpu</i></tt>
directory. For example (expand these):</p>
<p><b>Porting to a new architecture:</b> If you are porting the new front-end
to a new architecture, or compiling in a different configuration that we have
previously, there are probably several changes you will have to make to the GCC
target to get it to work correctly. These include:<p>
<ul>
<li>Munge linker flags so they are compatible with <tt>gccld</tt>.</li>
<li>Change the target so it doesn't have long double; just use double
instead.</li>
<li>No inline assembly for position independent code.</li>
<li>We handle init and fini differently.</li>
<li>Do not include inline assembly map things for SPARC, or profile
things.</li>
<li>Often targets include special or assembler linker flags which
<tt>gccas</tt>/<tt>gccld</tt> does not understand. In general, these can
just be removed.</li>
<li>LLVM currently does not support any floating point values other than
32-bit and 64-bit IEEE floating point. The primary effect of this is
that you may have to map "long double" onto "double".</li>
<li>The profiling hooks in GCC do not apply at all to the LLVM front-end.
These may need to be disabled.</li>
<li>No inline assembly for position independent code. At the LLVM level,
everything is position independent.</li>
<li>We handle <tt>.init</tt> and <tt>.fini</tt> differently.</li>
<li>Did we mention that we don't support inline assembly? You'll probably
have to add some fixinclude hacks to disable it in the system
headers.</li>
</ul>
</li>
@ -129,8 +136,8 @@ libgcc.a library, which you can find by running
<li><p>Test the newly-installed C frontend by one or more of the
following means:</p>
<ul>
<li> compiling and running a "hello, world" program in C or C++.</li>
<li> running the tests under test/Programs using <code>gmake -C
<li> compiling and running a "hello, LLVM" program in C and C++.</li>
<li> running the tests under <tt>test/Programs</tt> using <code>gmake -C
test/Programs</code></li>
</ul>
</p>