forked from OSchip/llvm-project
Cleaned up the document. Added "doc_code" divisions for code examples.
llvm-svn: 31784
This commit is contained in:
Bill Wendling
parent
d811cc6818
commit
ae2a3097e6
|
|
@ -36,22 +36,24 @@
|
|||
<!-- *********************************************************************** -->
|
||||
|
||||
<div class="doc_text">
|
||||
<p>This document is intended to explain the process of building the
|
||||
LLVM C/C++ front-end from its source code. You have to do this, for example, if
|
||||
you are porting LLVM to a new architecture or operating system, if you are
|
||||
working from Top-Of-Tree CVS/SVN, or if there is no precompiled snapshot
|
||||
available.</p>
|
||||
|
||||
<p><b>NOTE:</b> This is currently a somewhat fragile, error-prone
|
||||
process, and you should <b>only</b> try to do it if:</p>
|
||||
<p>This document is intended to explain the process of building the LLVM C/C++
|
||||
front-end from its source code. You have to do this, for example, if you are
|
||||
porting LLVM to a new architecture or operating system, if you are working from
|
||||
Top-Of-Tree CVS/SVN, or if there is no precompiled snapshot available.</p>
|
||||
|
||||
<p><b>NOTE:</b> This is currently a somewhat fragile, error-prone process, and
|
||||
you should <b>only</b> try to do it if:</p>
|
||||
|
||||
<ol>
|
||||
<li>you really, really, really can't use the binaries we distribute</li>
|
||||
<li>you really, <em>really</em>, <b><em>really</em></b> can't use the
|
||||
binaries we distribute</li>
|
||||
<li>you are an elite GCC hacker.</li>
|
||||
<li>you want to use the latest bits from CVS.</li>
|
||||
</ol>
|
||||
|
||||
<p>We welcome patches to help make this process simpler.</p>
|
||||
|
||||
</div>
|
||||
|
||||
<!--=========================================================================-->
|
||||
|
|
@ -61,38 +63,48 @@ process, and you should <b>only</b> try to do it if:</p>
|
|||
<!--=========================================================================-->
|
||||
|
||||
<div class="doc_text">
|
||||
|
||||
<p>If you are building LLVM and the GCC front-end under Cygwin, please note that
|
||||
the LLVM and GCC makefiles do not correctly handle spaces in paths. To deal
|
||||
with this issue, make sure that your LLVM and GCC source and build trees are
|
||||
located in a top-level directory (like <tt>/cygdrive/c/llvm</tt> and
|
||||
with this issue, make sure that your LLVM and GCC source and build trees are
|
||||
located in a top-level directory (like <tt>/cygdrive/c/llvm</tt> and
|
||||
<tt>/cygdrive/c/llvm-cfrontend</tt>), not in a directory that contains a space
|
||||
(which includes your "home directory", because it lives under the "Documents
|
||||
and Settings" directory). We welcome patches to fix this issue.
|
||||
</p>
|
||||
(which includes your "home directory", because it lives under the "Documents and
|
||||
Settings" directory). We welcome patches to fix this issue.</p>
|
||||
|
||||
<p>It has been found that the GCC 3.3.3 compiler provided with recent Cygwin
|
||||
versions is incapable of compiling the LLVM GCC front-end correctly. If your
|
||||
Cygwin
|
||||
installation includes GCC 3.3.3, we <i>strongly</i> recommend that you download
|
||||
GCC 3.4.3, build it separately, and use it for compiling the LLVM GCC front-end.
|
||||
This has been
|
||||
shown to work correctly.</p>
|
||||
Cygwin installation includes GCC 3.3.3, we <em>strongly</em> recommend that you
|
||||
download GCC 3.4.3, build it separately, and use it for compiling the LLVM GCC
|
||||
front-end. This has been shown to work correctly.</p>
|
||||
|
||||
<p>Some versions of Cygwin utilize an experimental version of GNU binutils that
|
||||
will cause the GNU <tt>ld</tt> linker to fail an assertion when linking
|
||||
components of the libstdc++. It is recommended that you replace the entire
|
||||
binutils package with version 2.15 such that "<tt>ld --version</tt>" responds
|
||||
with</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>GNU ld version 2.15</pre>
|
||||
not with:<br/>
|
||||
</div>
|
||||
|
||||
<p>not with:</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>GNU ld version 2.15.91 20040725</pre>
|
||||
</div>
|
||||
|
||||
</div>
|
||||
|
||||
<!--=========================================================================-->
|
||||
<div class="doc_subsection"><a name="aix">Building under AIX</a></div>
|
||||
|
||||
<div class="doc_text">
|
||||
|
||||
<p>If you are building LLVM and the GCC front-end under AIX, do NOT use GNU
|
||||
Binutils. They are not stable under AIX and may produce incorrect and/or
|
||||
invalid code. Instead, use the system assembler and linker.
|
||||
</p>
|
||||
invalid code. Instead, use the system assembler and linker.</p>
|
||||
|
||||
</div>
|
||||
|
||||
<!-- *********************************************************************** -->
|
||||
|
|
@ -104,33 +116,37 @@ invalid code. Instead, use the system assembler and linker.
|
|||
<div class="doc_text">
|
||||
|
||||
<p>This section describes how to aquire and build llvm-gcc4, which is based on
|
||||
the GCC 4.0.1 front-end. This front-end supports C, C++, Objective-C, and
|
||||
the GCC 4.0.1 front-end. This front-end supports C, C++, Objective-C, and
|
||||
Objective-C++. Note that the instructions for building this front-end are
|
||||
completely different than those for building llvm-gcc3.
|
||||
</p>
|
||||
completely different than those for building llvm-gcc3.</p>
|
||||
|
||||
<ol>
|
||||
<li>
|
||||
<p>Retrieve the appropriate llvm-gcc4-x.y.source.tar.gz archive from the llvm
|
||||
web site.</p>
|
||||
<p>It is also possible to download the sources of the llvm-gcc4 front end from
|
||||
a read-only mirror using subversion. To check out the code the first time use:
|
||||
</p>
|
||||
<li><p>Retrieve the appropriate llvm-gcc4-x.y.source.tar.gz archive from the
|
||||
llvm web site.</p>
|
||||
|
||||
<tt>svn co svn://anonsvn.opensource.apple.com/svn/llvm/trunk
|
||||
<i>dst-directory</i></tt>
|
||||
<p>It is also possible to download the sources of the llvm-gcc4 front end
|
||||
from a read-only mirror using subversion. To check out the code the
|
||||
first time use:</p>
|
||||
|
||||
<p>After that, the code can be be updated in the destination directory using;
|
||||
</p>
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
svn co svn://anonsvn.opensource.apple.com/svn/llvm/trunk <i>dst-directory</i>
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
<tt>svn update</tt>
|
||||
<p>After that, the code can be be updated in the destination directory
|
||||
using:</p>
|
||||
|
||||
<p>The mirror is brought up to date every evening.</p>
|
||||
</li>
|
||||
<div class="doc_code">
|
||||
<pre>svn update</pre>
|
||||
</div>
|
||||
|
||||
<li>Follow the directions in the top-level README.LLVM file for up-to-date
|
||||
instructions on how to build llvm-gcc4.</li>
|
||||
<p>The mirror is brought up to date every evening.</p></li>
|
||||
|
||||
<li>Follow the directions in the top-level <tt>README.LLVM</tt> file for
|
||||
up-to-date instructions on how to build llvm-gcc4.</li>
|
||||
</ol>
|
||||
|
||||
</div>
|
||||
|
||||
<!-- *********************************************************************** -->
|
||||
|
|
@ -140,192 +156,251 @@ a read-only mirror using subversion. To check out the code the first time use:
|
|||
<!-- *********************************************************************** -->
|
||||
|
||||
<div class="doc_text">
|
||||
|
||||
<ol>
|
||||
<li>Aquire llvm-gcc3 from <a href="GettingStarted.html#checkout">LLVM CVS</a> or
|
||||
from a <a href="http://llvm.org/releases/">release tarball</a>.</li>
|
||||
<li>Aquire llvm-gcc3 from <a href="GettingStarted.html#checkout">LLVM CVS</a>
|
||||
or from a <a href="http://llvm.org/releases/">release tarball</a>.</li>
|
||||
|
||||
<li><p>Configure and build the LLVM libraries and tools. There are two ways to
|
||||
do this: either with <i>objdir</i> == <i>srcdir</i> or
|
||||
<i>objdir</i> != <i>srcdir</i>. It is recommended
|
||||
that <i>srcdir</i> be the same as <i>objdir</i> for your LLVM tree (but note
|
||||
that you should always use <i>srcdir</i> != <i>objdir</i> for llvm-gcc):</p>
|
||||
<ul>
|
||||
<li>With <i>objdir</i> != <i>srcdir</i>:<pre>
|
||||
% cd <i>objdir</i>
|
||||
% <i>srcdir</i>/configure --prefix=/some/path/you/can/install/to [options...]
|
||||
% gmake tools-only
|
||||
</pre></li>
|
||||
<li>With <i>objdir</i> == <i>srcdir</i>:<pre>
|
||||
% cd llvm
|
||||
% ./configure --prefix=/some/path/you/can/install/to [options...]
|
||||
% gmake tools-only
|
||||
</pre></li>
|
||||
</ul>
|
||||
<p>This will build all of the LLVM tools and libraries. The <tt>--prefix</tt>
|
||||
option defaults to /usr/local (per configure standards) but unless you are a
|
||||
system administrator, you probably won't be able to install LLVM there because
|
||||
of permissions. Specify a path into which LLVM can be installed (e.g.
|
||||
<tt>--prefix=/home/user/llvm</tt>).</p>
|
||||
</li>
|
||||
<li><p>Configure and build the LLVM libraries and tools. There are two ways to
|
||||
do this: either with <tt><i>objdir</i> == <i>srcdir</i></tt> or
|
||||
<tt><i>objdir</i> != <i>srcdir</i></tt>. It is recommended that
|
||||
<tt><i>srcdir</i></tt> be the same as <tt><i>objdir</i></tt> for your
|
||||
LLVM tree (but note that you should always use <tt><i>srcdir</i> !=
|
||||
<i>objdir</i></tt> for llvm-gcc):</p>
|
||||
|
||||
<li><p>Add the directory containing the tools to your PATH.</p>
|
||||
<ul>
|
||||
<li><p>With <tt><i>objdir</i> != <i>srcdir</i></tt>:</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
% set path = ( `cd llvm/Debug/bin && pwd` $path )
|
||||
</pre></li>
|
||||
|
||||
<li><p>Unpack the C/C++ front-end source into cfrontend/src, either by
|
||||
untar'ing a cfrontend.source.tar.gz file or checking out CVS into this
|
||||
directory.</p></li>
|
||||
|
||||
<li><p>Make "build" and "install" directories as siblings of the "src" tree:</p>
|
||||
<pre>
|
||||
% pwd
|
||||
/usr/local/example/cfrontend/src
|
||||
% cd ..
|
||||
% mkdir build install
|
||||
% set CFEINSTALL = `pwd`/install
|
||||
</pre></li>
|
||||
|
||||
|
||||
<li><p>Configure, build, and install the GCC front-end:</p>
|
||||
|
||||
<p>
|
||||
<b>Linux/x86:</b><br>
|
||||
<b>Linux/IA-64:</b><br>
|
||||
<b>MacOS X/PowerPC</b> (requires dlcompat library):<br>
|
||||
<b>AIX/PowerPC:</b>
|
||||
</p>
|
||||
|
||||
<pre>
|
||||
% cd build
|
||||
% ../src/configure --prefix=$CFEINSTALL --disable-threads --disable-nls \
|
||||
--disable-shared --enable-languages=c,c++ --program-prefix=llvm-
|
||||
% gmake all; gmake install
|
||||
% cd <i>objdir</i>
|
||||
% <i>srcdir</i>/configure --prefix=/some/path/you/can/install/to [options...]
|
||||
% gmake tools-only
|
||||
</pre>
|
||||
</div>
|
||||
</li>
|
||||
<li><p>With <tt><i>objdir</i> == <i>srcdir</i></tt>:</p>
|
||||
|
||||
<p><b>Cygwin/x86:</b></p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
% cd build
|
||||
% ../src/configure --prefix=$CFEINSTALL --disable-threads --disable-nls \
|
||||
--disable-shared --enable-languages=c,c++ --disable-c-mbchar \
|
||||
--program-prefix=llvm-
|
||||
% gmake all; gmake install
|
||||
% cd llvm
|
||||
% ./configure --prefix=/some/path/you/can/install/to [options...]
|
||||
% gmake tools-only
|
||||
</pre>
|
||||
</div>
|
||||
</li>
|
||||
</ul>
|
||||
|
||||
<p><b>Solaris/SPARC:</b></p>
|
||||
|
||||
<p>
|
||||
The GCC front-end can be configured for either SPARC V8 (32 bit) or SPARC V9 (64
|
||||
bit). This changes, among other things, the sizes of integer types and the
|
||||
macros defined for conditional compilation.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The SPARC V8 ABI support is more robust than the V9 ABI support and can generate
|
||||
SPARC V9 code. It is highly recommended that you use the V8 ABI with LLVM, as
|
||||
shown below. Also,
|
||||
note that Solaris has trouble with various wide (multibyte) character
|
||||
functions from C as referenced from C++, so we typically configure with
|
||||
--disable-c-mbchar (cf. <a href="http://llvm.org/PR206">Bug 206</a>).
|
||||
</p>
|
||||
<p>This will build all of the LLVM tools and libraries. The
|
||||
<tt>--prefix</tt> option defaults to <tt>/usr/local</tt> (per configure
|
||||
standards) but unless you are a system administrator, you probably
|
||||
won't be able to install LLVM there because of permissions. Specify a
|
||||
path into which LLVM can be installed
|
||||
(e.g. <tt>--prefix=/home/user/llvm</tt>).</p></li>
|
||||
<li><p>Add the directory containing the tools to your PATH.</p>
|
||||
|
||||
<div class="doc_code">
|
||||
csh:
|
||||
<pre>
|
||||
% cd build
|
||||
% ../src/configure --prefix=$CFEINSTALL --disable-threads --disable-nls \
|
||||
--disable-shared --enable-languages=c,c++ --host=sparc-sun-solaris2.8 \
|
||||
--disable-c-mbchar --program-prefix=llvm-
|
||||
% gmake all; gmake install
|
||||
% set path = ( `cd llvm/Debug/bin && pwd` $path )
|
||||
</pre>
|
||||
|
||||
<p><b>Common Problem:</b> You may get error messages regarding the fact
|
||||
that LLVM does not support inline assembly. Here are two common
|
||||
fixes:</p>
|
||||
|
||||
<ul>
|
||||
<li><p><b>Fix 1:</b> If you have system header files that include
|
||||
inline assembly, you may have to modify them to remove the inline
|
||||
assembly and install the modified versions in
|
||||
<code>$CFEINSTALL/lib/gcc/<i>target-triplet</i>/3.4-llvm/include</code>.</li>
|
||||
|
||||
<li><b>Fix 2:</b> If you are building the C++ front-end on a CPU we
|
||||
haven't tried yet, you will probably have to edit the appropriate
|
||||
version of atomicity.h under
|
||||
<code>src/libstdc++-v3/config/cpu/<i>name-of-cpu</i>/atomicity.h</code>
|
||||
and apply a patch so that it does not use inline assembly.</li>
|
||||
</ul>
|
||||
|
||||
<p><b>Porting to a new architecture:</b> If you are porting the front-end
|
||||
to a new architecture or compiling in a configuration that we have
|
||||
not tried 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>Often targets include special assembler or 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>You may have to disable multilib support in your target. Using multilib
|
||||
support causes the GCC compiler driver to add a lot of "<tt>-L</tt>"
|
||||
options to the link line, which do not relate to LLVM and confuse
|
||||
<tt>gccld</tt>. To disable multilibs, delete any
|
||||
<tt>MULTILIB_OPTIONS</tt> lines from your target files.</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>
|
||||
|
||||
<li><p>Put <tt>$CFEINSTALL/bin</tt> into your <tt>PATH</tt> environment
|
||||
variable.</p>
|
||||
<ul>
|
||||
<li>sh: <tt>export PATH=$CFEINSTALL/bin:$PATH</tt></li>
|
||||
<li>csh: <tt>setenv PATH $CFEINSTALL/bin:$PATH</tt></li>
|
||||
</ul>
|
||||
</li>
|
||||
|
||||
<li><p>Go back into the LLVM source tree proper. Rerun configure, using
|
||||
the same options as the last time. This will cause the configuration to now find
|
||||
the newly built llvm-gcc and llvm-g++ executables. </p></li>
|
||||
|
||||
<li><p>Rebuild your CVS tree. This shouldn't cause the whole thing to be
|
||||
rebuilt, but it should build the runtime libraries. After the tree is
|
||||
built, install the runtime libraries into your GCC front-end build tree.
|
||||
These are the commands you need:</p>
|
||||
sh:
|
||||
<pre>
|
||||
% gmake
|
||||
% gmake -C runtime install-bytecode
|
||||
</pre></li>
|
||||
|
||||
<li><p>Optionally, build a symbol table for the newly installed runtime
|
||||
libraries. Although this step is optional, you are strongly encouraged to
|
||||
do this as the symbol tables will make a significant difference in your
|
||||
link times. Use the <tt>llvm-ranlib</tt> tool to do this, as follows:</p>
|
||||
<pre>
|
||||
% cd $CFEINSTALL/lib
|
||||
% llvm-ranlib libiberty.a
|
||||
% llvm-ranlib libstdc++.a
|
||||
% llvm-ranlib libsupc++.a
|
||||
% cd $CFEINSTALL/lib/gcc/<i>target-triplet</i>/3.4-llvm
|
||||
% llvm-ranlib libgcc.a
|
||||
% llvm-ranlib libgcov.a
|
||||
% export PATH=`cd llvm/Debug/bin && pwd`:$PATH
|
||||
</pre>
|
||||
</div>
|
||||
</li>
|
||||
|
||||
<li><p>Test the newly-installed C frontend by one or more of the
|
||||
following means:</p>
|
||||
<ul>
|
||||
<li> running the feature & regression tests via <tt>make check</tt></li>
|
||||
<li> compiling and running a "hello, LLVM" program in C and C++.</li>
|
||||
<li> running the tests found in the <tt>llvm-test</tt> CVS module</li>
|
||||
</ul></li>
|
||||
<li><p>Unpack the C/C++ front-end source into cfrontend/src, either by
|
||||
untar'ing a cfrontend.source.tar.gz file or checking out CVS into this
|
||||
directory.</p></li>
|
||||
<li><p>Make "build" and "install" directories as siblings of the "src"
|
||||
tree:</p>
|
||||
|
||||
<div class="doc_code">
|
||||
csh:
|
||||
<pre>
|
||||
% pwd
|
||||
/usr/local/example/cfrontend/src
|
||||
% cd ..
|
||||
% mkdir build install
|
||||
% set CFEINSTALL = `pwd`/install
|
||||
</pre>
|
||||
sh:
|
||||
<pre>
|
||||
% pwd
|
||||
/usr/local/example/cfrontend/src
|
||||
% cd ..
|
||||
% mkdir build install
|
||||
% export CFEINSTALL=`pwd`/install
|
||||
</pre>
|
||||
</div>
|
||||
</li>
|
||||
|
||||
<li><p>Configure, build, and install the GCC front-end:</p>
|
||||
|
||||
<p>
|
||||
<b>Linux/x86:</b><br>
|
||||
<b>Linux/IA-64:</b><br>
|
||||
<b>MacOS X/PowerPC</b> (requires dlcompat library):<br>
|
||||
<b>AIX/PowerPC:</b>
|
||||
</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
% cd build
|
||||
% ../src/configure --prefix=$CFEINSTALL --disable-threads --disable-nls \
|
||||
--disable-shared --enable-languages=c,c++ --program-prefix=llvm-
|
||||
% gmake all; gmake install
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
<p><b>Cygwin/x86:</b></p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
% cd build
|
||||
% ../src/configure --prefix=$CFEINSTALL --disable-threads --disable-nls \
|
||||
--disable-shared --enable-languages=c,c++ --disable-c-mbchar \
|
||||
--program-prefix=llvm-
|
||||
% gmake all; gmake install
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
<p><b>Solaris/SPARC:</b></p>
|
||||
|
||||
<p>The GCC front-end can be configured for either SPARC V8 (32 bit) or
|
||||
SPARC V9 (64 bit). This changes, among other things, the sizes of
|
||||
integer types and the macros defined for conditional compilation.</p>
|
||||
|
||||
<p>The SPARC V8 ABI support is more robust than the V9 ABI support and can
|
||||
generate SPARC V9 code. It is highly recommended that you use the V8
|
||||
ABI with LLVM, as shown below. Also, note that Solaris has trouble
|
||||
with various wide (multibyte) character functions from C as referenced
|
||||
from C++, so we typically configure with --disable-c-mbchar (cf. <a
|
||||
href="http://llvm.org/PR206">Bug 206</a>).</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
% cd build
|
||||
% ../src/configure --prefix=$CFEINSTALL --disable-threads --disable-nls \
|
||||
--disable-shared --enable-languages=c,c++ --host=sparc-sun-solaris2.8 \
|
||||
--disable-c-mbchar --program-prefix=llvm-
|
||||
% gmake all; gmake install
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
<p><b>Common Problem:</b> You may get error messages regarding the fact
|
||||
that LLVM does not support inline assembly. Here are two common
|
||||
fixes:</p>
|
||||
|
||||
<ul>
|
||||
<li><p><b>Fix 1:</b> If you have system header files that include inline
|
||||
assembly, you may have to modify them to remove the inline assembly
|
||||
and install the modified versions in
|
||||
<code>$CFEINSTALL/lib/gcc/<i>target-triplet</i>/3.4-llvm/include</code>.</li>
|
||||
|
||||
<li><b>Fix 2:</b> If you are building the C++ front-end on a CPU we
|
||||
haven't tried yet, you will probably have to edit the appropriate
|
||||
version of atomicity.h under
|
||||
<code>src/libstdc++-v3/config/cpu/<i>name-of-cpu</i>/atomicity.h</code>
|
||||
and apply a patch so that it does not use inline assembly.</li>
|
||||
</ul>
|
||||
|
||||
<p><b>Porting to a new architecture:</b> If you are porting the front-end
|
||||
to a new architecture or compiling in a configuration that we have not
|
||||
tried 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>Often targets include special assembler or 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>You may have to disable multilib support in your target. Using
|
||||
multilib support causes the GCC compiler driver to add a lot of
|
||||
"<tt>-L</tt>" options to the link line, which do not relate to LLVM
|
||||
and confuse <tt>gccld</tt>. To disable multilibs, delete any
|
||||
<tt>MULTILIB_OPTIONS</tt> lines from your target files.</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>
|
||||
|
||||
<li><p>Put <tt>$CFEINSTALL/bin</tt> into your <tt>PATH</tt> environment
|
||||
variable.</p>
|
||||
|
||||
<div class="doc_code">
|
||||
csh:
|
||||
<pre>
|
||||
% setenv PATH $CFEINSTALL/bin:$PATH
|
||||
</pre>
|
||||
sh:
|
||||
<pre>
|
||||
% export PATH=$CFEINSTALL/bin:$PATH
|
||||
</pre>
|
||||
</div>
|
||||
</li>
|
||||
|
||||
<li><p>Go back into the LLVM source tree proper. Rerun configure, using the
|
||||
same options as the last time. This will cause the configuration to now
|
||||
find the newly built llvm-gcc and llvm-g++ executables. </p></li>
|
||||
|
||||
<li><p>Rebuild your CVS tree. This shouldn't cause the whole thing to be
|
||||
rebuilt, but it should build the runtime libraries. After the tree is
|
||||
built, install the runtime libraries into your GCC front-end build tree.
|
||||
These are the commands you need:</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
% gmake
|
||||
% gmake -C runtime install-bytecode
|
||||
</pre>
|
||||
</div>
|
||||
</li>
|
||||
|
||||
<li><p>Optionally, build a symbol table for the newly installed runtime
|
||||
libraries. Although this step is optional, you are strongly encouraged to
|
||||
do this as the symbol tables will make a significant difference in your
|
||||
link times. Use the <tt>llvm-ranlib</tt> tool to do this, as follows:</p>
|
||||
|
||||
<div class="doc_code">
|
||||
<pre>
|
||||
% cd $CFEINSTALL/lib
|
||||
% llvm-ranlib libiberty.a
|
||||
% llvm-ranlib libstdc++.a
|
||||
% llvm-ranlib libsupc++.a
|
||||
% cd $CFEINSTALL/lib/gcc/<i>target-triplet</i>/3.4-llvm
|
||||
% llvm-ranlib libgcc.a
|
||||
% llvm-ranlib libgcov.a
|
||||
</pre>
|
||||
</div>
|
||||
</li>
|
||||
|
||||
<li><p>Test the newly-installed C frontend by one or more of the following
|
||||
means:</p>
|
||||
|
||||
<ul>
|
||||
<li>running the feature & regression tests via <tt>make
|
||||
check</tt></li>
|
||||
<li>compiling and running a "hello, LLVM" program in C and C++.</li>
|
||||
<li>running the tests found in the <tt>llvm-test</tt> CVS module</li>
|
||||
</ul></li>
|
||||
</ol>
|
||||
|
||||
</div>
|
||||
|
||||
<!-- *********************************************************************** -->
|
||||
|
|
|
|||
Loading…
Reference in New Issue