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| author | Torok Edwin <edwintorok@gmail.com> | 2009-06-03 15:06:19 +0000 |
|---|---|---|
| committer | Torok Edwin <edwintorok@gmail.com> | 2009-06-03 15:06:19 +0000 |
| commit | 5641f8d67f16b44a03290b6884ac18a08623a291 (patch) | |
| tree | e0b1fd9c7082989a9e258fb5a937f38fb7ddb054 /docs/GoldPlugin.html | |
| parent | 703e235f0cb6882e0a7ab3b023422c600821a7ef (diff) | |
| download | external_llvm-5641f8d67f16b44a03290b6884ac18a08623a291.zip external_llvm-5641f8d67f16b44a03290b6884ac18a08623a291.tar.gz external_llvm-5641f8d67f16b44a03290b6884ac18a08623a291.tar.bz2 | |
Document how easy it is to use the gold plugin and have LTO with autotooled projects.
Please correct the documentation if I missed anything.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72773 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/GoldPlugin.html')
| -rw-r--r-- | docs/GoldPlugin.html | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/docs/GoldPlugin.html b/docs/GoldPlugin.html index ee01410..845ea1c 100644 --- a/docs/GoldPlugin.html +++ b/docs/GoldPlugin.html @@ -14,6 +14,7 @@ <li><a href="#usage">Usage</a> <ul> <li><a href="#example1">Example of link time optimization</a></li> + <li><a href="#lto_autotools">Quickstart for using LTO with autotooled projects</a></li> </ul></li> <li><a href="#licensing">Licensing</a></li> </ol> @@ -136,6 +137,34 @@ $ llvm-gcc -use-gold-plugin a.o b.o -o main # <-- link with LLVMgold plugin </div> <!--=========================================================================--> +<div class="doc_section"><a name="lto_autotools">Quickstart for using LTO with autotooled projects</a></div> +<!--=========================================================================--> +<div class="doc_text"> + <p><tt>gold</tt>, <tt>ar</tt> and <tt>nm</tt> all support plugins now, so everything should be + in place for an easy to use LTO build of autotooled projects:</p> + <ul> + <li>Follow the instructions <a href="#build">on how to build libLLVMgold.so</a>.</li> + <li>Install the newly built binutils to <tt>$PREFIX</tt></li> + <li>Copy <tt>Release/lib/libLLVMgold.so</tt> to + <tt>$PREFIX/libexec/gcc/x86_64-unknown-linux-gnu/4.2.1/</tt> and + <tt>$PREFIX/lib/bfd-plugins/</tt></li> + <li>Set environment variables (<tt>$PREFIX</tt> is where you installed llvm-gcc and + binutils): + <pre class="doc_code"> +export CC="$PREFIX/bin/llvm-gcc -use-gold-plugin" +export AR="$PREFIX/bin/ar --plugin libLLVMgold.so" +export NM="$PREFIX/bin/nm --plugin libLLVMgold.so" +export RANLIB=/bin/true #ranlib is not needed, and doesn't support .bc files in .a +export CFLAGS="-O4" + </pre> + </li> + <li>Configure & build the project as usual: <tt>./configure && make && make check</tt> </li> + </ul> + <p> The environment variable settings may work for non-autotooled projects + too, but you may need to set the <tt>LD</tt> environment variable as well.</p> +</div> + +<!--=========================================================================--> <div class="doc_section"><a name="licensing">Licensing</a></div> <!--=========================================================================--> <div class="doc_text"> |