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CMake: document how to incorporate LLVM into the cmake project of an

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external project.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110561 91177308-0d34-0410-b5e6-96231b3b80d8
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Oscar Fuentes 2010-08-09 03:26:48 +00:00
parent 6252e98709
commit c2d868875e
1 changed files with 33 additions and 2 deletions
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@ -354,7 +354,38 @@
<div class="doc_text">
<p>TODO</p>
<p>The most difficult part of adding LLVM to the build of a project
is to determine the set of LLVM libraries corresponding to the set
of required LLVM features. What follows is an example of how to
obtain this information:</p>
<div class="doc_code">
<pre>
<b># A convenience variable:</b>
set(LLVM_ROOT "" CACHE PATH "Root of LLVM install.")
<b># A bit of a sanity check:</b>
if( NOT EXISTS ${LLVM_ROOT}/include/llvm )
message(FATAL_ERROR "LLVM_ROOT (${LLVM_ROOT}) is not a valid LLVM install")
endif()
<b># We incorporate the CMake features provided by LLVM:</b>
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${LLVM_ROOT}/share/llvm/cmake")
include(LLVM)
<b># Now set the header and library paths:</b>
include_directories( ${LLVM_ROOT}/include )
link_directories( ${LLVM_ROOT}/lib )
<b># Let's suppose we want to build a JIT compiler with support for
# binary code (no interpreter):</b>
llvm_map_components_to_libraries(REQ_LLVM_LIBRARIES jit native)
<b># Finally, we link the LLVM libraries to our executable:</b>
target_link_libraries(mycompiler ${REQ_LLVM_LIBRARIES})
</pre>
</div>
<p>This assumes that LLVM_ROOT points to an install of LLVM. The
procedure works too for uninstalled builds although we need to take
care to add an <i>include_directories</i> for the location of the
headers on the LLVM source directory (if we are building
out-of-source.)</p>
</div>
@ -383,7 +414,7 @@
<a href="mailto:ofv@wanadoo.es">Oscar Fuentes</a><br>
<a href="http://llvm.org">LLVM Compiler Infrastructure</a><br>
Last modified: $Date: 2008-12-31 03:59:36 +0100 (Wed, 31 Dec 2008) $
Last modified: $Date: 2010-08-09 03:59:36 +0100 (Mon, 9 Aug 2010) $
</address>
</body>