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Provide bootstrap support to build only llvm+clang when using cmake.

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Where a source tree is complete with lld, lldb and polly, it may not be possible to use cmake to configure build scripts if the host compiler it not capable of compiling these sub-projects.  This change makes it possible to first build a bootstrap clang compiler when can then be used to build a complete llvm toolchain.  An example bootstrap build sequence could be as follows:

$ mkdir bootstrap
$ cd bootstrap
$ cmake -G 'Unix Makefiles'
        -DCMAKE_BUILD_TYPE:STRING=Release
        -DCMAKE_PREFIX_PATH:STRING=$(pwd)
        -DLLVM_TARGETS_TO_BUILD:STRING=host
        -DLLVM_INCLUDE_TOOLS:STRING=bootstrap-only
        ../source
$ make clang  # build clang only for host

$ cd ..
$ export CC=$(realpath bootstrap/bin)/clang
$ export CXX=$(realpath bootstrap/bin)/clang++

$ mkdir final
$ cd final
$ cmake -G 'Unix Makefiles' ../source
$ make all check-all


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184924 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andy Gibbs 2013-06-26 08:05:08 +00:00
parent 84bb3a2af2
commit 0259c0cde5
1 changed files with 6 additions and 3 deletions
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9
tools/CMakeLists.txt
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@ -58,8 +58,11 @@ if( LLVM_ENABLE_PIC )
endif()
add_llvm_external_project(clang)
add_llvm_external_project(lld)
add_llvm_external_project(lldb)
add_llvm_external_project(polly)
if( NOT LLVM_INCLUDE_TOOLS STREQUAL "bootstrap-only" )
add_llvm_external_project(lld)
add_llvm_external_project(lldb)
add_llvm_external_project(polly)
endif()
set(LLVM_COMMON_DEPENDS ${LLVM_COMMON_DEPENDS} PARENT_SCOPE)