CMake build fails with LLVM in a subdirectory

[llvmbot]

Bugzilla Link	3072
Resolution	FIXED
Resolved on	Nov 16, 2008 11:50
Version	unspecified
OS	Linux
Reporter	LLVM Bugzilla Contributor

Extended Description

Building LLVM with CMake fails if LLVM's top-level CMake file is not the top-level CMake file of the build.

To reproduce:

$ mkdir test
$ cd test
$ svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm
$ echo "add_subdirectory(llvm)" >CMakeLists.txt
$ cd ..
$ mkdir test_build
$ cd test_build
$ cmake ../test
$ make

The error message:

[ 94%] Built target llvm-config.target
llvm/tools/opt/CMakeFiles/opt.dir/build.make:44: tools/opt/CMakeFiles/opt.dir/depend.make: No such file or directory
llvm/tools/opt/CMakeFiles/opt.dir/build.make:47: tools/opt/CMakeFiles/opt.dir/progress.make: No such file or directory
llvm/tools/opt/CMakeFiles/opt.dir/build.make:50: tools/opt/CMakeFiles/opt.dir/flags.make: No such file or directory
make[2]: *** No rule to make target `tools/opt/CMakeFiles/opt.dir/flags.make'. Stop.
make[1]: *** [llvm/tools/opt/CMakeFiles/opt.dir/all] Error 2
make: *** [all] Error 2

Note: I didn't use "svn co" but copied the directory from another SVN checkout. In theory this shouldn't make a difference. (The SVN revision I used was 59362)

[llvmbot]

assigned to @oscarfv

[oscarfv]

Please try this:

In llvm/toos/llvm-config/CMakeLists.txt replace

COMMAND cd ${LLVM_BINARY_DIR} && ${CMAKE_COMMAND} -U HAVE_LLVM_CONFIG ${LLVM_MAIN_SRC_DIR}

with

COMMAND cd ${CMAKE_BINARY_DIR} && ${CMAKE_COMMAND} -U HAVE_LLVM_CONFIG${CMAKE_SOURCE_DIR}

I'm not sure it is 100% right.

[oscarfv]

Oh, how wonderful is to edit text on webforms! :-/

In the previous message there was a missing white space. Please separate
HAVE_LLVM_CONFIG from ${CMAKE_SOURCE_DIR}

I promise next time I'll attach a patch file :-)

[llvmbot]

The fix for this bug.
Your solution worked for me. I added it to this bug as a patch. Thanks.

[oscarfv]

No need to apply the patch. It was committed to svn yestereday.