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[CMake] Fix libomp_check_linker_flag function 

libomp_check_linker_flag rewrites src_to_link.c and CMakeLists.txt in build
directory for test project, but cmake does not rebuild the project. The root
cause is that on some filesystems (ext3, reiserfs) timestamp resoultion is 1
second. So cmake does not rebuild test project if check takes less than 1 second.
This patch puts each test in its own directory to avoid the timestamp problem.

Patch by Chris Bergstrom

http://lists.cs.uiuc.edu/pipermail/openmp-dev/2015-July/000817.html

llvm-svn: 243017
This commit is contained in:
Jonathan Peyton 2015-07-23 14:41:35 +00:00
parent 2ba8374612
commit 77c7898515
1 changed files with 1 additions and 1 deletions
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2
openmp/runtime/cmake/LibompCheckLinkerFlag.cmake
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@ -23,7 +23,7 @@ function(libomp_check_linker_flag flag boolean)
set(CMAKE_SHARED_LINKER_FLAGS \"${flag}\")
add_library(foo SHARED src_to_link.c)")
set(failed_regexes "[Ee]rror;[Uu]nknown;[Ss]kipping;LINK : warning")
set(base_dir ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/link_flag_check)
set(base_dir ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/link_flag_check_${boolean})
file(MAKE_DIRECTORY ${base_dir})
file(MAKE_DIRECTORY ${base_dir}/build)
file(WRITE ${base_dir}/src_to_link.c "${library_source}")