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[libcxx] cmake - guard list remove 

REMOVE_ITEM fails if CMAKE_REQUIRED_LIBRARIES is empty on some
versions of cmake.

llvm-svn: 359755
This commit is contained in:
Brian Cain 2019-05-02 03:49:50 +00:00
parent f2baae0abb
commit 9d744bcde9
1 changed files with 6 additions and 4 deletions
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10
libcxx/cmake/Modules/CheckLibcxxAtomic.cmake
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@ -34,10 +34,12 @@ endfunction(check_cxx_atomics)
# Perform the check for 64bit atomics without libatomic. It may have been
# added to the required libraries during in the configuration of LLVM, which
# would cause the check for CXX atomics without libatomic to incorrectly pass.
set(OLD_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
list(REMOVE_ITEM CMAKE_REQUIRED_LIBRARIES "atomic")
check_cxx_atomics(LIBCXX_HAVE_CXX_ATOMICS_WITHOUT_LIB)
set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES})
if (CMAKE_REQUIRED_LIBRARIES)
set(OLD_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
list(REMOVE_ITEM CMAKE_REQUIRED_LIBRARIES "atomic")
check_cxx_atomics(LIBCXX_HAVE_CXX_ATOMICS_WITHOUT_LIB)
set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQUIRED_LIBRARIES})
endif()
check_library_exists(atomic __atomic_fetch_add_8 "" LIBCXX_HAS_ATOMIC_LIB)
# If not, check if the library exists, and atomics work with it.