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build: check if atomic routines are implicitly provided

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It is possible for the atomic routines to be provided by the compiler without
requiring any additional libraries.  Check if that is the case before checking
for a library.

Patch by Matt Glazar!

llvm-svn: 230452
This commit is contained in:
Saleem Abdulrasool 2015-02-25 02:38:03 +00:00
parent e2587821c4
commit 20506b171b
1 changed files with 7 additions and 3 deletions
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10
cmake/modules/CheckAtomic.cmake
View File

@ -2,9 +2,13 @@
INCLUDE(CheckCXXSourceCompiles)
check_library_exists(atomic __atomic_fetch_add_4 "" HAVE_LIBATOMIC)
if (HAVE_LIBATOMIC)
list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic")
check_function_exists(__atomic_fetch_add_4 HAVE___ATOMIC_FETCH_ADD_4)
if( NOT HAVE___ATOMIC_FETCH_ADD_4 )
check_library_exists(atomic __atomic_fetch_add_4 "" HAVE_LIBATOMIC)
set(HAVE_LIBATOMIC False)
if( HAVE_LIBATOMIC )
list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic")
endif()
endif()
CHECK_CXX_SOURCE_COMPILES("