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build: check if atomic routines are implicitly provided 

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 671a29d30d
commit 5285c12008
1 changed files with 7 additions and 3 deletions
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10
llvm/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("