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[AIX][cmake] Set atomics related macros when build with xlclang

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Set `HAVE_CXX_ATOMICS_WITHOUT_LIB` or `HAVE_LIBATOMIC` when build LLVM with xlclang. With these macros set, libraries like libLLVMSupport are able to know whether it's necessary to add `-latomic` to dependent system libs. If `HAVE_LIBATOMIC` is set, `llvm-config --system-libs` appends `-latomic` to its output.

Reviewed By: jsji

Differential Revision: https://reviews.llvm.org/D111782
This commit is contained in:
Kai Luo 2021-10-18 09:17:04 +00:00
parent 3d850d03ae
commit 9635168083
1 changed files with 2 additions and 2 deletions
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4
llvm/cmake/modules/CheckAtomic.cmake
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@ -43,7 +43,7 @@ endfunction(check_working_cxx_atomics64)
# Check for (non-64-bit) atomic operations.
if(MSVC)
set(HAVE_CXX_ATOMICS_WITHOUT_LIB True)
elseif(LLVM_COMPILER_IS_GCC_COMPATIBLE)
elseif(LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL")
# First check if atomics work without the library.
check_working_cxx_atomics(HAVE_CXX_ATOMICS_WITHOUT_LIB)
# If not, check if the library exists, and atomics work with it.
@ -64,7 +64,7 @@ endif()
# Check for 64 bit atomic operations.
if(MSVC)
set(HAVE_CXX_ATOMICS64_WITHOUT_LIB True)
elseif(LLVM_COMPILER_IS_GCC_COMPATIBLE)
elseif(LLVM_COMPILER_IS_GCC_COMPATIBLE OR CMAKE_CXX_COMPILER_ID MATCHES "XL")
# First check if atomics work without the library.
check_working_cxx_atomics64(HAVE_CXX_ATOMICS64_WITHOUT_LIB)
# If not, check if the library exists, and atomics work with it.