[PATCH] D111782: [AIX][cmake] Set atomics related macros when build with xlclang

[Kai Luo via Phabricator via llvm-commits]

lkail created this revision.
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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.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D111782

Files:
  llvm/cmake/modules/CheckAtomic.cmake


Index: llvm/cmake/modules/CheckAtomic.cmake
===================================================================
--- llvm/cmake/modules/CheckAtomic.cmake
+++ llvm/cmake/modules/CheckAtomic.cmake
@@ -43,7 +43,7 @@
 # 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 "XLClang")
   # 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 @@
 # 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 MATCHES "XLClang")
   # 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.


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