[llvm] d4a4a32 - [Support] Check for atomics64 when deciding if '-latomic' is needed

[Luís Marques via llvm-commits]

Author: Gokturk Yuksek
Date: 2020-02-18T07:54:54Z
New Revision: d4a4a32cd94eccbaaa4608b0daac8b820e041214

URL: https://github.com/llvm/llvm-project/commit/d4a4a32cd94eccbaaa4608b0daac8b820e041214
DIFF: https://github.com/llvm/llvm-project/commit/d4a4a32cd94eccbaaa4608b0daac8b820e041214.diff

LOG: [Support] Check for atomics64 when deciding if '-latomic'  is needed

The CheckAtomic module performs two tests to determine if passing
'-latomic' to the linker is required: one for 64-bit atomics, and
another for non-64-bit atomics. Include the missing check for 64-bit
atomics.

Reviewers: beanz, compnerd
Reviewed By: beanz, compnerd
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D69444

Added: 
    

Modified: 
    llvm/lib/Support/CMakeLists.txt

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Support/CMakeLists.txt b/llvm/lib/Support/CMakeLists.txt
index 26332d4f539c..41c5258d0b2b 100644
--- a/llvm/lib/Support/CMakeLists.txt
+++ b/llvm/lib/Support/CMakeLists.txt
@@ -26,7 +26,7 @@ elseif( CMAKE_HOST_UNIX )
       set(system_libs ${system_libs} ${TERMINFO_LIBS})
     endif()
   endif()
-  if( LLVM_ENABLE_THREADS AND HAVE_LIBATOMIC )
+  if( LLVM_ENABLE_THREADS AND (HAVE_LIBATOMIC OR HAVE_CXX_LIBATOMICS64) )
     set(system_libs ${system_libs} atomic)
   endif()
   set(system_libs ${system_libs} ${LLVM_PTHREAD_LIB})