[llvm] 0beeadf - [ORC] Link `atomic` on platforms without hardware support for atomics.

[Lang Hames via llvm-commits]

Author: Owen Shepherd
Date: 2023-04-11T04:15:21Z
New Revision: 0beeadf2035766a1b73bd2aae1df39585e586a5c

URL: https://github.com/llvm/llvm-project/commit/0beeadf2035766a1b73bd2aae1df39585e586a5c
DIFF: https://github.com/llvm/llvm-project/commit/0beeadf2035766a1b73bd2aae1df39585e586a5c.diff

LOG: [ORC] Link `atomic` on platforms without hardware support for atomics.

Fixes error about missing reference to __atomic_fetch_add_8 when linking
LLVMOrcJit on ARMv6.

Reviewed By: lhames

Differential Revision: https://reviews.llvm.org/D147937

Added: 
    

Modified: 
    llvm/lib/ExecutionEngine/Orc/CMakeLists.txt

Removed: 
    


################################################################################
diff  --git a/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt b/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt
index 1d4c14625a3e6..1055e316cc733 100644
--- a/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt
+++ b/llvm/lib/ExecutionEngine/Orc/CMakeLists.txt
@@ -1,3 +1,7 @@
+if (NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB)
+  set (atomic_lib atomic)
+endif()
+
 if( CMAKE_HOST_UNIX AND HAVE_LIBRT )
   set(rt_lib rt)
 endif()
@@ -53,6 +57,7 @@ add_llvm_component_library(LLVMOrcJIT
   LINK_LIBS
   ${LLVM_PTHREAD_LIB}
   ${rt_lib}
+  ${atomic_lib}
 
   LINK_COMPONENTS
   Core