Index: llvm-toolchain-snapshot_14~++20210805101753+11565320fd55/lld/tools/lld/CMakeLists.txt
===================================================================
--- llvm-toolchain-snapshot_14~++20210805101753+11565320fd55.orig/lld/tools/lld/CMakeLists.txt
+++ llvm-toolchain-snapshot_14~++20210805101753+11565320fd55/lld/tools/lld/CMakeLists.txt
@@ -1,10 +1,18 @@
+set(LLD_ATOMIC_LIB "")
+
 set(LLVM_LINK_COMPONENTS
   Support
   )
 
+if(CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "i386" OR
+    CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "i686" OR
+    CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64" OR CMAKE_SYSTEM_PROCESSOR STREQUAL "amd64"
+  )
+  list(APPEND LLD_ATOMIC_LIB "atomic")
+endif()
+
 add_lld_tool(lld
   lld.cpp
-
   SUPPORT_PLUGINS
   )
 export_executable_symbols_for_plugins(lld)
@@ -18,6 +26,7 @@ target_link_libraries(lld
   lldMachO
   lldMinGW
   lldWasm
+  ${LLD_ATOMIC_LIB}
   )
 
 install(TARGETS lld