From b26b32b5d3b85812a12f5e3bf011428612f78e19 Mon Sep 17 00:00:00 2001
From: Josh Stone <jistone@redhat.com>
Date: Mon, 17 Aug 2020 15:31:32 -0700
Subject: [PATCH] lld: link libatomic if needed for Timer

D80298 made Timer::total atomic, but this requires linking libatomic
on some targets.

Reviewed By: aaronpuchert

Differential Revision: https://reviews.llvm.org/D85691
---
 lld/CMakeLists.txt        | 1 +
 lld/Common/CMakeLists.txt | 8 +++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/lld/CMakeLists.txt b/lld/CMakeLists.txt
index e9bd1bd29c5c..7dae682cdef0 100644
--- a/lld/CMakeLists.txt
+++ b/lld/CMakeLists.txt
@@ -54,6 +54,7 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
   include(AddLLVM)
   include(TableGen)
   include(HandleLLVMOptions)
+  include(CheckAtomic)
 
   if(LLVM_INCLUDE_TESTS)
     if(CMAKE_VERSION VERSION_LESS 3.12)
diff --git a/lld/Common/CMakeLists.txt b/lld/Common/CMakeLists.txt
index 212328b784c5..bfa4f7b8ee58 100644
--- a/lld/Common/CMakeLists.txt
+++ b/lld/Common/CMakeLists.txt
@@ -1,3 +1,9 @@
+set(LLD_SYSTEM_LIBS ${LLVM_PTHREAD_LIB})
+
+if(NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB)
+  list(APPEND LLD_SYSTEM_LIBS atomic)
+endif()
+
 find_first_existing_vc_file("${LLVM_MAIN_SRC_DIR}" llvm_vc)
 find_first_existing_vc_file("${LLD_SOURCE_DIR}" lld_vc)
 
@@ -50,7 +56,7 @@ add_lld_library(lldCommon
   Target
 
   LINK_LIBS
-  ${LLVM_PTHREAD_LIB}
+  ${LLD_SYSTEM_LIBS}
 
   DEPENDS
   intrinsics_gen