From 6dcb26d21ed116016f0f3ee7630f532a70a66b79 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Sat, 19 Mar 2022 18:19:44 -0400
Subject: Fix test for whether atomic library is needed

Some platforms need it for atomic<long long> but not for atomic<int>.
---
 CMakeLists.txt | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'CMakeLists.txt')

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d58f76c9..33ff69aa 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -154,6 +154,7 @@ if(WIN32 AND NOT SKIP_OS_SECURE_RANDOM)
 endif()
 
 include(CheckCXXSourceCompiles)
+set(ATOMIC_LIBRARY)
 function(check_atomic)
   foreach(I 0 1)
     if(I)
@@ -162,8 +163,8 @@ function(check_atomic)
     check_cxx_source_compiles(
       "#include <atomic>
 int main() {
-    static std::atomic<int> a{0};
-    a = a.fetch_add(1);
+    static std::atomic<unsigned long long> a{0};
+    a = a.fetch_add(1LL);
     return 0;
 }"
       ATOMIC_WORKED${I})
@@ -172,7 +173,7 @@ int main() {
     endif()
   endforeach()
   if(ATOMIC_WORKED1)
-    list(APPEND CMAKE_REQUIRED_LIBRARIES atomic)
+    set(ATOMIC_WORKED1 atomic PARENT_SCOPE)
   endif()
 endfunction()
 check_atomic()
-- 
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