From cc1f708d756c6739fdd59722963d324b865014cd Mon Sep 17 00:00:00 2001
From: Joey Parrish <joeyparrish@google.com>
Date: Thu, 3 Nov 2022 11:18:33 -0700
Subject: [PATCH] Fix misdetection of libatomic with strict compiler flags

With strict flags and -Werror, the detection for libatomic breaks, causing it to be included in places where it is not needed.  And on macOS, this leads to a link error when libatomic cannot be found.

Closes #10899
---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index cab1ff68e0..f60142b207 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -238,7 +238,7 @@ if (NOT MSVC)
   check_cxx_source_compiles("
     #include <atomic>
     int main() {
-      return std::atomic<int64_t>{};
+      return static_cast<int>(std::atomic<int64_t>{});
     }
   " protobuf_HAVE_BUILTIN_ATOMICS)
   if (NOT protobuf_HAVE_BUILTIN_ATOMICS)