Update CMakeLists.txt to fix MacOS build (#14160)

Co-authored-by: sfan5 <sfan5@live.de>

src/CMakeLists.txt

@@ -316,9 +316,14 @@ endif()
 
 # On clang and gcc, some functionalities of std::atomic require -latomic.
 # See <https://en.cppreference.com/w/cpp/atomic/atomic#Notes>.
-if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang"
-		OR CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-	set(PLATFORM_LIBS ${PLATFORM_LIBS} atomic)
+# Note that find_library does not reliably find it so we have to resort to this.
+# Also, passing -latomic is not always the same as adding atomic to the library list.
+include(CheckCSourceCompiles)
+set(CMAKE_REQUIRED_LIBRARIES "-latomic")
+check_c_source_compiles("int main(){}" HAVE_LINK_ATOMIC)
+set(CMAKE_REQUIRED_LIBRARIES "")
+if(HAVE_LINK_ATOMIC)
+	set(PLATFORM_LIBS ${PLATFORM_LIBS} "-latomic")
 endif()
 
 check_include_files(endian.h HAVE_ENDIAN_H)