From 9e21a100e32059adf102b300d2f52085cc25adb3 Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Mon, 20 Jul 2020 22:52:09 +0000
Subject: [PATCH] Add trivial check for stdatomic.h

---
 cmake/system_check.cmake | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/cmake/system_check.cmake b/cmake/system_check.cmake
index 94eb0a9c6..4382ffc4e 100644
--- a/cmake/system_check.cmake
+++ b/cmake/system_check.cmake
@@ -116,3 +116,10 @@ set (CCOMMON_OPT "${CCOMMON_OPT} -DNO_AVX512")
 endif()
   file(REMOVE "avx512.c" "avx512.o")
 endif()
+
+include(CheckIncludeFile)
+CHECK_INCLUDE_FILE("stdatomic.h" HAVE_C11)
+if (HAVE_C11 EQUAL 1)
+message (STATUS found stdatomic.h)
+set (CCOMMON_OPT "${CCOMMON_OPT} -DHAVE_C11")
+endif()