From 06d43760e4ca2cc7007e54d88938eff9e95e0579 Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Wed, 6 Jun 2018 09:18:10 +0200
Subject: [PATCH] Restore _Atomic define before stdatomic.h for old gcc

see #1593
---
 common.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/common.h b/common.h
index 123e3dee7..ecf07316d 100644
--- a/common.h
+++ b/common.h
@@ -649,12 +649,21 @@ int omp_get_num_procs(void);
 __declspec(dllimport) int __cdecl omp_in_parallel(void);
 __declspec(dllimport) int __cdecl omp_get_num_procs(void);
 #endif
+
 #if (__STDC_VERSION__ >= 201112L)
+#if defined(C_GCC) && ( __GNUC__ < 7) 
+// workaround for GCC bug 65467
 #ifndef _Atomic
 #define _Atomic volatile
 #endif
-#include <stdatomic.h>
 #endif
+#include <stdatomic.h>
+#else
+#ifndef _Atomic
+#define _Atomic volatile
+#endif
+
+
 #else
 #ifdef __ELF__
 int omp_in_parallel  (void) __attribute__ ((weak));