From 7397f2c1f955569743c68c900ca873fd9e211833 Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Fri, 22 Jan 2021 13:28:02 +0100
Subject: [PATCH] build-sys: add restrict keyword fallback

Signed-off-by: Karel Zak <kzak@redhat.com>
---
 include/c.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/c.h b/include/c.h
index ae0813109..6b742512b 100644
--- a/include/c.h
+++ b/include/c.h
@@ -64,6 +64,21 @@
 # define ignore_result(x) ((void) (x))
 #endif /* !__GNUC__ */
 
+
+/* "restrict" keyword fallback */
+#if __STDC__ != 1
+# define restrict __restrict /* use implementation __ format */
+#else
+# ifndef __STDC_VERSION__
+#  define restrict __restrict /* use implementation __ format */
+# else
+#  if __STDC_VERSION__ < 199901L
+#   define restrict __restrict /* use implementation __ format */
+#  endif
+# endif
+#endif
+
+
 /*
  * It evaluates to 1 if the attribute/feature is supported by the current
  * compilation target. Fallback for old compilers.