From 3999d26ead93990b244ada078073fb58fb8bb5be Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Thu, 5 Feb 2015 15:52:20 -0800
Subject: Add ersatz _Static_assert on older C hosts

* misc/sys/cdefs.h (_Static_assert): Define a substitute, if on a
pre-C11 C platform that is not known to support _Static_assert.
---
 misc/sys/cdefs.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'misc')

diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 09ee352e1f..99e94cce86 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -399,6 +399,14 @@
 # endif
 #endif
 
+#if (!defined _Static_assert && !defined __cplusplus \
+     && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \
+     && (!__GNUC_PREREQ (4, 6) || defined __STRICT_ANSI__))
+# define _Static_assert(expr, diagnostic) \
+    extern int (*__Static_assert_function (void)) \
+      [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })]
+#endif
+
 #include <bits/wordsize.h>
 
 #if defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH
-- 
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