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From: Andriy Gapon <avg@FreeBSD.org>
Date: Wed, 22 Feb 2017 17:20:18 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r314101 - head/sys/sys
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Author: avg
Date: Wed Feb 22 17:20:18 2017
New Revision: 314101
URL: https://svnweb.freebsd.org/changeset/base/314101

Log:
  don't use C99 static array indices with older GCC versions
  
  For example, the FreeBSD GCC (4.2.1) has a spotty support for that
  feature.  If the static keyword is used with an unnamed array parameter
  in a function declaration, then the compilation fails with:
  error: static or type qualifiers in abstract declarator
  
  The feature does work if the parameter is named.
  So, the restriction introduced in this commit can be removed when all
  affected function prototypes have the workaround.
  
  MFC after:	1 week
  Sponsored by:	Panzura

Modified:
  head/sys/sys/cdefs.h

Modified: head/sys/sys/cdefs.h
==============================================================================
--- head/sys/sys/cdefs.h	Wed Feb 22 17:13:00 2017	(r314100)
+++ head/sys/sys/cdefs.h	Wed Feb 22 17:20:18 2017	(r314101)
@@ -349,6 +349,7 @@
  * void bar(int myArray[__min_size(10)]);
  */
 #if !defined(__cplusplus) && \
+    (defined(__clang__) || __GNUC_PREREQ__(4, 6)) && \
     (!defined(__STDC_VERSION__) || (__STDC_VERSION__ >= 199901))
 #define __min_size(x)	static (x)
 #else