+2013-11-28 Paul Eggert <eggert@cs.ucla.edu>
+
+ ignore-value: revert previous code change
+ * lib/ignore-value.h (ignore_value): Use __extension__ and
+ __typeof__ only for GCC 3.4 and later. Reported by Eric Blake in
+ <http://lists.gnu.org/archive/html/bug-gnulib/2013-11/msg00102.html>.
+ Change the comment to try to explain this better.
+
2013-11-27 Pádraig Brady <P@draigBrady.com>
selinux-h: improve stub types and add more stub functions
#ifndef _GL_IGNORE_VALUE_H
#define _GL_IGNORE_VALUE_H
-/* The __attribute__((__warn_unused_result__)) feature is available in
- gcc versions 3.4 and newer, while __typeof__ and __extension__ have
- been available since 2.0 at least. */
-#if 2 <= __GNUC__
+/* Normally casting an expression to void discards its value, but GCC
+ versions 3.4 and newer have __attribute__ ((__warn_unused_result__))
+ which may cause unwanted diagnostics in that case. Use __typeof__
+ and __extension__ to work around the problem, if the workaround is
+ known to be needed. */
+#if 3 < __GNUC__ + (4 <= __GNUC_MINOR__)
# define ignore_value(x) \
(__extension__ ({ __typeof__ (x) __x = (x); (void) __x; }))
#else