#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