declared with attribute warn_unused_result". */
#ifndef _GL_IGNORE_VALUE_H
-# define _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 the typeof feature has been available since 2.7 at least. */
-# if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 4)
-# define ignore_value(x) ((void) (x))
-# else
-# define ignore_value(x) (({ __typeof__ (x) __x = (x); (void) __x; }))
-# endif
+#if 3 < __GNUC__ + (4 <= __GNUC_MINOR__)
+# define ignore_value(x) \
+ (__extension__ ({ __typeof__ (x) __x = (x); (void) __x; }))
+#else
+# define ignore_value(x) ((void) (x))
+#endif
#endif