include: [c.h]: add unused attribute to ignore_result()

unfortunately, gcc 4.6

	void fn (void) {
		int foo;
		foo = bar ();
	}

evaluates that foo is never used. The __attribute__((unused)) is
necessary...

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/include/c.h b/include/c.h
index 4bb28875889755a2afdcefded03d620a723d1d84..e52514345b8c2d230998b4316825e8b081744369 100644 (file)
--- a/include/c.h
+++ b/include/c.h
@@ -25,7 +25,9 @@
 # define __must_be_array(a) \
        BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(typeof(a), typeof(&a[0])))
 
-# define ignore_result(x) ({ typeof(x) __dummy = (x); (void) __dummy; })
+# define ignore_result(x) ({ \
+       typeof(x) __dummy __attribute__((__unused__)) = (x); (void) __dummy; \
+})
 
 #else /* !__GNUC__ */
 # define __must_be_array(a)    0