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compiler: introduce __used and __maybe_unused

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__used is defined to be __attribute__((unused)) for all pre-3.3 gcc
compilers to suppress warnings for unused functions because perhaps they
are referenced only in inline assembly.  It is defined to be
__attribute__((used)) for gcc 3.3 and later so that the code is still
emitted for such functions.

__maybe_unused is defined to be __attribute__((unused)) for both function
and variable use if it could possibly be unreferenced due to the evaluation
of preprocessor macros.  Function prototypes shall be marked with
__maybe_unused if the actual definition of the function is dependant on
preprocessor macros.

No update to compiler-intel.h is necessary because ICC supports both
__attribute__((used)) and __attribute__((unused)) as specified by the gcc
manual.

__attribute_used__ is deprecated and will be removed once all current
code is converted to using __used.

Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes 2007-05-09 02:35:27 -07:00 • committed by Linus Torvalds
parent f7e4217b00
commit 0d7ebbbc6e
4 changed files with 25 additions and 6 deletions
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6
include/linux/compiler-gcc3.h
View file

@ -4,9 +4,11 @@
#include <linux/compiler-gcc.h>
#if __GNUC_MINOR__ >= 3
# define __attribute_used__ __attribute__((__used__))
# define __used __attribute__((__used__))
# define __attribute_used__ __used /* deprecated */
#else
# define __attribute_used__ __attribute__((__unused__))
# define __used __attribute__((__unused__))
# define __attribute_used__ __used /* deprecated */
#endif
#if __GNUC_MINOR__ >= 4