diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/compiler.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 70ed5ef37a4c..e92f4723c1e2 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -25,6 +25,23 @@ #define __deprecated #endif +/* + * Allow us to avoid 'defined but not used' warnings on functions and data, + * as well as force them to be emitted to the assembly file. + * + * As of gcc 3.3, static functions that are not marked with attribute((used)) + * may be elided from the assembly file. As of gcc 3.3, static data not so + * marked will not be elided, but this may change in a future gcc version. + * + * In prior versions of gcc, such functions and data would be emitted, but + * would be warned about except with attribute((unused)). + */ +#if __GNUC__ == 3 && __GNUC_MINOR__ >= 3 || __GNUC__ > 3 +#define __attribute_used__ __attribute__((__used__)) +#else +#define __attribute_used__ __attribute__((__unused__)) +#endif + /* This macro obfuscates arithmetic on a variable address so that gcc shouldn't recognize the original var, and make assumptions about it */ #define RELOC_HIDE(ptr, off) \ |