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| author | David Kalnischkies <kalnischkies@gmail.com> | 2009-12-19 14:25:20 +0100 |
|---|---|---|
| committer | David Kalnischkies <kalnischkies@gmail.com> | 2009-12-19 14:25:20 +0100 |
| commit | 7d15572bc3124b15c043e38bdc3d90bcc94f108a (patch) | |
| tree | d68910aafd9e00304596022475fba76e0c6d2365 | |
| parent | 773e2c1fe5fd1a315ffaaf79f2f2e4a9e975649a (diff) | |
add optional gcc features as deprecated, unused and (un)likely
| -rw-r--r-- | apt-pkg/contrib/system.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/apt-pkg/contrib/system.h b/apt-pkg/contrib/system.h index 7ec3d7feb..f68df6265 100644 --- a/apt-pkg/contrib/system.h +++ b/apt-pkg/contrib/system.h @@ -55,4 +55,26 @@ #define CLRFLAG(v,f) ((v) &=~FLAG(f)) #define CHKFLAG(v,f) ((v) & FLAG(f) ? true : false) +// some nice optional GNUC features +#if __GNUC__ >= 3 + #define __must_check __attribute__ ((warn_unused_result)) + #define __deprecated __attribute__ ((deprecated)) + /* likely() and unlikely() can be used to mark boolean expressions + as (not) likely true which will help the compiler to optimise */ + #define likely(x) __builtin_expect (!!(x), 1) + #define unlikely(x) __builtin_expect (!!(x), 0) +#else + #define __must_check /* no warn_unused_result */ + #define __deprecated /* no deprecated */ + #define likely(x) (x) + #define unlikely(x) (x) +#endif + +// cold functions are unlikely() to be called +#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4 + #define __cold __attribute__ ((__cold__)) +#else + #define __cold /* no cold marker */ +#endif + #endif |