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| author | Rich Felker <dalias@aerifal.cx> | 2011-04-27 23:41:48 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-04-27 23:41:48 -0400 |
| commit | def0af189871a499efdc9bc37438d8b20eb702ab (patch) | |
| tree | d63aa5d2b91fd1dfc6098f41871eb582f4da5655 /include | |
| parent | e6bac87d0eaab116878a04874bc5b6a3496cb938 (diff) | |
| download | musl-def0af189871a499efdc9bc37438d8b20eb702ab.tar.gz musl-def0af189871a499efdc9bc37438d8b20eb702ab.tar.bz2 musl-def0af189871a499efdc9bc37438d8b20eb702ab.tar.xz musl-def0af189871a499efdc9bc37438d8b20eb702ab.zip | |
use compiler builtins for variadic macros when available
this slightly cuts down on the degree musl "fights with" gcc, but more
importantly, it fixes a critical bug when gcc inlines a variadic
function and optimizes out the variadic arguments due to noticing that
they were "not used" (by __builtin_va_arg).
we leave the old code in place if __GNUC__ >= 3 is false; it seems
like it might be necessary at least for tinycc support and perhaps if
anyone ever gets around to fixing gcc 2.95.3 enough to make it work..
Diffstat (limited to 'include')
| -rw-r--r-- | include/stdarg.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/stdarg.h b/include/stdarg.h index 2e18e5f5..60d4e2af 100644 --- a/include/stdarg.h +++ b/include/stdarg.h @@ -9,7 +9,14 @@ extern "C" { #include <bits/alltypes.h> +#if __GNUC__ >= 3 +#define va_start(v,l) __builtin_va_start(v,l) +#define va_end(v) __builtin_va_end(v) +#define va_arg(v,l) __builtin_va_arg(v,l) +#define va_copy(d,s) __builtin_va_copy(d,s) +#else #include <bits/stdarg.h> +#endif #ifdef __cplusplus } |