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author | des <des@FreeBSD.org> | 2003-06-15 11:01:52 +0000 |
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committer | des <des@FreeBSD.org> | 2003-06-15 11:01:52 +0000 |
commit | e6811cdce978450f1460814b6644197937ffd4d4 (patch) | |
tree | 0f9873860d2ca4f753ac7b3426a2279c58d29f87 /include/stdlib.h | |
parent | 8bb15f6592a478029c24ef363cf879a01be0c9c3 (diff) | |
download | FreeBSD-src-e6811cdce978450f1460814b6644197937ffd4d4.zip FreeBSD-src-e6811cdce978450f1460814b6644197937ffd4d4.tar.gz |
Use __builtin_alloca() on compilers that have it. Keep the prototype for
the benefit of lint and non-{GNU,Intel} compilers.
Diffstat (limited to 'include/stdlib.h')
-rw-r--r-- | include/stdlib.h | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/include/stdlib.h b/include/stdlib.h index b553744..4bbd438 100644 --- a/include/stdlib.h +++ b/include/stdlib.h @@ -222,7 +222,23 @@ extern const char *_malloc_options; extern void (*_malloc_message)(const char *, const char *, const char *, const char *); -void *alloca(size_t); /* built-in for gcc */ +#ifndef alloca +/* + * The alloca() function can't be implemented in C, and on some + * platforms it can't be implemented at all as a callable function. + * The GNU C compiler provides a built-in alloca() which we can use; + * in all other cases, provide a prototype, mainly to pacify various + * incarnations of lint. On platforms where alloca() is not in libc, + * programs which use it will fail to link when compiled with non-GNU + * compilers. + */ +#if defined(__GNUC__) || defined(__INTEL_COMPILER) +#define alloca(sz) __builtin_alloca(sz) +#else +void *alloca(size_t); +#endif +#endif + __uint32_t arc4random(void); void arc4random_addrandom(unsigned char *dat, int datlen); |