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tools/nolibc/string: export memset() and memmove()

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"clang -Os" and "gcc -Ofast" without -ffreestanding may ignore memset()
and memmove(), hoping to provide their builtin equivalents, and finally
not find them. Thus we must export these functions for these rare cases.
Note that as they're set in their own sections, they will be eliminated
by the linker if not used. In addition, they do not prevent gcc from
identifying them and replacing them with the shorter "rep movsb" or
"rep stosb" when relevant.

Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Willy Tarreau 2022-02-07 17:23:47 +01:00 committed by Paul E. McKenney
parent 023033fe34
commit 8d304a3740
1 changed files with 8 additions and 2 deletions
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10
tools/include/nolibc/string.h
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@ -47,7 +47,10 @@ void *_nolibc_memcpy_down(void *dst, const void *src, size_t len)
return dst;
}
static __attribute__((unused))
/* might be ignored by the compiler without -ffreestanding, then found as
* missing.
*/
__attribute__((weak,unused,section(".text.nolibc_memmove")))
void *memmove(void *dst, const void *src, size_t len)
{
size_t dir, pos;
@ -75,7 +78,10 @@ void *memcpy(void *dst, const void *src, size_t len)
return _nolibc_memcpy_up(dst, src, len);
}
static __attribute__((unused))
/* might be ignored by the compiler without -ffreestanding, then found as
* missing.
*/
__attribute__((weak,unused,section(".text.nolibc_memset")))
void *memset(void *dst, int b, size_t len)
{
char *p = dst;