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lib: make freestanding memset() et al. symbols "weak"

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This allows these symbols to be overridden by another definition of
these symbols somewhere else in the binary.

Resolves https://github.com/ebiggers/libdeflate/issues/107
This commit is contained in:
Eric Biggers 2020-11-20 15:03:11 -08:00
parent e2f9d07050
commit 4a0bb736c9
1 changed files with 8 additions and 4 deletions
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12
lib/utils.c
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@ -85,7 +85,8 @@ libdeflate_set_memory_allocator(void *(*malloc_func)(size_t),
*/ */
#ifdef FREESTANDING #ifdef FREESTANDING
#undef memset #undef memset
void *memset(void *s, int c, size_t n) void * __attribute__((weak))
memset(void *s, int c, size_t n)
{ {
u8 *p = s; u8 *p = s;
size_t i; size_t i;
@ -96,7 +97,8 @@ void *memset(void *s, int c, size_t n)
} }
#undef memcpy #undef memcpy
void *memcpy(void *dest, const void *src, size_t n) void * __attribute__((weak))
memcpy(void *dest, const void *src, size_t n)
{ {
u8 *d = dest; u8 *d = dest;
const u8 *s = src; const u8 *s = src;
@ -108,7 +110,8 @@ void *memcpy(void *dest, const void *src, size_t n)
} }
#undef memmove #undef memmove
void *memmove(void *dest, const void *src, size_t n) void * __attribute__((weak))
memmove(void *dest, const void *src, size_t n)
{ {
u8 *d = dest; u8 *d = dest;
const u8 *s = src; const u8 *s = src;
@ -123,7 +126,8 @@ void *memmove(void *dest, const void *src, size_t n)
} }
#undef memcmp #undef memcmp
int memcmp(const void *s1, const void *s2, size_t n) int __attribute__((weak))
memcmp(const void *s1, const void *s2, size_t n)
{ {
const u8 *p1 = s1; const u8 *p1 = s1;
const u8 *p2 = s2; const u8 *p2 = s2;