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boot: Mark memcmp/memcpy/memset aliases as used

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The compiler may emit calls to these but also optimize the function away
somehow, breaking at link stage. Marking them as used prevents this.
This commit is contained in:
Jan Janssen 2022-06-10 15:20:01 +02:00
parent 67bca872ea
commit 2b0af8e76a
1 changed files with 7 additions and 5 deletions
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12
src/boot/efi/efi-string.c
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@ -294,9 +294,11 @@ void *efi_memset(void *p, int c, size_t n) {
# undef memcmp
# undef memcpy
# undef memset
/* Provide the actual implementation for the builtins. To prevent a linker error, we mark memcpy/memset as
* weak, because gnu-efi is currently providing them. */
__attribute__((alias("efi_memcmp"))) int memcmp(const void *p1, const void *p2, size_t n);
__attribute__((weak, alias("efi_memcpy"))) void *memcpy(void * restrict dest, const void * restrict src, size_t n);
__attribute__((weak, alias("efi_memset"))) void *memset(void *p, int c, size_t n);
/* Provide the actual implementation for the builtins by providing aliases. These need to be marked as used,
* as otherwise the compiler might remove them but still emit calls, which would break when linking.
* To prevent a different linker error, we mark memcpy/memset as weak, because gnu-efi is currently
* providing them. */
__attribute__((used, alias("efi_memcmp"))) int memcmp(const void *p1, const void *p2, size_t n);
__attribute__((used, weak, alias("efi_memcpy"))) void *memcpy(void * restrict dest, const void * restrict src, size_t n);
__attribute__((used, weak, alias("efi_memset"))) void *memset(void *p, int c, size_t n);
#endif