From: Arnd Bergmann <arnd@xxxxxxxx> There is a global definition of memcmp() that gets built on m68k but is never used and causes a warning because of the missing prototype: lib/string.c:671:15: error: no previous prototype for 'memcmp' [-Werror=missing-prototypes] Add the corresponding declaration to avoid the warning. As far as I understand the #define to redirect memcmp() to __builtin_memcmp() does not actually do anything here since this is what it does anyway. Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> --- arch/m68k/include/asm/string.h | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/m68k/include/asm/string.h b/arch/m68k/include/asm/string.h index f0f5021d6327d..760cc13acdf41 100644 --- a/arch/m68k/include/asm/string.h +++ b/arch/m68k/include/asm/string.h @@ -41,6 +41,7 @@ static inline char *strncpy(char *dest, const char *src, size_t n) #define __HAVE_ARCH_MEMMOVE extern void *memmove(void *, const void *, __kernel_size_t); +extern int memcmp(const void *, const void *, __kernel_size_t); #define memcmp(d, s, n) __builtin_memcmp(d, s, n) #define __HAVE_ARCH_MEMSET -- 2.39.2
