[Bug middle-end/29171] forgotten memcpy with -ffreestanding -fwhole-program --combine

[acahalan at gmail dot com]

------- Comment #3 from acahalan at gmail dot com  2006-09-21 18:49 -------
foo 0 $ cat foo.c
void *memcpy(void *restrict, const void *restrict, unsigned long);
void *memcpy(void *restrict dst, const void *restrict src, unsigned long n)
{
        const char *p = src;
        char *q = dst;
        while (n--) {
                *q++ = *p++;
        }
        return dst;
}
typedef struct S {
        int a[42];
}S;
void __attribute__((used,unused)) _fini(void)
{
        S *s1;
        S *s2;
        __asm__ __volatile__("":"=r"(s1)::"memory");
        __asm__ __volatile__("":"=r"(s2)::"memory");
        *s1 = *s2;
        __asm__ __volatile__(""::"r"(s1):"memory");
        __asm__ __volatile__(""::"r"(s2):"memory");
}
foo 0 $ make
gcc -m32 -std=gnu99 -nostdinc -fPIC -Os -fvisibility=hidden -W -Wall -g3
-ffreestanding -fwhole-program --combine -c foo.c -o bigblob.pic
rm -f tmp.so testcase.so.1.0.1
gcc -m32 -shared -nostartfiles -nodefaultlibs -nostdlib -o tmp.so bigblob.pic 
if nm tmp.so | grep -i --color=auto '.* u .*' ; then false ; else true ; fi
         U memcpy
make: *** [testcase.so.1.0.1] Error 1
foo 2 $ 


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29171