Another strict-alias puzzle with (unsigned) char ptrs

[Adam Dickmeiss <adam@xxxxxxxxxxxx>]

The program below prints 1 or 0 depending on GCC version and 
-O2/-fstrict-aliasing being present or not. With proper optimizations 
enabled, 0 is printed. Otherwise, 1 is printed.

So just to understand: strict aliases also take effect for 
signed/unsigned char pointers?
/ Adam


#include <stdio.h>

static void decode_ptr(const unsigned char **src)
{
    (*src)++;
}

int main(int argc, char **argv)
{
    const char *src0 = "";
    const char *src = src0;

    decode_ptr(&src);
    printf("sz = %lld\n", (long long)(src - src0));
}