Re: [ft-devel] A few compiler warnings from Mac OS's gcc.

[Alan Coopersmith]

On 03/ 1/14 10:41 AM, suzuki toshiya wrote:
> Hmm. I will try to find any combinations can simulate
> -pedantic except of -Wlong-long.

Can't you just use the -std=c99 flag to tell GCC to only be pedantic
about things not in the now-15-year-old C99 standard, instead of going
back to the older C89?

With this simple test case:

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv)
{
    long long sum = 0;
    int i;

    for (i = 1; i < argc; i++) {
        sum += strtol(argv[i], NULL, 0);
    }

    printf("sum = %lld\n", sum);

    return 0;
}

I get warnings from gcc in default/c89 mode, but not explicit c99 mode:

% /usr/gcc/3.4/bin/gcc -Wall -pedantic -o longlong longlong.c
longlong.c: In function `main':
longlong.c:6: warning: ISO C90 does not support `long long'
longlong.c:13: warning: ISO C90 does not support the `ll' printf length modifier

% /usr/gcc/3.4/bin/gcc -std=c99 -Wall -pedantic -o longlong longlong.c

[no warnings]

gcc 4.7 operates the same for me.

--
        -Alan Coopersmith-              address@hidden
         Oracle Solaris Engineering - http://blogs.oracle.com/alanc