Confusing location of error in source code

[Alejandro Colomar via Gcc]

Hi!

I've been confused for some time with a compilation error that
pointed to a slightly-off location.  I wasn't seeing that I used
a temporary variable in a constant expression.  The code could be
reduced to:

$ cat const.c 
int
main(void)
{
        int x = 42;

        _Static_assert(0 || 7 > x, "");
}
$ cc -Wall -Wextra const.c 
const.c: In function ‘main’:
const.c:6:26: error: expression in static assertion is not constant
    6 |         _Static_assert(0 || 7 > x, "");
      |                        ~~^~~~~~~~


I think the appropriate error report should point to this other point:


    6 |         _Static_assert(0 || 7 > x, "");
      |                        ~~~~~~~~~^

Cheers,
Alex

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