https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67661
--- Comment #2 from leechung <leechung at 126 dot com> ---
(In reply to jos...@codesourcery.com from comment #1)
> You'll need to give a full testcase (complete compilable file and options
> used to compile it). What you gave isn't a compilable testcase; it gives
> "error: variably modified 'y' at file scope". Put inside a function, it
> gives "warning: unused variable 'y' [-Wunused-variable]", but does not
> give the warning you mention. And there's no variable 'b' in your example
> at all.
Sorry, I am less experience.
The following is the complete code:
#include <stdio.h>
int main (void)
{
int x = 0, y [++ x], z [++ x];
printf ("%d, %d, %d\n", sizeof x, sizeof y, sizeof z);
return 0;
}
and are compiled with option '-Wall'.for example:
gcc xx.c -Wall
then produce a warning 'operation on 'x' may be undefined [-Wsequence-point]'
