Non-constant expression allowed to dimension array declarations

[Rodney Leadbeater <rodney dot leadbeater at convergys dot com>]

Hi

I was amazed to see that gcc allows the following. It is extremely dangerous
in mixed-ability development teams! Could it not be turned on specifically
with a compiler flag if it has any raison d'etre?

#include <stdio.h>

int i = 20 ;
int j ;

int
main (int argc, char **argv)
{
int a_i [i] ;    // should not be allowed because of the danger
(traditionally use ma
lloc!)
int a_j [j] ;    // very dangerous

        printf ("sizeof a_i = %d\n", sizeof (a_i)) ;
        printf ("sizeof a_j = %d\n", sizeof (a_j)) ;
        return 0 ;
}

Regards


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