Re: Missing warning about uninitialized variable.

[Tom St Denis <tstdenis at ellipticsemi dot com>]

Mikael Vidstedt wrote:
> Just a quick question: Did anybody actually read the subject? My question
> was not about the value of the variable, it was about recent GCC versions no
> longer warn about the use of an uninitialized variable...?
>   

You have to turn on the optimizer to see that.  As I understand it, it's 
only when the optimizer walks down the tree that it picks up the 
uninitialized bit.

-bash-3.00$ gcc -O -Wall -c warn.c
warn.c: In function `main':
warn.c:4: warning: 'g' might be used uninitialized in this function
-bash-3.00$ cat warn.c
#include <stdio.h>
int main(int argc, char **argv)
{
 int g;
 if (argc == 10) { g = 3; }
 printf("g == %d\n", g);
 return 0;
}

Tom