Compiler not detecting obviously uninitialized variable

Question

All C compilers I\'ve tried won\'t detect uninitialized variables in the code snippet below. Yet the case is obvious here.

Don\'t bother about the functionality of t

Answer 1

Yes, it should raise a warning about that uninitialized variable, but it's a GCC bug. The example given there is:

unsigned bmp_iter_set ();
int something (void);

void bitmap_print_value_set (void)
{
    unsigned first;

    for (; bmp_iter_set (); )
    {
        if (!first)
            something ();
        first = 0;
    }
}

And diagnosed with -O2 -W -Wall.

Unfortunately, this year is the 10 year anniversary of this bug!