[Bug c/50669] New: no warning for unused globals

[jg at jguk dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50669

             Bug #: 50669
           Summary: no warning for unused globals
    Classification: Unclassified
           Product: gcc
           Version: 4.5.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jg@jguk.org


I see unused warning for item on stack, but not global variale that is unused.
Could gcc also give warnings for unused globals?

jon@laptop:~$ gcc -Wextra -Wunused -Wall -o main main4.c
main4.c: In function ‘main’:
main4.c:9:6: warning: unused variable ‘unused_flag’


Example program follows:

// gcc -Wextra -Wunused -Wall -o main main4.c


int unused_int;


int main(void)
{
    int unused_flag;

    return 0;
}