[Bug c/38274] New: why the option "-fstack-protector-all" doesn't works?

["zuogang at huawei dot com" <gcc-bugzilla at gcc dot gnu dot org>]

source file:
#include <stdio.h>

int main(void)
{
        char a = 1;
        int b = 2;
        short c = 3;
        char sztmp[22] = "hello worlds!";

        *(int *)&a=0xffff;

        sztmp[22]=0;
        printf("%s,a:%d,b%d\n",sztmp,a,b);

        return 0;
}

invoke gcc by :gcc  -fstack-protector-all test.c;

after my debugging a.out, I find the gcc doesn't adding a guard variable to
functions's local stack vars, and the var "sztmp" follows var "a" and there
aren't any room between the two vars.


-- 
           Summary: why the option "-fstack-protector-all" doesn't works?
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: zuogang at huawei dot com
  GCC host triplet: x86, SUSE 10 ES,
GCC target triplet: X86


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38274