[Bug c/38945] New: No warning when using unset variable

[fredrik at hederstierna dot com]

The 4.x compilers does not warn when using unset variables.
The 3.x compilers did warn on this:

Example:

int use_unset_variable(int y)
{
  int x;
  switch(y) {
  case 0:
    x = 0;
    break;
  default:
    break;
  }
  x++;
  return x;
}

Variable x could be unset when returning.
I use all warnings possible:

-Wall -W -Wextra

Best Regards
Fredrik


-- 
           Summary: No warning when using unset variable
           Product: gcc
           Version: 4.3.2
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: fredrik at hederstierna dot com
 GCC build triplet: arm-elf-gcc
  GCC host triplet: x86-intel
GCC target triplet: arm-elf-gcc


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38945