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From: "fredrik at hederstierna dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/38945]  New: No warning when using unset variable
Date: Fri, 23 Jan 2009 14:36:00 -0000	[thread overview]
Message-ID: <bug-38945-11352@http.gcc.gnu.org/bugzilla/> (raw)

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


             reply	other threads:[~2009-01-23 14:36 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-01-23 14:36 fredrik at hederstierna dot com [this message]
2009-01-24 16:05 ` [Bug c/38945] No warning when using uninitialized variable manu at gcc dot gnu dot org
2009-01-26 19:27 ` pinskia at gcc dot gnu dot org

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