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From: "szo at szo dot hu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/51740] New: warning "is used uninitialized in this function" is missing if the variable initialized later
Date: Tue, 03 Jan 2012 14:28:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D51740

             Bug #: 51740
           Summary: warning "is used uninitialized in this function" is
                    missing if the variable initialized later
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: szo@szo.hu


Created attachment 26231
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=3D26231
Code that should warn

gcc fails to emit the "is used uninitialized in this function" warning, if =
the
offending variable is initialized via a function later on.

See attachment. If compiled with=20
gcc  -Wall  bug.c
gcc issues no warning. If line 13 is commented out, the correct
bug.c:11:9: warning: =E2=80=98offender=E2=80=99 is used uninitialized in th=
is function
[-Wuninitialized]
is emitted.
I think it's not the same as #18501, because replacing line 13 with
offencer =3D 0;
still produces the warning correctly.