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From: "markus at trippelsdorf dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug other/55312] New: libbacktrace doesn't honor --disable-werror
Date: Tue, 13 Nov 2012 14:21:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D55312

             Bug #: 55312
           Summary: libbacktrace doesn't honor --disable-werror
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: markus@trippelsdorf.de


When gcc is configured with "--disable-werror" and then build with:

% make -j4 BOOT_CFLAGS=3D"-march=3Dnative -O3 -pipe" STAGE1_CFLAGS=3D"-marc=
h=3Dnative
-O3 -pipe" CFLAGS_FOR_TARGET=3D"-march=3Dnative -O3 -pipe"
CXXFLAGS_FOR_TARGET=3D"-march=3Dnative -O3 -pipe" profiledbootstrap

One gets:
...
/home/markus/gcc/libbacktrace/dwarf.c: In function =E2=80=98build_address_m=
ap=E2=80=99:
/home/markus/gcc/libbacktrace/dwarf.c:1387:13: error: =E2=80=98val.u.string=
=E2=80=99 may be
used uninitialized in this function [-Werror=3Dmaybe-uninitialized]
     lineoff =3D val.u.uint;
...
/home/markus/gcc/libbacktrace/dwarf.c: In function =E2=80=98read_referenced=
_name=E2=80=99:
/home/markus/gcc/libbacktrace/dwarf.c:2078:36: error: =E2=80=98val.u.string=
=E2=80=99 may be
used uninitialized in this function [-Werror=3Dmaybe-uninitialized]
        name =3D read_referenced_name (ddata, u, val.u.uint,
...
checking ctype.h usability... /home/markus/gcc/libbacktrace/dwarf.c: In
function =E2=80=98read_function_entry=E2=80=99:
/home/markus/gcc/libbacktrace/dwarf.c:2329:22: error: =E2=80=98val.u.string=
=E2=80=99 may be
used uninitialized in this function [-Werror=3Dmaybe-uninitialized]
       function->name =3D val.u.string;