[Bug c/57287] New: GCC 4.9.0 fails to build GDB on Ubuntu 12.04

[muhammad_bilal at mentor dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57287

            Bug ID: 57287
           Summary: GCC 4.9.0 fails to build GDB on Ubuntu 12.04
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: muhammad_bilal at mentor dot com

While I was building the latest GDB CVS source code with
gcc (GCC) 4.9.0 20130513 (experimental)
with building step
with building step 

$CC="/home/mbilal/gcc-svn/install/bin/gcc" ./../src/configure
--prefix=/home/mbilal/commit-gdb-cvs/install

$ make

I got errors

 -MF .deps/py-framefilter.Tpo -fno-strict-aliasing -DNDEBUG -fwrapv
.././../src/gdb/python/py-framefilter.c
In file included from .././../src/gdb/python/py-framefilter.c:24:0:
.././../src/gdb/python/py-framefilter.c: In function ‘enumerate_locals’:
.././../src/gdb/exceptions.h:152:31: error: ‘buf’ may be used uninitialized in
this function [-Werror=maybe-uninitialized]
        EXCEPTIONS_SIGJMP_BUF *buf = \
                               ^
.././../src/gdb/exceptions.h:152:31: note: ‘buf’ was declared here
        EXCEPTIONS_SIGJMP_BUF *buf = \
                               ^
.././../src/gdb/python/py-framefilter.c:839:7: note: in expansion of macro
‘TRY_CATCH’
       TRY_CATCH (except, RETURN_MASK_ALL)
       ^
.././../src/gdb/exceptions.h:152:31: error: ‘buf’ may be used uninitialized in
this function [-Werror=maybe-uninitialized]
        EXCEPTIONS_SIGJMP_BUF *buf = \
                               ^
.././../src/gdb/exceptions.h:152:31: note: ‘buf’ was declared here
        EXCEPTIONS_SIGJMP_BUF *buf = \
                               ^
.././../src/gdb/python/py-framefilter.c:782:7: note: in expansion of macro
‘TRY_CATCH’
       TRY_CATCH (except, RETURN_MASK_ALL)
       ^
.././../src/gdb/exceptions.h:152:31: error: ‘buf’ may be used uninitialized in
this function [-Werror=maybe-uninitialized]
        EXCEPTIONS_SIGJMP_BUF *buf = \
                               ^
.././../src/gdb/exceptions.h:152:31: note: ‘buf’ was declared here
        EXCEPTIONS_SIGJMP_BUF *buf = \
                               ^
.././../src/gdb/python/py-framefilter.c:762:4: note: in expansion of macro
‘TRY_CATCH’
    TRY_CATCH (except, RETURN_MASK_ALL)
    ^
.././../src/gdb/python/py-framefilter.c:732:23: error: ‘locals_cleanups’ may be
used uninitialized in this function [-Werror=maybe-uninitialized]
       struct cleanup *locals_cleanups;
                       ^
.././../src/gdb/python/py-framefilter.c:731:11: error: ‘local_indent’ may be
used uninitialized in this function [-Werror=maybe-uninitialized]
       int local_indent = 8 + (8 * indent);
           ^
cc1: all warnings being treated as errors
make[2]: *** [py-framefilter.o] Error 1
make[2]: Leaving directory `/home/mbilal/commit-gdb-cvs/objdir/gdb'
make[1]: *** [all-gdb] Error 2
make[1]: Leaving directory `/home/mbilal/commit-gdb-cvs/objdir'
make: *** [all] Error 2


But something looks really bogus with errors like

.././../src/gdb/python/py-framefilter.c:731:11: error: ‘local_indent’ may be
used uninitialized in this function [-Werror=maybe-uninitialized]
       int local_indent = 8 + (8 * indent);

First I reported a bug on GDB bugzilla
http://sourceware.org/bugzilla/show_bug.cgi?id=15463#c4