[Bug c/51542] New: bootstrap failure due to uninitialized variable use in c-parser

[Bug c/51542] New: bootstrap failure due to uninitialized variable use in c-parser

[matt at use dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51542

             Bug #: 51542
           Summary: bootstrap failure due to uninitialized variable use in
                    c-parser
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: matt@use.net


I checked by hand, and this looks real to me. It doesn't come up without
-O[3,fast] and LTO probably due to a lack of inlining that limits visibility of
the analysis.

NOTE: I have hand-modified my build/bootstrap-lto.mk to use -Ofast

$ ~/src/gcc-trunk/configure --enable-bootstrap --prefix=/home/matt
--enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --enable-lto
--with-fpmath=sse --enable-languages=c,c++,lto
--with-build-config=bootstrap-lto --enable-build-with-cxx --disable-libmudflap
--with-cpu=core2 --with-tune=core2 --disable-libssp

$ make -j7 profiledbootstrap

/home/matt/src/gcc-trunk/gcc/c-parser.c: In function ‘c_expr
c_parser_postfix_expression_after_primary(c_parser*, location_t, c_expr)’:
/home/matt/src/gcc-trunk/gcc/c-parser.c:6880:16: error: ‘origtypes’ may be used
uninitialized in this function [-Werror=maybe-uninitialized]

[Bug c/51542] bootstrap failure due to uninitialized variable use in c-parser

[d.g.gorbachev at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51542

--- Comment #1 from Dmitry Gorbachev <d.g.gorbachev at gmail dot com> 2011-12-14 05:17:04 UTC ---
PR 50148.

[Bug c/51542] bootstrap failure due to uninitialized variable use in c-parser

[marc.glisse at normalesup dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51542

Marc Glisse <marc.glisse at normalesup dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marc.glisse at normalesup
                   |                            |dot org

--- Comment #2 from Marc Glisse <marc.glisse at normalesup dot org> 2011-12-14 22:22:41 UTC ---
And PR 44938 before that.

[Bug c/51542] bootstrap failure due to uninitialized variable use in c-parser

[matt at use dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51542

--- Comment #3 from Matt Hargett <matt at use dot net> 2012-01-23 19:16:12 UTC ---
As I mentioned in the other bug, the specific optimization from -O3 that
triggers this if -fipa-cp-clone.

Is there a reason these patches haven't been applied? Bootstrapping the
compiler with -O3 is a great way to test and find issues before a release, but
it's not feasible right now due to this issue.

At the very least, since it has been reproduced and acknowledged, can the
status be upgraded from 'unconfirmed'?