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[Bug middle-end/7776] const char* p = "foo"; if (p == "foo") ... is compiled without warning!
- From: "pluto at agmk dot net" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 24 Jun 2005 13:50:55 -0000
- Subject: [Bug middle-end/7776] const char* p = "foo"; if (p == "foo") ... is compiled without warning!
- References: <20020830090600.7776.udbz@rz.uni-karlsruhe.de>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From pluto at agmk dot net 2005-06-24 13:50 -------
(In reply to comment #10)
> (In reply to comment #9)
> > A revised patch, allowing equality and inequality comparisons against
NULL,
> yet
> > retaining warnings for things like 'if ("foo" > 0)' and 'if ("foo" ==
> "bar")'
> > was posted here: http://gcc.gnu.org/ml/gcc-patches/2005-06/msg01177.html
> >
>
> with this patch I get an ice at amd64:
>
> (..)
> -c ../../gcc/unwind-dw2.c -o libgcc/./unwind-dw2.o
>
> In file included from ../../gcc/unwind-dw2.c:256:
> ../../gcc/config/i386/linux-unwind.h:
> In function 'x86_64_fallback_frame_state':
> ../../gcc/config/i386/linux-unwind.h:55: warning: dereferencing type-punned
> pointer will break strict-aliasing rules
> ../../gcc/unwind.inc: In function '_Unwind_ForcedUnwind':
> ../../gcc/unwind.inc:215: internal compiler error: in create_pre_exit,
> at mode-switching.c:350
>
oops, sorry. i've posted above in wrong PR.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=7776