[Bug c/61861] Incorrect column number for -Wdiscarded-qualifiers

["mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61861

--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
It looks like a pretty old issue.  E.g. on
void
foo (void)
{
  __FILE__;
  "foo";
}

4.8 says:
r.c: In function ‘foo’:
r.c:4:1: warning: statement with no effect [-Wunused-value]
   __FILE__;
 ^
r.c:5:3: warning: statement with no effect [-Wunused-value]
   "foo";
   ^

See how that first caret is off.  I have an untested patch that should fix
this.
>From gcc-bugs-return-456962-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jul 23 11:58:04 2014
Return-Path: <gcc-bugs-return-456962-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Delivered-To: listarch-gcc-bugs@gcc.gnu.org
Received: (qmail 17929 invoked by alias); 23 Jul 2014 11:58:03 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Delivered-To: mailing list gcc-bugs@gcc.gnu.org
Received: (qmail 17323 invoked by uid 48); 23 Jul 2014 11:57:59 -0000
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/61886] [4.8/4.9/4.10 Regression] LTO breaks fread with _FORTIFY_SOURCE=2
Date: Wed, 23 Jul 2014 11:58:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: lto
X-Bugzilla-Version: 4.9.1
X-Bugzilla-Keywords: diagnostic, lto, wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 4.8.4
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields:
Message-ID: <bug-61886-4-88sByYGCl3@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-61886-4@http.gcc.gnu.org/bugzilla/>
References: <bug-61886-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2014-07/txt/msg01553.txt.bz2
Content-length: 2167

https://gcc.gnu.org/bugzilla/show_bug.cgi?ida886

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fails LTO bootstrap with

/abuild/rguenther/obj/./prev-gcc/xg++ -B/abuild/rguenther/obj/./prev-gcc/
-B/usr/local/x86_64-unknown-linux-gnu/bin/ -nostdinc++
-B/abuild/rguenther/obj/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-B/abuild/rguenther/obj/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs

-I/abuild/rguenther/obj/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include/x86_64-unknown-linux-gnu
 -I/abuild/rguenther/obj/prev-x86_64-unknown-linux-gnu/libstdc++-v3/include
-I/space/rguenther/src/svn/trunk/libstdc++-v3/libsupc++
-L/abuild/rguenther/obj/prev-x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs
-L/abuild/rguenther/obj/prev-x86_64-unknown-linux-gnu/libstdc++-v3/libsupc++/.libs
  -g -O2 -flto=jobserver -frandom-seed=1 -ffat-lto-objects -DIN_GCC
-fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing
-Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual
-pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror
-fno-common  -DHAVE_CONFIG_H -DGENERATOR_FILE -static-libstdc++ -static-libgcc
-o build/genhooks \
            build/genhooks.o build/errors.o .././libiberty/libiberty.a
lto1: internal compiler error: in maybe_add_reference, at symtab.c:613
0x68a129 symtab_node::maybe_add_reference(tree_node*, ipa_ref_use,
gimple_statement_base*)
        /space/rguenther/src/svn/trunk/gcc/symtab.c:613
0x6a16de cgraph_create_virtual_clone(cgraph_node*, vec<cgraph_edge*, va_heap,
vl_ptr>, vec<ipa_replace_map*, va_gc, vl_embed>*, bitmap_head*, char const*)
        /space/rguenther/src/svn/trunk/gcc/cgraphclones.c:582
0x12ca0e5 create_specialized_node
        /space/rguenther/src/svn/trunk/gcc/ipa-cp.c:2802
0x12ce757 decide_whether_version_node
        /space/rguenther/src/svn/trunk/gcc/ipa-cp.c:3556
0x12ce8d3 ipcp_decision_stage
        /space/rguenther/src/svn/trunk/gcc/ipa-cp.c:3668
0x12cef4d ipcp_driver
        /space/rguenther/src/svn/trunk/gcc/ipa-cp.c:3714
0x12cefba execute
        /space/rguenther/src/svn/trunk/gcc/ipa-cp.c:3805