[Bug middle-end/52306] ICE in cselib_record_set, at cselib.c:2158

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52306

--- Comment #19 from Thorsten Glaser <tg at mirbsd dot org> ---
Created attachment 30668
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30668&action=edit
Testcase from qtbase-opensource-src_5.1.0+dfsg-4 and g++ 4.8.1

This issue still appears with GCC 4.8

In GCC 4.6 in Debian/m68k I eventually applied a patch that simply retries the
build with -O1 then -O0 to mask this issue, but the underlying issue is still
unfixed. This occurs in 4.8 now too, so I guess (from a distro PoV) I need to
port said patch, until someone finds out what precisely is going on here.

g++ -c x.cc -std=c++0x -fno-exceptions ⇒ compiles fine
g++ -c x.cc -std=c++0x -fno-exceptions -O2 ⇒ ICEs:
In file included from ../../../include/QtCore/qlist.h:1:0,
                 from
../../../include/QtCore/../../src/corelib/tools/qhash.h:47,
                 from ../../../include/QtCore/qhash.h:1,
                 from ../../../include/QtCore/../../src/corelib/io/qdebug.h:46,
                 from ../../../include/QtCore/qdebug.h:1,
                 from ditaxmlgenerator.cpp:46:
../../../include/QtCore/../../src/corelib/tools/qlist.h: In member function
‘void QList<T>::append(const T&) [with T = Section]’:
../../../include/QtCore/../../src/corelib/tools/qlist.h:521:1: internal
compiler error: in cselib_record_set, at cselib.c:2373
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.8/README.Bugs> for instructions.
Preprocessed source stored into /tmp/ccUYfyzd.out file, please attach this to
your bugreport.
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From: "mikpe at it dot uu.se" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/52306] ICE in cselib_record_set, at cselib.c:2158
Date: Sat, 17 Aug 2013 18:31:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idR306

--- Comment #20 from Mikael Pettersson <mikpe at it dot uu.se> ---
(In reply to Thorsten Glaser from comment #19)
> Created attachment 30668 [details]
> Testcase from qtbase-opensource-src_5.1.0+dfsg-4 and g++ 4.8.1
>
> This issue still appears with GCC 4.8
>
> In GCC 4.6 in Debian/m68k I eventually applied a patch that simply retries
> the build with -O1 then -O0 to mask this issue, but the underlying issue is
> still unfixed. This occurs in 4.8 now too, so I guess (from a distro PoV) I
> need to port said patch, until someone finds out what precisely is going on
> here.

Please try compiling with -O2 -fno-auto-inc-dec before dropping to -O1 or -O0.