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From: "S dot Diederich at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/27795] New: optimizer produces faulty code
Date: Mon, 29 May 2006 16:52:00 -0000 [thread overview]
Message-ID: <bug-27795-12751@http.gcc.gnu.org/bugzilla/> (raw)
The attached (simple) piece of code segfaults if compiled with (>=)-O2.
There are several possibilities to trigger the error.
1. Using the attached cpp, compile with -O2 ends in segfault when running the
app (-O{0,1} is fine)
2. If the cout in the last line is removed, everything seems to be fine
3. If line 16 is exchanged with line 15, everything is fine, too.
(tested on gentoo and SuSE)
Output of "g++ -v -save-temps -O2 compilerbugCPP.cpp -o compilerbug":
Using built-in specs.
Target: i586-suse-linux
Configured with: ../configure --enable-threads=posix --prefix=/usr
--with-local-prefix=/usr/local --infodir=/usr/share/info
--mandir=/usr/share/man --libdir=/usr/lib --libexecdir=/usr/lib
--enable-languages=c,c++,objc,fortran,java,ada --enable-checking=release
--with-gxx-include-dir=/usr/include/c++/4.1.0 --enable-ssp --disable-libssp
--enable-java-awt=gtk --enable-gtk-cairo --disable-libjava-multilib
--with-slibdir=/lib --with-system-zlib --enable-shared --enable-__cxa_atexit
--enable-libstdcxx-allocator=new --without-system-libunwind --with-cpu=generic
--host=i586-suse-linux
Thread model: posix
gcc version 4.1.0 (SUSE Linux)
/usr/lib/gcc/i586-suse-linux/4.1.0/cc1plus -E -quiet -v -D_GNU_SOURCE
compilerbugCPP.cpp -mtune=generic -O2 -fpch-preprocess -o compilerbugCPP.ii
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/4.1.0
/usr/include/c++/4.1.0/i586-suse-linux
/usr/include/c++/4.1.0/backward
/usr/local/include
/usr/lib/gcc/i586-suse-linux/4.1.0/include
/usr/lib/gcc/i586-suse-linux/4.1.0/../../../../i586-suse-linux/include
/usr/include
End of search list.
/usr/lib/gcc/i586-suse-linux/4.1.0/cc1plus -fpreprocessed compilerbugCPP.ii
-quiet -dumpbase compilerbugCPP.cpp -mtune=generic -auxbase compilerbugCPP -O2
-version -o compilerbugCPP.s
GNU C++ version 4.1.0 (SUSE Linux) (i586-suse-linux)
compiled by GNU C version 4.1.0 (SUSE Linux).
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=129317
Compiler executable checksum: c877835e2478fb620b785c23d7318e1f
/usr/lib/gcc/i586-suse-linux/4.1.0/../../../../i586-suse-linux/bin/as -V -Qy
-o compilerbugCPP.o compilerbugCPP.s
GNU assembler version 2.16.91.0.5 (i586-suse-linux) using BFD version
2.16.91.0.5 20051219 (SUSE Linux)
/usr/lib/gcc/i586-suse-linux/4.1.0/collect2 --eh-frame-hdr -m elf_i386
-dynamic-linker /lib/ld-linux.so.2 -o compilerbug
/usr/lib/gcc/i586-suse-linux/4.1.0/../../../crt1.o
/usr/lib/gcc/i586-suse-linux/4.1.0/../../../crti.o
/usr/lib/gcc/i586-suse-linux/4.1.0/crtbegin.o
-L/usr/lib/gcc/i586-suse-linux/4.1.0 -L/usr/lib/gcc/i586-suse-linux/4.1.0
-L/usr/lib/gcc/i586-suse-linux/4.1.0/../../../../i586-suse-linux/lib
-L/usr/lib/gcc/i586-suse-linux/4.1.0/../../.. compilerbugCPP.o -lstdc++ -lm
-lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/i586-suse-linux/4.1.0/crtend.o
/usr/lib/gcc/i586-suse-linux/4.1.0/../../../crtn.o
--
Summary: optimizer produces faulty code
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: S dot Diederich at gmx dot de
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27795
next reply other threads:[~2006-05-29 16:52 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-29 16:52 S dot Diederich at gmx dot de [this message]
2006-05-29 16:53 ` [Bug c++/27795] " S dot Diederich at gmx dot de
2006-05-29 16:54 ` S dot Diederich at gmx dot de
2006-05-29 16:58 ` [Bug tree-optimization/27795] [4.1/4.2 Regression] optimizer produces faulty code [tree-vrp] pinskia at gcc dot gnu dot org
2006-05-29 17:05 ` [Bug tree-optimization/27795] [4.1 " pinskia at gcc dot gnu dot org
2006-05-29 18:03 ` pinskia at gcc dot gnu dot org
2006-05-30 13:46 ` rguenth at gcc dot gnu dot org
2006-07-21 12:27 ` rguenth at gcc dot gnu dot org
2006-07-24 8:26 ` rguenth at gcc dot gnu dot org
2006-07-24 8:29 ` rguenth at gcc dot gnu dot org
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