Re: libstdc++/2907: libstdc++ compiled with optimization fails to initialize ios.

Re: libstdc++/2907: libstdc++ compiled with optimization fails to initialize ios.

[Phil Edwards]

The following reply was made to PR libstdc++/2907; it has been noted by GNATS.

From: Phil Edwards <pedwards@disaster.jaj.com>
To: carlo@alinoe.com
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: libstdc++/2907: libstdc++ compiled with optimization fails to initialize ios.
Date: Tue, 22 May 2001 19:58:22 -0400

 On Wed, May 23, 2001 at 12:10:24AM -0000, carlo@alinoe.com wrote:
 > >Description:
 > A simple "hello world" program (anything that includes
 > <iostream>) core dumps when certain configuration flags
 > are used to compile gcc and libstdc++ is compiled with
 > optimization.
 > >How-To-Repeat:
 >         -m "CFLAGS='-O' LIBCFLAGS='-O0 -ggdb3' LIBCXXFLAGS='-O0 -ggdb3 -fno-implicit-templates'" \
 > 	bootstrap
 > 
 > Despite what one expects, this result in libstdc++ to be
 > compiled with "-O9 -march=pentiumpro -fomit-frame-pointer".
 
 What happens when you configure with --enable-debug ?
 
 
 Phil
 
 -- 
 pedwards at disaster dot jaj dot com  |  pme at sources dot redhat dot com
 devphil at several other less interesting addresses in various dot domains
 The gods do not protect fools.  Fools are protected by more capable fools.

Re: libstdc++/2907: libstdc++ compiled with optimization fails to initialize ios.

[Carlo Wood]

The following reply was made to PR libstdc++/2907; it has been noted by GNATS.

From: Carlo Wood <carlo@alinoe.com>
To: gcc-gnats@gcc.gnu.org
Cc: gcc-bugs@gcc.gnu.org
Subject: Re: libstdc++/2907: libstdc++ compiled with optimization fails to initialize ios.
Date: Wed, 23 May 2001 05:11:04 +0200

 I hate it when I make errors :/   (but at least I correct myself within 10 minutes usually ;).
 
 On Wed, May 23, 2001 at 04:58:57AM +0200, Carlo Wood wrote:
 > -fdefer-pop -fomit-frame-pointer 			: core
 > -fthread-jumps -fomit-frame-pointer 			: no core
 > 
 > 
 > Final conclusion: The problem shows itself when compiling locale.cc with
 >  "-fdefer-pop -fomit-frame-pointer", or to be exact:
 > 
 > /usr/src/gcc/gcc-objdir-3.0/i686-pc-linux-gnu/libstdc++-v3/src>make
 > /bin/sh ../libtool --tag CXX --mode=compile /usr/src/gcc/gcc-objdir-3.0/gcc/xgcc \
 > 	 -B/usr/src/gcc/gcc-objdir-3.0/gcc/ -nostdinc++  -L/usr/src/gcc/gcc-objdir-3.0/i686-pc-linux-gnu/libstdc++-v3/src \
 > 	-L/usr/src/gcc/gcc-objdir-3.0/i686-pc-linux-gnu/libstdc++-v3/src/.libs -B/usr/local/gcc-3.0/i686-pc-linux-gnu/bin/ \
 > 	-B/usr/local/gcc-3.0/i686-pc-linux-gnu/lib/ -isystem /usr/local/gcc-3.0/i686-pc-linux-gnu/include -nostdinc++  \
 > 	-I/usr/src/gcc/gcc-cvs-3.0/libstdc++-v3/include -I/usr/src/gcc/gcc-cvs-3.0/libstdc++-v3/include/std \
 > 	-I/usr/src/gcc/gcc-cvs-3.0/libstdc++-v3/include/c_std -I../include \
 > 	-I/usr/src/gcc/gcc-cvs-3.0/libstdc++-v3/libsupc++ -I../libio -I/usr/src/gcc/gcc-cvs-3.0/libstdc++-v3/libio \
 > 	-I/usr/src/gcc/gcc-cvs-3.0/libstdc++-v3/libmath \
 >         -fthread-jumps -fomit-frame-pointer -D_GNU_SOURCE \
           ^^^^^^^^^^^^^^
 >         -fno-implicit-templates           -Wall -Wno-format -W -Wwrite-strings -Winline  -fdiagnostics-show-location=once \
 > 	-ffunction-sections -fdata-sections  -g    -c /usr/src/gcc/gcc-cvs-3.0/libstdc++-v3/src/locale.cc
 
 That "-fthread-jumps" must be "-fdefer-pop" thus.
 Sigh, ... (perhaps it the 5:09 am ... bed time?)
 
 -- 
 Carlo Wood <carlo@alinoe.com>

Re: libstdc++/2907: libstdc++ compiled with optimization fails to initialize ios.

[Carlo Wood]

The following reply was made to PR libstdc++/2907; it has been noted by GNATS.

From: Carlo Wood <carlo@alinoe.com>
To: gcc-gnats@gcc.gnu.org
Cc: gcc-bugs@gcc.gnu.org
Subject: Re: libstdc++/2907: libstdc++ compiled with optimization fails to initialize ios.
Date: Wed, 23 May 2001 04:58:57 +0200

 After compiling as above, and using the given test program that links
 directly with the compiled (not installed) libstdc++:
 
 ~/c++/libcw/src/libcwd/testsuite>ldd a.out
         librmalloc.so.1 => /home/carlo/c++/rmalloc/librmalloc.so.1 (0x40018000)
         libstdc++.so.3 => /usr/src/gcc/gcc-objdir-3.0/i686-pc-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.3 (0x4001d000)
         libm.so.6 => /lib/libm.so.6 (0x4015d000)
         libgcc_s.so.0 => /usr/src/gcc/gcc-objdir-3.0/gcc/libgcc_s.so.0 (0x4017e000)
         libc.so.6 => /lib/libc.so.6 (0x40188000)
         /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
 
 in a different environment (not affecting the environment where I am compiling the
 stdc++ library) (note that rmalloc is used to make sure there is no memory corruption
 involved), I did the following tests:
 
 /usr/src/gcc/gcc-objdir-3.0/i686-pc-linux-gnu/libstdc++-v3/src>grep '^CXXFLAGS =' Makefile
 CXXFLAGS = -O9 -march=pentiumpro -fomit-frame-pointer -D_GNU_SOURCE
 ~/c++/libcw/src/libcwd/testsuite>a.out 2> /dev/null
 Segmentation fault (core dumped)
 
 /usr/src/gcc/gcc-objdir-3.0/i686-pc-linux-gnu/libstdc++-v3/src>vi Makefile
 /usr/src/gcc/gcc-objdir-3.0/i686-pc-linux-gnu/libstdc++-v3/src>grep '^CXXFLAGS =' Makefile
 CXXFLAGS = -O9 -D_GNU_SOURCE
 /usr/src/gcc/gcc-objdir-3.0/i686-pc-linux-gnu/libstdc++-v3/src>rm *.lo *.o
 /usr/src/gcc/gcc-objdir-3.0/i686-pc-linux-gnu/libstdc++-v3/src>make > /dev/null
 ~/c++/libcw/src/libcwd/testsuite>a.out 2> /dev/null
 ~/c++/libcw/src/libcwd/testsuite>
 
 Conclusion: the problem is either -march=pentiumpro or -fomit-frame-pointer
 
 And so on...
 
 CXXFLAGS in src/Makefile	  result
 
 -O9 -march=pentiumpro		: no core
 -fomit-frame-pointer		: no core
 -O9 -fomit-frame-pointer	: core
 -O2 -fomit-frame-pointer	: core
 -O -fomit-frame-pointer		: core
 -fomit-frame-pointer		: no core
 
 Next I started to compile the files one by one with -O -fomit-frame-pointer.
 
 basic_file			: no core
 bitset				: no core
 c++locale			: no core
 codecvt				: no core
 complex_io			: no core
 functexcept			: no core
 globals				: no core
 ios				: no core
 limitsMEMBERS			: no core
 locale-inst			: no core
 locale				: core
 
 Next I compiled all files with -O -fomit-frame-pointer *except* locale.cc, this
 gave no core.  Finally I recompiled all files with -O9 -march=pentiumpro -fomit-frame-pointer
 except locale.cc, which was compiled with nothing.  This still resulted in no core.
 
 Conclusion, the problem is compiling locale.cc with -O -fomit-frame-pointer.
 
 Next I started to use different options instead of -O for locale.lo, the rest still
 compiled with -O9 -march=pentiumpro -fomit-frame-pointer.
 
 CXXFLAGS in src/Makefile				  result
 
 							: no core
 -O -fomit-frame-pointer					: core
 -fthread-jumps -fdefer-pop -fomit-frame-pointer 	: core
 -fomit-frame-pointer 					: no core
 -fdefer-pop -fomit-frame-pointer 			: core
 -fthread-jumps -fomit-frame-pointer 			: no core
 
 
 Final conclusion: The problem shows itself when compiling locale.cc with
  "-fdefer-pop -fomit-frame-pointer", or to be exact:
 
 /usr/src/gcc/gcc-objdir-3.0/i686-pc-linux-gnu/libstdc++-v3/src>make
 /bin/sh ../libtool --tag CXX --mode=compile /usr/src/gcc/gcc-objdir-3.0/gcc/xgcc \
 	 -B/usr/src/gcc/gcc-objdir-3.0/gcc/ -nostdinc++  -L/usr/src/gcc/gcc-objdir-3.0/i686-pc-linux-gnu/libstdc++-v3/src \
 	-L/usr/src/gcc/gcc-objdir-3.0/i686-pc-linux-gnu/libstdc++-v3/src/.libs -B/usr/local/gcc-3.0/i686-pc-linux-gnu/bin/ \
 	-B/usr/local/gcc-3.0/i686-pc-linux-gnu/lib/ -isystem /usr/local/gcc-3.0/i686-pc-linux-gnu/include -nostdinc++  \
 	-I/usr/src/gcc/gcc-cvs-3.0/libstdc++-v3/include -I/usr/src/gcc/gcc-cvs-3.0/libstdc++-v3/include/std \
 	-I/usr/src/gcc/gcc-cvs-3.0/libstdc++-v3/include/c_std -I../include \
 	-I/usr/src/gcc/gcc-cvs-3.0/libstdc++-v3/libsupc++ -I../libio -I/usr/src/gcc/gcc-cvs-3.0/libstdc++-v3/libio \
 	-I/usr/src/gcc/gcc-cvs-3.0/libstdc++-v3/libmath \
         -fthread-jumps -fomit-frame-pointer -D_GNU_SOURCE \
         -fno-implicit-templates           -Wall -Wno-format -W -Wwrite-strings -Winline  -fdiagnostics-show-location=once \
 	-ffunction-sections -fdata-sections  -g    -c /usr/src/gcc/gcc-cvs-3.0/libstdc++-v3/src/locale.cc
 
 --
 Carlo Wood <carlo@alinoe.com>
 

libstdc++/2907: libstdc++ compiled with optimization fails to initialize ios.

[carlo]

>Number:         2907
>Category:       libstdc++
>Synopsis:       libstdc++ compiled with optimization fails to initialize ios.
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 22 17:15:59 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Carlo Wood
>Release:        gcc-ss-20010521
>Organization:
>Environment:
i686-pc-linux-gnu
>Description:
A simple "hello world" program (anything that includes
<iostream>) core dumps when certain configuration flags
are used to compile gcc and libstdc++ is compiled with
optimization.
>How-To-Repeat:
None or all of the following might be needed to reproduce
the bug:
machine: athlon/K7 with linux kernel 2.4.4
distribution: mainly Redhat 7.0 but with a lot rawhide rpms
among which:
glibc-2.2-12
binutils-2.10.91.0.2-3

Snap shot 20010521 checked out using -r gcc_latest_snapshot
Configuration was done by running:

env CC=gcc CFLAGS="-O9 -march=pentiumpro -fomit-frame-pointer" \
    CXXFLAGS="-O9 -march=pentiumpro -fomit-frame-pointer" \
    ./gcc-cvs-3.0/contrib/gcc_build \
        -d /usr/src/gcc/gcc-cvs-3.0 \
        -o ../gcc-objdir-3.0 \
        -c "--prefix=/usr/local/gcc-3.0 --enable-shared --with-gnu-as --with-gnu-ld --enable-languages=c++" \
        -m "CFLAGS='-O' LIBCFLAGS='-O0 -ggdb3' LIBCXXFLAGS='-O0 -ggdb3 -fno-implicit-templates'" \
        configure

where /usr/src/gcc/gcc-cvs-3.0 is my source directory
and /usr/src/gcc/gcc-objdir-3.0 is my object directory.

Compilation was done by running:

env CC=gcc CFLAGS="-O9 -march=pentiumpro -fomit-frame-pointer" \
    CXXFLAGS="-O9 -march=pentiumpro -fomit-frame-pointer" \
    ./gcc-cvs-3.0/contrib/gcc_build \
        -d /usr/src/gcc/gcc-cvs-3.0 \
        -o ../gcc-objdir-3.0 \
        -c "--prefix=/usr/local/gcc-3.0 --enable-shared --with-gnu-as --with-gnu-ld --enable-languages=c++" \
        -m "CFLAGS='-O' LIBCFLAGS='-O0 -ggdb3' LIBCXXFLAGS='-O0 -ggdb3 -fno-implicit-templates'" \
	bootstrap

Despite what one expects, this result in libstdc++ to be
compiled with "-O9 -march=pentiumpro -fomit-frame-pointer".

After installation, a simple program like

#include <iostream>
int main(void) { return 0; }

core dumps when run.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: