Re: experimental gcc-3.2 packages
On Thu, Aug 08, 2002 at 09:58:57PM +0200, Martin v. Loewis wrote: > Chris Halls <[EMAIL PROTECTED]> writes: > > > I have posted the test script and preprocessed source here: > > http://apt-proxy.sourceforge.net/ooo/g++test > > http://apt-proxy.sourceforge.net/ooo/test.cxx.bz2 > > Maybe I'm missing something, but... Is it the case that > ucb::ContentProviderImplHelper::~ContentProviderImplHelper is not > implemented in this file? Is it further the case that this is the > first virtual function of ContentProviderImplHelper? Hmm, yes it looks like that is the case. > If so, the virtual table for that class should not be emitted in > test.o, and it appears that g++ 3.1 behaves correctly in this respect. I take it that the 'typeinfo' should also not be emitted, as well as the virtual table? g++ 3.1 is actually emitting this typeinfo, along with 3.0 and 2.95 - it is the preliminary g++ 3.2 that is no longer emitting this information. This is going to break OpenOffice and any other programs that rely on this behaviour. So, should this change be considered to be a bug fix in g++ 3.2, and anything which breaks because of it should be fixed, or is it a problem with g++ 3.2? I'm pretty agnostic either way - I'm just trying to determine which program gets the blame and which needs fixing :) Thanks, Chris pgpwWv1JBzRZQ.pgp Description: PGP signature
[no subject]
>Submitter-Id: net
>Originator:Johannes Stezenbach
>Organization:
>Confidential: no
>Synopsis: gcc-3.1.1 (debian/i386): wrong code with -O2 / bitfields /
>pointer aliasing
>Severity: serious
>Priority: medium
>Category: optimization
>Class: wrong-code
>Release: 3.1.1 (Debian testing/unstable)
>Environment:
System: Linux hell 2.4.19pre1 #3 Sun May 12 19:15:17 CEST 2002 i686 unknown
unknown GNU/Linux
Architecture: i686
host: i386-pc-linux-gnu
build: i386-pc-linux-gnu
target: i386-pc-linux-gnu
configured with: /mnt/data/gcc-3.1/gcc-3.1-3.1.1ds3/src/configure -v
--enable-languages=c,c++,java,f77,proto,objc,ada --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info
--with-gxx-include-dir=/usr/include/c++/3.1 --enable-shared --with-system-zlib
--enable-long-long --enable-nls --without-included-gettext --enable-clocale=gnu
--enable-__cxa_atexit --enable-threads=posix --enable-java-gc=boehm
--enable-objc-gc i386-linux
>Description:
The attached sample program produces wrong output when
compiled with -O2. Output produced when compiled with-O is
correct.
I'm attaching the C source as well as compressed preprcessor output.
$ gcc-3.1 -Wall -O2 bug.c -o bug
$ ./bug
8 8
0xbeaddeef 0x34127856
0xa307401c 0x12345678
$ gcc-3.1 -Wall -O bug.c -o bug
$ ./bug
8 8
0xbeaddeef 0x34127856
0xdeadbeef 0x12345678
$ gcc-3.1 -v -Wall -O2 bug.c -o bug
Reading specs from /usr/lib/gcc-lib/i386-linux/3.1.1/specs
Configured with: /mnt/data/gcc-3.1/gcc-3.1-3.1.1ds3/src/configure -v
--enable-languages=c,c++,java,f77,proto,objc,ada --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info
--with-gxx-include-dir=/usr/include/c++/3.1 --enable-shared --with-system-zlib
--enable-long-long --enable-nls --without-included-gettext --enable-clocale=gnu
--enable-__cxa_atexit --enable-threads=posix --enable-java-gc=boehm
--enable-objc-gc i386-linux
Thread model: posix
gcc version 3.1.1
/usr/lib/gcc-lib/i386-linux/3.1.1/cc1 -lang-c -v -D__GNUC__=3
-D__GNUC_MINOR__=1 -D__GNUC_PATCHLEVEL__=1 -D__ELF__ -Dunix -D__gnu_linux__
-Dlinux -D__ELF__ -D__unix__ -D__gnu_linux__ -D__linux__ -D__unix -D__linux
-Asystem=posix -D__OPTIMIZE__ -D__STDC_HOSTED__=1 -Acpu=i386 -Amachine=i386
-Di386 -D__i386 -D__i386__ -D__tune_i386__ bug.c -quiet -dumpbase bug.c -O2
-Wall -version -o /home/js/tmp/ccA9puym.s
GNU CPP version 3.1.1 (cpplib) (i386 Linux/ELF)
GNU C version 3.1.1 (i386-linux)
compiled by GNU C version 3.1.1.
ignoring nonexistent directory "/usr/i386-linux/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/lib/gcc-lib/i386-linux/3.1.1/include
/usr/include
End of search list.
as -V -Qy -o /home/js/tmp/ccA3HBCF.o /home/js/tmp/ccA9puym.s
GNU assembler version 2.12.90.0.15 (i386-linux) using BFD version 2.12.90.0.15
20020717 Debian GNU/Linux
/usr/lib/gcc-lib/i386-linux/3.1.1/collect2 --eh-frame-hdr -m elf_i386
-dynamic-linker /lib/ld-linux.so.2 -o bug
/usr/lib/gcc-lib/i386-linux/3.1.1/../../../crt1.o
/usr/lib/gcc-lib/i386-linux/3.1.1/../../../crti.o
/usr/lib/gcc-lib/i386-linux/3.1.1/crtbegin.o
-L/usr/lib/gcc-lib/i386-linux/3.1.1
-L/usr/lib/gcc-lib/i386-linux/3.1.1/../../.. /home/js/tmp/ccA3HBCF.o -lgcc
-lgcc_eh -lc -lgcc -lgcc_eh /usr/lib/gcc-lib/i386-linux/3.1.1/crtend.o
/usr/lib/gcc-lib/i386-linux/3.1.1/../../../crtn.o
>How-To-Repeat:
/* gcc-3.1.1 bug: wrong results with -O2 */
#include
#include
struct foo {
unsigned int a: 8,
b:24;
unsigned int c:16,
d:16;
};
struct foo_swabbed {
unsigned int b:24,
a: 8;
unsigned int d:16,
c:16;
};
static void swab_foo(struct foo *f)
{
struct foo_swabbed fs = *(struct foo_swabbed *) f;
unsigned int *p = (unsigned int *)&fs;
p[0] = __swab32(p[0]);
p[1] = __swab32(p[1]);
f->a = fs.a;
f->b = fs.b;
f->c = fs.c;
f->d = fs.d;
}
int main(void)
{
struct foo f = { 0xef, 0xbeadde, 0x7856, 0x3412 };
unsigned int *p = (unsigned int *)&f;
printf("%u %u\n", sizeof(struct foo), sizeof(struct foo_swabbed));
printf("%#010x %#010x\n", p[0], p[1]);
swab_foo(&f);
printf("%#010x %#010x\n", p[0], p[1]);
return 0;
}
>Fix:
preprocessor option -MM has change semantic
>Submitter-Id: net
>Originator:
>Organization:
>Confidential: no
>Synopsis: preprocessor option -MM has change semantic
>Severity: serious
>Priority: medium
>Category: preprocessor
>Class: change-request
>Release: 3.1.1 (Debian testing/unstable)
>Environment:
System: Linux kosh 2.4.18-k7 #1 Sun Apr 14 13:19:11 EST 2002 i686 unknown
unknown GNU/Linux
Architecture: i686
host: i386-pc-linux-gnu
build: i386-pc-linux-gnu
target: i386-pc-linux-gnu
configured with: /mnt/data/gcc-3.1/gcc-3.1-3.1.1ds3/src/configure -v
--enable-languages=c,c++,java,f77,proto,objc,ada --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info
--with-gxx-include-dir=/usr/include/c++/-3.1 --enable-shared --with-system-zlib
--enable-long-long --enable-nls --without-included-gettext --enable-clocale=gnu
--enable-__cxa_atexit --enable-threads=posix --enable-java-gc=boehm
--enable-objc-gc i386-linux
>Description:
In gcc 3.1, -MM prints dependencies even to files included with
angle brackets (), if those are found through -I options.
This behaviour is unintuitive and a change from earlier versions.
It appears that the only way to suppress these files is to use the
-isystem directive, which is quite gcc specific and hard to use
in a makefile that needs to work across different compilers, or
that is generated by autoconf.
>How-To-Repeat:
Compile the file
#include
int
main()
{
}
with gcc -I. -MM; this gives
a.o: a.c a.h
even though a.h should not have been mentioned.
>Fix:
No real work-around is known.
Re: experimental gcc-3.2 packages
Chris Halls <[EMAIL PROTECTED]> writes: > > If so, the virtual table for that class should not be emitted in > > test.o, and it appears that g++ 3.1 behaves correctly in this respect. > > I take it that the 'typeinfo' should also not be emitted, as well as the > virtual table? Correct. > g++ 3.1 is actually emitting this typeinfo, along with 3.0 and 2.95 - it is > the preliminary g++ 3.2 that is no longer emitting this information. This > is going to break OpenOffice and any other programs that rely on this > behaviour. Those programs are broken already. In C++, you must implement all virtual functions. > So, should this change be considered to be a bug fix in g++ 3.2, and > anything which breaks because of it should be fixed, or is it a > problem with g++ 3.2? It's clearly a bug fix. Regards, Martin
gcc-3.2_3.2ds0-0pre3_i386.changes is NEW
(new) cpp-3.2-doc_3.2-0pre3_all.deb optional doc Documentation for the GNU C preprocessor (cpp). Documentation for the GNU C preprocessor in info format. (new) cpp-3.2_3.2-0pre3_i386.deb standard interpreters The GNU C preprocessor. The GNU C preprocessor is a macro processor that is used automatically by the GNU C compiler to transform programs before actual compilation. . This package has been separated from gcc for the benefit of those who require the preprocessor but not the compiler. fastjar_3.2-0pre3_i386.deb to pool/main/g/gcc-3.2/fastjar_3.2-0pre3_i386.deb fixincludes_3.2-0pre3_i386.deb to pool/main/g/gcc-3.2/fixincludes_3.2-0pre3_i386.deb (new) g++-3.2_3.2-0pre3_i386.deb optional devel The GNU C++ compiler. This is the GNU C++ compiler, a fairly portable optimizing compiler for C++. (new) g77-3.2-doc_3.2-0pre3_all.deb optional doc Documentation for the GNU Fortran compiler (g77). Documentation for the GNU Fortran 77 compiler in info format. (new) g77-3.2_3.2-0pre3_i386.deb optional devel The GNU Fortran 77 compiler. This is the GNU g77 Fortran compiler, which compiles Fortran 77 on platforms supported by the gcc compiler. It uses the gcc backend to generate optimized code. (new) gcc-3.2-base_3.2-0pre3_i386.deb standard devel The GNU Compiler Collection (base package). This package contains files common to all languages and libraries contained in the GNU Compiler Collection (GCC). (new) gcc-3.2-doc_3.2-0pre3_all.deb optional doc Documentation for the GNU compilers (gcc, gobjc, g++). Documentation for the GNU compilers in info format. (new) gcc-3.2_3.2-0pre3_i386.deb standard devel The GNU C compiler. This is the GNU C compiler, a fairly portable optimizing compiler for C. (new) gcc-3.2_3.2ds0-0pre3.diff.gz standard devel (new) gcc-3.2_3.2ds0-0pre3.dsc standard devel (new) gcc-3.2_3.2ds0.orig.tar.gz standard devel (new) gcj-3.2_3.2-0pre3_i386.deb optional devel The GNU compiler for Java(TM). GCJ is a front end to the GCC compiler which can natively compile both Java(tm) source and bytecode files. The compiler can also generate class files. (new) gij-3.2_3.2-0pre3_i386.deb optional devel The GNU Java bytecode interpreter. GIJ is not limited to interpreting bytecode. It includes a class loader which can dynamically load shared objects, so it is possible to give it the name of a class which has been compiled and put into a shared library on the class path. (new) gnat-3.2-doc_3.2-0pre3_all.deb optional doc Documentation for the GNU Ada compiler (gnat). Documentation for the GNU Ada compiler in info format. (new) gnat-3.2_3.2-0pre3_i386.deb optional devel The GNU Ada compiler. This is the GNU Ada compiler, which compiles Ada on platforms supported by the gcc compiler. It uses the gcc backend to generate optimized code. (new) gobjc-3.2_3.2-0pre3_i386.deb optional devel The GNU Objective-C compiler. This is the GNU Objective-C compiler, which compiles Objective-C on platforms supported by the gcc compiler. It uses the gcc backend to generate optimized code. libffi2-dev_3.2-0pre3_i386.deb to pool/main/g/gcc-3.2/libffi2-dev_3.2-0pre3_i386.deb libffi2_3.2-0pre3_i386.deb to pool/main/g/gcc-3.2/libffi2_3.2-0pre3_i386.deb libg2c0_3.2-0pre3_i386.deb to pool/main/g/gcc-3.2/libg2c0_3.2-0pre3_i386.deb libgcc1_3.2-0pre3_i386.deb to pool/main/g/gcc-3.2/libgcc1_3.2-0pre3_i386.deb (new) libgcj-common_3.2-0pre3_i386.deb optional libs Java runtime library (common files) This package contains files shared by classpath and libgcj libraries. libgcj3-dev_3.2-0pre3_i386.deb to pool/main/g/gcc-3.2/libgcj3-dev_3.2-0pre3_i386.deb libgcj3_3.2-0pre3_i386.deb to pool/main/g/gcc-3.2/libgcj3_3.2-0pre3_i386.deb libgnat3.15a_3.2-0pre3_i386.deb to pool/main/g/gcc-3.2/libgnat3.15a_3.2-0pre3_i386.deb libobjc1_3.2-0pre3_i386.deb to pool/main/g/gcc-3.2/libobjc1_3.2-0pre3_i386.deb (new) libstdc++5-dbg_3.2-0pre3_i386.deb extra devel The GNU stdc++ library version 3 (debugging files) This package contains the shared library of libstdc++ compiled with debugging symbols. (new) libstdc++5-dev_3.2-0pre3_i386.deb optional devel The GNU stdc++ library version 3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. Be advised that this only works with the GNU C++ compiler (version 3.0), and no earlier library will work it. (new) libstdc++5-doc_3.2-0pre3_all.deb optional doc The GNU stdc++ library version 3 (documentation files) This package contains documentation files for the GNU stdc++ library. . One set is the distribution documentation, the other set is the source documentation including a namespace list, class hierarchy, alphabetical list, compound list, file list, namespace members, compound members and file members. (new) libstdc++5-pic_3.2-0pre3_i386.deb extra devel The GNU stdc++ library version 3 (shared library subset kit) This is used to develop subsets of the libstdc++ shared libraries for use on
