Your message dated Sat, 07 Aug 2010 19:32:29 +0000
with message-id <[email protected]>
and subject line Bug#591405: fixed in binutils 2.20.1-13
has caused the Debian Bug report #591405,
regarding ld: -no-add-needed breaks linking with weak symbols
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
591405: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=591405
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: g++-4.4
Version: 4.4.4-7
Severity: normal
[ First of all, this bug seems to be the same as bugs #577961 and
#578831, only they cover gcc-4.5, where afaik -Wl,-no-add-needed
is default ]
I'm trying to build my libraries with -Wl,-no-add-needed and got an
issue wrt weak symbols handling. Here is the testcase (based on
#577961):
---- 8< Makefile ----
CXXLD=$(CXX) -Wl,-no-add-needed
CXXFLAGS=-Wall -fPIC -std=gnu++0x
CPPFLAGS=-I.
all: mymain2 mymain libkapi.so.0
mymain: mymain.o libkapi.so
$(CXXLD) -o $@ $(CXXFLAGS) mymain.o -L. -lkapi
mymain2: mymain.o
$(CXXLD) -o $@ $(CXXFLAGS) mymain.o
libkapi.so: libkapi.so.0
ln -fs [email protected] $@
kapi.cc:
touch $@
kapi.o: kapi.cc
libkapi.so.0: kapi.o
$(CXXLD) $(CXXFLAGS) -shared -Wl,-soname -Wl,$@ -o $@ $^ -pthread
clean:
$(RM) *.o libkapi.so.0 mymain kapi.cc libkapi.so mymain2
---- 8< mymain.cc ----
#include <iostream>
#include <memory>
#include <string>
using namespace std;
int main () {
string numbers[] ={"one","two","three"};
// get block of uninitialized memory:
pair <string*,ptrdiff_t> result = get_temporary_buffer<string>(3);
if (result.second>0) {
uninitialized_copy ( numbers, numbers+result.second, result.first );
for (int i=0; i<result.second; i++)
cout << result.first[i] << " ";
cout << endl;
return_temporary_buffer(result.first);
}
return 0;
}
$ make
g++ -Wall -fPIC -std=gnu++0x -I. -c -o mymain.o mymain.cc
g++ -Wl,-no-add-needed -o mymain2 -Wall -fPIC -std=gnu++0x mymain.o
touch kapi.cc
g++ -Wall -fPIC -std=gnu++0x -I. -c -o kapi.o kapi.cc
g++ -Wl,-no-add-needed -Wall -fPIC -std=gnu++0x -shared -Wl,-soname
-Wl,libkapi.so.0 -o libkapi.so.0 kapi.o -pthread
ln -fs libkapi.so.0 libkapi.so
g++ -Wl,-no-add-needed -o mymain -Wall -fPIC -std=gnu++0x mymain.o -L. -lkapi
/usr/bin/ld: :: invalid DSO for symbol `pthread_cancel@@GLIBC_2.0' definition
/lib/libpthread.so.0: could not read symbols: Bad value
collect2: ld returned 1 exit status
If CXXLD is changed back to just $(CXX) it builds ok.
As I can tell this is related to libstdc++ weakly pulling in libpthread.so, but
if then another library (libkapi.so) links explicitely to libpthread, when
linking mymain, linker wrongly decides we need pthread_cancel non-weakly.
See e.g. this thread:
http://www.mail-archive.com/[email protected]/msg00042.html
Probably a linker issue too, so
$ ld -v
GNU ld (GNU Binutils for Debian) 2.20.1-system.20100303
Thanks,
Kirill
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.33.6-roro-00002-gf825b2a-dirty (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages g++-4.4 depends on:
ii gcc-4.4 4.4.4-7 The GNU C compiler
ii gcc-4.4-base 4.4.4-7 The GNU Compiler Collection (base
ii libc6 2.11.2-2 Embedded GNU C Library: Shared lib
ii libgmp3c2 2:4.3.2+dfsg-1 Multiprecision arithmetic library
ii libmpfr1ldbl 2.4.2-3 multiple precision floating-point
ii libstdc++6-4.4-dev 4.4.4-7 The GNU Standard C++ Library v3 (d
g++-4.4 recommends no packages.
Versions of packages g++-4.4 suggests:
pn g++-4.4-multilib <none> (no description available)
ii gcc-4.4-doc 4.4.4.nf1-1 documentation for the GNU compiler
ii libstdc++6-4.4-dbg 4.4.4-7 The GNU Standard C++ Library v3 (d
-- no debconf information
--- End Message ---
--- Begin Message ---
Source: binutils
Source-Version: 2.20.1-13
We believe that the bug you reported is fixed in the latest version of
binutils, which is due to be installed in the Debian FTP archive:
binutils-dev_2.20.1-13_amd64.deb
to main/b/binutils/binutils-dev_2.20.1-13_amd64.deb
binutils-doc_2.20.1-13_all.deb
to main/b/binutils/binutils-doc_2.20.1-13_all.deb
binutils-gold_2.20.1-13_amd64.deb
to main/b/binutils/binutils-gold_2.20.1-13_amd64.deb
binutils-multiarch_2.20.1-13_amd64.deb
to main/b/binutils/binutils-multiarch_2.20.1-13_amd64.deb
binutils-source_2.20.1-13_all.deb
to main/b/binutils/binutils-source_2.20.1-13_all.deb
binutils_2.20.1-13.diff.gz
to main/b/binutils/binutils_2.20.1-13.diff.gz
binutils_2.20.1-13.dsc
to main/b/binutils/binutils_2.20.1-13.dsc
binutils_2.20.1-13_amd64.deb
to main/b/binutils/binutils_2.20.1-13_amd64.deb
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Matthias Klose <[email protected]> (supplier of updated binutils package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Format: 1.8
Date: Sat, 07 Aug 2010 21:01:40 +0200
Source: binutils
Binary: binutils binutils-dev binutils-multiarch binutils-gold binutils-hppa64
binutils-spu binutils-doc binutils-source
Architecture: source all amd64
Version: 2.20.1-13
Distribution: unstable
Urgency: low
Maintainer: Matthias Klose <[email protected]>
Changed-By: Matthias Klose <[email protected]>
Description:
binutils - The GNU assembler, linker and binary utilities
binutils-dev - The GNU binary utilities (BFD development files)
binutils-doc - Documentation for the GNU assembler, linker and binary utilities
binutils-gold - The (experimental) GNU gold linker utility
binutils-hppa64 - The GNU assembler, linker and binary utilities targeted for
hppa6
binutils-multiarch - Binary utilities that support multi-arch targets
binutils-source - The GNU assembler, linker and binary utilities (source)
binutils-spu - The GNU assembler, linker and binary utilities targeted for
spu-e
Closes: 591405
Changes:
binutils (2.20.1-13) unstable; urgency=low
.
* Fix --no-add-needed with weak symbols (Kirill Smelkov). Closes: #591405.
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