Hi all,
[ sorry for crossposting ]
I have investigated a little bit GNU ld problems on Solaris related to
filter symbols and I seem to have identified one test case which fails
under all circumstances. I'd like to get some advices on how to best
proceed next.
The nice background info to the problem is at
http://www.opensolaris.org/jive/thread.jspa?threadID=18778&tstart=45.
There seems to be a bug in GNU ld that does not link filter symbols
properly. The expected behavior is to link in filter symbols as
`undefined' thus leaving them for resolution at runtime. In certain
cases, ld does not recognize filter symbols and links them into the
resulting binary as absolute symbols at address 0x0.
This happens as I could observe when:
1. library that contains filtered symbols is mentioned at the ld
commandline, i.e. -lpthread, -ldl, -lc
2. -Wl,-shared option is specified
I also know that the problem does not occur when -Wl,-shared is removed
entirely, or replaced with -Wl,-E or -Wl,-Bdynamic, although I don't
know how these differ.
There might be other circumstances where this bug exhibits itself, but
this one is 100% reproducible, I have attached the simple test case +
its output + version of the software used. The problematic system in
question is Nexenta GNU Solaris alpha 6.
let me know what other information I can provide,
thanx,
Martin
--
http://martinman.net
binutils-bug.tar.gz
Description: GNU Zip compressed data
echo "Rebuilding bggy1..."
Rebuilding bggy1...
gcc -o bggy1 -shared -lpthread -ldl buggy.c
ldd bggy1
libpthread.so.1 => /lib/libpthread.so.1
libdl.so.1 =>/lib/libdl.so.1
libgcc_s.so.1 => /lib/libgcc_s.so.1
libc.so.1 => /lib/libc.so.1
libm.so.2 => /lib/libm.so.2
echo "The nm output of bggy1 should ideally not contain any Absolute symbols at
address 0x"
The nm output of bggy1 should ideally not contain any Absolute symbols at
address 0x
nm -D bggy1 | grep '\(pthr\|dlop\)'
A dlopen
A pthread_mutex_destroy
A pthread_mutex_init
echo ""
echo "Rebuilding bggy2..."
Rebuilding bggy2...
gcc -o bggy2 -Wl,-shared -lpthread -ldl buggy.c
ldd bggy2
libpthread.so.1 => /lib/libpthread.so.1
libdl.so.1 =>/lib/libdl.so.1
libc.so.1 => /lib/libc.so.1
libm.so.2 => /lib/libm.so.2
echo "The nm output of bggy2 should ideally not contain any Absolute symbols at
address 0x"
The nm output of bggy2 should ideally not contain any Absolute symbols at
address 0x
nm -D bggy2 | grep '\(pthr\|dlop\)'
A dlopen
A pthread_mutex_destroy
A pthread_mutex_init
echo ""
echo "Rebuilding bggy3..."
Rebuilding bggy3...
gcc -o bggy3 -Wl,-E -lpthread -ldl buggy.c
ldd bggy3
libpthread.so.1 => /lib/libpthread.so.1
libdl.so.1 =>/lib/libdl.so.1
libc.so.1 => /lib/libc.so.1
libm.so.2 => /lib/libm.so.2
echo "The nm output of bggy3 should ideally not contain any Absolute symbols at
address 0x"
The nm output of bggy3 should ideally not contain any Absolute symbols at
address 0x
nm -D bggy3 | grep '\(pthr\|dlop\)'
U dlopen
U pthread_mutex_destroy
U pthread_mutex_init
echo ""
echo "Rebuilding bggy4..."
Rebuilding bggy4...
gcc -o bggy4 -lpthread -ldl buggy.c
ldd bggy4
libpthread.so.1 => /lib/libpthread.so.1
libdl.so.1 =>/lib/libdl.so.1
libc.so.1 => /lib/libc.so.1
libm.so.2 => /lib/libm.so.2
echo "The nm output of bggy4 should ideally not contain any Absolute symbols at
address 0x"
The nm output of bggy4 should ideally not contain any Absolute symbols at
address 0x
nm -D bggy4 | grep '\(pthr\|dlop\)'
U dlopen
U pthread_mutex_destroy
U pthread_mutex_init
echo ""
echo "Rebuilding bggy5..."
Rebuilding bggy5...
gcc -o bggy5 -Wl,-Bdynamic -lpthread -ldl buggy.c
ldd bggy5
libpthread.so.1 => /lib/libpthread.so.1
libdl.so.1 =>/lib/libdl.so.1
libc.so.1 => /lib/libc.so.1
libm.so.2 => /lib/libm.so.2
echo "The nm output of bggy5 should ideally not contain any Absolute symbols at
address 0x"
The nm output of bggy5 should ideally not contain any Absolute symbols at
address 0x
nm -D bggy5 | grep '\(pthr\|dlop\)'
U dlopen
U pthread_mutex_destroy
U pthread_mutex_init
echo ""
gcc (GCC) 4.0.3 (GNU_Solaris 4.0.3-1nexenta6)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
GNU ld version 2.16.91 20060118 NexentaOS GNU/OpenSolaris
Copyright 2005 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License. This program has absolutely no wa
