[SOLVED] [Bug] Slackware64-14.2 gcc fails to link with libmvec_nonshared.a

guanx · 08-15-2016, 03:42 PM

Hello,

The "/usr/lib64/libm.so" is a link to "/lib64/libm.so.6", which causes link failure. This file should probably be a script instead:

Code:

/* GNU ld script
*/
OUTPUT_FORMAT(elf64-x86-64)
GROUP ( /lib64/libm.so.6  AS_NEEDED ( /usr/lib64/libmvec_nonshared.a /lib64/libmvec.so.1 ) )

according to this discussion.

kjhambrick · 08-16-2016, 08:22 AM

Good Catch guanx !

In the slackware64/l/glibc-2.23-x86_64-1.txz Package, the original content of usr/lib64/libm.so is:

Code:

# cd /tmp && mkdir glibc-2.23 && cd glibc-2.23 && tar xvf /home/dld/slackware/slackware-14.2-64/slackware64/l/glibc-2.23-x86_64-1.txz
# file usr/lib64/libm.so

usr/lib64/libm.so: ASCII text

# cat usr/lib64/libm.so

/* GNU ld script
*/
OUTPUT_FORMAT(elf64-x86-64)
GROUP ( /lib64/libm.so.6  AS_NEEDED ( /usr/lib64/libmvec_nonshared.a /lib64/libmvec.so.1 ) )

It looks like the original content of usr/lib64/libm.so was overwritten by the install/doinst.sh script for glibc.

Also broken in my multilib glibc-2.23_multilib-x86_64-1alien

I wonder why they would name an ld script with a .so extent ?

And I wonder if there are other .so files like this in the original build ?

-- kjh

kjhambrick · 08-16-2016, 08:47 AM

Answer my own Q ...

These are the .so files in the original gcc-2.23 Package that are not Shared Object Libs:

Code:

# file $(find . -type f -iname "*.so") |grep -v 'ELF 64-bit LSB shared object'

./usr/lib64/libc.so:                      ASCII text
./usr/lib64/libm.so:                      ASCII text
./usr/lib64/libpthread.so:                ASCII text

These are the types of the same files in the main file system:

Code:

# file $(file $(find . -type f -iname "*.so") |grep -v 'ELF 64-bit LSB shared object' |gawk -F ':' '{ gsub( /^./, "", $1 ) ; print $1 }')
/usr/lib64/libc.so:       ASCII text
/usr/lib64/libm.so:       symbolic link to ../../lib64/libm.so.6
/usr/lib64/libpthread.so: ASCII text

It looks like only libm.so was affected:

Code:

# file $(file $(find . -type f -iname "*.so") |grep -v 'ELF 64-bit LSB shared object' |gawk -F ':' '{ gsub( /^./, "", $1 ) ; print $1 }') |gawk -F ':' '{ printf "#### testing " $1 ": \t" ; RetCode = system( "diff -b " "." $1 " " $1 ) ; if ( RetCode == 0 ){ print "OK" }}'

#### testing /usr/lib64/libc.so:        OK
#### testing /usr/lib64/libm.so:        Binary files ./usr/lib64/libm.so and /usr/lib64/libm.so differ
#### testing /usr/lib64/libpthread.so:  OK

-- kjh

Wiser Slacker · 08-16-2016, 10:31 AM

it is not in the install script doinst.sh and did not come from the gcc- package ...

found it in glibc- package in doinst.sh

kjhambrick · 08-16-2016, 10:52 AM

Sorry Wiser Slacker,

That's what I meant in Post #2 -- the install/doinst.sh script from the glibc Package is overwriting the linker script file as a symlink.

See lines 148 and 149.

EDIT: p.s. the fix looks about the same as for libpthread.so at lines 138 and 139

-- kjh

# one way to print install/doinst.sh with numbered lines.
#
# cd /tmp/glibc-2.23 ; gawk '{ printf( "%3d: %s\n", FNR, $0 )}' install/doinst.sh

Code:

  1: #!/bin/sh
  2: # Copyright (C) 2002, 2005  Slackware Linux, Inc.
  3: # Copyright 2005, 2006, 2007, 2011, 2012  Patrick J. Volkerding, Sebeka, Minnesota, USA
  4: #
  5: # This program is free software; you can redistribute it and/or
  6: # modify it under the terms of the GNU General Public License
  7: # as published by the Free Software Foundation; either version 2
  8: # of the License, or (at your option) any later version.
  9: #
 10: # This program is distributed in the hope that it will be useful,
 11: # but WITHOUT ANY WARRANTY; without even the implied warranty of
 12: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13: # GNU General Public License for more details.
 14: #
 15: # Swap glibc on the fly.
 16: #
 17: # If we're on a running system we have to handle this _very_ carefully.  :-)
 18: # The tricks involved here get trickier every time...
 19: 
 20: # OK, now we have to be sure of a few things.  First, you do have a 2.6
 21: # kernel running, right?
 22: 
 23: if [ -r /proc/ksyms ]; then
 24:   echo "FATAL: you need to be running a 2.6.x kernel in order to upgrade"
 25:   echo "to this version of glibc."
 26:   echo
 27:   sleep 999
 28:   exit 1
 29: fi
 30: 
 31: # Next, stop using the /lib64/ntpl libraries.  These are now obsolete and
 32: # will break the installation if present:
 33: if [ -d lib64/tls ]; then
 34:   mkdir -p lib64/obsolete
 35:   mv lib64/tls lib64/obsolete
 36: fi
 37: if [ -x sbin/ldconfig ]; then
 38:   sbin/ldconfig -r .
 39: fi
 40: 
 41: # Install NPTL glibc libraries:
 42: if [ -x /sbin/ldconfig -a -d lib64/incoming ]; then # swap on the fly
 43:   # First create copies of the incoming libraries:
 44:   ( cd lib64/incoming
 45:     for file in * ; do
 46:       if [ ! -r ../${file}.incoming ]; then
 47:         cp -a $file ../${file}.incoming
 48:       fi
 49:     done
 50:   )
 51:   # Then switch to them all at once:
 52:   /sbin/ldconfig -l lib64/*.incoming 2> /dev/null
 53:   # Finally, rename them and clean up:
 54:   ( cd lib64
 55:     for file in *.incoming ; do
 56:       rm -f `basename $file .incoming`
 57:       cp -a $file `basename $file .incoming`
 58:       /sbin/ldconfig -l `basename $file .incoming`
 59:       rm -f $file
 60:     done
 61:   )
 62: else # no ldconfig?  Good, it's safe to just jam it on home (and make links below):
 63:   ( cd lib64/incoming
 64:     for file in * ; do
 65:       cp -a $file ..
 66:     done
 67:   )
 68: fi
 69: # Now, get rid of the temporary directory:
 70: rm -rf lib64/incoming
 71: # Done installing NPTL glibc libraries.
 72: 
 73: # Handle config files:
 74: config() {
 75:   NEW="$1"
 76:   OLD="$(dirname $NEW)/$(basename $NEW .new)"
 77:   # If there's no config file by that name, mv it over:
 78:   if [ ! -r $OLD ]; then
 79:     mv $NEW $OLD
 80:   elif [ "$(cat $OLD | md5sum)" = "$(cat $NEW | md5sum)" ]; then # toss the redundant copy
 81:     rm $NEW
 82:   fi
 83:   # Otherwise, we leave the .new copy for the admin to consider...
 84: }
 85: config etc/nscd.conf.new
 86: config etc/profile.d/glibc.csh.new
 87: config etc/profile.d/glibc.sh.new
 88: # Clearly you already decided this issue.  :-)
 89: rm -f etc/profile.d/glibc.csh.new
 90: rm -f etc/profile.d/glibc.sh.new
 91: 
 92: # In case there's no ldconfig, make the links manually:
 93: if [ ! -x /sbin/ldconfig ]; then
 94: ( cd lib64 ; rm -rf libnss_nis.so.2 )
 95: ( cd lib64 ; ln -sf libnss_nis-2.23.so libnss_nis.so.2 )
 96: ( cd lib64 ; rm -rf libm.so.6 )
 97: ( cd lib64 ; ln -sf libm-2.23.so libm.so.6 )
 98: ( cd lib64 ; rm -rf libnss_files.so.2 )
 99: ( cd lib64 ; ln -sf libnss_files-2.23.so libnss_files.so.2 )
100: ( cd lib64 ; rm -rf libresolv.so.2 )
101: ( cd lib64 ; ln -sf libresolv-2.23.so libresolv.so.2 )
102: ( cd lib64 ; rm -rf libnsl.so.1 )
103: ( cd lib64 ; ln -sf libnsl-2.23.so libnsl.so.1 )
104: ( cd lib64 ; rm -rf libutil.so.1 )
105: ( cd lib64 ; ln -sf libutil-2.23.so libutil.so.1 )
106: ( cd lib64 ; rm -rf libnss_compat.so.2 )
107: ( cd lib64 ; ln -sf libnss_compat-2.23.so libnss_compat.so.2 )
108: ( cd lib64 ; rm -rf libthread_db.so.1 )
109: ( cd lib64 ; ln -sf libthread_db-1.0.so libthread_db.so.1 )
110: ( cd lib64 ; rm -rf libnss_hesiod.so.2 )
111: ( cd lib64 ; ln -sf libnss_hesiod-2.23.so libnss_hesiod.so.2 )
112: ( cd lib64 ; rm -rf libanl.so.1 )
113: ( cd lib64 ; ln -sf libanl-2.23.so libanl.so.1 )
114: ( cd lib64 ; rm -rf libcrypt.so.1 )
115: ( cd lib64 ; ln -sf libcrypt-2.23.so libcrypt.so.1 )
116: ( cd lib64 ; rm -rf libBrokenLocale.so.1 )
117: ( cd lib64 ; ln -sf libBrokenLocale-2.23.so libBrokenLocale.so.1 )
118: ( cd lib64 ; rm -rf ld-linux-x86-64.so.2 )
119: ( cd lib64 ; ln -sf ld-2.23.so ld-linux-x86-64.so.2 )
120: ( cd lib64 ; rm -rf libdl.so.2 )
121: ( cd lib64 ; ln -sf libdl-2.23.so libdl.so.2 )
122: ( cd lib64 ; rm -rf libnss_dns.so.2 )
123: ( cd lib64 ; ln -sf libnss_dns-2.23.so libnss_dns.so.2 )
124: ( cd lib64 ; rm -rf libpthread.so.0 )
125: ( cd lib64 ; ln -sf libpthread-2.23.so libpthread.so.0 )
126: ( cd lib64 ; rm -rf libnss_nisplus.so.2 )
127: ( cd lib64 ; ln -sf libnss_nisplus-2.23.so libnss_nisplus.so.2 )
128: ( cd lib64 ; rm -rf libc.so.6 )
129: ( cd lib64 ; ln -sf libc-2.23.so libc.so.6 )
130: ( cd lib64 ; rm -rf librt.so.1 )
131: ( cd lib64 ; ln -sf librt-2.23.so librt.so.1 )
132: fi
133: 
134: # More links:
135: ( cd usr/lib64 ; rm -rf libnss_nisplus.so )
136: ( cd usr/lib64 ; ln -sf ../../lib64/libnss_nisplus.so.2 libnss_nisplus.so )
137: # This is now a linker script:
138: #( cd usr/lib64 ; rm -rf libpthread.so )
139: #( cd usr/lib64 ; ln -sf ../../lib64/libpthread.so.0 libpthread.so )
140: ( cd usr/lib64 ; rm -rf libresolv.so )
141: ( cd usr/lib64 ; ln -sf ../../lib64/libresolv.so.2 libresolv.so )
142: ( cd usr/lib64 ; rm -rf libnsl.so )
143: ( cd usr/lib64 ; ln -sf ../../lib64/libnsl.so.1 libnsl.so )
144: ( cd usr/lib64 ; rm -rf libnss_hesiod.so )
145: ( cd usr/lib64 ; ln -sf ../../lib64/libnss_hesiod.so.2 libnss_hesiod.so )
146: ( cd usr/lib64 ; rm -rf libnss_files.so )
147: ( cd usr/lib64 ; ln -sf ../../lib64/libnss_files.so.2 libnss_files.so )
148: ( cd usr/lib64 ; rm -rf libm.so )
149: ( cd usr/lib64 ; ln -sf ../../lib64/libm.so.6 libm.so )
150: ( cd usr/lib64 ; rm -rf libutil.so )
151: ( cd usr/lib64 ; ln -sf ../../lib64/libutil.so.1 libutil.so )
152: ( cd usr/lib64 ; rm -rf libnss_compat.so )
153: ( cd usr/lib64 ; ln -sf ../../lib64/libnss_compat.so.2 libnss_compat.so )
154: ( cd usr/lib64 ; rm -rf libthread_db.so )
155: ( cd usr/lib64 ; ln -sf ../../lib64/libthread_db.so.1 libthread_db.so )
156: ( cd usr/lib64 ; rm -rf libcrypt.so )
157: ( cd usr/lib64 ; ln -sf ../../lib64/libcrypt.so.1 libcrypt.so )
158: ( cd usr/lib64 ; rm -rf libBrokenLocale.so )
159: ( cd usr/lib64 ; ln -sf ../../lib64/libBrokenLocale.so.1 libBrokenLocale.so )
160: ( cd usr/lib64 ; rm -rf libdl.so )
161: ( cd usr/lib64 ; ln -sf ../../lib64/libdl.so.2 libdl.so )
162: ( cd usr/lib64 ; rm -rf libnss_dns.so )
163: ( cd usr/lib64 ; ln -sf ../../lib64/libnss_dns.so.2 libnss_dns.so )
164: ( cd usr/lib64 ; rm -rf librt.so )
165: ( cd usr/lib64 ; ln -sf ../../lib64/librt.so.1 librt.so )
166: ( cd usr/lib64 ; rm -rf libanl.so )
167: ( cd usr/lib64 ; ln -sf ../../lib64/libanl.so.1 libanl.so )
168: ( cd usr/lib64 ; rm -rf libnss_nis.so )
169: ( cd usr/lib64 ; ln -sf ../../lib64/libnss_nis.so.2 libnss_nis.so )
170: ( cd usr/share/zoneinfo ; rm -rf localtime )
171: ( cd usr/share/zoneinfo ; ln -sf /etc/localtime localtime )
172: ( cd bin ; rm -rf sln )
173: ( cd bin ; ln -sf /sbin/sln sln )
174: 
175: # Reload to prevent init from holding a stale handle to glibc on shutdown:
176: if [ -x /sbin/telinit ]; then
177:   /sbin/telinit u
178: fi

Wiser Slacker · 08-16-2016, 11:14 AM

i am old - i have to write it down

and i have had the wrong package - you are right ...

but who takes these things into distro - hope someone would read that ...

kjhambrick · 08-16-2016, 11:44 AM

Wiser Slacker --

Pat and his crew watch LQ and I imagine someone will see this thread and issue a patched Package.

I've already fixed /usr/lib64/libm.so on my system by replacing the symlink with the linker script.

I tested it with the test program guanx posted on Sourceware Bugzilla – Bug 20469

His test program failed to compile on my un-altered 14.2 exactly like he showed in the other site.

After fixing /usr/lib64/libm.so it worked as expected.

-- kjh

Toutatis · 08-16-2016, 12:06 PM

I have slackware64-current
Why did not I never had problems when linking many times with "-lm", but it fails with the test program in https://sourceware.org/bugzilla/show_bug.cgi?id=20469 ?

khronosschoty · 08-16-2016, 12:19 PM

So whats the fix here I keep reading through but I'm not sure what the immediate fix is?

kjhambrick · 08-16-2016, 12:36 PM

Quote:

Originally Posted by Toutatis

I have slackware64-current
Why did not I never had problems when linking many times with "-lm", but it fails with the test program in https://sourceware.org/bugzilla/show_bug.cgi?id=20469 ?

Toutatis --

The compiler flags and pragmas in guanx's test program invoked some rather esoteric parallel programming code.

Try `man gcc` -- each of guanx's gcc -f flags and the #pragmas in his C-Program are in the man page and there is also a reference to The OpenMP® API specification for parallel programming in `man gcc`.

Not something you'll see every day but when you need it, you need it

-- kjh

kjhambrick · 08-16-2016, 12:41 PM

Quote:

Originally Posted by khronosschoty

So whats the fix here I keep reading through but I'm not sure what the immediate fix is?

khronosschoty --

You may not need an immediate fix.

If not, it might be safer to wait for Pat's Patch.

If you need it, you could replace the symlink /usr/lib64/libm.so with a text file that contains the code in guanx's Post #1.

-- kjh

guanx · 08-06-2017, 09:21 PM

I vaguely remember this bug has been fixed quite a while ago but with glibc-2.23-x86_64-3_slack14.2 it came back.

guanx · 08-10-2017, 02:13 AM

Quote:

patches/packages/glibc-2.23-x86_64-4_slack14.2.txz: Rebuilt.
Fixed a regression with the recent glibc patch packages:
Don't clobber the libm.so linker script with a symlink.

Thanks for the fix!