Package: libzvbi0
Version: 0.2.35-15
Severity: normal
File: /usr/lib/x86_64-linux-gnu/libzvbi-chains.so.0.0.0
User: debian...@lists.debian.org
Usertags: undefined-symbol adequate
libzvbi-chains.so needs to link with -ldl, see the output of adequate,
symtree and objdump below. I detected this on amd64 but the Debian
build log scanner also detected dpkg-buildpackage complaining about it
on most architectures, see the w3m/getbuildlog output below.
I filed this bug at severity minor since I'm not sure if there are any
programs using the zvbi-chains lib or if they already use the libdl
symbols and link with the -ldl flag or not.
This bug report brought to you by adequate:
http://bonedaddy.net/pabs3/log/2013/02/23/inadequate-software/
$ adequate libzvbi0
libzvbi0:amd64: undefined-symbol
/usr/lib/x86_64-linux-gnu/libzvbi-chains.so.0.0.0 => dlsym
$ man adequate | grep -A4 undefined-symbol
undefined-symbol
The symbol has not been found in the libraries linked with the
binary.
Either the binary either needs to be linked with an additional
shared library,
or the dependency on the shared library package that provides this
symbol is too weak.
References: Debian Policy §3.5, §8.6, §10.2.
$ lddtree /usr/lib/x86_64-linux-gnu/libzvbi-chains.so.0.0.0
libzvbi-chains.so.0.0.0 => /usr/lib/x86_64-linux-gnu/libzvbi-chains.so.0.0.0
(interpreter => none)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
ld-linux-x86-64.so.2 => /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6
libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6
$ symtree /usr/lib/x86_64-linux-gnu/libzvbi-chains.so.0.0.0
/usr/lib/x86_64-linux-gnu/libzvbi-chains.so.0.0.0
libpthread.so.0 =>
pthread_testcancel,accept,recv,connect,__errno_location,send
libm.so.6 => !?! useless link !?!
libpng16.so.16 => !?! useless link !?!
libz.so.1 => !?! useless link !?!
libc.so.6 =>
socket,fflush,strcpy,gai_strerror,strrchr,dcgettext,connect,__fdelt_chk,inet_ntoa,time,__stack_chk_fail,__lxstat,unlink,listen,select,realloc,getpid,strdup,strftime,chmod,__assert_fail,gmtime,strtol,mmap,calloc,strlen,send,openlog,getaddrinfo,__errno_location,bind,getnameinfo,__syslog_chk,getsockopt,__fprintf_chk,gethostbyaddr,fputc,recv,fputs,memcpy,memcpy,__vsnprintf_chk,setsockopt,malloc,__ctype_b_loc,getenv,stderr,munmap,__snprintf_chk,readlink,strncasecmp,fwrite,gettimeofday,__memcpy_chk,accept,__strcpy_chk,__cxa_finalize,freeaddrinfo,__vasprintf_chk,strcmp,strerror,__asprintf_chk,free
WEAK => _ITM_deregisterTMCloneTable,__gmon_start__,_ITM_registerTMCloneTable
UNRESOLVED => dlsym
$ objdump -T /lib/x86_64-linux-gnu/libdl.so.2 | grep -E "($(symtree
/usr/lib/x86_64-linux-gnu/libzvbi-chains.so.0.0.0 | sed -n 's/UNRESOLVED =>
//p' | tr , '|'))$"
13b0 gDF .text 00b9 GLIBC_2.2.5 dlsym
$ w3m -dump https://qa.debian.org/bls/packages/z/zvbi.html | grep -A2 symbol
• W shlibs-symbol-not-found (alpha, amd64, arm64, armel, armhf, hppa, i386,
ia64, m68k, mips, mips64el, mipsel, powerpc, powerpcspe, ppc64, ppc64el,
riscv64, s390x, sh4, sparc64, x32)
$ w3m -dump https://qa.debian.org/bls/bytag/W-shlibs-symbol-not-found.html |
grep -A12 description
description
The build logs contains a like like
dpkg-shlibdeps: warning: symbol NAME used by BINARY found in none of the
libraries.
Possible reasons:
• A library not linked with a library needed.
While this can sometimes make sense in order to allow the using binary to
decide which of multiple available implementations to use, it means that
dependency information might be incorrect, optimisations like prelinking
might fail and stuff like that.
$ chronic getbuildlog zvbi last
$ grep 'dpkg-shlibdeps: warning: symbol .* used by .* found in none of the
libraries' *.log
zvbi_0.2.35-15_alpha.log:dpkg-shlibdeps: warning: symbol dlsym used by
debian/libzvbi0/usr/lib/alpha-linux-gnu/libzvbi-chains.so.0.0.0 found in none
of the libraries
zvbi_0.2.35-15_amd64.log:dpkg-shlibdeps: warning: symbol dlsym used by
debian/libzvbi0/usr/lib/x86_64-linux-gnu/libzvbi-chains.so.0.0.0 found in none
of the libraries
zvbi_0.2.35-15_arm64.log:dpkg-shlibdeps: warning: symbol dlsym used by
debian/libzvbi0/usr/lib/aarch64-linux-gnu/libzvbi-chains.so.0.0.0 found in none
of the libraries
zvbi_0.2.35-15_armel.log:dpkg-shlibdeps: warning: symbol dlsym used by
debian/libzvbi0/usr/lib/arm-linux-gnueabi/libzvbi-chains.so.0.0.0 found in none
of the libraries
zvbi_0.2.35-15_armhf.log:dpkg-shlibdeps: warning: symbol dlsym used by
debian/libzvbi0/usr/lib/arm-linux-gnueabihf/libzvbi-chains.so.0.0.0 found in
none of the libraries
zvbi_0.2.35-15_hppa.log:dpkg-shlibdeps: warning: symbol dlsym used by
debian/libzvbi0/usr/lib/hppa-linux-gnu/libzvbi-chains.so.0.0.0 found
