#890228 libexpect.so: undefined symbols: needs to link with Tcl

Package:
tcl-expect
Source:
expect
Description:
Automates interactive applications (Tcl package)
Submitter:
Paul Wise
Date:
2021-09-22 04:48:02 UTC
Severity:
minor
Tags:
#890228#5
Date:
2018-02-12 08:27:47 UTC
From:
To:
libexpect.so needs to link with Tcl, 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 other architectures, see the w3m and build log output below.

I filed this bug at severity minor since it looks like the code using
libexpect.so (expect, skycat) also already uses Tcl libs.

This bug report brought to you by adequate:

http://bonedaddy.net/pabs3/log/2013/02/23/inadequate-software/

$ adequate tcl-expect
tcl-expect:amd64: undefined-symbol /usr/lib/x86_64-linux-gnu/libexpect.so.5.45.4 => Tcl_ErrnoMsg
tcl-expect:amd64: undefined-symbol /usr/lib/x86_64-linux-gnu/libexpect.so.5.45.4 => Tcl_Free
tcl-expect:amd64: undefined-symbol /usr/lib/x86_64-linux-gnu/libexpect.so.5.45.4 => Tcl_Alloc

$ 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/libexpect.so.5.45.4
libexpect.so.5.45.4 => /usr/lib/x86_64-linux-gnu/libexpect.so.5.45.4 (interpreter => none)
    libutil.so.1 => /lib/x86_64-linux-gnu/libutil.so.1
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6
        ld-linux-x86-64.so.2 => /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6

$ symtree /usr/lib/x86_64-linux-gnu/libexpect.so.5.45.4
/usr/lib/x86_64-linux-gnu/libexpect.so.5.45.4
    libutil.so.1 => openpty
    libm.so.6 => log,pow
    libc.so.6 => fflush,strcpy,__printf_chk,exit,srand,fopen,strncmp,optind,wait,__longjmp_chk,pipe,perror,__isoc99_sscanf,signal,strncpy,__vsprintf_chk,fork,time,__stack_chk_fail,unlink,realloc,abort,stdin,getpid,strftime,gmtime,strtol,isatty,feof,fgets,strlen,strstr,strcspn,tcsendbreak,__errno_location,tcsetattr,read,ttyname,getopt,dup2,__fprintf_chk,__sigsetjmp,stdout,memcpy,memcpy,rand,malloc,__ctype_b_loc,getenv,optarg,stderr,ioctl,alarm,system,dup,execvp,freopen,fileno,fwrite,waitpid,close,open,localtime,strchr,__vfprintf_chk,fdopen,tcgetattr,sleep,__strcpy_chk,__cxa_finalize,setsid,fcntl,__sprintf_chk,link,__xstat,memmove,_IO_getc,__strcat_chk,setbuf,strcmp,write,free
    WEAK => _ITM_deregisterTMCloneTable,__gmon_start__,_ITM_registerTMCloneTable
    UNRESOLVED => Tcl_Free,Tcl_Alloc,Tcl_ErrnoMsg

$ objdump -T /usr/lib/x86_64-linux-gnu/libtcl8.6.so.0 | grep -E "($(symtree /usr/lib/x86_64-linux-gnu/libexpect.so.5.45.4 | sed -n 's/    UNRESOLVED => //p' | tr , '|'))$"
0000000000117f30 g    DF .text	00000000000003db  Base        Tcl_ErrnoMsg
000000000004af60 g    DF .text	0000000000000005  Base        Tcl_Free
000000000004ae20 g    DF .text	0000000000000021  Base        Tcl_Alloc

$ w3m -dump https://qa.debian.org/bls/packages/e/expect.html | grep -A2 symbol
  • W shlibs-symbol-not-found (alpha, arm64, armel, armhf, hppa, hurd-i386,
    i386, ia64, m68k, mips, mips64el, mipsel, powerpc, powerpcspe, ppc64,
    ppc64el, 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 expect last

$ grep 'dpkg-shlibdeps: warning: symbol .* used by .* found in none of the libraries' *.log
expect_5.45.4-1_alpha.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/alpha-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_alpha.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/alpha-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_alpha.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/alpha-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_arm64.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/aarch64-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_arm64.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/aarch64-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_arm64.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/aarch64-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_armel.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/arm-linux-gnueabi/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_armel.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/arm-linux-gnueabi/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_armel.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/arm-linux-gnueabi/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_armhf.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/arm-linux-gnueabihf/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_armhf.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/arm-linux-gnueabihf/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_armhf.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/arm-linux-gnueabihf/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_hppa.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/hppa-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_hppa.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/hppa-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_hppa.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/hppa-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_hurd-i386.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/i386-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_hurd-i386.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/i386-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_hurd-i386.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/i386-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_i386.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/i386-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_i386.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/i386-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_i386.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/i386-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_ia64.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/ia64-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_ia64.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/ia64-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_ia64.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/ia64-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_m68k.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/m68k-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_m68k.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/m68k-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_m68k.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/m68k-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_mips64el.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/mips64el-linux-gnuabi64/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_mips64el.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/mips64el-linux-gnuabi64/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_mips64el.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/mips64el-linux-gnuabi64/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_mipsel.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/mipsel-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_mipsel.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/mipsel-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_mipsel.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/mipsel-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_mips.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/mips-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_mips.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/mips-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_mips.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/mips-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_powerpc.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/powerpc-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_powerpc.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/powerpc-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_powerpc.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/powerpc-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_powerpcspe.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/powerpc-linux-gnuspe/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_powerpcspe.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/powerpc-linux-gnuspe/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_powerpcspe.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/powerpc-linux-gnuspe/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_ppc64el.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/powerpc64le-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_ppc64el.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/powerpc64le-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_ppc64el.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/powerpc64le-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_ppc64.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/powerpc64-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_ppc64.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/powerpc64-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_ppc64.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/powerpc64-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_s390x.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/s390x-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_s390x.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/s390x-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_s390x.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/s390x-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_sh4.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/sh4-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_sh4.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/sh4-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_sh4.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/sh4-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_sparc64.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/sparc64-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_sparc64.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/sparc64-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_sparc64.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/sparc64-linux-gnu/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_x32.log:dpkg-shlibdeps: warning: symbol Tcl_Alloc used by debian/tcl-expect/usr/lib/x86_64-linux-gnux32/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_x32.log:dpkg-shlibdeps: warning: symbol Tcl_ErrnoMsg used by debian/tcl-expect/usr/lib/x86_64-linux-gnux32/libexpect.so.5.45.4 found in none of the libraries
expect_5.45.4-1_x32.log:dpkg-shlibdeps: warning: symbol Tcl_Free used by debian/tcl-expect/usr/lib/x86_64-linux-gnux32/libexpect.so.5.45.4 found in none of the libraries
#890228#10
Date:
2018-02-17 07:37:11 UTC
From:
To:
tags 890228 + moreinfo
thanks

Hi Paul,

Well, I know that and I'd like to keep it underlinked in order to make
it possible to link with libtlc8.5 or libtcl8.6 for application which use it.
The libtcl ABI is sufficiently stable and I don't want to restrict libexpect
to any particular version of libtcl.

The libexpect manual explicitly says that any application using libexpect
has to be linked with it and with libtcl.

If there's another reason why it shouldn't be underlinked I'd be glad
to hear it.

Cheers!
#890228#17
Date:
2018-02-17 07:51:10 UTC
From:
To:
I see, I was not aware of this.

I note that libtcl does not use symbol versioning. In other cases of
mixing two versions of a library in the same process without symbol
versioning, this results in crashes. Does libtcl ABI avoid these issues?

Is this enforced in some way?

Nothing apart for the usual reasons for avoiding underlinking.

Control: tags -1 + moreinfo
#890228#24
Date:
2021-09-22 04:22:54 UTC
From:
To:
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