Public bug reported:
Description: Ubuntu oneiric (development branch)
Release: 11.10
I have a C++ project that built fine in an up to date Ubuntu 11.04
environment. After I upgraded this system to Ubuntu 11.10 pre-release, I
am now receiving a linker error that there is an undefined symbol. The
program uses privately built copies of libcurl and libssl and the libssl
libraries and sets LD_LIBRARY_PATH appropriately. The -lssl and -lcurl
options ARE being passed to g++ in the link step. The private copy of
libssl.a DOES contain that symbol that ld is complaining about. I tried
swapping out to a known good version of "ld" but with the same results
so I am not convinced that the linker is to blame. Also python complains
about llibssl.so and libcrypto.so missing version information. I think
that perhaps the shared objects are not being built with correct symbols
or the loader doesn't understand how to read them. The output of several
commands is below. I thought maybe this had something to do with the
stricter DSO linking rules but that doesn't explain why the symbol
APPEARS in the text section of libssl.a, which I am linking to with
-lssl, and yet ld complains that it is undefined.
$make
... truncated for brevity ...
/usr/bin/ld: /home/user1/source/2.8-dev/src/lib/libcurl.so: undefined reference
to symbol 'SSL_get_verify_result'
/usr/bin/ld: note: 'SSL_get_verify_result' is defined in DSO
/home/user1/source/2.8-dev/src/lib/openssl/lib/libssl.so so try adding it to
the linker command line
/home/user1/source/2.8-dev/src/lib/openssl/lib/libssl.so: could not read
symbols: Invalid operation
collect2: ld returned 1 exit status
make[3]: *** [Target] Error 1
make[2]: *** [obj_d] Error 2
make[1]: *** [Source] Error 2
make: *** [core] Error 2
$ nm lib/openssl/lib/libssl.so | grep SSL_get_verify_result
000000000003a760 T SSL_get_verify_result
$python: /home/user1/source/2.8-dev/src/lib/openssl/lib/libcrypto.so.1.0.0: no
version information available (required by python)
python: /home/user1/source/2.8-dev/src/lib/openssl/lib/libssl.so.1.0.0: no
version information available (required by python)
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: g++ 4:4.6.1-2ubuntu3
ProcVersionSignature: Ubuntu 3.0.0-8.10-generic 3.0.1
Uname: Linux 3.0.0-8-generic x86_64
Architecture: amd64
Date: Fri Aug 12 17:33:32 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: gcc-defaults
UpgradeStatus:
Upgraded to /usr/bin/python3:
/home/jpocas/source/2.8-dev/src/lib/openssl/lib/libcrypto.so.1.0.0: no version
information available (required by /usr/bin/python3)
/usr/bin/python3:
/home/jpocas/source/2.8-dev/src/lib/openssl/lib/libssl.so.1.0.0: no version
information available (required by /usr/bin/python3)
oneiric on 2011-08-10 (1 days ago)
** Affects: gcc-defaults (Ubuntu)
Importance: Undecided
Status: New
** Tags: g++ gcc ld
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https://bugs.launchpad.net/bugs/825542
Title:
Symbol generation/lookup broken
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