Public bug reported:
I have installed libc6-dbg and have the /usr/lib/debug directory.
However, I cannot get my application to actually link against the
libraries in this directory to have access to the debug symbols. This
appears to be related to some symlink problems.
I have written a trivial Hello, World! program and compiled it as:
a...@danu:~/test/c$ gcc -Wall helloworld.c
a...@danu:~/test/c$ ./a.out
Hello, world!
I then run ldd on the executable and see that it linked against the normal
libc.so:
a...@danu:~/test/c$ ldd a.out
linux-gate.so.1 => (0x007a3000)
libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0x00dfc000)
/lib/ld-linux.so.2 (0x00470000)
Similarly, even when running:
a...@danu:~/test/c$ LD_LIBRARY_PATH=/usr/lib/debug/lib
LD_TRACE_LOADED_OBJECTS=1 ./a.out
linux-gate.so.1 => (0x0084d000)
libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0x00ae3000)
/lib/ld-linux.so.2 (0x00aa7000)
I also tried running gcc with a -L option, but got the same results:
a...@danu:~/test/c$ gcc -Wall helloworld.c -L/usr/lib/debug/lib/
a...@danu:~/test/c$ ldd a.out
linux-gate.so.1 => (0x004ad000)
libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0x00110000)
/lib/ld-linux.so.2 (0x00360000)
a...@danu:~/test/c$ LD_LIBRARY_PATH=/usr/lib/debug/lib
LD_TRACE_LOADED_OBJECTS=1 ./a.out
linux-gate.so.1 => (0x00cd7000)
libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0x008b4000)
/lib/ld-linux.so.2 (0x00c01000)
It appears to be linking against libc.so.6, which does not exist in
/usr/lib/debug. Indeed, even /lib/tls/i686/cmov/libc.so.6 is a symlink
to /lib/tls/i686/cmov/libc-2.11.1.so. There does, however, exist a
/usr/lib/debug/lib/libc-2.11.1.so. Therefore, I tried making a symlink:
a...@danu:~/test/c$ sudo ln -s /usr/lib/debug/lib/libc-2.11.1.so
/usr/lib/debug/lib/libc.so.6
a...@danu:~/test/c$ LD_LIBRARY_PATH=/usr/lib/debug/lib
LD_TRACE_LOADED_OBJECTS=1 ./a.out
Segmentation fault
We see a new result, implying that the link therefore works, but it's a
segfault, which is obviously less good :).
My system information is:
a...@danu:~/test/c$ lsb_release -rd
Description: Ubuntu 10.04 LTS
Release: 10.04
a...@danu:~/test/c$ apt-cache policy libc6-dbg
libc6-dbg:
Installed: 2.11.1-0ubuntu7.1
Candidate: 2.11.1-0ubuntu7.1
Version table:
*** 2.11.1-0ubuntu7.1 0
500 http://us.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages
500 http://security.ubuntu.com/ubuntu/ lucid-security/main Packages
100 /var/lib/dpkg/status
2.11.1-0ubuntu7 0
500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages
Thank you very much. If I can provide any information, please let me know.
** Affects: eglibc (Ubuntu)
Importance: Undecided
Status: New
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libc6-dbg: cannot link against debug libraries
https://bugs.launchpad.net/bugs/591582
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