* newB: How to debug system lib
@ 2004-10-14 15:37 Russell Shaw
0 siblings, 0 replies; 3+ messages in thread
From: Russell Shaw @ 2004-10-14 15:37 UTC (permalink / raw)
To: gdb
Hi,
I linked my program with:
gcc -g -O0 -lm -o test main.o
ldd test gives:
libm.so.6 => /usr/lib/debug/libm.so.6 (0x40018000)
libc.so.6 => /usr/lib/debug/libc.so.6 (0x4003a000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
I had: LD_LIBRARY_PATH="/usr/lib/debug"
In gdb, list 'ungetc' (a gnu libc function) gives:
No line number information available for address 0x400af9a0 <ungetc>
I cannot step into the function either.
Is there a way of doing this without statically linking?
(debian 2.6.8.1, libc6 2.3.2.ds1-17, gcc 3.4.2)
Also, does gdb need the libc source code files in addition
to the libc6-dbg binaries?
^ permalink raw reply [flat|nested] 3+ messages in thread* newB: How to debug system lib
@ 2004-10-14 11:56 Russell Shaw
2004-10-14 19:01 ` Michael Chastain
0 siblings, 1 reply; 3+ messages in thread
From: Russell Shaw @ 2004-10-14 11:56 UTC (permalink / raw)
To: gdb
Hi,
I linked my program with:
gcc -g -O0 -lm -o test main.o
ldd test gives:
libm.so.6 => /usr/lib/debug/libm.so.6 (0x40018000)
libc.so.6 => /usr/lib/debug/libc.so.6 (0x4003a000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
I had: LD_LIBRARY_PATH="/usr/lib/debug"
In gdb, list 'ungetc' (a gnu libc function) gives:
No line number information available for address 0x400af9a0 <ungetc>
I cannot step into the function either.
Is there a way of doing this without statically linking?
(debian 2.6.8.1, libc6 2.3.2.ds1-17, gcc 3.4.2)
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: newB: How to debug system lib
2004-10-14 11:56 Russell Shaw
@ 2004-10-14 19:01 ` Michael Chastain
0 siblings, 0 replies; 3+ messages in thread
From: Michael Chastain @ 2004-10-14 19:01 UTC (permalink / raw)
To: rjshaw, gdb
Russell Shaw <rjshaw@netspace.net.au> wrote:
> In gdb, list 'ungetc' (a gnu libc function) gives:
>
> No line number information available for address 0x400af9a0 <ungetc>
>
> I cannot step into the function either.
Try this:
(gdb) break main
(gdb) run
(gdb) disassemble ungetc
(gdb) list ungetc
The "break main; run" will run your test program far enough to load
the shared library (glibc). gdb will see the shared library after
it is loaded.
Hope this helps,
Michael Chastain
^ permalink raw reply [flat|nested] 3+ messages in thread
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