[Bug c++/12911] New: Cannot Debug Custom Shared Library (CentOS 5.6/gdb 7.2)

[Bug c++/12911] New: Cannot Debug Custom Shared Library (CentOS 5.6/gdb 7.2)

[dennis.mcwherter at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12911

           Summary: Cannot Debug Custom Shared Library (CentOS 5.6/gdb
                    7.2)
           Product: gdb
           Version: 7.2
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned@sourceware.org
        ReportedBy: dennis.mcwherter@gmail.com


Hello,

I have been trying now for several days (without any bit of success) to step
through a shared library I am building - I set a null pointer in the library to
force a core dump and to see whether or not I was able to debug - I cannot. I
can step through all the functions in my dummy executable binary, but when I
get to the shared library, it fails.

I am building the library (and all its objects) using:

CFLAGS=-Wall -O0 -g3 -fPIC

and the executable binary with this:

CFLAGS=-Wall -O0 -g3

Now, when I load everything in gdb, it says that the symbols are loaded, but I
cannot step into the function. Here is an example:

(gdb) info sharedlibrary
>From        To          Syms Read   Shared Object Library
0x005577f0  0x0056cf1f  Yes (*)     /lib/ld-linux.so.2
0x00cb9f20  0x00cf59e4  Yes (*)     /usr/lib/libGL.so.1
0x00738720  0x009abc04  Yes        
/home/raged/MyLIB/memtest/../lib/libMyLIB.so.0
0x0273ec50  0x027ba174  Yes (*)     /usr/lib/libstdc++.so.6
0x00113410  0x0012e594  Yes (*)     /lib/libm.so.6
0x02502660  0x02509f34  Yes (*)     /lib/libgcc_s.so.1
0x0014ec80  0x0024a290  Yes (*)     /lib/libc.so.6
0x002a6f70  0x003378a4  Yes (*)     /usr/lib/libX11.so.6
0x003975e0  0x003a1324  Yes (*)     /usr/lib/libXext.so.6
0x02b8fa80  0x02b92734  Yes (*)     /usr/lib/libXxf86vm.so.1
0x003a9210  0x003b4a74  Yes (*)     /lib/libpthread.so.0
0x003bea70  0x003bfaa4  Yes (*)     /lib/libdl.so.2
0x00d97b10  0x00d9b444  Yes (*)     /usr/lib/libdrm.so.2
0x003c3950  0x003c4604  Yes (*)     /usr/lib/libXau.so.6
0x003c6e30  0x003c8a74  Yes (*)     /usr/lib/libXdmcp.so.6
(*): Shared library is missing debugging information.


Now, when I attempt to debug the core file, here is the problem:

Reading symbols from /home/raged/MyLIB/memtest/memtest...done.
[New Thread 7800]
Reading symbols from /usr/lib/libGL.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libGL.so.1
Reading symbols from /home/raged/MyLIB/memtest/../lib/libMyLIB.so.0...done.
Loaded symbols for /home/raged/MyLIB/memtest/../lib/libMyLIB.so.0
Reading symbols from /usr/lib/libstdc++.so.6...(no debugging symbols
found)...done.
Loaded symbols for /usr/lib/libstdc++.so.6


As you can see, the library symbols are indeed loaded, but I cannot step into
it (or debug it at all for that matter). Any ideas as to why this may happen?

Regards,
Dennis McWherter

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[Bug c++/12911] Cannot Debug Custom Shared Library (CentOS 5.6/gdb 7.2)

[dennis.mcwherter at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12911

Dennis McWherter <dennis.mcwherter at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dennis.mcwherter at gmail
                   |                            |dot com

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[Bug c++/12911] Cannot Debug Custom Shared Library (CentOS 5.6/gdb 7.2)

[tromey at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12911

Tom Tromey <tromey at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |WAITING
                 CC|                            |tromey at redhat dot com

--- Comment #1 from Tom Tromey <tromey at redhat dot com> 2012-02-23 19:15:32 UTC ---
Is this still an issue for you?

There isn't enough information here to say what the problem might be.

However, you said:

> Now, when I attempt to debug the core file, here is the problem:

and

> I cannot step into it

You can't 'step' when debugging a core file, because a core file is
not a live process.

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[Bug c++/12911] Cannot Debug Custom Shared Library (CentOS 5.6/gdb 7.2)

[dennis.mcwherter at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12911

Dennis McWherter <dennis.mcwherter at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |FIXED

--- Comment #2 from Dennis McWherter <dennis.mcwherter at gmail dot com> 2012-02-23 19:27:10 UTC ---
The problem was my end (I did solve this issue a few days after posting this
originally). The problem was that in my unit tests, I was using a deprecated
method to initialize a pointer and, therefore, the actual object was not being
created. Once I updated the function call, all work as planned. Thanks.

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