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Full Discussion: gdb - loading symbols of shared library
Top Forums Programming gdb - loading symbols of shared library Post 302245984 by rimon on Sunday 12th of October 2008 07:01:59 AM
Old 10-12-2008
gdb - loading symbols of shared library
I am debugging in gdb a program that dynamically loads libodbcinst.so. I want to debug the code from libodbcinst - I can break in it, see the source and step through it, but whenever I try printing a variable, I get (e.g. for the variable ret):
Code:
No symbol "ret" in current context.

In my program libodbcinst.so loads my own library (an odbc driver). This library I can debug fully, symbols and all.
Things I've verified:
- libodbcinst.so is compiled with debug information. I compiled it myself from UnixODBC sources, and made sure it was compiled with debug info.
- libodcinst.so is not stripped - I ran 'nm' on it, and got a symbol table.
- From gdb I ran 'info share' and saw that libodbcinst.so was in the list of loaded libraries. I also tried running 'sharedlibrary libodbcinst.so' but this made no difference.
- I tried running add-symbol-file for the library. I must admit I have a problem here. This command is supposed to receive an 'address' parameter. The manual says this should be the address where the library was loaded. How do I know that library? I tried putting different things there - for example the address of the text segment I got from 'maint info sections', but not only could I still not see the symbols, this also screwed up something with the rest of the debugging.

So, in addition to a solution to show the symbols, I would also be very grateful for an explanation of the address parameter for add-symbol-file.

I'm working on HP-UX 11.23 (Itanium). Using HP gdb (wdb) 5.7 .

TIA!

RO
 

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gdb-add-index

GDB-ADD-INDEX(1)					       GNU Development Tools						  GDB-ADD-INDEX(1)

NAME

       gdb-add-index - Add index files to speed up GDB

SYNOPSIS

       gdb-add-index filename

DESCRIPTION

       When GDB finds a symbol file, it scans the symbols in the file in order to construct an internal symbol table.  This lets most GDB
       operations work quickly--at the cost of a delay early on.  For large programs, this delay can be quite lengthy, so GDB provides a way to
       build an index, which speeds up startup.

       To determine whether a file contains such an index, use the command readelf -S filename: the index is stored in a section named
       ".gdb_index".  Note that the index is never generated for files that do not contain DWARF debug information (sections named ".debug_*").

       See more in the GDB manual in node "Index Files" -- shell command "info -f gdb -n 'Index Files'".

OPTIONS

SEE ALSO

       The full documentation for GDB is maintained as a Texinfo manual.  If the "info" and "gdb" programs and GDB's Texinfo documentation are
       properly installed at your site, the command

	       info gdb

       should give you access to the complete manual.

       Using GDB: A Guide to the GNU Source-Level Debugger, Richard M. Stallman and Roland H. Pesch, July 1991.

COPYRIGHT

       Copyright (c) 1988-2013 Free Software Foundation, Inc.

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gdb-Red Hat Enterprise Linux 7.6.1-51.el7			    2014-06-10							  GDB-ADD-INDEX(1)
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