Re: Mysterious GDB Error!

[Erik Boettcher <tehfoo@gmail.com>]

This is a problem caused by Gentoo stripping symbols from programs
when they are compiled.  You need to re-emerge glibc with stripping
disabled like so:

FEATURES=nostrip emerge glibc


On Fri, 11 Feb 2005 01:28:34 -0600, Hareesh Nagarajan
<hareesh.nagarajan@gmail.com> wrote:
> Hi,
> 
> I've written this simple piece of code that uses STL strings in C++
> (appears below). Now when I run GDB I get the following:
> 
> 1. warning: Unable to find dynamic linker breakpoint function.
> GDB will be unable to debug shared library initializers
> and track explicitly loaded dynamic code.
> 
> 2. The program being debugged stopped while in a function called from GDB.
> When the function (std::string::at(unsigned) const) is done executing,
> GDB will silently stop (instead of continuing to evaluate the
> expression containing the function call).
> 
> Why on earth am I getting the second message? I am not able call the
> member functions of any container.
> 
> My specs:
> Athlon Processor
> 2.6.9-gentoo-r1
> Gentoo 2004.3 (stage3 install)
> GDB was emerged from source.
> 
> How can I set gdb straight? Do I need to re-emerge something.
> 
> Thanks,
> 
> Hareesh
> PS: The code and the GDB output follow.
> 
> <code>
> #include <string>
> #include <iostream>
> using namespace std;
> 
> int main(void)
> {
>         string s("hello");
>         char x;
> 
>         cout << s.at(3);
>         x = s.at(3);
>         return 0;
> }
> </code>
> 
> <gdb>
> 
> hareesh: 1/ $ gdb ./a.out
> GNU gdb 6.0
> Copyright 2003 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i686-pc-linux-gnu"...Using host
> libthread_db library
>  "/lib/libthread_db.so.1".
> 
> (gdb) l
> 1       #include <string>
> 2       #include <iostream>
> 3       using namespace std;
> 4
> 5       int main(void)
> 6       {
> 7               string s("hello");
> 8               char x;
> 9
> 10              cout << s.at(3);
> (gdb) b 9
> Breakpoint 1 at 0x80488a6: file x.cc, line 9.
> (gdb) r
> Starting program: /home/hareesh/courses/485/1/a.out
> warning: Unable to find dynamic linker breakpoint function.
> GDB will be unable to debug shared library initializers
> and track explicitly loaded dynamic code.
> 
> Breakpoint 1, main () at x.cc:10
> 10              cout << s.at(3);
> (gdb) inspect s.at(3)
> 
> Breakpoint 1, main () at x.cc:10
> 10              cout << s.at(3);
> The program being debugged stopped while in a function called from GDB.
> When the function (std::string::at(unsigned) const) is done executing,
> GDB will
> silently stop (instead of continuing to evaluate the expression containing
> the function call).
> 
> </gdb>
> -
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