as for errno, try including errno.h or for c++, cerrno. its a libc thing. not sure about the std::list thing. but have you actually included std::list's header?

Try to compile with -ggdb3 instead. I am not sure you can call templates themselves, since they don't exist, they just turn into compile code (it is not as if you are calling a function).

As for the errno number, just check the code to see which numbers you are passing to the function

As far as I know, size() is inlined, so you can't call it.

(Edited:

#include <list>

int main() {
    std::list<int>i;

    i.push_back(1);
    i.push_back(2);
    i.push_back(3);

    return 0;
}

gives

reybrujo@ansalon:~$ gdb test
GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu"...
(gdb) b main 
Breakpoint 1 at 0x8048607: file test.cc, line 4.
(gdb) r
Starting program: /home/reybrujo/test 

Breakpoint 1, main () at test.cc:4
4	    std::list<int>i;
(gdb) n
6	    i.push_back(1);
(gdb) 
7	    i.push_back(2);
(gdb) p i.size
Cannot take address of method size.
(gdb) p i.size()
Cannot evaluate function -- may be inlined
(gdb) 

I remember having wondered once why I couldn't access template members)

My current gcc version supports -ggdb3, but my gdb version barfs on it.

I did
Couldn't I override the inline, by defining a function pointer? The problem is, I haven't got the foggiest about the signature... Time for the STL refernce.