Re: GDB 5.2 vs. Ada (and probably other unknown languages)

[Andrew Cagney <ac131313 at cygnus dot com>]

> It seems that GDB (starting with 5.1.1 or so) can no longer debug
> programs written in languages unknown to it.  With previous GDB
> versions, you could at least set breakpoints, get backtraces, and
> examine most variables, although you had to take name mangling into
> account.
> 
> For example, if I try to set a breakpoint in an Ada program, I just
> get the error message "internal error - unimplemented function
> unk_lang_create_fundamental_type called."
> 
> Is there a workaround?  Even if full Ada support is not available,
> getting backtraces would be helpful in some cases.

Definitly sounds like a new (and unknown) regression :-(
Can you create a bug report to track this 
(http://sources.redhat.com/gdb/bugs/).  For a workaround, what happens 
if you enter ``set language c''?

There is also a source code dropping of ACT's Ada support in: 
ftp://sources.redhat.com/pub/gdb/contrib/gnat/ you may find the relevant 
change in there.

Andrew

PS: If you're interested in integrating some of the Ada stuff then 
you'll probably also need to get copyright (to the fsf) assignment in place.

> Here's a small, stand-alone test program (you have to compile it using
> "gcc -S -g no_debug.adb && gcc no_debug.s", as it doesn't use the Ada
> run-time library).
> 
> package No_Debug is
> 
>    procedure Main;
>    pragma Export (C, Main, "main");
> 
> end No_Debug;
> 
> with System; use System;
> 
> package body No_Debug is
> 
>    procedure Puts (Str : Address);
>    pragma Import (C, Puts, "puts");
> 
>    Message : constant String := "Hello, world!" & ASCII.NUL;
> 
>    procedure Main is
>    begin
>       Puts (Message'Address);
>    end Main;
> 
> end No_Debug;
> 
> I've attached the x86 assembler code below, in case you want to
> experiment yourself without having to install Ada.
> 
> 
>