Expansing macro-definitions using Gdb

Expansing macro-definitions using Gdb

[Pierre Habraken]

The Gcc man page tells that using the option -g3 macro-definitions
present in the source program are included into the object file.
However, even when I use this option at compile time, Gdb 5.2 does not
recognize such macro-definitions.
Actually, using gcc 3.04, I compiled a C program including macro
definitions first with option -g and then with option -g3. Then, when
using cmp to compare both executables no difference is detected.
Is there a way to enable printing/displaying macro-definitions when
debugging a C program with Gdb ?

Pierre
-- 
________________________________________________________________________
Pierre HABRAKEN - mailto:Pierre.Habraken@imag.fr
Tél: 04 76 82 72 83 - Fax: 04 76 82 72 87
IMAG-LSR BP72 38402 SAINT MARTIN D'HERES Cedex
________________________________________________________________________

Re: Expansing macro-definitions using Gdb

[Daniel Jacobowitz]

On Sat, Jul 06, 2002 at 05:04:29PM +0200, Pierre Habraken wrote:
> The Gcc man page tells that using the option -g3 macro-definitions
> present in the source program are included into the object file.
> However, even when I use this option at compile time, Gdb 5.2 does not
> recognize such macro-definitions.
> Actually, using gcc 3.04, I compiled a C program including macro
> definitions first with option -g and then with option -g3. Then, when
> using cmp to compare both executables no difference is detected.
> Is there a way to enable printing/displaying macro-definitions when
> debugging a C program with Gdb ?

You need to use a CVS snapshot of GDB, and you need to use a very
current GCC; I believe 3.1 will do but you need to verify that
yourself.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

Re: Expansing macro-definitions using Gdb

[Pierre Habraken]

Daniel Jacobowitz wrote:
> 
> You need to use a CVS snapshot of GDB, and you need to use a very
> current GCC; I believe 3.1 will do but you need to verify that
> yourself.
> 

Jim Blandy wrote:
> 
> Macro support was added after 5.2.  To get preprocessor macro support,
> you'll need to get the latest GDB sources.
> 
> For the compiler, you'll need to use Dwarf 2 debugging information.
> Try -gdwarf-2 -g3.

Thanks to you Daniel and Jim, I'll try using the latest Gdb snapshot
together with turning on Dwarf 2 debugging.

Best regards,

Pierre
-- 
________________________________________________________________________
Pierre HABRAKEN - mailto:Pierre.Habraken@imag.fr
Tél: 04 76 82 72 83 - Fax: 04 76 82 72 87
IMAG-LSR BP72 38402 SAINT MARTIN D'HERES Cedex
________________________________________________________________________

Re: Expansing macro-definitions using Gdb

[Jim Blandy]

Pierre Habraken <Pierre.Habraken@imag.fr> writes:
> The Gcc man page tells that using the option -g3 macro-definitions
> present in the source program are included into the object file.
> However, even when I use this option at compile time, Gdb 5.2 does not
> recognize such macro-definitions.
> Actually, using gcc 3.04, I compiled a C program including macro
> definitions first with option -g and then with option -g3. Then, when
> using cmp to compare both executables no difference is detected.
> Is there a way to enable printing/displaying macro-definitions when
> debugging a C program with Gdb ?

Macro support was added after 5.2.  To get preprocessor macro support,
you'll need to get the latest GDB sources.

For the compiler, you'll need to use Dwarf 2 debugging information.
Try -gdwarf-2 -g3.