C Macro information and -g3

C Macro information and -g3

[H. Nanosecond]

Hello,

I have gcc 2.8.1 and would like to know if the new version
supports -g3. See below, thanks.


I have a main.c that says

#define XXX "123"

#include <stdio.h>

int main()
{
        puts(XXX);
        return 0;
}

but gcc -g3 main.c
and gcc -g2 main.c 
give identical files.

Same result with -ggdb2 compared with -ggdb3



The info file says:

`-gLEVEL'
`-ggdbLEVEL'
`-gstabsLEVEL'
`-gcoffLEVEL'
`-gxcoffLEVEL'
`-gdwarfLEVEL'
`-gdwarf-2LEVEL'
     Request debugging information and also use LEVEL to specify how
     much information.  The default level is 2.

     Level 1 produces minimal information, enough for making backtraces
     in parts of the program that you don't plan to debug.  This
     includes descriptions of functions and external variables, but no
     information about local variables and no line numbers.

     Level 3 includes extra information, such as all the macro
     definitions present in the program.  Some debuggers support macro
     expansion when you use `-g3'.

Re: C Macro information and -g3

[Martin v. Loewis]

> I have gcc 2.8.1 and would like to know if the new version
> supports -g3. See below, thanks.

It does, as indicated in the documentation.

>      Level 3 includes extra information, such as all the macro
>      definitions present in the program.  Some debuggers support macro
>      expansion when you use `-g3'.

Not all debugging formats support this extra information. In
particular, gdb debugging (i.e. stabs) does not support that. You
could try to use -gdwarf, which does support macro recording.

Regards,
Martin