Re: -ggdb3 -gdwarf-4 but "info macro BLAH" still doesn't work?

[Luke <hazelnusse@gmail.com>]

I'm having the same problem.

Here is a very simple test C program:

#include <stdio.h>
#define M 42
#define ADD(x) (M + x)
int main ()
{
  printf("%d\n", M);
  printf("%d\n", ADD(2));
  return 0;
}

I compile with:

$ gcc -gdwarf-4 -gdb3 -Wall -O0 sample.c -o sample

then debug:

$ gdb -q ./sample
Reading symbols from /tmp/sample...done.
(gdb) b main
Breakpoint 1 at 0x400560: file sample.c, line 6.
(gdb) run
Starting program: /tmp/sample
Breakpoint 1, main () at sample.c:6
6	      printf("%d\n", M);
(gdb) macro list
(gdb) info source
Current source file is sample.c
Compilation directory is /tmp
Located in /tmp/sample.c
Contains 27 lines.
Source language is c.
Compiled with DWARF 2 debugging format.
Does not include preprocessor macro info.
(gdb) macro expand ADD(1)
expands to: ADD(1)
(gdb) print M
No symbol "M" in current context.

I have tried -g3, -gstabs, -gstabs+ and all have the same problem.

This happens with Linaro gcc 4.7-2012.04, as well as a very recent
pull from gcc master (4.8.0 20120502).

It doesn't happen with gcc 4.6.2.

Hopefully somebody is aware of this and knows what to do.

Any suggestions?  I'm guessing this is a gcc bug.  I'll search there
and if it isn't already reported, I will reported it.

~Luke