Standard scheme for maintainer-only debugging code?

[Nathanael Nerode]

Geert said:
>For debugging code, I'd like to propose using a single header
>file that has simple boolean constants of the form debug_XYZ.
>Then use "if (debug_XYZ) do_this;" code for these cases.
>A maintainer who wants to enable the debugging code can do so by
>changing the constant to true, or by making it a variable so
>debugging can be enabled/disabled from a debugger.

Youre idea is better than mine.  :-)

Let's push forward on this.  What should the header be called?
maintainer_debug_flags.h?

It should clearly be included via something which everyone includes, 
like system.h or config.h.