Compile out code for release build in D

Question

Is there any mechanism in D (D2) to force code to be compiled out during a release build?

In C, you might have something like

#ifndef NDEBUG
/*Something that will only run in a debug build*/
#endif

I know that D has

debug(mymodule) {
   //Do something
}

But this requires the user to pass -debug for each module to enable it.

I'm looking for a global mechanism that will always run the code in a normal build but compile it out when you pass the -release flag. I know some built-ins have this ability (e.g. assert), but is there any way for user code to do it too?

Answer 1

If no better answer is found, a hackaround like this should work: bool debugMode() { bool res; assert(!!(res = true)); return res; }

Answer 2

dmd -release -version=dist module.d

and

version(dist) {} else {
    int i = 9;
}

Best I can think of.

[update]

Personally, I think the above answer is "bad". The above solution would introduce overly complex logic into the release process, which I think should be straight forward and predictable. I'd recommend just using -debug and debug{ //... }. Even if you feel you might forget adding the debug-flag when you're compiling—you're just devving!—mistakes are cheap. Mistakes that make it into the release are worse.

Answer 3

There is a global notion of debug. Just write:

debug { ... code ... }