A case for -H header files, avoid repeating expensive compile-time calculations

[cy via Digitalmars-d]

I made a module that looped for a while in compile time (since 
you can't sleep during compile time), to see if I could 
pre-compile the module, and thus save time compiling the main 
application. It didn't work at first, because any file that 
depended on the module would import it, and importing it would 
execute the compile time code again, thus taking a long time to 
compile... twice.

But then I remembered about the rarely used -H option for dmd. -H 
outputs a stripped down version of the source file being 
compiled, with all the function definitions replaced with 
declarations. So if your expensive to compile code is 
encapsulated within a function... it doesn't appear in the -H 
output.

So uh... git://critter.cloudns.org/test-dlang-encapsulation I 
guess. It might be a neat trick to speed up compilation, if you 
have a lot of complicated code that can be hidden behind a simple 
interface.