D slower than C++ in compile time

[torhu]

Frank Benoit wrote:
> For the DWT library this would lead to compile times >15 minutes!
> 

I just tried building dwt-win with and without oneatatime enabled. 
Compiler options are '-O -release -inline'.  My PC is a 1.3 GHz athlon, 
with 896 MB RAM and a fairly fast HD.  I could have left out -inline, 
but the time savings likely wouldn't be significant.

Results:
all at once:    2 mins 27 secs, 5.9MB .lib file
one at a time:  39 minutes, 17 MB .lib file

I only did this once, but I expect the results would be about the same 
each time.  This is pretty ugly.

dwt-win is 6.9 MB of code in 353 files, about the same size as Tango.