Any takers for http://d.puremagic.com/issues/show_bug.cgi?id=9673?

[jerro]

> The better option would be to pass all source files to update 
> in one invocation of dmd, so it won't get slower than a full 
> rebuild, but this has been plagued with linker errors in the 
> past (undefined and duplicate symbols). If it works, it could 
> identify independent group of files which you now separate into 
> libraries.

Aside from linker errors, there is one more (minor) issue with 
this approach. If there are multiple source files with the same 
name and there is no -of flag, DMD will generate an object file 
for just one of them. This could be worked around in rdmd by 
symlinking or copying files, but I think it would be better to 
fix it in DMD and use module.name.o instead of source_file_name.o 
for object file names.