mixin file very large

[Amex]

It seems that a single debug mixin file is created per project. 
Is it possible to split this up in to one mixin per file(the file 
it corresponds to?)

Also, recently I've been getting these warnings, never occurred 
before and I don't know why

privatephobos.lib(package.obj) : warning LNK4255: library contain 
multiple objects of the same name; linking object as if no debug 
info
privatephobos.lib(gc.obj) : warning LNK4255: library contain 
multiple objects of the same name; linking object as if no debug 
info
privatephobos.lib(stdio.obj) : warning LNK4255: library contain 
multiple objects of the same name; linking object as if no debug 
info
privatephobos.lib(exception.obj) : warning LNK4255: library 
contain multiple objects of the same name; linking object as if 
no debug info

Any ideas?