for review: avoid invoking mmake

[Fergus Henderson]

On 12-Feb-1998, Tyson Dowd <trd at stimpy.cs.mu.oz.au> wrote:
> On some Linux boxes (e.g. mine), the invoking "mmake" in the compiler
> directory has a 50 second startup time, due to all the file accesses. 
> This adds about 1.5 hours to the compilation process.
> 
> "mmake" only needs to be invoked to if we want to remove .c files,
> so the startup can be avoided by using more disk space.
> 
> scripts/Mmake.rules:
> 	If RM_C is set to ':' (that is, removal of .c files is turned
> 	off), we don't need to re-invoke "mmake" on each .c file,
> 	because we don't need to remove the intermediate .c files.
> 	We can also generate .pic_o files directly from .c files.

That looks fine; I suggest you commit it so that we can test it.

-- 
Fergus Henderson <fjh at cs.mu.oz.au>   |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>   |  of excellence is a lethal habit"
PGP: finger fjh at 128.250.37.3         |     -- the last words of T. S. Garp.