PATCH: Make Makefile.am work in parallel

[Tom Tromey]

>>>>> "Anthony" == Anthony Green <green@redhat.com> writes:

Anthony> I think this change is unreliable because there's a
Anthony> reasonable chance that the compiler may read a partially
Anthony> written .class file and barf.

I agree.

Anthony> Perhaps if there were some way to tell the compiler to only
Anthony> read .java files -- but that would slow things down a fair
Anthony> bit.

I think if we build all the .class files with a single gcj invocation,
things will speed up.  Of course, that isn't parallelizable :-(.  But
then I think in general this is a flaw of the Java compilation model.

Last time we tried to build all the .class files at once we ran into a
gcj bug.  I haven't looked since, but based on recent Classpath
experience I'd say we will probably need some minor source tweaks to
get it to work.

Tom