Installing libgcj consumes huge amounts of memory

[Paolo Bonzini]

> I've been considering working around this problem by just redoing the
> whole .java->.class step whenever any .java file changes.  That would
> probably be slower for libgcj developers but at least wouldn't hugely
> hurt folks working elsewhere.  Also, most class library development
> happens in Classpath these days anyway.

Like Andrew, I would like dependencies between one Java file and all the 
class file in the package.  This would also help on parallelization.

A possibility (which can be applied either if you have a single huge 
.java->.class step, or if you make it more fine grained) is to make all 
class files depend on all sources via an intermediate rule, like

gnu/java/lang/a.class gnu/java/lang/b.class gnu/java/lang/c.class: \
   gnu/java/lang.stamp
	touch $@

gnu/java/lang.stamp: \
   gnu/java/lang/a.java gnu/java/lang/b.java gnu/java/lang/c.java
	$(JAVAC) $?
	echo stamp > $@

Paolo