If I do a full build of the j2se workspace, followed by modifying some files,
the build process attempts to compile the modified files.
Trouble is, the build process tries to do this on *each* subsequent invocation
of make, even if no additional files have changed. All the files I've *ever*
touched are recompiled.

# Java sources to be compiled: (listed in file ../../../build/solaris-sparc/tmp/java/java.lang/java/.classes.list)
../../../src/share/classes/java/util/ResourceBundle.java
../../../src/share/classes/java/util/Collections.java
../../../src/share/classes/java/util/Queue.java
../../../src/share/classes/java/util/EnumSet.java
../../../src/share/classes/java/util/RegularEnumSet.java
../../../src/share/classes/java/util/AbstractQueue.java
../../../src/share/classes/java/util/WeakHashMap.java
# Running javac:
/usr/java1.5.0/bin/javac -J-Xbootclasspath/p:../../../make/sun/javac/javac/gjc.jar -J-client -target 5 -J-Xmx128m -classpath ../../../build/solaris-sparc/classes -bootclasspath ../../../build/solaris-sparc/lib/jce.jar:../../../build/solaris-sparc/lib/jsse.jar -sourcepath ../../../build/solaris-sparc/gensrc:../../../src/solaris/classes:../../../src/share/classes -d ../../../build/solaris-sparc/classes -encoding ascii -source 1.5 @../../../build/solaris-sparc/tmp/java/java.lang/java/.classes.list