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4.18.3 Makefile for building *.jtw into *.java and running *.class files

Here is the GNU Makefile for building *.java files and *.class files and running them. 

.PRECIOUS:
.PRECIOUS: %.java %.class

JAVAC_FLAGS = -source 1.5 -Xlint:unchecked -Xlint:deprecation
JAVA_FLAGS  = -enableassertions
SHELL       = /bin/bash

%.java: %.jtw
        @echo "* Stage 1 : Debugging $*.jtw and building $*.java file"
        emacs --batch --eval "(setq *stump* \"$*\")" --load jtw-build-jtw.el --funcall doit

%.class: %.java
        @echo "* Stage 2 : Debugging *.java and building *.class file(s)"
        javac $(JAVAC_FLAGS) $$(find . -name "*.java") |& emacs --batch --eval "(setq *stump* \"$*\")" --load jtw-javac.el --funcall doit |& grep "input0-9:" - |& sed -e "s/input0-9:s//g" -

%.run: %.class
        @echo "* Stage 3 : Running $*.class File"
        java $(JAVA_FLAGS) $* |& emacs --batch --load jtw-java.el --funcall doit |& grep "input0-9*:" - |& sed -e "s/input0-9*://g" -

build: clean

The first line .PRECIOUS without any arguments clears the list of precious files, the list of files not to delete during the build process.