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Automake includes support for compiled Java, using gcj, the Java
front end to the GNU Compiler Collection.
Any package including Java code to be compiled must define the output
variable `GCJ' in `configure.in'; the variable `GCJFLAGS'
must also be defined somehow (either in `configure.in' or
`Makefile.am'). The simplest way to do this is to use the
AM_PROG_GCJ macro.
By default, programs including Java source files are linked with
gcj.
As always, the contents of `AM_GCJFLAGS' are passed to every
compilation invoking gcj (in its role as an ahead-of-time
compiler -- when invoking it to create `.class' files,
`AM_JAVACFLAGS' is used instead). If it is necessary to pass
options to gcj from `Makefile.am', this macro, and not the
user macro `GCJFLAGS', should be used.
gcj can be used to compile `.java', `.class',
`.zip', or `.jar' files.