Automake includes support for natively compiled Java, using
the Java front end to the GNU Compiler Collection (rudimentary support
for compiling Java to bytecode using the
javac compiler is
also present, albeit deprecated; see Java bytecode compilation).
Any package including Java code to be compiled must define the output
GCJ in configure.ac; the variable
must also be defined somehow (either in configure.ac or
Makefile.am). The simplest way to do this is to use the
By default, programs including Java source files are linked with
As always, the contents of
AM_GCJFLAGS are passed to every
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
gcj from Makefile.am, this variable, and not
the user variable
GCJFLAGS, should be used.
gcj can be used to compile .java, .class,
.zip, or .jar files.
gcj requires that the main class be specified
using the --main= option. The easiest way to do this is to use
_LDFLAGS variable for the program.