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automake-1.16: Java

 
 10.4 Java bytecode compilation (deprecated)
 ===========================================
 
 Automake provides some minimal support for Java bytecode compilation
 with the ‘JAVA’ primary (in addition to the support for compiling Java
 to native machine code; ⇒Java Support with gcj).  Note however
 that _the interface and most features described here are deprecated_.
 Future Automake releases will strive to provide a better and cleaner
 interface, which however _won’t be backward-compatible_; the present
 interface will probably be removed altogether some time after the
 introduction of the new interface (if that ever materializes).  In any
 case, the current ‘JAVA’ primary features are frozen and will no longer
 be developed, not even to take bug fixes.
 
    Any ‘.java’ files listed in a ‘_JAVA’ variable will be compiled with
 ‘JAVAC’ at build time.  By default, ‘.java’ files are not included in
 the distribution; you should use the ‘dist_’ prefix to distribute them.
 
    Here is a typical setup for distributing ‘.java’ files and installing
 the ‘.class’ files resulting from their compilation.
 
      javadir = $(datadir)/java
      dist_java_JAVA = a.java b.java ...
 
    Currently Automake enforces the restriction that only one ‘_JAVA’
 primary can be used in a given ‘Makefile.am’.  The reason for this
 restriction is that, in general, it isn’t possible to know which
 ‘.class’ files were generated from which ‘.java’ files, so it would be
 impossible to know which files to install where.  For instance, a
 ‘.java’ file can define multiple classes; the resulting ‘.class’ file
 names cannot be predicted without parsing the ‘.java’ file.
 
    There are a few variables that are used when compiling Java sources:
 
 ‘JAVAC’
      The name of the Java compiler.  This defaults to ‘javac’.
 
 ‘JAVACFLAGS’
      The flags to pass to the compiler.  This is considered to be a user
      variable (⇒User Variables).
 
 ‘AM_JAVACFLAGS’
      More flags to pass to the Java compiler.  This, and not
      ‘JAVACFLAGS’, should be used when it is necessary to put Java
      compiler flags into ‘Makefile.am’.
 
 ‘JAVAROOT’
      The value of this variable is passed to the ‘-d’ option to ‘javac’.
      It defaults to ‘$(top_builddir)’.
 
 ‘CLASSPATH_ENV’
      This variable is a shell expression that is used to set the
      ‘CLASSPATH’ environment variable on the ‘javac’ command line.  (In
      the future we will probably handle class path setting differently.)
 

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