[patch] add --with-java-home configure option

[Thomas Fitzsimmons]

Hi,

This patch adds a --with-java-home configure option and sets the
java.home and sun.boot.class.path system properties accordingly.  In the
future, we plan to make libgcj's installation layout more SDK-like for
compatibility reasons -- at that point, we can expand the meaning of
this option.  For now a separate project, java-gcj-compat, can be
installed to provide compatibility symlinks.  The --with-java-home
option will allow us to symlink java directly to gij, where before we
were wrapping gij with a hacky option-massaging shell script.

Tom

2005-04-04  Thomas Fitzsimmons  <fitzsim@redhat.com>

	PR libgcj/20750
	* Makefile.am (AM_CXXFLAGS): Define JAVA_HOME.
	* Makefile.in: Regenerate.
	* configure.ac: Add --with-java-home option.
	* configure: Regenerate.
	* external/Makefile.in: Regenerate.
	* external/sax/Makefile.in: Regenerate.
	* external/w3c_dom/Makefile.in: Regenerate.
	* gcj/Makefile.in: Regenerate.
	* include/Makefile.in: Regenerate.
	* java/lang/natRuntime.cc
	(insertSystemProperties): Set java.home and sun.boot.class.path
	based on JAVA_HOME
	* testsuite/Makefile.in: Regenerate.

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