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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_prog_java.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_PROG_JAVA
#
# DESCRIPTION
#
# Here is a summary of the main macros:
#
# AX_PROG_JAVAC: finds a Java compiler.
#
# AX_PROG_JAVA: finds a Java virtual machine.
#
# AX_CHECK_CLASS: finds if we have the given class (beware of CLASSPATH!).
#
# AX_CHECK_RQRD_CLASS: finds if we have the given class and stops
# otherwise.
#
# AX_TRY_COMPILE_JAVA: attempt to compile user given source.
#
# AX_TRY_RUN_JAVA: attempt to compile and run user given source.
#
# AX_JAVA_OPTIONS: adds Java configure options.
#
# AX_PROG_JAVA tests an existing Java virtual machine. It uses the
# environment variable JAVA then tests in sequence various common Java
# virtual machines. For political reasons, it starts with the free ones.
# You *must* call [AX_PROG_JAVAC] before.
#
# If you want to force a specific VM:
#
# - at the configure.in level, set JAVA=yourvm before calling AX_PROG_JAVA
#
# (but after AC_INIT)
#
# - at the configure level, setenv JAVA
#
# You can use the JAVA variable in your Makefile.in, with @JAVA@.
#
# *Warning*: its success or failure can depend on a proper setting of the
# CLASSPATH env. variable.
#
# TODO: allow to exclude virtual machines (rationale: most Java programs
# cannot run with some VM like kaffe).
#
# Note: This is part of the set of autoconf M4 macros for Java programs.
# It is VERY IMPORTANT that you download the whole set, some macros depend
# on other. Unfortunately, the autoconf archive does not support the
# concept of set of macros, so I had to break it for submission.
#
# A Web page, with a link to the latest CVS snapshot is at
# <http://www.internatif.org/bortzmeyer/autoconf-Java/>.
#
# This is a sample configure.in Process this file with autoconf to produce
# a configure script.
#
# AC_INIT(UnTag.java)
#
# dnl Checks for programs.
# AC_CHECK_CLASSPATH
# AX_PROG_JAVAC
# AX_PROG_JAVA
#
# dnl Checks for classes
# AX_CHECK_RQRD_CLASS(org.xml.sax.Parser)
# AX_CHECK_RQRD_CLASS(com.jclark.xml.sax.Driver)
#
# AC_OUTPUT(Makefile)
#
# LICENSE
#
# Copyright (c) 2008 Stephane Bortzmeyer <bortzmeyer@pasteur.fr>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <https://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 10
AU_ALIAS([AC_PROG_JAVA], [AX_PROG_JAVA])
AC_DEFUN([AX_PROG_JAVA],[
m4_define([m4_ax_prog_java_list], [kaffe java])dnl
AS_IF([test "x$JAVAPREFIX" = x],
[test x$JAVA = x && AC_CHECK_PROGS([JAVA], [m4_ax_prog_java_list])],
[test x$JAVA = x && AC_CHECK_PROGS([JAVA], [m4_ax_prog_java_list], [], [$JAVAPREFIX/bin])])
test x$JAVA = x && AC_MSG_ERROR([no acceptable Java virtual machine found in \$PATH])
m4_undefine([m4_ax_prog_java_list])dnl
AX_PROG_JAVA_WORKS
AC_PROVIDE([$0])dnl
])
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