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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_check_java_home.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CHECK_JAVA_HOME
#
# DESCRIPTION
#
# Check for Sun Java (JDK / JRE) installation, where the 'java' VM is in.
# If found, set environment variable JAVA_HOME = Java installation home,
# else left JAVA_HOME untouch, which in most case means JAVA_HOME is
# empty.
#
# LICENSE
#
# Copyright (c) 2008 Gleen Salmon <gleensalmon@yahoo.com>
#
# 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 7
AU_ALIAS([AC_CHECK_JAVA_HOME], [AX_CHECK_JAVA_HOME])
AC_DEFUN([AX_CHECK_JAVA_HOME],
[AC_MSG_CHECKING([for JAVA_HOME])
# We used a fake loop so that we can use "break" to exit when the result
# is found.
while true
do
# If the user defined JAVA_HOME, don't touch it.
test "${JAVA_HOME+set}" = set && break
# On Mac OS X 10.5 and following, run /usr/libexec/java_home to get
# the value of JAVA_HOME to use.
# (http://developer.apple.com/library/mac/#qa/qa2001/qa1170.html).
JAVA_HOME=`/usr/libexec/java_home 2>/dev/null`
test x"$JAVA_HOME" != x && break
# See if we can find the java executable, and compute from there.
TRY_JAVA_HOME=`ls -dr /usr/java/* 2> /dev/null | head -n 1`
if test x$TRY_JAVA_HOME != x; then
PATH=$PATH:$TRY_JAVA_HOME/bin
fi
AC_PATH_PROG([JAVA_PATH_NAME], [java])
if test "x$JAVA_PATH_NAME" != x; then
JAVA_HOME=`echo $JAVA_PATH_NAME | sed "s/\(.*\)[[/]]bin[[/]]java.*/\1/"`
break
fi
AC_MSG_NOTICE([Could not compute JAVA_HOME])
break
done
AC_MSG_RESULT([$JAVA_HOME])
])
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