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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_prog_javah.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_PROG_JAVAH
#
# DESCRIPTION
#
# AX_PROG_JAVAH tests the availability of the javah header generator and
# looks for the jni.h header file. If available, JAVAH is set to the full
# path of javah and CPPFLAGS is updated accordingly.
#
# LICENSE
#
# Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 11
AU_ALIAS([AC_PROG_JAVAH], [AX_PROG_JAVAH])
AC_DEFUN([AX_PROG_JAVAH],[
AC_REQUIRE([AC_CANONICAL_BUILD])dnl
AC_REQUIRE([AC_PROG_CPP])dnl
AC_PATH_PROG(JAVAH,javah)
AS_IF([test -n "$ac_cv_path_JAVAH"],
[
AC_PREPROC_IFELSE([AC_LANG_SOURCE([[#include <jni.h>]])],[],[
ac_save_CPPFLAGS="$CPPFLAGS"
_ACJAVAH_FOLLOW_SYMLINKS("$ac_cv_path_JAVAH")
ax_prog_javah_bin_dir=`AS_DIRNAME([$_ACJAVAH_FOLLOWED])`
ac_dir="`AS_DIRNAME([$ax_prog_javah_bin_dir])`/include"
AS_CASE([$build_os],
[cygwin*|mingw*],
[ac_machdep=win32],
[ac_machdep=`AS_ECHO($build_os) | sed 's,[[-0-9]].*,,'`])
CPPFLAGS="$ac_save_CPPFLAGS -I$ac_dir -I$ac_dir/$ac_machdep"
AC_PREPROC_IFELSE([AC_LANG_SOURCE([[#include <jni.h>]])],
[ac_save_CPPFLAGS="$CPPFLAGS"],
[AC_MSG_WARN([unable to include <jni.h>])])
CPPFLAGS="$ac_save_CPPFLAGS"])
])
])
AC_DEFUN([_ACJAVAH_FOLLOW_SYMLINKS],[
# find the include directory relative to the javac executable
_cur="$1"
while ls -ld "$_cur" 2>/dev/null | grep " -> " >/dev/null; do
AC_MSG_CHECKING([symlink for $_cur])
_slink=`ls -ld "$_cur" | sed 's/.* -> //'`
case "$_slink" in
/*) _cur="$_slink";;
# 'X' avoids triggering unwanted echo options.
*) _cur=`echo "X$_cur" | sed -e 's/^X//' -e 's:[[^/]]*$::'`"$_slink";;
esac
AC_MSG_RESULT([$_cur])
done
_ACJAVAH_FOLLOWED="$_cur"
])
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