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+# ===========================================================================
+# http://autoconf-archive.cryp.to/ax_ruby_devel.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_RUBY_DEVEL([version])
+#
+# DESCRIPTION
+#
+# This macro checks for Ruby and tries to get the include path to
+# 'ruby.h'. It provides the $(RUBY_CFLAGS) and $(RUBY_LDFLAGS) output
+# variables. It also exports $(RUBY_EXTRA_LIBS) for embedding Ruby in your
+# code.
+#
+# You can search for some particular version of Ruby by passing a
+# parameter to this macro, for example "1.8.6".
+#
+# LICENSE
+#
+# Copyright (c) 2008 Rafal Rzepecki <divided.mind@gmail.com>
+# Copyright (c) 2008 Sebastian Huber <sebastian-huber@web.de>
+# Copyright (c) 2008 Alan W. Irwin <irwin@beluga.phys.uvic.ca>
+# Copyright (c) 2008 Rafael Laboissiere <rafael@laboissiere.net>
+# Copyright (c) 2008 Andrew Collier <colliera@ukzn.ac.za>
+# Copyright (c) 2008 Matteo Settenvini <matteo@member.fsf.org>
+# Copyright (c) 2008 Horst Knorr <hk_classes@knoda.org>
+#
+# 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 3 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 <http://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.
+AC_DEFUN([AX_RUBY_DEVEL],[
+ AC_REQUIRE([AX_WITH_RUBY])
+ AS_IF([test -n "$1"], [AX_PROG_RUBY_VERSION([$1])])
+
+ #
+ # Check if you have mkmf, else fail
+ #
+ AC_MSG_CHECKING([for the mkmf Ruby package])
+ ac_mkmf_result=`$RUBY -rmkmf -e ";" 2>&1`
+ if test -z "$ac_mkmf_result"; then
+ AC_MSG_RESULT([yes])
+ else
+ AC_MSG_RESULT([no])
+ AC_MSG_WARN([cannot import Ruby module "mkmf".
+Please check your Ruby installation. The error was:
+$ac_distutils_result])
+ fi
+
+ #
+ # Check for Ruby include path
+ #
+ if test -z "$RUBY_CFLAGS"; then
+ #
+ # Check for Ruby cflags
+ #
+ AC_MSG_CHECKING([for Ruby cflags])
+ if test -z "$RUBY_CFLAGS"; then
+ RUBY_CFLAGS=`$RUBY -rmkmf -e 'print RbConfig::CONFIG.fetch(%q(CFLAGS))'`
+ fi
+ AC_MSG_RESULT([$RUBY_CFLAGS])
+
+ #
+ # Check for Ruby include path
+ #
+ AC_MSG_CHECKING([for Ruby include path])
+ ruby_path=`$RUBY -rmkmf -e 'c = RbConfig::CONFIG; print c.has_key?(%q(rubyhdrdir)) ? \
+ c.fetch(%q(rubyhdrdir)) : c.fetch(%q(archdir))'`
+
+ ruby_arch=`$RUBY -rmkmf -e 'print RbConfig::CONFIG.fetch(%q(arch))'`
+
+ if test -n "${ruby_path}"; then
+ #
+ # For some reason ruby 1.9.1 on linux seems to put its
+ # config.h file in ${ruby_path}/${ruby_arch}/ruby/config.h
+ # Aside from the fact that it is WRONG to include your own
+ # config.h file, it means we can't use the headers unless we
+ # add both paths.
+ #
+ if test -d "${ruby_path}/${ruby_arch}"; then
+ ruby_path=" -I${ruby_path} -I${ruby_path}/${ruby_arch}"
+ else
+ ruby_path=" -I${ruby_path}"
+ fi
+ fi
+
+ RUBY_CFLAGS="$RUBY_CFLAGS $ruby_path"
+ AC_MSG_RESULT([$ruby_path])
+ fi
+
+ AC_SUBST([RUBY_CFLAGS])
+
+ if test -z "$RUBY_LDFLAGS"; then
+ #
+ # Check for Ruby library path
+ #
+ AC_MSG_CHECKING([for Ruby library path])
+ if test -z "$RUBY_LIBRARY_PATH"; then
+ RUBY_LIBRARY_PATH=`$RUBY -rmkmf -e 'print RbConfig::CONFIG.fetch(%q(libdir))'`
+ if test -n "${RUBY_LIBRARY_PATH}"; then
+ RUBY_LIBRARY_PATH=" -L$RUBY_LIBRARY_PATH"
+ fi
+ fi
+
+ AC_MSG_RESULT([$RUBY_LIBRARY_PATH])
+
+ #
+ # Check for Ruby linking flags
+ #
+ AC_MSG_CHECKING([for Ruby linking flags])
+
+ RUBY_LDFLAGS=`$RUBY -rmkmf -e 'print RbConfig::CONFIG.fetch(%q(LIBRUBYARG_SHARED))'`
+ AC_MSG_RESULT([$RUBY_LDFLAGS])
+
+ RUBY_LDFLAGS="${RUBY_LIBRARY_PATH} ${RUBY_LDFLAGS}"
+ fi
+
+ AC_SUBST([RUBY_LDFLAGS])
+
+ #
+ # Check for site packages
+ #
+ AC_MSG_CHECKING([for Ruby site-packages path])
+ if test -z "$RUBY_SITE_PKG"; then
+ RUBY_SITE_PKG=`$RUBY -rmkmf -e 'print RbConfig::CONFIG.fetch(%q(sitearchdir))'`
+ fi
+ AC_MSG_RESULT([$RUBY_SITE_PKG])
+ AC_SUBST([RUBY_SITE_PKG])
+
+ #
+ # libraries which must be linked in when embedding
+ #
+ AC_MSG_CHECKING([for Ruby extra libraries])
+ if test -z "$RUBY_EXTRA_LIBS"; then
+ RUBY_EXTRA_LIBS=`$RUBY -rmkmf -e 'print RbConfig::CONFIG.fetch(%q(SOLIBS))'`
+ fi
+ AC_MSG_RESULT([$RUBY_EXTRA_LIBS])
+ AC_SUBST(RUBY_EXTRA_LIBS)
+
+ #
+ # linking flags needed when embedding
+ # (is it even needed for Ruby?)
+ #
+ # AC_MSG_CHECKING([for Ruby extra linking flags])
+ # if test -z "$RUBY_EXTRA_LIBS"; then
+ # RUBY_EXTRA_LIBS=`$RUBY -rmkmf -e 'print RubyConfig::CONFIG.fetch(%q(LINKFORSHARED))'`
+ # fi
+ # AC_MSG_RESULT([$RUBY_EXTRA_LIBS])
+ # AC_SUBST(RUBY_EXTRA_LIBS)
+
+ # this flags breaks ruby.h, and is sometimes defined by KDE m4 macros
+ CFLAGS="`echo "$CFLAGS" | sed -e 's/-std=iso9899:1990//g;'`"
+ #
+ # final check to see if everything compiles alright
+ #
+ AC_MSG_CHECKING([consistency of all components of ruby development environment])
+ AC_LANG_PUSH([C])
+ # save current global flags
+ ac_save_LIBS="$LIBS"
+ LIBS="$ac_save_LIBS $RUBY_LDFLAGS"
+ ac_save_CFLAGS="$CFLAGS"
+ CFLAGS="$ac_save_CFLAGS $RUBY_CFLAGS"
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM([#include <ruby.h>],[ruby_init()])],
+ [rubyexists=yes],
+ [rubyexists=no])
+
+ AC_MSG_RESULT([$rubyexists])
+
+ if test ! "$rubyexists" = "yes"; then
+ AC_MSG_WARN([
+ Could not link test program to Ruby. Maybe the main Ruby library has been
+ installed in some non-standard library path. If so, pass it to configure,
+ via the LDFLAGS environment variable.
+ Example: ./configure LDFLAGS="-L/usr/non-standard-path/ruby/lib"
+ ============================================================================
+ You probably have to install the development version of the Ruby package
+ for your distribution. The exact name of this package varies among them.
+ ============================================================================
+ ])
+ RUBY_VERSION=""
+ fi
+ AC_LANG_POP
+ # turn back to default flags
+ CFLAGS="$ac_save_CFLAGS"
+ LIBS="$ac_save_LIBS"
+
+ #
+ # all done!
+ #
+])
+