configure

#!/bin/sh
#
# libslack - https://libslack.org
#
# Copyright (C) 1999-2004, 2010, 2020-2023 raf <raf@raf.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 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/>.
#
# 20230824 raf <raf@raf.org>
#

# Handle --default (for distribution)

case "$1" in
	--default|default)
		set -- --platform=Linux --prefix=default --destdir= --disable-test-rwlock --enable-mail-test
		CC=
		;;
esac

die() { echo "$0: $@" >&2; exit 1; }

PLATFORM=

for opt in "$@"
do
	case "$opt" in
		--help|-h)
			echo "$0 [options]"
			echo "options:"
			echo "  --help                - Print this message then exit"
			echo "  --prefix=/path        - Override platform-specific installation prefix"
			echo "  --destdir=/path       - Override DESTDIR in Makefile for building packages"
			echo "  --enable-test-rwlock  - Enable backup rwlock implementation"
			echo "  --disable-test-rwlock - Disable backup rwlock implementation (default)"
			echo "  --enable-mail-test    - Enable sending an email during tests (default)"
			echo "  --disable-mail-test   - Disable sending an email during tests"
			echo "  --enable-test         - Include backup implementations of some functions (don't)"
			echo "  --default             - Restore Makefile (et al.) to default state (for distribution)"
			echo "  --platform=platform   - Override platform (one of the below) for --default"
			echo
			echo "This configure script knows what to do for several platforms:"
			echo
			echo "  Linux, macOS, FreeBSD, OpenBSD, NetBSD, GNU/kFreeBSD, GNU/Hurd, Solaris"
			echo ""
			echo "To override a platform-specific install prefix, use --prefix (e.g. /opt/local)."
			echo "Note: For --prefix=default and --prefix=/usr, /etc and /var/run are still used."
			echo "For other values, these paths are affected by the prefix."
			echo ""
			echo "To override the makefile \$(DESTDIR), use --destdir."
			echo "This is for building packages and doesn't affect paths in the final binary."
			echo ""
			echo "When creating packages, use --disable-mail-test to suppress an internal"
			echo "test that sends an email message."
			echo ""
			echo "To undo the effects of --disable-mail-test, use --enable-mail-test."
			echo ""			
			echo "If set here, \$CC will override the compiler in the Makefile."
			echo ""
			echo "\$CPPFLAGS, \$CFLAGS and \$LDFLAGS additions need to be supplied to make later."
			echo ""
			exit 0
			;;

		--platform=*)
			PLATFORM="${opt#--platform=}"
			case "$PLATFORM" in
				Linux*|GNU/kFreeBSD*|GNU*|FreeBSD*|NetBSD*|OpenBSD*|SunOS*|Solaris|Darwin*|macOS)
					;;
				*)
					die "Unknown platform: $PLATFORM\nMust be one of: Linux, macOS, FreeBSD, OpenBSD, NetBSD, GNU/kFreeBSD, GNU/Hurd, Solaris"
					;;
			esac
			;;
	esac
done

case "${PLATFORM:-`uname -a`}" in
	Linux*)
		echo "Configuring for linux"
		conf/linux
		if [ -f /etc/slackware-version ]
		then
			echo "Configuring for slackware"
			conf/slackware
		fi
		;;

	GNU/kFreeBSD*)
		echo "Configuring for kfreebsd"
		conf/kfreebsd
		;;

	GNU*)
		echo "Configuring for hurd"
		conf/gnuhurd
		;;

	FreeBSD*)
		echo "Configuring for freebsd"
		conf/freebsd
		;;

	NetBSD*)
		echo "Configuring for netbsd"
		conf/netbsd
		;;

	OpenBSD*)
		echo "Configuring for openbsd"
		conf/openbsd
		;;

	SunOS*|Solaris)
		cc=""
		solaris="solaris10"
		[ "x`uname -r`" = "x5.8" ] && solaris="solaris8"
		[ "x`uname -r`" = "x5.6" ] && solaris="solaris6"
		if [ "`uname -m`" = sun4u ]
		then
			[ "x`which gcc 2>&-`" != "x" ] && cc="gcc"
			[ "x`which cc 2>&-`"  != "x" ] && cc="cc"
		else
			[ "x`which cc 2>&-`"  != "x" ] && cc="cc"
			[ "x`which gcc 2>&-`" != "x" ] && cc="gcc"
		fi
		[ "$cc" = "" ] && die "Failed to find a compiler"
		echo "Configuring for $solaris (with $cc)"
		conf/$solaris-$cc
		;;

	Darwin*|macOS)
		echo "Configuring for macos"
		conf/macosx
		;;

	*)
		die "Unknown platform: Please configure manually"
		;;
esac

# Set CC from $CC (for macports)

if [ "x$CC" != x ]
then
	echo "Configuring CC as $CC"
	conf/ccenv
fi

# Process command line options

for opt in "$@"
do
	case "$opt" in
		--platform=*)
			;;
		--prefix=*)
			echo "Configuring $opt"
			conf/prefix "$opt"
			;;
		--destdir=*)
			echo "Configuring $opt"
			conf/destdir "$opt"
			;;
		--enable-test)
			echo "Configuring to include backup function implementations."
			conf/test
			;;
		--enable-test-rwlock)
			echo "Configuring to include backup rwlock implementation."
			conf/test-rwlock-start
			;;
		--disable-test-rwlock)
			echo "Configuring to exclude backup rwlock implementation (default)."
			conf/test-rwlock-stop
			;;
		--enable-mail-test)
			echo "Configuring to include mail tests (default)."
			conf/mail-test-start
			;;
		--disable-mail-test)
			echo "Configuring to exclude mail tests."
			conf/mail-test-stop
			;;
		*)
			echo "$0: Unknown argument: $opt" >&2
			exit 1
			;;
	esac
done

# Prepare for parallel make

if [ x"`which gmake 2>&-`" != x"" ]
then
	gmake ready
else
	make ready
fi

exit 0

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