# $Id$
## @file
# GNU Make Compatible bootstrap Makefile.
#

#
# Copyright (c) 2007 knut st. osmundsen <bird-kBuild-spam@anduin.net>
#
# This file is part of kBuild.
#
# kBuild 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.
#
# kBuild 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 kBuild; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
#


#
# ASSUMES:
#   - KBUILD_TARGET, KBUILD_HOST, KBUILD_HOST_ARCH, and KBUILD_TYPE in the env.
#   - KBUILD_PATH points to ./kBuild with an absolute path.
#   - KBUILD_BIN_PATH and PATH_KBUILD_BIN must *NOT* be defined anywhere.
#   - Current directory == bootstrap.gmk directory.
#   - mkdir -p works.
#   - ln -s works
#   - cp -f works
#   - cd somedir && command works.
#   - echo done > some-file works.
#   - Recent GNU make that implements CURDIR, $(error) and ifdef.
#
# Tip: kBuild/env.sh --full (g(nu))make -f bootstrap.kmk
#
#

#
# OPTIONAL:
#   Set env.var. NIX_INSTALL_DIR to /usr/local or /usr
#   (see Config.kmk and wiki for details)
#

#
# Deal with legacy env.vars. - no niceties here.
#
ifndef KBUILD_HOST
 KBUILD_HOST := $(BUILD_PLATFORM)
endif
ifndef KBUILD_HOST_ARCH
 KBUILD_HOST_ARCH := $(BUILD_PLATFORM_ARCH)
endif
ifndef KBUILD_HOST_CPU
 KBUILD_HOST_CPU := $(BUILD_PLATFORM_CPU)
endif

ifndef KBUILD_TARGET
 KBUILD_TARGET := $(BUILD_TARGET)
endif
ifndef KBUILD_TARGET_ARCH
 KBUILD_TARGET_ARCH := $(BUILD_TARGET_ARCH)
endif
ifndef KBUILD_TARGET_CPU
 KBUILD_TARGET_CPU := $(BUILD_TARGET_CPU)
endif

ifndef KBUILD_TYPE
 KBUILD_TYPE := $(BUILD_TYPE)
endif

ifndef KBUILD_PATH
 KBUILD_PATH := $(PATH_KBUILD)
endif

#
# Check (some of) the assumptions.
#
ifndef KBUILD_TARGET
 $(error KBUILD_TARGET not set)
endif

ifndef KBUILD_HOST
 $(error KBUILD_HOST not set)
endif

ifndef KBUILD_HOST_ARCH
 $(error KBUILD_HOST_ARCH not set)
endif

ifndef KBUILD_TYPE
 $(error KBUILD_TYPE not set)
endif

ifndef KBUILD_TYPE
 $(error KBUILD_TYPE not set)
endif

ifndef KBUILD_PATH
 $(error KBUILD_PATH not set)
endif

ifdef KBUILD_BIN_PATH
 $(error KBUILD_BIN_PATH is set)
endif
ifdef PATH_KBUILD_BIN
 $(error PATH_KBUILD_BIN is set)
endif


#
# Globals
#
SRCDIR = $(CURDIR)
OUTDIR = $(SRCDIR)/out/$(KBUILD_HOST).$(KBUILD_HOST_ARCH)/$(KBUILD_TYPE)/bootstrap

# Override this on the make commandline if you need to (FreeBSD).
AUTORECONF = autoreconf

all: stage1 stage2


#
# Stage 1 - Build bootstrap kmk, kmk_redirect and sed, refresh config.h caches, link
#           up kmk_ash so $(OUTDIR)/kmk can serve as kBuild bin dir.
#
stage1: \
    $(OUTDIR)/kmk/kmk \
    $(OUTDIR)/kmk/kmk_ash \
    $(OUTDIR)/kmk/kmk_sed \
    $(SRCDIR)/src/kmk/config.h.$(KBUILD_TARGET) \
    $(SRCDIR)/src/sed/config.h.$(KBUILD_TARGET)

# kmk
$(OUTDIR)/kmk/ts-autoreconf:
	mkdir -p $(@D)
	cd $(SRCDIR)/src/kmk && $(AUTORECONF) -i -v
	echo done > $@

$(OUTDIR)/kmk/ts-configured: $(OUTDIR)/kmk/ts-autoreconf
	cd $(OUTDIR)/kmk && $(SRCDIR)/src/kmk/configure
	echo done > $@

$(OUTDIR)/kmk/config.h: $(OUTDIR)/kmk/ts-configured

$(SRCDIR)/src/kmk/config.h.$(KBUILD_TARGET): $(OUTDIR)/kmk/config.h
	cp -f $(OUTDIR)/kmk/config.h $(SRCDIR)/src/kmk/config.h.$(KBUILD_TARGET)

$(OUTDIR)/kmk/kmk: $(OUTDIR)/kmk/ts-configured
	$(MAKE) -C $(@D)

# sed
$(OUTDIR)/sed/ts-autoreconf:
	mkdir -p $(@D)
	@cd $(SRCDIR)/src/sed && $(AUTORECONF) -i -v --force
	echo done > $@

$(OUTDIR)/sed/ts-configured: $(OUTDIR)/sed/ts-autoreconf
	cd $(OUTDIR)/sed && $(SRCDIR)/src/sed/configure --without-libintl --disable-nls
	echo done > $@

$(OUTDIR)/sed/config.h: $(OUTDIR)/sed/ts-configured

$(SRCDIR)/src/sed/config.h.$(KBUILD_TARGET): $(OUTDIR)/sed/config.h
	cp -f $< $@

$(OUTDIR)/sed/sed/sed: $(OUTDIR)/sed/ts-configured
	$(MAKE) -C $(@D)/..

$(OUTDIR)/kmk/kmk_sed: $(OUTDIR)/sed/sed/sed
	cp -f $< $@

$(OUTDIR)/kmk/kmk_ash:
	ln -s /bin/sh $@

#
# Stage 2 - Build kBuild using the bootstrap tools from the previous step
#           and install it to kBuild/bin/x.y.
#
stage2: \
    $(OUTDIR)/ts-stage2-build \
    $(OUTDIR)/ts-stage2-install

$(OUTDIR)/ts-stage2-build: \
		$(SRCDIR)/src/kmk/config.h.$(KBUILD_TARGET) \
                $(SRCDIR)/src/sed/config.h.$(KBUILD_TARGET) \
		$(OUTDIR)/kmk/kmk
	$(OUTDIR)/kmk/kmk -C $(SRCDIR)
	echo done > $@

$(OUTDIR)/ts-stage2-install: $(OUTDIR)/ts-stage2-build
	$(OUTDIR)/kmk/kmk -C $(SRCDIR) PATH_INS=$(SRCDIR) install
	echo done > $@


#
# Clean the output files...
#
clean:
	rm -Rf $(SRCDIR)/out/ \
		$(SRCDIR)/src/kmk/autom4te.cache/ \
		$(SRCDIR)/src/sed/autom4te.cache/
	rm -f $(SRCDIR)/src/kmk/Makefile.in \
		$(SRCDIR)/src/kmk/config.h.in \
		$(SRCDIR)/src/kmk/configure \
		$(SRCDIR)/src/kmk/aclocal.m4 \
		$(SRCDIR)/src/kmk/glob/Makefile.in \
		$(SRCDIR)/src/kmk/config/Makefile.in \
		$(SRCDIR)/src/kmk/config/depcomp \
		$(SRCDIR)/src/kmk/config/compile \
		$(SRCDIR)/src/kmk/config/missing \
		$(SRCDIR)/src/kmk/config/config.guess \
		$(SRCDIR)/src/kmk/config/config.sub \
		$(SRCDIR)/src/kmk/config/install-sh \
		$(SRCDIR)/src/kmk/w32/Makefile.in


# can't hurt...
.NOTPARALLEL: