# Makefile for OpenWRT for cross-compiling GForth
#
# Copyright (C) 1995,1996,1997,1998,2000,2003,2006,2007,2008,2009 Free
# Software Foundation, Inc.
#
# Copyright (C) 2010 David Kühling.  License: GPLv3+

## Note for tuning: In theory you could strip down the resulting packages size
## a lot, if you removed gforth and gforth-fast executables and only included
## the (somewhat slower) gforth-itc and/or gforth-ditc interpreter binary that
## rely on classic indirect threaded code without the (code-bloating) engine
## optimizations.
##
## Also we could create multiple packages here 'gforth-minimal' and 'gforth'?

include $(TOPDIR)/rules.mk

PKG_NAME:=gforth
PKG_SNAPSHOT_DATE=20100918
PKG_VERSION=0.7.0-$(PKG_SNAPSHOT_DATE)
PKG_RELEASE:=5

PKG_BUILD_DEPENDS:= gforth/host libltdl libffi
PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
PKG_FIXUP:=libtool

PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
PKG_SOURCE_URL:=\
	http://user.cs.tu-berlin.de/~dvdkhlng/ \
	http://mosquito.dyndns.tv/~spock/
#PKG_SOURCE_URL:= file://~/forth/gforth/
PKG_MD5SUM:=5ada9cc3f72fea8ea002bbae4b39d118

# Alternate download #1 via CVS: this doesn't work, as CVS is missing the
# kernel.fi images needed for boot-strapping :(
# PKG_SOURCE_PROTO:=cvs
# PKG_SOURCE_VERSION="-D$(PKG_SNAPSHOT_DATE) 23:59"
# PKG_SOURCE_URL=:pserver:anonymous@c1.complang.tuwien.ac.at:/nfs/unsafe/cvs-repository/src-master
# PKG_SOURCE_SUBDIR:=gforth
# PKG_SOURCE:=gforth-$(PKG_SNAPSHOT_DATE).tar.gz

include $(INCLUDE_DIR)/host-build.mk
include $(INCLUDE_DIR)/package.mk

define Package/gforth
  SECTION:=lang
  CATEGORY:=Languages
  TITLE:=GForth
  DEPENDS:= +libltdl +libffi
  URL:=http://www.gnu.org/software/gforth/
endef

define Package/gforth/description
  Gforth is a fast and portable implementation of the ANS Forth
  language.
endef

## The host-GForth uses -ltdl to link against the staging dir version of
## libltdl.  However, when the host-GForth runs, it won't find that library,
## as no library path is encoded into the ltdl dependency (why?).  So here we
## override LD_LIBRARY_PATH for all the build steps that might run the
## host-GForth.
HOST_CONFIGURE_VARS += LTDL_LIBRARY_PATH=$(STAGING_DIR_HOST)/lib \
	no_dynamic_default=1 \
	LD_LIBRARY_PATH=$(STAGING_DIR_HOST)/lib

## Engine's dispatch would be crippled when compiling with -Os, also dynamic
## superinstructions don't seem to work in that case
EXTRA_CFLAGS += -O2

define Host/Configure
	$(call Host/Configure/Default)
endef

## On the host, we only compile and install minimum number of gforth
## components
define Host/Compile
	export LD_LIBRARY_PATH=$(STAGING_DIR_HOST)/lib; \
	$(call Host/Compile/Default, gforth gforth.fi)
endef

define Host/Install
	export LD_LIBRARY_PATH=$(STAGING_DIR_HOST)/lib; \
	$(INSTALL_DIR) $(STAGING_DIR_HOST)/bin
	$(INSTALL_DIR) $(STAGING_DIR_HOST)/lib
	$(INSTALL_BIN) $(HOST_BUILD_DIR)/gforth $(STAGING_DIR_HOST)/bin/
	$(INSTALL_DATA) $(HOST_BUILD_DIR)/gforth.fi $(STAGING_DIR_HOST)/lib/
endef

## Configuration of the target gforth (see also gforth-update-image.in!)
FORTHSIZES=--dictionary-size=1M \
	--data-stack-size=16k \
	--fp-stack-size=16k \
	--return-stack-size=16k \
	--locals-stack-size=16k

CONFIGURE_VARS += FORTHSIZES="$(FORTHSIZES)"
PKG_BUILD_LIBCC_DIR = $(PKG_BUILD_DIR)/lib/gforth/$(PKG_VERSION)/libcc-named/
CROSS_PREFORTH = $(PKG_BUILD_DIR)/preforth
LIBCC_BUILD_SRC = cstr.fs unix/socket.fs
MAKE_VARS += libccdir=$(GFORTH_LIBCC_DIR)

## Here we call configure, then patch the cross-GForth source tree to replace
## the 'preforth' script with a script that calls our host-compiled GForth.
## We also extract the name of the GForth kernel image used for the target
## architecture, and the source files used by GForth for implementing the
## assembler/disassembler for the target architecture.
define Build/Configure
	$(call Build/Configure/Default,)
	cp ./files/gforth-update-image.in ./files/gforth-wrapper.in \
		$(PKG_BUILD_DIR)/
	cd $(PKG_BUILD_DIR) && ./config.status --file gforth-update-image \
		&& ./config.status --file gforth-wrapper
	echo "#!/bin/sh" > $(CROSS_PREFORTH).in
	echo "export LD_LIBRARY_PATH=$(STAGING_DIR_HOST)/lib;" >> $(CROSS_PREFORTH).in
	echo '$(STAGING_DIR_HOST)/bin/gforth -i $(STAGING_DIR_HOST)/lib/gforth.fi "$$$$@"' >> $(CROSS_PREFORTH).in
	chmod a+x $(PKG_BUILD_DIR)/preforth.in
	cp $(CROSS_PREFORTH).in $(CROSS_PREFORTH)
endef

## Forth code snippet used for pre-compiling Gforth's libcc based C-interface
## wrappers on the host, so they can be used on the target. Use $(call) to
## substitute $(1) with a list of Gforth's interface definition files (such as
## 'cstr.fs' etc).
define GforthLibccCompile 
   s" $(PKG_BUILD_LIBCC_DIR)" libcc-named-dir-v 2! \
   libcc-path clear-path \
   libcc-named-dir libcc-path also-path \
   :noname 2drop s" $(GFORTH_LIBCC_DIR)" ; is replace-rpath \
   : end-c-library  try end-c-library endtry-iferror then ; \
   $(1:%=include $(PKG_BUILD_DIR)/%) \
   bye
endef

## Compilation is pretty manual to only build the parts we need.  By default
## the GForth Makefile attempts to auto-tune by recursively calling itself for
## compilation, then running the GForth binary through unit-tests.  This won't
## work with a cross-compile environment.
##
## Todo: we currently always build the -ll-reg version of the engine.  On
## 64-bit architectures this might not work?  Damn it, why is the check for
## 'long long' in the Gforth Makefile, not the configure script?
## Todo: develop a clean upstream patch to configure/Makefile
define Build/Compile
	$(call Build/Compile/Default,kernel/version.fs gforth-ditc \
		engine/prim-fast.i engine/prim_lab-fast.i engine/prim_names-fast.i \
		engine/prim_superend-fast.i engine/profile-fast.i \
		engine/prim_num-fast.i engine/prim_grp-fast.i \
		engine/costs-fast.i engine/super2-fast.i)
	$(call Build/Compile/Default, -C $(PKG_BUILD_DIR)/engine \
		gforth-fast-ll-reg gforth-ll-reg \
		OPT=-ll-reg OPTDEFINES="-DFORCE_LL -DFORCE_REG" OPTOBJECTS=)

	cp $(PKG_BUILD_DIR)/engine/gforth-ll-reg \
		$(PKG_BUILD_DIR)/gforth
	cp $(PKG_BUILD_DIR)/engine/gforth-fast-ll-reg \
		$(PKG_BUILD_DIR)/gforth-fast

	rm -rf $(PKG_BUILD_DIR)/lib/gforth/$(PKG_VERSION)/libcc-named/
	export includedir=$(PKG_BUILD_DIR)/include; \
	$(PKG_BUILD_DIR)/preforth $(PKG_BUILD_DIR)/envos.fs \
		$(PKG_BUILD_DIR)/libcc.fs \
		 -e '$(call GforthLibccCompile,$(LIBCC_BUILD_SRC))'
endef

##
## define lists of GForth's sources to package for loading in the target system
##

GFORTH_FI_SRC = \
	assert.fs \
	backtrac.fs \
	blocked.fb \
	blocks.fs \
	bufio.fs \
	code.fs \
	debug.fs \
	debugs.fs \
	dis-gdb.fs \
	ekey.fs \
	envos.fs \
	savesys.fs \
	environ.fs \
	errors.fs \
	exboot.fs \
	except.fs \
	extend.fs \
	float.fs \
	glocals.fs \
	hash.fs \
	history.fs \
	intcomp.fs \
	mkdir.fs \
	libcc.fs \
	locals.fs \
	look.fs \
	mkdir.fs \
	prelude.fs \
	quotes.fs \
	search.fs \
	see.fs \
	see-ext.fs \
	simp-see.fs \
	source.fs \
	startup.fs \
	struct.fs \
	struct0x.fs \
	stuff.fs \
	tasker.fs \
	termsize.fs \
	utf-8.fs \
	vt100.fs \
	vt100key.fs \
	wordinfo.fs \
	arch/386/asm.fs arch/386/disasm.fs \
	arch/amd64/asm.fs arch/amd64/disasm.fs \
	arch/alpha/asm.fs arch/alpha/disasm.fs arch/alpha/testasm.fs\
	arch/arm/asm.fs arch/arm/disasm.fs \
	arch/arm/testdisasm.fs arch/arm/testdisasm.out arch/arm/Makefile \
	arch/mips/asm.fs arch/mips/disasm.fs arch/mips/insts.fs \
	arch/mips/testasm.fs arch/mips/testdisasm.fs \
	arch/power/asm.fs arch/power/disasm.fs arch/power/inst.fs

LIBCC_SRC = cstr.fs unix/socket.fs
LIBCC_DIST_SRC = libffi.fs fflib.fs $(LIBCC_SRC)

# todo: strip down (really?)
GFORTH_SRC = $(GFORTH_FI_SRC) $(LIBCC_DIST_SRC) \
	ans-report.fs ansi.fs answords.fs \
	colorize.fs comp-i.fs complex.fs \
	depth-changes.fs dosekey.fs doskey.fs ds2texi.fs \
	envos.dos envos.os2 etags.fs fft.fs filedump.fs fi2c.fs \
	fsl-util.4th glosgen.fs gray.fs httpd.fs install-tags.fs \
	make-app.fs doc/makedoc.fs locate.fs more.fs onebench.fs \
	other.fs prims2x.fs prims2x0.6.2.fs proxy.fs random.fs \
	regexp.fs sokoban.fs string.fs table.fs tags.fs \
	tt.fs \
	unbuffer.fs wordsets.fs xwords.fs \
	test/tester.fs test/ttester.fs \
	test/coretest.fs test/postpone.fs test/dbltest.fs \
	test/string.fs test/float.fs test/search.fs test/gforth.fs \
	test/other.fs test/signals.fs test/checkans.fs \
	test/primtest.fs test/coreext.fs test/deferred.fs \
	test/coremore.fs test/gforth-nofast.fs test/libcc.fs \
	test/macros.fs \
	compat/strcomp.fs \
	bubble.fs siev.fs matrix.fs fib.fs \
	oof.fs oofsampl.fs objects.fs objexamp.fs mini-oof.fs moof-exm.fs \
	moofglos.fs fixpath.fs \
	add.fs lib.fs oldlib.fs sieve.fs \
	endtry-iferror.fs recover-endtry.fs

GFORTH_SHARE_DIR = /usr/share/gforth/$(PKG_VERSION)
GFORTH_LIB_DIR = /usr/lib/gforth/$(PKG_VERSION)
GFORTH_LIBCC_DIR = $(GFORTH_LIB_DIR)/libcc-named
GFORTH_BIN_DIR = /usr/bin
GFORTH_WRAPPED_BIN = gforth gforth-fast 

## Select files for package.  Note how we rename the GForth kernel image to
## 'kernel.fi' here, so that 'postinst' can refer to it without depending on
## architecture-specific naming.
define Package/gforth/install
        # create directories
	$(INSTALL_DIR) $(1)/$(GFORTH_BIN_DIR)
	$(INSTALL_DIR) $(1)/$(GFORTH_SHARE_DIR)
	$(INSTALL_DIR) $(1)/$(GFORTH_LIB_DIR)
	$(INSTALL_DIR) $(1)/$(GFORTH_LIBCC_DIR)
	$(INSTALL_DIR) $(1)/$(GFORTH_SHARE_DIR)/../site-forth

        # install low-level gforth binaries (for image generation)
	$(INSTALL_BIN) $(PKG_BUILD_DIR)/gforth-ditc $(1)/$(GFORTH_LIB_DIR)/
	$(INSTALL_BIN) $(PKG_BUILD_DIR)/gforthmi $(1)/$(GFORTH_BIN_DIR)/

        # Install (empty) site-init script
	$(INSTALL_DATA) $(PKG_BUILD_DIR)/siteinit.fs \
		$(1)/$(GFORTH_SHARE_DIR)/../site-forth/

        # install the correct Gforth kernel image
	echo "$(INSTALL_DATA) $(PKG_BUILD_DIR)/@kernel_fi@ $(1)/$(GFORTH_SHARE_DIR)/" > $(PKG_BUILD_DIR)/install-kernel.sh.in
	cd $(PKG_BUILD_DIR) && ./config.status --file install-kernel.sh
	. $(PKG_BUILD_DIR)/install-kernel.sh

        # install updating script and wrap gforth interpreter binaries so that 
        # image is generated on first attempt to run the interpreter.
	$(call pkg_install_bin, \
		gforth-wrapper gforth-update-image, \
		$(PKG_BUILD_DIR),$(1)/$(GFORTH_BIN_DIR))
	for i in $(GFORTH_WRAPPED_BIN); do \
	  ln -sf gforth-wrapper $(1)/$(GFORTH_BIN_DIR)/$$$$i; \
	  $(INSTALL_BIN) $(PKG_BUILD_DIR)/$$$$i \
		$(1)/$(GFORTH_BIN_DIR)/$$$$i.real; \
	done

        # install Gforth sources (for generating gforth.fi)
	$(call pkg_install_files, \
		$(GFORTH_SRC), \
		$(PKG_BUILD_DIR), \
		$(1)/$(GFORTH_SHARE_DIR))

        # install pre-generated C-interface wrappers (libcc)
	-for i in $(LIBCC_BUILD_SRC); do \
          which libtool; \
	  ls -l $(PKG_BUILD_LIBCC_DIR)/.libs; \
	  libtool --mode=install $(INSTALL_DATA) \
		$(PKG_BUILD_LIBCC_DIR)/`basename $$$$i .fs`.la \
		$(1)/$(GFORTH_LIBCC_DIR)/; \
		ls -l $(1)/$(GFORTH_LIBCC_DIR)/; \
	done
#	-libtool --finish $(1)/$(GFORTH_LIBCC_DIR)
	-rm -f $(1)/$(GFORTH_LIBCC_DIR)/*.a
endef

## Directly after installation generate updated interpreter image from
## installed source code.
define Package/gforth/postinst
#! /bin/sh
if [ -z "$$IPKG_OFFLINE_ROOT" ]; then
    # only attempt to update image on target, never on host
    $(GFORTH_BIN_DIR)/gforth-update-image
fi
endef

define Package/gforth/prerm
#! /bin/sh
if [ -z "$$IPKG_OFFLINE_ROOT" ]; then
    rm -f $(GFORTH_LIB_DIR)/gforth.fi
fi
endef

$(eval $(call HostBuild))
$(eval $(call BuildPackage,gforth))

# The following comments configure the Emacs editor.  Just ignore them.
# Local Variables:
# compile-command: "make -C ~/h/src/qi/openwrt-xburst package/gforth/compile -j2 V=99"
# End:
