Makefile for the rump kernel python package

Makefile

# XXX
# When building the latest version of Python (3.5.1) some binaries are built in order
# to build other binaries. For example, we need the Parser/pgen binary to generate a 
# parser from the Grammar file. This requires us to build some *host* binaries before
# we apply patches and build the target (-rumprun) version of Python.
#
# The problem is that the 'hostbuild' task looks like it could be done better. I'm
# looking for ideas to improve that piece.

include ../Makefile.inc

UPSTREAM=https://www.python.org/ftp/python/3.5.1/Python-3.5.1.tar.xz
TARBALL=$(notdir $(UPSTREAM))
ARCH=$(shell $(RUMPRUN_CC) -dumpmachine)

all: $(RUMPRUN_PKGS_DIR)/lib/libsqlite.a images

.NOTPARALLEL: $(RUMPRUN_PKGS_DIR)/lib/libsqlite.a
$(RUMPRUN_PKGS_DIR)/lib/libsqlite.a:
	$(MAKE) -C ../sqlite

build/python: build/Makefile
	$(MAKE) -C build
	$(MAKE) -C build install

PYTHON_CONF_ENV += \
	LDFLAGS="-static -static-libgcc" \
	CPPFLAGS="$(CPPFLAGS) -static" \
	CFLAGS="$(CFLAGS) -static" \
	CC=$(RUMPRUN_CC) \
	CONFIG_SITE=config.site

PYTHON_CONF_OPTS += \
	--prefix=$(shell pwd)/build/pythondist \
	--disable-shared \
	--host=$(RUMPRUN_TOOLCHAIN_TUPLE) \
	--build $(ARCH) \
	--enable-ipv6 \
        --without-ensurepip

# XXX We have to build python for the host system because we will need
# to use the python, Parser/pgen, and freeze_importlib binaries to build
# to build the the target.
# This step happens without any rumpkernel patches
hostbuild: | dl/$(TARBALL)
  # XXX Make the build directory and untar Python
	mkdir -p build
	(cd build && tar -x --strip-components 1 -f ../dl/$(TARBALL))

  # XXX Build the relevant host pieces and rename them
	(cd build; ./configure; make python Parser/pgen)
	mv build/python build/hostpython
	mv build/Parser/pgen build/Parser/hostpgen
	mv build/Programs/_freeze_importlib build/Programs/host_freeze_importlib

  # XXX Clean up. After this task is finished, we apply patches
  # and then build the cross compiled target python
	(cd build; make distclean)

build/Makefile: build/stamp_patch
	(cd build; $(PYTHON_CONF_ENV) ./configure $(PYTHON_CONF_OPTS))

build/stamp_patch: build/configure patches/*
	cp config.site build/
	(cd build && ../../scripts/apply-patches.sh ./ ../patches/*)
	touch $@

dl/$(TARBALL):
	mkdir -p dl
	../scripts/fetch.sh ${UPSTREAM} dl/$(TARBALL)

build/configure: hostbuild

.PHONY: images
images: images/stubetc.iso

images/stubetc.iso: images/python.iso ../stubetc/etc/*
	mkdir -p images
	genisoimage -l -r -o images/stubetc.iso ../stubetc/etc

images/python.iso: build/python
	mkdir -p images
	genisoimage -l -r -o images/python.iso build/pythondist/lib/python3.5

.PHONY: clean
clean:
	-$(MAKE) -C build clean
	rm -f bin/*
	rm -f images/stubetc.iso images/python.iso
	rm -f examples/hw.c examples/hw.bin examples/hw

.PHONY: distclean
distclean: clean
	rm -rf build