# Makefile for the whole bare-metal C toolchain (binutils, gcc, newlib)

# arch name
target ?= xxx
TARGET ?= $(target)-elf

# install dir
DESTDIR = /tmp/$(target)

# build dirs
BUILDROOT = $(HOME)/build/$(target)
SRCBUILDDIR = $(BUILDROOT)/binutils
LIBBUILDDIR = $(BUILDROOT)/newlib
GCCELFBUILDDIR = $(BUILDROOT)/gccelf
GCCLIBBUILDDIR = $(BUILDROOT)/gcclib

# source dirs
GCCDIR = $(HOME)/gcc/src
SRCDIR = $(HOME)/cygnus/src

# build flags
BUILD_CC = ccache gcc
BUILD_CFLAGS = -g3 -O0 -Wall -pipe
SRCMAINT = --enable-maintainer-mode --enable-cgen-maint
GCCMAINT = --enable-maintainer-mode --enable-checking
LIBMAINT =

# misc
export PATH := $(DESTDIR)/bin:$(PATH)
NPROCS := $(shell getconf _NPROCESSORS_ONLN)
NJOBS := $(shell expr $(NPROCS) '*' 2)
TOUCH = touch
MK = make -j $(NJOBS)

all: gcclib-make

# binutils

binutils-configure:
	mkdir -p $(SRCBUILDDIR)
	cd $(SRCBUILDDIR) &&							\
	CC="$(BUILD_CC)" CFLAGS="$(BUILD_CFLAGS)"				\
	 $(SRCDIR)/configure --target=$(TARGET) $(SRCMAINT) --prefix=$(DESTDIR)
	$(TOUCH) $@

binutils-make: binutils-configure
	$(MK) -C $(SRCBUILDDIR) $(patsubst %,all-%,binutils gas ld sim)
	$(MK) -C $(SRCBUILDDIR) $(patsubst %,install-%,binutils gas ld sim)
	$(TOUCH) $@

# initial gcc

gccelf-configure: binutils-make
	mkdir -p $(GCCELFBUILDDIR)
	cd $(GCCELFBUILDDIR) &&						\
	CC="$(BUILD_CC)" CFLAGS="$(BUILD_CFLAGS)"			\
	 $(GCCDIR)/configure --target=$(TARGET) --prefix=$(DESTDIR)	\
	 --enable-languages=c --disable-libssp --with-newlib
	$(TOUCH) $@

gccelf-make: gccelf-configure
	$(MK) -C $(GCCELFBUILDDIR)
	$(MK) -C $(GCCELFBUILDDIR) install
	$(TOUCH) $@

# newlib

newlib-configure: gccelf-make
	mkdir -p $(LIBBUILDDIR)
	cd $(LIBBUILDDIR) &&							\
	CC="$(BUILD_CC)" CFLAGS="$(BUILD_CFLAGS)"				\
	 $(SRCDIR)/configure --target=$(TARGET) $(LIBMAINT) --prefix=$(DESTDIR)
	$(TOUCH) $@

newlib-make: newlib-configure
	$(MK) -C $(LIBBUILDDIR) CC_FOR_TARGET=$(TARGET)-gcc \
	 all-target-newlib all-target-libgloss
	$(MK) -C $(LIBBUILDDIR) CC_FOR_TARGET=$(TARGET)-gcc \
	 install-target-newlib install-target-libgloss
	$(TOUCH) $@

# gcc for newlib

gcclib-configure: newlib-make
	mkdir -p $(GCCLIBBUILDDIR)
	cd $(GCCLIBBUILDDIR) &&						\
	CC="$(BUILD_CC)" CFLAGS="$(BUILD_CFLAGS)"			\
	 $(GCCDIR)/configure --target=$(TARGET) --prefix=$(DESTDIR)	\
	 --enable-languages=c --disable-libssp --with-newlib		\
	 --with-headers=$(DESTDIR)/$(TARGET)/include
	$(TOUCH) $@

gcclib-make: gcclib-configure
	$(MK) -C $(GCCLIBBUILDDIR)
	$(MK) -C $(GCCLIBBUILDDIR) install
	$(TOUCH) $@

# run gcc test suite

check: gcclib-make
	$(MK) -C $(GCCLIBBUILDDIR)/gcc check \
	 RUNTESTFLAGS="--target_board=$(target)-sim $(RUNTESTFLAGS)"
	tail $(GCCLIBBUILDDIR)/gcc/testsuite/gcc/gcc.log
# clean

clean:
	$(RM) -r *-configure *-make $(DESTDIR) $(BUILDROOT)

.PHONY: clean all check