# Copyright (c) 2018 Simon Hudon. All rights reserved.
# Released under Apache 2.0 license as described in the file LICENSE.
# Authors: Simon Hudon, Sebastian Ullrich, Leonardo de Moura
LEAN = ../../bin/lean
LEANC = ../../bin/leanc
SRCS = $(shell find . -name '*.lean')
DEPS = $(SRCS:.lean=.depend)
OPTS = @LEAN_EXTRA_MAKE_OPTS@
STAGE0_DIR = ../../stage0
STAGE1_C_OUT ?= ../stage1/Init
ifndef STAGE1_OUT
$(error "`STAGE1_OUT` must be set (use cmake)")
endif
STAGE1_OLEAN_OUT ?= .
OBJS = $(addprefix $(STAGE1_OLEAN_OUT), $(SRCS:.lean=.olean))
# ensure deterministic ordering
CS_CORE=$(addprefix Init/,$(sort $(patsubst %.lean,%.c,$(SRCS))))

SHELL = /usr/bin/env bash -eo pipefail

.PHONY: all clean

all: $(OBJS)

depends: $(DEPS)

%.depend: %.lean
# use separate assignment to ensure failure propagation
	@deps=`$(LEAN) --deps $< | python relative.py`; echo $(<:.lean=.olean): $$deps > $@

$(STAGE1_OLEAN_OUT)/%.olean: %.lean %.depend $(MORE_DEPS)
	@echo "[    ] Building $<"
	@mkdir -p $(STAGE1_OLEAN_OUT)/$(*D) $(STAGE1_C_OUT)/$(*D)
	$(LEAN) $(OPTS) --make=$@ --c="$(STAGE1_C_OUT)/$*.c.tmp" $<
# create the .c file atomically
	mv "$(STAGE1_C_OUT)/$*.c.tmp" "$(STAGE1_C_OUT)/$*.c"
# make sure the .olean file is newer than the .depend file to prevent infinite make cycles
	@touch $@

$(STAGE1_C_OUT)/%.c: $(STAGE1_OLEAN_OUT)/%.olean
	@

$(STAGE1_OUT)/%.o: $(STAGE1_C_OUT)/%.c
	@echo "[    ] Building $<"
	@mkdir -p "$(@D)"
	$(LEANC) -c -o $@ $< $(LEANC_OPTS)

$(STAGE1_OUT)/libleanstdlib.a: $(addprefix $(STAGE1_OUT)/,$(patsubst %.lean,%.o,$(SRCS)))
	@rm -f $@
	@ar rcs $@ $^

update-stage0:
	-rm -r $(STAGE0_DIR)
	-mkdir -p $(STAGE0_DIR)/stdlib
	cp -R $(STAGE1_C_OUT) $(STAGE0_DIR)/stdlib/Init
	echo "add_library (stage0 OBJECT $(CS_CORE))" > $(STAGE0_DIR)/stdlib/CMakeLists.txt
# don't copy untracked crap
	cd ..; git ls-files -z . | xargs -0 -I '{}' bash -c 'mkdir -p `dirname ../stage0/src/{}` && cp {} ../stage0/src/{}'
	-git add $(STAGE0_DIR)

.PRECIOUS: %.depend $(STAGE1_C_OUT)/%.c

include $(DEPS)