# 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
OUT = build
OLEAN_OUT = $(OUT)
TEMP_OUT = $(OUT)/temp
BIN_OUT = $(OUT)/bin
LIB_OUT = $(OUT)/lib
BIN_NAME = $(PKG)
STATIC_LIB_NAME = lib$(PKG).a
LEAN_OPTS = @LEAN_EXTRA_MAKE_OPTS@
LEANC_OPTS = -O3 -DNDEBUG

SRCS = $(shell find $(PKG) -name '*.lean' 2> /dev/null || true; find $(PKG).lean 2> /dev/null)
DEPS = $(addprefix $(TEMP_OUT)/,$(SRCS:.lean=.depend))
export LEAN_PATH += :$(OLEAN_OUT)
OBJS = $(addprefix $(OLEAN_OUT)/, $(SRCS:.lean=.olean))

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

.PHONY: all bin lib depends clean

all: $(OBJS)

bin: $(BIN_OUT)/$(PKG)

lib: $(LIB_OUT)/$(STATIC_LIB_NAME)

depends: $(DEPS)

$(OLEAN_OUT)/$(PKG) $(LIB_OUT) $(BIN_OUT):
	@mkdir -p "$@"

# Make sure the .olean output directory exists so that `lean --deps` knows where this package's
# .olean files will be located even before any of them are actually built.
$(TEMP_OUT)/%.depend: %.lean | $(OLEAN_OUT)/$(PKG)
	@mkdir -p "$(TEMP_OUT)/$(*D)"
# use separate assignment to ensure failure propagation
# convert path separators and newlines on Windows
	@deps=`lean --deps $< | tr '\\\\' / | tr -d '\\r'`; echo $(OLEAN_OUT)/$(<:.lean=.olean): $$deps > $@

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

$(TEMP_OUT)/%.c: $(OLEAN_OUT)/%.olean
	@

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

$(BIN_OUT)/$(BIN_NAME): $(addprefix $(TEMP_OUT)/,$(SRCS:.lean=.o)) | $(BIN_OUT)
	@echo "[    ] Linking $@"
	leanc -o "$@" -x none $^

$(LIB_OUT)/$(STATIC_LIB_NAME): $(addprefix $(TEMP_OUT)/,$(SRCS:.lean=.o)) | $(LIB_OUT)
	@rm -f $@
	@ar rcs $@ $^

clean:
	rm -rf $(OUT)

.PRECIOUS: $(TEMP_OUT)/%.c

include $(DEPS)