OPTIMIZE ?= -O3
DEBUG ?= -g

AR ?= ar
CXX ?= g++

CXXFLAGS := -Wall -Werror -std=c++20 -fPIC -iquote . ${OPTIMIZE} ${DEBUG}

libname = $(shell realpath --canonicalize-missing --relative-to . build/$(dir $(1))/lib$(notdir $(1)))

PARTS := $(shell find * -type d -\( -name build -prune -o -name tools -prune -o -print -\))
PARTARS := $(foreach part, ${PARTS}, $(call libname, ${part}.a))
PARTSOS := $(foreach part, ${PARTS}, $(call libname, ${part}.so))

MAINOBJS := $(patsubst %.cpp, build/%.o, $(wildcard *.cpp))
MAINOBJS += build/git-tag.o

HEADERS := $(find -type f -name \*.h)

all: issim

issim: build/issim-dynamic
	@ln -sf $< $@
.PHONY: issim

issim-static: build/issim-static
	@ln -sf $< $@
.PHONY: issim-static

build/issim-dynamic: ${MAINOBJS} ${PARTSOS}
	@mkdir -p $(dir $@)
	${CXX} ${CXXFLAGS} -o $@ $+

build/issim-static: ${MAINOBJS} ${PARTARS}
	@mkdir -p $(dir $@)
	${CXX} ${CXXFLAGS} -o $@ $+

clean:
	rm -rf build issim issim-static
.PHONY: clean

build/git-tag.cpp:
	@mkdir -p $(dir $@)
	tools/get-git-tag > $@
.PHONY: build/git-tag.cpp

include $(shell find -type f -name \*.d)

build/%.o: %.cpp
	@mkdir -p $(dir $@)
	${CXX} ${CXXFLAGS} -MMD -c -o $@ $<

build/%.o: build/%.cpp
	@mkdir -p $(dir $@)
	${CXX} ${CXXFLAGS} -MMD -c -o $@ $<

define mklib =
$(call libname, $(1).a): $(patsubst %.cpp, build/%.o, $(wildcard $(1)/*.cpp))
	@mkdir -p $$(dir $$@)
	$${AR} cr $$@ $$+

$(call libname, $(1).so): $(patsubst %.cpp, build/%.o, $(wildcard $(1)/*.cpp))
	@mkdir -p $$(dir $$@)
	$${CXX} $${CXXFLAGS} -shared -o $$@ $$+
endef

$(foreach part, ${PARTS}, $(eval $(call mklib, ${part})))

.SUFFIXES:
.SECONDARY: