#This program is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation, either version 3 of the License, or
#(at your option) any later version.

#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.

#You should have received a copy of the GNU General Public License
#along with this program. If not, see <http://www.gnu.org/licenses/>.

#Copyright 2018-2019 rexy712

#Makefile to generate a single executable from all sources in SOURCE_DIRS that end in EXT

ifeq ($(OS),Windows_NT)
	WINDOWS=1
endif

SOURCE_DIRS::=src
OBJDIR::=obj
DEPDIR::=$(OBJDIR)/dep
LIBDIR::=lib
INCLUDE_DIRS::=include
CXXFLAGS::=-g -std=c++17 -Wall -pedantic -Wextra
EXT::=cpp
MAIN_EXECUTABLE::=tester

ifneq ($(WINDOWS),1)
	CXX::=g++
	LDLIBS::=
	LDFLAGS::=
	STRIP?=strip
	RANLIB?=ranlib
	AR?=ar
	AS?=as
else
	MINGW_PREFIX::=x86_64-w64-mingw32-
	CXX::=$(MINGW_PREFIX)g++
	LDLIBS::=
	LDFLAGS::=
	STRIP?=$(MINGW_PREFIX)strip
	RANLIB?=$(MINGW_PREFIX)ranlib
	AR?=$(MINGW_PREFIX)ar
	AS?=$(MINGW_PREFIX)as
	MAIN_EXECUTABLE::=$(MAIN_EXECUTABLE).exe
endif

all: CXXFLAGS+=-O0
release: CXXFLAGS+=-O2

memchk: LDFLAGS+=-fsanitize=address -fno-omit-frame-pointer -fno-optimize-sibling-calls
memchk: CXXFLAGS+=-O0 -fsanitize=address -fno-omit-frame-pointer -fno-optimize-sibling-calls

ifeq ($(OS),Windows_NT)
	mkdir=mkdir $(subst /,\,$(1)) > NUL 2>&1
	rm=del /F $(1) > NUL 2>&1
	rmdir=rd /S /Q $(1) > NUL 2>&1
	move=move /Y $(subst /,\,$(1)) $(subst /,\,$(2)) > NUL 2>&1
	copy=copy /Y /B $(subst /,\,$(1)) $(subst /,\,$(2)) > NUL 2>&1
else
	mkdir=mkdir -p $(1)
	rm=rm -f $(1)
	rmdir=rm -rf $(1)
	move=mv $(1) $(2)
	copy=cp $(1) $(2)
endif

INTERNAL_CXXFLAGS=-c $(foreach dir,$(INCLUDE_DIRS),-I"$(dir)") -MMD -MP -MF"$(DEPDIR)/$(notdir $(patsubst %.o,%.d,$@))"
SOURCES::=$(foreach source,$(SOURCE_DIRS),$(foreach ext,$(EXT),$(wildcard $(source)/*.$(ext))))
OBJECTS::=$(addprefix $(OBJDIR)/,$(subst \,.,$(subst /,.,$(addsuffix .o,$(SOURCES)))))

.PHONY: all
all: $(MAIN_EXECUTABLE)
.PHONY: memchk
memchk: all

$(MAIN_EXECUTABLE): $(OBJECTS)
	$(CXX) $(LDFLAGS) $^ -o "$(basename $@)" $(LDLIBS)

.PHONY: release
release: $(OBJECTS)
	$(CXX) $(LDFLAGS) $^ -o "$(basename $(MAIN_EXECUTABLE))" $(LDLIBS)
	$(STRIP) --strip-all "$(MAIN_EXECUTABLE)"

define GENERATE_OBJECTS

$$(OBJDIR)/$(subst \,.,$(subst /,.,$(1))).%.o: $(1)/%
	$$(CXX) $$(CXXFLAGS) $$(INTERNAL_CXXFLAGS) "$$<" -o "$$@"

endef

$(foreach dir,$(SOURCE_DIRS),$(eval $(call GENERATE_OBJECTS,$(dir))))
$(OBJECTS): | $(OBJDIR) $(DEPDIR)

$(OBJDIR):
	$(call mkdir,"$@")
$(DEPDIR):
	$(call mkdir,"$@")

.PHONY: clean
clean:
	$(call rmdir,"$(DEPDIR)")
	$(call rmdir,"$(OBJDIR)")
	$(call rm,"$(MAIN_EXECUTABLE)")
ifneq ($(OS),Windows_NT)
	$(call rm,"$(MAIN_EXECUTABLE).exe")
endif

-include $(wildcard $(DEPDIR)/*.d)