# Generic C and C++ Makefile project template
# Contains targets for `release', `debug', and `clean'.

PROJECT=rng
AUTHOR=Avril (Flanchan) <flanchan@cumallover.me>

SRC_C   = $(wildcard src/*.c) $(wildcard src/rng/*.c)
SRC_CXX = $(wildcard src/*.cpp) $(wildcard src/rng/*.cpp)

INCLUDE=include

COMMON_FLAGS= -W -Wall -pedantic -fno-strict-aliasing $(addprefix -I,$(INCLUDE))

OPT_FLAGS?= -march=native -fgraphite -fopenmp -floop-parallelize-all -ftree-parallelize-loops=4 \
	    -floop-interchange -ftree-loop-distribution -floop-strip-mine -floop-block \
	    -fno-stack-check

CXX_OPT_FLAGS?= $(OPT_FLAGS) -felide-constructors

CFLAGS   += $(COMMON_FLAGS) --std=gnu17
CXXFLAGS += $(COMMON_FLAGS) --std=gnu++20
LDFLAGS  +=  

STRIP=strip

RELEASE_COMMON_FLAGS+= -Werror
DEBUG_COMMON_FLAGS+= -fanalyzer 

ifneq ($(TARGET_SPEC_FLAGS),no)
	RELEASE_CFLAGS?=   -O3 -flto $(OPT_FLAGS)
	RELEASE_CXXFLAGS?= -O3 -flto $(CXX_OPT_FLAGS)
	RELEASE_LDFLAGS?=  -Wl,-O3 -Wl,-flto

	DEBUG_CFLAGS?=	-Og -g
	DEBUG_CXXFLAGS?=-O0 -g
	DEBUG_LDFLAGS?=
endif

DEBUG_CFLAGS+=-DDEBUG $(DEBUG_COMMON_FLAGS)
DEBUG_CXXFLAGS+=-DDEBUG $(DEBUG_COMMON_FLAGS)

RELEASE_CFLAGS+=-DRELEASE $(RELEASE_COMMON_FLAGS)
RELEASE_CXXFLAGS+=-DRELEASE $(RELEASE_COMMON_FLAGS)

# Objects

OBJ_C   = $(addprefix obj/c/,$(SRC_C:.c=.o))
OBJ_CXX = $(addprefix obj/cxx/,$(SRC_CXX:.cpp=.o))
OBJ = $(OBJ_C) $(OBJ_CXX)

# Phonies

.PHONY: release
release: | dirs $(PROJECT)-release

.PHONY: debug
debug: | dirs $(PROJECT)-debug

# Targets

dirs:
	@mkdir -p obj/c{,xx}/src{,/rng}

obj/c/%.o: %.c
	$(CC) -c $< $(CFLAGS) -o $@ $(LDFLAGS)

obj/cxx/%.o: %.cpp
	$(CXX) -c $< $(CXXFLAGS) -o $@ $(LDFLAGS)

$(PROJECT)-release: CFLAGS+= $(RELEASE_CFLAGS)
$(PROJECT)-release: CXXFLAGS += $(RELEASE_CXXFLAGS)
$(PROJECT)-release: LDFLAGS += $(RELEASE_LDFLAGS)
$(PROJECT)-release: $(OBJ)
	$(CXX) $^ $(CXXFLAGS) -o $@ $(LDFLAGS)
	$(STRIP) $@

$(PROJECT)-debug: CFLAGS+= $(DEBUG_CFLAGS)
$(PROJECT)-debug: CXXFLAGS += $(DEBUG_CXXFLAGS)
$(PROJECT)-debug: LDFLAGS += $(DEBUG_LDFLAGS)
$(PROJECT)-debug: $(OBJ)
	$(CXX) $^ $(CXXFLAGS) -o $@ $(LDFLAGS)

clean-rebuild:
	rm -rf obj

clean: clean-rebuild
	rm -f $(PROJECT)-{release,debug,pgo}