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

PROJECT=day1
AUTHOR=Avril (Flanchan) <flanchan@cumallover.me>
VERSION=0.0.0

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

INCLUDE=include

# Link to these libraries dynamicalls
SHARED_LIBS= 
# Link to these libraries statically
STATIC_LIBS= 

override __VERSION_SPLIT:= $(subst ., ,$(VERSION))
override __VERSION_REVISION:=$(word 3,$(__VERSION_SPLIT)) 0
override __VERSION_SPLIT:= MAJOR:$(word 1,$(__VERSION_SPLIT)) MINOR:$(word 2,$(__VERSION_SPLIT)) BUGFIX:$(word 1,$(subst r, ,$(__VERSION_REVISION))) REVISION:$(word 2,$(subst r, ,$(__VERSION_REVISION))) REVISION_STRING:$(word 3,$(__VERSION_SPLIT))

COMMON_FLAGS+= -W -Wall -Wstrict-aliasing -fno-strict-aliasing $(addprefix -I,$(INCLUDE))
COMMON_FLAGS+= $(addprefix -D_VERSION_,$(subst :,=,$(__VERSION_SPLIT))) '-D_VERSION="$(VERSION)"'

# Target arch. Set to blank for generic
ARCH?=native
# Enable OpenMP and loop parallelisation? (dyn-links to openmp)
PARALLEL?=yes

OPT_FLAGS?= -fgraphite \
	    -floop-interchange -ftree-loop-distribution -floop-strip-mine -floop-block \
	    -fno-stack-check

ifneq ($(ARCH),)
	OPT_FLAGS+= $(addprefix -march=,$(ARCH))
endif

ifeq ($(PARALLEL),yes)
	OPT_FLAGS+= -fopenmp -floop-parallelize-all -ftree-parallelize-loops=4
endif

CXX_OPT_FLAGS?= $(OPT_FLAGS) -felide-constructors

CSTD?=gnu2x
CXXSTD?=gnu++23

CFLAGS   += $(COMMON_FLAGS) --std=$(CSTD)
CXXFLAGS += $(COMMON_FLAGS) --std=$(CXXSTD)
LDFLAGS  += $(addsuffix .a,$(addprefix -l:lib,$(STATIC_LIBS))) $(addprefix -l,$(SHARED_LIBS))


STRIP=strip

RELEASE_COMMON_FLAGS+= -fno-bounds-check
DEBUG_COMMON_FLAGS+= -ggdb -gz -fanalyzer -ftrapv -fbounds-check

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	
	DEBUG_CXXFLAGS?= -Og

	DEBUG_LDFLAGS?=
endif

DEBUG_CFLAGS+=-DDEBUG $(DEBUG_COMMON_FLAGS)
DEBUG_CXXFLAGS+=-DDEBUG $(DEBUG_COMMON_FLAGS) -fasynchronous-unwind-tables

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

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}