Makefile

DEBUG       ?= 0
ASAN        ?= 0
TEXTURE_DBG ?= 0

ELF         := texture2c.elf

CC          := clang
INC        := -I include -I lib
WARNINGS    := -Wall -Wextra -Wpedantic -Wshadow -Werror=implicit-function-declaration -Wvla
CFLAGS      := -std=c11
LDFLAGS     := -lpng

ifeq ($(DEBUG),0)
  OPTFLAGS  := -Os
else
  OPTFLAGS  := -O0 -g3
endif
ifneq ($(TEXTURE_DBG),0)
  CFLAGS    += -DTEXTURE_DEBUG
endif

ifneq ($(ASAN),0)
  CFLAGS    += -fsanitize=address -fsanitize=pointer-compare -fsanitize=pointer-subtract -fsanitize=undefined
endif

SRC_DIRS    := $(shell find src -type d)
C_FILES     := $(foreach dir,$(SRC_DIRS),$(wildcard $(dir)/*.c))
H_FILES     := $(foreach dir,$(INC),$(wildcard $(dir)/*.h))
O_FILES     := $(foreach f,$(C_FILES:.c=.o),build/$f)

LIB_DIRS    := $(shell find lib -type d)
C_LIB_FILES := $(foreach dir,$(LIB_DIRS),$(wildcard $(dir)/*.c))
O_LIB_FILES := $(foreach f,$(C_LIB_FILES:.c=.o),build/$f)

# Main targets
all: $(ELF)

clean:
	$(RM) -r build $(ELF)

format:
	clang-format-11 -i $(C_FILES) $(H_FILES)

.PHONY: all clean format

# create build directories
$(shell mkdir -p $(foreach dir,$(SRC_DIRS),build/$(dir)) $(foreach dir,$(LIB_DIRS),build/$(dir)))

$(ELF): $(O_FILES) $(O_LIB_FILES)
	$(CC) $(INC) $(WARNINGS) $(CFLAGS) $(OPTFLAGS) $(LDFLAGS) -o $@ $^

build/%.o: %.c $(H_FILES)
	$(CC) -c $(INC) $(WARNINGS) $(CFLAGS) $(OPTFLAGS) -o $@ $<

build/lib/%.o: lib/%.c
	$(CC) -c $(INC) $(WARNINGS) $(CFLAGS) $(OPTFLAGS) -o $@ $<