Makefile

src_dir ?= src
build_dir ?= build/
main ?= main
mode ?= debug

arch ?= $(shell uname -m)
os ?= $(shell uname -s | tr '[:upper:]' '[:lower:]')

ifeq ($(os), linux)
abi = musl
else ifeq ($(os), windows)
abi = gnu
else
$(error Unsupported OS)
endif

target ?= $(arch)-$(os)-$(abi)
cflags = -Wall -Wextra -Werror -std=c23

ifneq ($(shell which zig 2>/dev/null),)
cc = zig cc -target $(target)
else
$(error Zig is not installed or not available on the system)
endif

ifeq ($(mode), debug)
cflags += -g -O0
else ifeq ($(mode), release)
cflags += -O2 -s
else ifeq ($(mode), release-fast)
cflags += -O3 -s
else ifeq ($(mode), release-small)
cflags += -Oz
else
$(error Unknown build mode)
endif

obj_dir = $(dir $(build_dir))/$(target)/$(mode)/obj
bin_dir = $(dir $(build_dir))/$(target)/$(mode)

SRC_FILES = $(shell find $(src_dir) -type f -name "*.c")
OBJ_FILES = $(patsubst $(src_dir)/%.c, $(obj_dir)/%.o, $(SRC_FILES))

.PHONY: build 
build: $(OBJ_FILES) $(bin_dir)/$(main)

.PHONY: help
help:
	@echo "Available targets:"
	@echo "  build     : Build the project (default)"
	@echo "  clean     : Clean the build directory"
	@echo "  help      : Display this help message"
	@echo ""
	@echo "Build modes:"
	@echo "  debug     : Build with debug symbols and no optimization"
	@echo "  release   : Build with optimization level 2 and no debug symbols"
	@echo "  release-fast : Build with optimization level 3 and no debug symbols"
	@echo "  release-small : Build with size optimization and no debug symbols"
	@echo ""
	@echo "Variables:"
	@echo "  src_dir   : Specify the source directory (default: src)"
	@echo "  build_dir : Specify the build directory (default: build/)"
	@echo "  main      : Specify the main executable name (default: nisi)"
	@echo "  mode      : Specify the build mode (default: debug)"
	@echo "  os        : Specify the target OS (default: your OS)"
	@echo "  abi       : Specify the target ABI (default: musl on Linux, gnu on Windows)"
	@echo "  arch      : Specify the target architecture (default: your arch)"
	@echo "  target    : Specify the target triple (default: arch-os-abi)"

$(obj_dir)/%.o: $(src_dir)/%.c
		@mkdir -p $(dir $@)
		$(cc) $(cflags) -c $< -o $@

$(bin_dir)/$(main): $(OBJ_FILES)
		@mkdir -p $(dir $@)
		$(cc) $(cflags) $^ -o $@

.PHONY: clean
clean:
	rm -rf $(build_dir)