# Compiler to use
CC ?= gcc

CFLAGS = -Wall -Wextra -std=gnu17 -I include -lelf

# Directory for build outputs
BUILD_DIR := build-$(uname -i)

# Name of the output program
PROGRAM_NAME ?= criscv

# Find all .c files in the source directory
SRCS := $(wildcard src/*.c)

# Generate corresponding .o file names in the build/obj directory
OBJS := $(patsubst src/%.c,$(BUILD_DIR)/obj/%.o,$(SRCS))

# Name of the final executable
TARGET := $(BUILD_DIR)/$(PROGRAM_NAME)


# Default target: build the executable
all: CFLAGS += -O3
all: $(TARGET)

# Debug target
debug: CFLAGS += -O0 -g
debug: $(TARGET)

# Declare 'all' and 'clean' as phony targets (not files)
.PHONY: all debug clean

# Rule to link object files into the final executable
$(TARGET): $(OBJS) | $(BUILD_DIR)
	$(CC) $(CFLAGS) $^ -o $@
	du -b $(TARGET)  # Size of the executable in bytes

# Rule to compile source files into object files
$(BUILD_DIR)/obj/%.o: src/%.c | $(BUILD_DIR)/obj
	$(CC) $(CFLAGS) -c $< -o $@

# Create build directories if they don't exist
$(BUILD_DIR) $(BUILD_DIR)/obj:
	mkdir -p $@

# Clean target: remove the build directory
clean:
	rm -rf $(BUILD_DIR)