# Compiler to use
CC := gcc

# Compiler flags:
# -Wall: Enable all warnings
# -Wextra: Enable extra warnings
# -std=gnu23: Use GNU C23 standard
# -I include: Add 'include' directory to the include path
# -O3: Optimize code (level 3)
# -Wno-unused-variable: Disable warnings for unused variables
ifeq ($(DEBUG),1)
  CFLAGS := -Wall -Wextra -std=gnu23 -I include -O0 -g
else
  CFLAGS := -Wall -Wextra -std=gnu23 -I include -O3
endif

# Directory for build outputs
BUILD_DIR := build

# 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)



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

# Default target: build the executable
all: $(TARGET)

# 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)