# Compiler to use
CC ?= gcc

# Add debugging output
$(info CC is set to $(CC))

# Separate CFLAGS and LDFLAGS
CFLAGS = -Wall -Wextra -std=gnu17 -I include
LDFLAGS = -lelf

# Add potential additional library path (update this path if needed)
LIBRARY_PATH := /usr/lib/x86_64-linux-gnu
LDFLAGS += -L$(LIBRARY_PATH)

# Add debugging output
$(info CFLAGS is set to $(CFLAGS))
$(info LDFLAGS is set to $(LDFLAGS))

# 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)

# 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)
	@echo "Linking $(TARGET)"
	@echo "Command: $(CC) $(CFLAGS) $^ -o $@ $(LDFLAGS)"
	$(CC) $(CFLAGS) $^ -o $@ $(LDFLAGS)
	@echo "Linking complete"
	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
	@echo "Compiling $<"
	@echo "Command: $(CC) $(CFLAGS) -c $< -o $@"
	$(CC) $(CFLAGS) -c $< -o $@
	@echo "Compilation complete"

# 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)

# Add a new target to print library information
.PHONY: libinfo
libinfo:
	@echo "Searching for libelf..."
	@find /usr -name "libelf.so*" 2>/dev/null || echo "libelf not found in /usr"
	@echo "Library search path:"
	@echo $(LD_LIBRARY_PATH)
	@echo "Compiler search path:"
	$(CC) -print-search-dirs