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# Basic vars
OUT_DIR = out
SRC = src
BUILD = build
BOCHS = bochs
TESTS = tests
TEST = $(TESTS)/debug.rc
BOCHSRC = $(TESTS)/bochsrc
TARGET = i686-elf
ISO = gftos
DIST = $(ISO).tgz
# Define source files
ASM := $(sort $(shell find $(SRC) -name '*.s'))
C := $(sort $(shell find $(SRC) -name '*.c'))
# Includes
INCLUDE_DIR = $(SRC)/include
INCLUDES := -I$(INCLUDE_DIR)
# Compiler / assembler
ASSEMBLER = nasm -felf32
CC = $(TARGET)-gcc
CFLAGS = $(INCLUDES) -std=gnu99 -ffreestanding -O2 -Wall -Wextra
TEST_FLAGS = -nographic
# Linker info
LINK_FILE = linker.ld
LDFLAGS = -O2 -nostdlib -lgcc -ffreestanding
# Objects
OBJS =
C_OBJS := $(C:$(SRC)/%.c=$(BUILD)/%.o)
ASM_OBJS := $(ASM:$(SRC)/%.s=$(BUILD)/%.o)
# CRTI/CRTN objects
CRTBEGIN_OBJ := $(shell $(CC) $(CFLAGS) -print-file-name=crtbegin.o)
CRTEND_OBJ := $(shell $(CC) $(CFLAGS) -print-file-name=crtend.o)
CRTI_OBJ = $(BUILD)/boot/crti.o
CRTN_OBJ = $(BUILD)/boot/crtn.o
# Add objects in order
OBJS += $(CRTI_OBJ) $(CRTBEGIN_OBJ)
OBJS += $(C_OBJS) $(ASM_OBJS)
OBJS += $(CRTEND_OBJ) $(CRTN_OBJ)
# Objects we make & dependencies
INTERNAL_OBJS = $(CRTI_OBJ) $(ASM_OBJS) $(C_OBJS) $(CRTN_OBJ)
DEPS := $(OBJS:.o=.d)
# Compile DB
COMPDBS := $(C_OBJS:.o=.json)
.PHONY: all
# Build gftos
all: $(OUT_DIR)/$(ISO).iso
.PHONY: run
# Run gftos in qemu
run: all
@qemu-system-i386 -cdrom $(OUT_DIR)/$(ISO).iso
@echo "QEMU \t$(OUT_DIR)/$(ISO).iso"
.PHONY: test
# Generate logfiles using bochs
test: all
@mkdir -p $(BOCHS)
@bochs -f $(BOCHSRC) -q -rc $(TEST) > /dev/null 2>&1
@echo "BOCHS \t$(TEST)"
.PHONY: clean
# Clean the build environment
clean:
@rm -rf $(BOCHS)
@echo "RM \t$(BOCHS)"
@rm -rf $(INTERNAL_OBJS)
@for F in $(INTERNAL_OBJS); \
do echo "RM \t$$F"; done
@rm -rf $(OUT_DIR)/$(ISO).iso
@echo "RM \t$(OUT_DIR)/$(ISO).iso"
@rm -rf $(OUT_DIR)/isodir/boot/$(ISO).bin
@echo "RM \t$(OUT_DIR)/isodir/boot/$(ISO).bin"
@rm -rf $(BUILD)
@echo "RM \t$(BUILD)"
@rm -rf $(DIST)
@echo "RM \t$(DIST)"
.PHONY: compdb
# Generate JSON compilation database
compdb: $(BUILD)/compile_commands.json
.PHONY: dist
# Pack the source into a tar file
dist: clean
@tar zcvf $(DIST) * >/dev/null
@echo "TAR \t$(DIST)"
# https://stackoverflow.com/a/35730928
.PHONY: help
# Show this help.
help:
@awk '/^#/{c=substr($$0,3);next}c&&/^[[:alpha:]][[:alnum:]_-]+:/{print substr($$1,1,index($$1,":")),c}1{c=0}' $(MAKEFILE_LIST) | column -s: -t
# ISO recipe (requires .bin)
$(OUT_DIR)/$(ISO).iso : $(OUT_DIR)/isodir/boot/$(ISO).bin
@grub-mkrescue -o $@ $(OUT_DIR)/isodir 2>/dev/null
@echo "GRUB \t$<"
# .bin Recipe (requires objects)
$(OUT_DIR)/isodir/boot/$(ISO).bin : $(OBJS)
@$(CC) -T $(SRC)/$(LINK_FILE) -o $@ $(LDFLAGS) $^
@echo "LD \t$(SRC)/$(LINK_FILE)"
# ASM object recipes
$(BUILD)/%.o: $(SRC)/%.s
@mkdir -p $(BUILD)
@mkdir -p $(@D)
@$(ASSEMBLER) $^ -o $@
@echo "AS \t$<"
# C object recipes
$(BUILD)/%.o: $(SRC)/%.c
@mkdir -p $(BUILD)
@mkdir -p $(@D)
@$(CC) $(CFLAGS) -c $^ -o $@
@echo "CC \t$<"
# COMPDB recipe (looks at all compdbs)
$(BUILD)/compile_commands.json: $(COMPDBS)
@mkdir -p $(@D)
@printf "[\n" > $@
@sed -e '$$s/$$/,/' -s $(COMPDBS) | sed -e '$$s/,$$//' -e 's/^/ /' >> $@
@printf "]\n" >> $@
@for F in $(COMPDBS); \
do echo "COMPDB \t$$F"; done;
# JSON recipe (looks at C files)
$(BUILD)/%.json: $(SRC)/%.c
@mkdir -p $(@D)
@printf "\
{\n\
\"directory\": \"$(CURDIR)\",\n\
\"command\": \"$(CC) $(CFLAGS) -c $< -o $(basename $@).o\",\n\
\"file\": \"$<\"\n\
}\n" > $@
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