141 lines
3.3 KiB
Makefile
141 lines
3.3 KiB
Makefile
# Nuke built-in rules.
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.SUFFIXES:
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override OUTPUT := os
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# User controllable toolchain and toolchain prefix.
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TOOLCHAIN :=
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TOOLCHAIN_PREFIX :=
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ifneq ($(TOOLCHAIN),)
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ifeq ($(TOOLCHAIN_PREFIX),)
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TOOLCHAIN_PREFIX := $(TOOLCHAIN)-
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endif
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endif
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# User controllable C compiler command.
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ifneq ($(TOOLCHAIN_PREFIX),)
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CC := $(TOOLCHAIN_PREFIX)gcc
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else
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CC := cc
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endif
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# User controllable linker command.
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LD := $(TOOLCHAIN_PREFIX)ld
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# Defaults overrides for variables if using "llvm" as toolchain.
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ifeq ($(TOOLCHAIN),llvm)
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CC := clang
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LD := ld.lld
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endif
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# User controllable C flags.
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CFLAGS := -g -O2 -pipe -Iinclude
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# User controllable C preprocessor flags. We set none by default.
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CPPFLAGS :=
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# User controllable nasm flags.
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NASMFLAGS := -g
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# User controllable linker flags. We set none by default.
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LDFLAGS :=
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# Check if CC is Clang.
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override CC_IS_CLANG := $(shell ! $(CC) --version 2>/dev/null | grep -q '^Target: '; echo $$?)
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# If the C compiler is Clang, set the target as needed.
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ifeq ($(CC_IS_CLANG),1)
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override CC += \
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-target x86_64-unknown-none-elf
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endif
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# Internal C flags that should not be changed by the user.
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override CFLAGS += \
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-Wall \
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-Wextra \
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-std=gnu11 \
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-ffreestanding \
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-fno-stack-protector \
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-fno-stack-check \
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-fno-lto \
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-fno-PIC \
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-ffunction-sections \
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-fdata-sections \
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-m64 \
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-march=x86-64 \
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-mabi=sysv \
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-mno-80387 \
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-mno-mmx \
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-mno-sse \
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-mno-sse2 \
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-mno-red-zone \
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-mcmodel=kernel
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# Internal C preprocessor flags that should not be changed by the user.
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override CPPFLAGS := \
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-I src \
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$(CPPFLAGS) \
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-MMD \
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-MP
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# Internal nasm flags that should not be changed by the user.
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override NASMFLAGS := \
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-f elf64 \
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$(patsubst -g,-g -F dwarf,$(NASMFLAGS)) \
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-Wall
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# Internal linker flags that should not be changed by the user.
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override LDFLAGS += \
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-m elf_x86_64 \
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-nostdlib \
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-static \
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-z max-page-size=0x1000 \
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--gc-sections \
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-T linker.ld
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# Use "find" to glob all *.c, *.S, and *.asm files in the tree and obtain the
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# object and header dependency file names.
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override SRCFILES := $(shell find -L src -type f 2>/dev/null | LC_ALL=C sort)
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override CFILES := $(filter %.c,$(SRCFILES))
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override ASFILES := $(filter %.S,$(SRCFILES))
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override NASMFILES := $(filter %.asm,$(SRCFILES))
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override OBJ := $(addprefix obj/,$(CFILES:.c=.c.o) $(ASFILES:.S=.S.o) $(NASMFILES:.asm=.asm.o))
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override HEADER_DEPS := $(addprefix obj/,$(CFILES:.c=.c.d) $(ASFILES:.S=.S.d))
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# Default target. This must come first, before header dependencies.
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.PHONY: all
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all: bin/$(OUTPUT)
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sh limine.sh
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sh run.sh
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# Include header dependencies.
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-include $(HEADER_DEPS)
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# Link rules for the final executable.
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bin/$(OUTPUT): linker.ld $(OBJ)
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mkdir -p "$(dir $@)"
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$(LD) $(LDFLAGS) $(OBJ) -o $@
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# Compilation rules for *.c files.
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obj/%.c.o: %.c Makefile
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mkdir -p "$(dir $@)"
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$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
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# Compilation rules for *.S files.
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obj/%.S.o: %.S Makefile
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mkdir -p "$(dir $@)"
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$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
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# Compilation rules for *.asm (nasm) files.
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obj/%.asm.o: %.asm Makefile
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mkdir -p "$(dir $@)"
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nasm $(NASMFLAGS) $< -o $@
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usb: all
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sudo dd if=image.hdd of=/dev/sda bs=4M oflag=sync status=progress
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# Remove object files and the final executable.
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.PHONY: clean
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clean:
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rm -rf bin obj
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