127 lines
3.3 KiB
Makefile
127 lines
3.3 KiB
Makefile
# Nuke built-in rules and variables.
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override MAKEFLAGS += -rR
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# This is the name that our final kernel executable will have.
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# Change as needed.
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override KERNEL := kernel.elf
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# Convenience macro to reliably declare user overridable variables.
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define DEFAULT_VAR =
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ifeq ($(origin $1),default)
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override $(1) := $(2)
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endif
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ifeq ($(origin $1),undefined)
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override $(1) := $(2)
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endif
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endef
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# It is highly recommended to use a custom built cross toolchain to build a kernel.
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# We are only using "cc" as a placeholder here. It may work by using
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# the host system's toolchain, but this is not guaranteed.
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override DEFAULT_CC := cc
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$(eval $(call DEFAULT_VAR,CC,$(DEFAULT_CC)))
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# Same thing for "ld" (the linker).
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override DEFAULT_LD := ld
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$(eval $(call DEFAULT_VAR,LD,$(DEFAULT_LD)))
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# User controllable C flags.
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override DEFAULT_CFLAGS := -g -O2 -pipe
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$(eval $(call DEFAULT_VAR,CFLAGS,$(DEFAULT_CFLAGS)))
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# User controllable C preprocessor flags. We set none by default.
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override DEFAULT_CPPFLAGS :=
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$(eval $(call DEFAULT_VAR,CPPFLAGS,$(DEFAULT_CPPFLAGS)))
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# User controllable nasm flags.
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override DEFAULT_NASMFLAGS := -F dwarf -g
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$(eval $(call DEFAULT_VAR,NASMFLAGS,$(DEFAULT_NASMFLAGS)))
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# User controllable linker flags. We set none by default.
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override DEFAULT_LDFLAGS :=
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$(eval $(call DEFAULT_VAR,LDFLAGS,$(DEFAULT_LDFLAGS)))
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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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-fPIE \
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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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# Internal C preprocessor flags that should not be changed by the user.
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override CPPFLAGS := \
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-I. \
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$(CPPFLAGS) \
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-MMD \
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-MP
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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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-pie \
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--no-dynamic-linker \
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-z text \
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-z max-page-size=0x1000 \
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-T linker.ld
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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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-Wall \
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-f elf64
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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 CFILES := $(shell find -L . -type f -name '*.c')
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override ASFILES := $(shell find -L . -type f -name '*.S')
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override NASMFILES := $(shell find -L . -type f -name '*.asm')
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override OBJ := $(CFILES:.c=.c.o) $(ASFILES:.S=.S.o) $(NASMFILES:.asm=.asm.o)
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override HEADER_DEPS := $(CFILES:.c=.c.d) $(ASFILES:.S=.S.d)
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# Default target.
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.PHONY: all
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all: $(KERNEL)
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limine.h:
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curl -Lo $@ https://github.com/limine-bootloader/limine/raw/trunk/limine.h
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# Link rules for the final kernel executable.
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$(KERNEL): $(OBJ)
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$(LD) $(OBJ) $(LDFLAGS) -o $@
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# Include header dependencies.
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-include $(HEADER_DEPS)
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# Compilation rules for *.c files.
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%.c.o: %.c limine.h
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$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
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# Compilation rules for *.S files.
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%.S.o: %.S limine.h
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$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
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# Compilation rules for *.asm (nasm) files.
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%.asm.o: %.asm
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nasm $(NASMFLAGS) $< -o $@
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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 $(KERNEL) $(OBJ) $(HEADER_DEPS)
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.PHONY: distclean
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distclean: clean
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rm -f limine.h
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