72 lines
1.7 KiB
Makefile
72 lines
1.7 KiB
Makefile
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BIN_DIR=bin
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BUILD_DIR=build
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SRC_DIR=src
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KERNEL := sen.elf
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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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ifeq ($(origin CC), default)
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CC := cc
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endif
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# Likewise, "ld" here is just a placeholder and your mileage may vary if using the
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# host's "ld".
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ifeq ($(origin LD), default)
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LD := ld
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endif
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CFLAGS ?= -O2 -g -Wall -Wextra -pipe -fno-pie -no-pie
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LDFLAGS ?=
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# Internal C flags that should not be changed by the user.
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INTERNALCFLAGS := \
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-I$(SRC_DIR) \
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-std=gnu11 \
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-ffreestanding \
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-fno-stack-protector \
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-no-pie \
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-mabi=sysv \
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-mno-80387 \
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-mno-mmx \
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-mno-3dnow \
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-mno-sse \
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-mno-sse2 \
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-mno-red-zone \
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-mcmodel=kernel \
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-MMD
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# Internal linker flags that should not be changed by the user.
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INTERNALLDFLAGS := \
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-T$(SRC_DIR)/linker.ld \
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-nostdlib \
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-zmax-page-size=0x1000 \
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-static
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CFILES := $(wildcard $(SRC_DIR)/*.c)
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OBJ := $(BUILD_DIR)/$(notdir $(CFILES:.c=.o))
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HEADER_DEPS := $(BUILD_DIR)/$(notdir $(CFILES:.c=.d))
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.PHONY: all
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all: $(KERNEL)
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$(KERNEL): $(OBJ) | $(BIN_DIR)
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$(LD) $(OBJ) $(LDFLAGS) $(INTERNALLDFLAGS) -o $(BIN_DIR)/$@
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-include $(HEADER_DEPS)
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$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c | $(BUILD_DIR)
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$(CC) $(CFLAGS) $(INTERNALCFLAGS) -c $< -o $@
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# create directories if they don't exist
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$(BIN_DIR):
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mkdir -p $@
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$(BUILD_DIR):
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mkdir -p $@
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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 $(BIN_DIR)/$(KERNEL) $(OBJ) $(HEADER_DEPS)
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