GNU在包含其他makefile时做出正确的行为

时间:2018-12-01 10:56:57

标签: makefile gnu-make

我在项目的根目录中有以下makefile:

Makefile

const classes = new Set();
class A {
  constructor() {
    classes.add(this.constructor);
  }
}

class B extends A {

}

class C extends A {

}

class D extends C {

}
new B();
new B();
new C();
new D();
console.log([...classes]);

包含pi / 3 / mod.mk

# Board version
# Available: 3
PI              ?= 3

# Kernel binaries
ifeq ($(PI), 3)
KERNEL_IMG      := kernel8.img
else ifeq ($(PI), 2)
KERNEL_IMG      := kernel7.img
else ifeq ($(PI), 1)
KERNEL_IMG      := kernel.img
else
$(error Unsupported Raspberry Pi version)
endif

KERNEL_ELF      := $(patsubst %.img,%.elf,$(KERNEL_IMG))

# Directories/paths
BUILD_DIR       := build

# Toolchain
TOOLCHAIN       ?= aarch64-elf
OBJCOPY         := $(TOOLCHAIN)-objcopy
LD              := $(TOOLCHAIN)-ld
CC              := $(TOOLCHAIN)-gcc

# Misc
LINKER_SCRIPT   := linker.ld

# Flags
LDFLAGS         := -T $(LINKER_SCRIPT)
ASFLAGS         :=
CFLAGS          :=

# Source files
C_SRC           := $(wildcard *.c)
ASM_SRC         := $(wildcard *.S)

# Include
include pi/$(PI)/mod.mk

# Object files
OBJECTS         := $(patsubst %,$(BUILD_DIR)/%.o,$(C_SRC))
OBJECTS         += $(patsubst %,$(BUILD_DIR)/%.o,$(ASM_SRC))

# Targets
.PHONY: all builddirs clean
all: $(BUILD_DIR)/$(KERNEL_IMG)

$(BUILD_DIR)/$(KERNEL_IMG): $(BUILD_DIR)/$(KERNEL_ELF)
        $(OBJCOPY) $< -O binary $@

$(BUILD_DIR)/$(KERNEL_ELF): $(LINKER_SCRIPT) $(OBJECTS)
        $(LD) $(OBJECTS) $(LDFLAGS) -o $@

$(OBJECTS): | builddirs

builddirs: $(BUILD_DIR)/pi/$(PI)

$(BUILD_DIR)/pi/$(PI):
        mkdir -p $@

$(BUILD_DIR)/%.S.o: %.S
        $(CC) -c $< $(ASFLAGS) -o $@

$(BUILD_DIR)/%.c.o: %.c
        $(CC) -c $< $(CFLAGS) -o $@

clean:
        $(RM) -r $(BUILD_DIR)

现在是问题所在:每当我在项目的根目录中运行“ make”时,都会调用“ $(BUILD_DIR)/pi/3/start.S.o”规则,而不是“ all”。如果我将'include pi / $(PI)/mod.mk'移至根makefile的最底部,并将'pi / 3 / mod.mk'中的'C_SRC'和'ASM_SRC'变量替换为'OBJECTS + = $(BUILD_DIR)/pi/3/start.So'并调用'make',甚至没有调用此规则,所以我得到一个错误,表明make不知道如何构建开始。所以

我做错了什么,最好的解决方法是什么?

1 个答案:

答案 0 :(得分:0)

Make的默认目标是Makefile中的第一个目标。在您的情况下,第一个目标是包含的Makefile中定义的目标:$(BUILD_DIR)/pi/3/start.S.o。要么调用make all或在Makefile中移动all规则,使其成为第一个规则,要么告诉make默认目标是all

.DEFAULT_GOAL := all

(请参阅GNU make manual)。