嘿家伙我在这里有一个小问题。我想为我的新树莓派开发一个小内核,并使用此课程:http://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/os/ 了解它。那么当我从这个网站上下载一个具有多个源文件的例子时,它会正确编译第一个,然后告诉我以下内容:make *没有规则来构建目标'build /','build/gpio.o' 。停止。ARM GNU Makefile文件夹依赖关系时间戳问题
让我解释一下。有一个包含所有源文件的文件夹源。在makefile中,这些文件被编译为build文件夹中的.o文件,但编译汇编文件时,build文件夹也被设置为依赖项。因此,当第一个文件被编译并且生成了build文件夹时,文件夹时间戳已经过时,第二个编译文件不能使用这个目录作为依赖关系....这是要解决的问题,但我不知道如何....
这里的makefile文件:)
ARMGNU ?= arm-none-eabi
# The intermediate directory for compiled object files.
BUILD = build/
# The directory in which source files are stored.
SOURCE = source/
# The name of the output file to generate.
TARGET = kernel.img
# The name of the assembler listing file to generate.
LIST = kernel.list
# The name of the map file to generate.
MAP = kernel.map
# The name of the linker script to use.
LINKER = kernel.ld
# The names of all object files that must be generated. Deduced from the
# assembly code files in source.
OBJECTS := $(patsubst $(SOURCE)%.s,$(BUILD)%.o,$(wildcard $(SOURCE)*.s))
# Rule to make everything.
all: $(TARGET) $(LIST)
# Rule to remake everything. Does not include clean.
rebuild: all
# Rule to make the listing file.
$(LIST) : $(BUILD)output.elf
$(ARMGNU)-objdump -d $(BUILD)output.elf > $(LIST)
# Rule to make the image file.
$(TARGET) : $(BUILD)output.elf
$(ARMGNU)-objcopy $(BUILD)output.elf -O binary $(TARGET)
# Rule to make the elf file.
$(BUILD)output.elf : $(OBJECTS) $(LINKER)
$(ARMGNU)-ld --no-undefined $(OBJECTS) -Map $(MAP) -o $(BUILD)output.elf -T $(LINKER)
# Rule to make the object files.
$(BUILD)%.o: $(SOURCE)%.s $(BUILD)
$(ARMGNU)-as -I $(SOURCE) $< -o [email protected]
$(BUILD):
mkdir [email protected]
# Rule to clean files.
clean :
-rm -rf $(BUILD)
-rm -f $(TARGET)
-rm -f $(LIST)
-rm -f $(MAP)
PS ::
YEEAAYY我有it.Are在这个例子中,页面工作,对天,但现在:) 再看看: OBJDIR:= objdir OBJS:= $(addprefix $(OBJDIR)/,foo.o bar.o baz.o)
$(OBJDIR)/%.o : %.c
$(COMPILE.c) $(OUTPUT_OPTION) $<
all: $(OBJS)
$(OBJS): | $(OBJDIR)
$(OBJDIR):
mkdir $(OBJDIR)`
我刚刚删除的$(BUILD)文件夹的依赖性和目标,并写道:
$(OBJECTS): | $(BUILD)
所以现在的作品完美这里的几行,我改变:
$(BUILD)%.o: $(SOURCE)%.s
$(ARMGNU)-as -I $(SOURCE) $< -o [email protected]
$(OBJECTS): | $(BUILD)
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