链接器输入文件未使用，因为未完成链接-gcc [英] linker input file unused because linking not done - gcc

问题描述

我是编写Makefile的初学者.我有一个类似这样的makefile:

I am a beginner in writing makefiles. I have a makefile something like this:

PATH1 = /ref

CC=gcc
LINK = gcc

INCLUDES = .
INCLUDES += -I/PATH1/inc \
        -I/$(PATH1)/abc/inc/ \
        -I/$(PATH1)/def/inc/ 


all: src_file

run: src_file

src_file: 
    $(CC) $(INCLUDES) -MM  /ref/abcd.c -o $@ 

clean:
    rm -f *.o src_file

如果我做一个make，我会得到错误:

If I do a make, I get the error:

linker input file unused because linking not done.

我在stackoverflow中读了一些类似的帖子，但找不到解决方案.有人可以让我知道我的makefile怎么了吗?预先感谢.

I read some similar posts in stackoverflow but couldn't get a solution. Could anybody please let me know what's wrong with my makefile? Thanks in advance.

推荐答案

罪魁祸首是预处理程序选项 -MM .来自 gcc预处理器选项，

The culprit is the preprocessor option -MM. From gcc pre-processor options,

-M

而不是输出预处理结果，而是输出一条适合于描述主要源文件依赖关系的规则.预处理器输出一个包含目标文件名的生成规则对于该源文件，冒号以及所有包含的名称文件，包括来自-include或-imacros命令行的文件选项.

Instead of outputting the result of preprocessing, output a rule suitable for make describing the dependencies of the main source file. The preprocessor outputs one make rule containing the object file name for that source file, a colon, and the names of all the included files, including those coming from -include or -imacros command line options.

将-M传递给驱动程序意味着-E，并使用隐含的-w禁止显示警告.

-MM

类似于-M，但不提及直接在系统头目录中找到的头文件，也不提及其中包含的头文件从这样的标题间接获取.

Like -M but do not mention header files that are found in system header directories, nor header files that are included, directly or indirectly, from such a header.

因此，您实际上只是进行预处理，因此无需编译，没有链接以及由此产生的错误.

So effectively you are just preprocessing and hence no compilation and no linking and the resultant error.

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