如何避免“没有这样的文件或目录”错误的`make clean` Makefile目标

Question

I have a Makefile that defines a .PHONY clean target for cleaning up .o files and executables, that target looks like:

...
.PHONY : clean
clean:
    rm $(addprefix $(vq_DIR),$(vq_OBJS)) \
       $(addprefix $(vq_DIR),vq) \
       $(addprefix $(covq_DIR),$(covq_OBJS)) \
       $(addprefix $(covq_DIR),covq) \
       $(addprefix $(covq_2_DIR),$(covq_2_OBJS)) \
       $(addprefix $(covq_2_DIR),covq_2) \
       $(addprefix $(covq_2_DIR),$(test_OBJS)) \
       $(addprefix $(covq_2_DIR),test)

Everything works as it should, but when some of these files do not exist, rm raises an Error (No such file or directory), and the output says that the Makefile target failed, when it clearly did what I wanted.

Is there a good way to basically tell the rm command to "remove these files if they exist, and don't complain if they don't"? I looked up the manpage for rm , and found no such flag.

Edit: I actually didn't notice the description of the -f flag in the manpage, this is the solution.

Answer 1

使用rm -f （甚至更好的$(RM) ，由内置的make规则提供，可以使用make -p ）而不是rm在你的clean规则中找到。

Answer 2

rm -f

will FORCE and not output any error

Answer 3

When Targets Fail

When a target is executed, it returns a status based on whether or not it was successful--if a target fails, then make will not execute any targets that depend on it. For instance, in the above example, if "clean" fails, then rebuild will not execute the "build" target. Unfortunately, this might happen if there is no core file to remove. Fortunately, this problem can be solved easily enough by including a minus sign in front of the command whose status should be ignored:

 clean: -rm -f *.o core 

~ http://www.cprogramming.com/tutorial/makefiles.html

Answer 4

I've given up with rm. The following command will remove files and dirs.

find . -delete

To remove only files or only dirs, there is the -type option:

# remove only files
find . -type f -delete


# remove only dirs
find . -type d -delete

Actually, I've create a little script (based on that snippet) named bomb that removes files without complaining: https://github.com/lingtalfi/bomb

Answer 5

Late to the party, but here's another solution that worked with our quirky build environment:

if exist *.exe rm -f *.exe

Not output free, but reduced and exits cleanly:

# make clean
        if exist *.exe rm -f *.exe

I tried a lot of alternatives that all had issues before settling on this one.