[CMake] How to skip checking compiler detection??

[sheissj]

Hello.

I want to generate a simple Makefile from cmake.
This Makefile looks like this:

all:
    @echo "No build"

tags:
    ctags -R *.cpp
    cscope -b -q -k *.cpp


This simple Makefile do not have target to build source code. It is only for
building ctags index and cscope db.
So it is not a matter whether c/c++ compiler exists or not.

How can I write CMakeList.txt for this simple work?

One problem is... when "cmake ." command is run, some errors are occured
like "The C compiler identification is unknown" and "The C++ compiler
identification is unknown" and blar blar because I use cygwin and gcc/g++ is
not installed.
How to skip checking compiler detection?

Please help me.
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