[CMake] How to specify target specific CPPFLAGS or CFLAGS?

[Clark J. Wang]

I have a C source file `foo.c' and I want to produce 2 executables like
this:

$ gcc -DFLAG_1 -o foo_1 foo.c
$ gcc -DFLAG_2 -o foo_2 foo.c

How should I write the CMake rules?

Thanks.
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