[CMake] One source file, different arch

[邓尧]

Hi,

I'm new to CMake. My project is a little different from the projects found
in the tutorials. I have to compile some of the source files into two
different archs(32-bit & 64-bit). It's like the following:
  Given 4 source files: A.c, B.c, C.c, D.c, I need to compile a 32-bit
executable with source file A.c, B.c and C.c, I also need to compile a
64-bit executable with source file A.c B.c and D.c.
How to write the CMake script in this situation?

Thanks

-Yao
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