[CMake] Build a program and get its output during "cmake" run

[Yaron Cohen-Tal]

Hi,

I'd like to build a C++ program and get its output during "cmake" run, not
during the project build. "CHECK_CXX_SOURCE_RUNS" only gives me the exit
code, but I need the output from the program. Anyway to do it?

Thanx,
Yaron
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