[CMake] No debugging symbols found when using -DCMAKE_BUILD_TYPE=Debug

[Chuck Atkins]

>
>    [eschnigma at manjaro build]$ cmake .. -DCMAKE_BUILD_TYPE:STRING="Debug"
> -- The C compiler identification is unknown
> -- The CXX compiler identification is unknown
>

This is definitely the reason for no debug symbols.  If the compiler is
unknown then CMake won't know the right flags to pass to generate debug
info.  The more important question though is why the compiler can't be
identified.  What compiler is being used?  Can check with /usr/bin/c++
--version ?
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