[CMake] Mixing up project language settings?

[Fedja Jeleskovic]

Hi there!

I am adding few components to the existing cmake driven C project, but new
components need C++ compiler instead. Top level CMakeLists.text starts with:
project (appName C)

The question is whether I need to change to top level settings and just
include CXX (or just remove C part since they are both defaulted anyway)
where my new components are, or the top level needs to be changed as well
to reflects what will be used below.

Thanks!
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