make the project to use cxx as well

[ymkim92]

I got this error when I tried to build the example:

embedded-cli/build$ cmake ..
-- The C compiler identification is GNU 11.4.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Found PythonInterp: /usr/bin/python3 (found suitable version "3.10.12", minimum required is "3.0") 
Enable extra flags for GNU
-- Configuring done
CMake Error: Cannot determine link language for target "embedded_cli_linux".
CMake Error: CMake can not determine linker language for target: embedded_cli_linux
-- Generating done
CMake Generate step failed.  Build files cannot be regenerated correctly.

The example's source code is cpp file. I think it needs "CXX" as well in the project definition.

I am curious why no one complained about this yet...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a345459) 81.68% compared to head (d2aea28) 81.68%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #43   +/-   ##
=======================================
  Coverage   81.68%   81.68%           
=======================================
  Files           2        2           
  Lines         535      535           
  Branches      130      130           
=======================================
  Hits          437      437           
  Misses         64       64           
  Partials       34       34           

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[funbiscuit]

I can't merge your suggestion since lib itself doesn't require C++ while you enable it globally. The reason noone noticed it is probably because c++ was enabled when cmake was run with -DBUILD_TESTS=true. And in CI (where examples are built), tests are also built so there was no error.

I've pushed into master fix to enable C++ also while building examples.