<span>Is possible to enable C++14 only for project?
Now, I changing line dd_cxx_compile_options(-std=gnu++1y -fno-rtti) in idf_functions.cmake, but project is not portable.</span>
Please double-check with Espressif (the vendor for ESP-IDF) whether there is an officially supported and stable way to do this. If yes, we will be happy to add a GUI setting for it.