Tips of CMake toolchain files for Renesas CC-RX/CC-RL/CC-RH compilers. It also makes LLVM clangd language server and Microsoft VSCode working better with them, moreover Microsoft IntelliSense and Visual Studio with them. Related link: Renesas CC-RX compiler's tips for CMake with IoT SDKs of AWS and Microsoft Azure https://github.com/NoMaY-jp/Renesas_CC_compilers_tips_for_CMake_with_IoT_SDKs