Warn about incorrect include paths in the compile command's file

For my extension, I'm creating a better Backup Intellisense that parses the compile commands for includePaths which also lets you convert it to exclusive includePath Intellisense.

Doing so shows 88 include paths, in the compile commands file, that were incorrect. They must be not that important since Intellisense still worked.

Would this be considered a bug(or feature request) that the cpptools extension doesn't warn about incorrect include paths in the compile command's file?

Originally posted by @boocs in https://github.com/microsoft/vscode-cpptools/issues/6358#issuecomment-761285903

報告された不正な include パスを含むコンパイルコマンドファイルから始め、その拡張機能がそれらのパスをどのように使用しているかを確認します。無効なパスをどのように識別すべきか、またユーザー向けの警告をどこに表示すべきかを判断します。誤った include パスによって、動作している IntelliSense を妨げることなく、明確な警告が確実に生成されれば完了です。