check xcode developer tools package absence

[mangup]

How to understand phrase
" At least Xcode 9.3 from developer.apple.com/xcode. (Note: Installing the developer tools package is not needed, and building with that package is not supported) "
from macOSCompile manual?
- Xcode is installed. How to check is "developer tools package" installed or not?

[dfuhrmann]

The following command should show Xcode.app in its path, instead of any developer tools package. Then, everything should be ok.

$ xcode-select -p
/Applications/Xcode.app/Contents/Developer