how to modify the number of parallel compilation with Xcode

Question

How to change the number of parallel compilations when building a C++ project with XCode ?

I am not talking about distributed builds, but on simultaneous compilations of

Answer 1

Adjust the PBXNumberOfParallelBuildSubtasks user default, for example:

defaults write com.apple.XCode PBXNumberOfParallelBuildSubtasks 6