Problem using Cotire with Xcode10 New Build System

[robneval]

Cotire 1.8.0
CMake 3.12.2
Xcode 10.1 (on Mojave)

Getting problems like this:
error: Build input file cannot be found: '<path>/package_name/Debug/cotire/package_name_template_CXX_unity_1_1.cxx'

Looked and the file exists...

Works normally when selecting Legacy Build System in project settings

Target setup according to: https://github.com/sakra/cotire/blob/master/MANUAL.md#changing-the-name-of-the-generated-unity-build-target

[gjasny]

Latest CMake enforces old buildsystem for the Xcode generator because the new buildsystem lacks features that CMake depends upon.