Weird variable behaviour with find_package

[ben.boeckel (Ben Boeckel (Kitware))]

@LaXiS

It still is not clear to me, the closest thing I found was the ONEAPI_ROOT environment variable, but I believe that would only work for find_package(ONEAPI). Not even an entry in the Windows registry. Is there any debug/trace switch that logs the searched directories? Anyway, it’s not a big deal.

CMake 3.19+ has --debug-find which should help out with this.

@LaXiS

ipp-config.cmake explicitly says in its header (full paste here):

Thanks. The problem is that list(APPEND) is in a function. This means that modifications don’t escape the function scope. I recommend filing an issue with IPP upstream to fix this problem.