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PCL was already defaulted to OFF on Linux, this changes the default to OFF on MSVC as well. This can be reverted once the primary LibPack for Windows includes a version of FLANN that compiles under C++17 (the last official release of FLANN, 1.9.1, does not, but the HEAD in their Git repository does).
This folder will contain an individual cmake file for each FreeCAD "helper".
A "helper" should be a macro or function that tries (as much as possible) to adhere to the UNIX philosophy - in other words, it should strive to do one thing and do it well.
The idea here is to break up the cmake build system into smaller, more manageable chunks. This should make maintenance easier, and should also make troubleshooting a bit less painful. Finally, it should also clean up our top-level CMakeLists.txt file a bit, making it bit easier for new developers to jump in and see what's what.
NOTE: CMake has a very distinct difference between its macros and its functions. Namely, a function creates its own SCOPE, whereas a macro essentially executes in the calling scope. There are also some specifics of how arguments are managed.
In general:
- If you use a macro, be careful modifying arguments - you may get surprises.
- If you use a function, make sure to use set(.... PARENT_SCOPE) for variables that should be available outside of the function.