I've had a lot of success bringing C++ dependencies under SPM management. It's created a package based import mechanism without storing binaries anywhere, and it's a quick and easy process for smaller dependencies.
But the tests are one thing I haven't been able to bring with me to SPM. GTest is the defecto testing framework for C++, and I haven't seen a way to invoke it from a test target. And until C++ compatibility lands in Swift, there's no way to exercise the C++ (easily) from XCTest.
I also poked around and it looks like there were some stories about third party test framework support many years ago, and these were closed.
Am I correct in thinking there is no clear way to test C++, in a cross platform way, from SPM? And no way to integrate GTest?
Does Obj-C++ function on other platforms like Linux? My impression was that Swift's XCTest didn't support Obj-C/Obj-C++ on other platforms. And that Obj-C required Obj-C Foundation, which is only included on Apple platforms.
One solution might be to write a bridge for GTest to XCTest using C. I know there are Obj-C++ based bridges out there for Xcode. It could be exportable as a Swift Package that also handles the building of GTest.
My recollection of the Obj-C GTest bridge is that it used a lot of dynamism and NSInvocation, but it looks like the Swift.org version of XCTest can do dynamic test case generation, just using different means.
