Install system for UnitTest++

Another (potentially easier) solution would be to put the unittest++ source in a subdirectory of a common test helpers directory in Source and then just build the unittest++ library as part of the standard build in the architecture specific build directory.

Something like:

Source

— System — …. — UnitTestSupport? (Everything unit test support related under here)

— UnitTest++ (Vendor branch of UnitTest++) — OpenSG (OpenSG specific helpers)

This may seem a little heavy weight, but UnitTest++ is not that large and it has a number of good advantages. - We can rely upon having the expected version of unittest++ available - We can (statically) link against UnitTest++ easily - The build is simplified because we know how the test libs will be compiled - Multi-arch/compiler/etc is supported out of the box because it is part of the standard build.

Aside from the initial cost of compiling the unittest library there are not any downsides that I see. And that cost is fairly insignificant compared to the time to compile OpenSG proper.

That should have looked like:

Source
  — System 
  — ... 
  — UnitTestSupport (Everything unit test support related under here)
     — UnitTest++   (Vendor branch of UnitTest++) 
     — OpenSG       (OpenSG specific helpers)