[Feature Request] Provide the minimal disk space requirement for CMake testing.

[hyoklee]

Is your feature request related to a problem? Please describe. make test failed when the available storage is 1.6G.

Describe the solution you'd like Provide a documentation on how much space is required.

Describe alternatives you've considered It would be nice if 'make test' can skip some tests if they require space beyond what's available.

Additional context I think this will be useful for small VMs and embedded system.

[hyoklee]

It seems that 4G is required.

[derobins]

The amount of disk space used is because CMake creates statically linked test programs. CMake should not do this when we're also building the shared library.