Vagrant / VirtualBox shared folders without vboxsf

I am working on a project that uses Vagrant (with a Linux guest) for a build environment. The build process relies on mmap()

for creating specific binaries for applications. Unfortunately, vboxsf

VirtualBox's mechanism for sharing directories with the host seems to have some (7-year) problems withmmap

.

I can get around this by working in guest private storage and then copying the files back to the shared directory, but this is ugly and slow.

For logistic reasons, I cannot use any other vagrant provider other than VirtualBox and cannot change the project to avoid using it mmap()

.

Does anyone know if there are other ways to share the directory with VirtualBox and if Vagrant can be configured to do this?