Shared library build cannot be enabled via nanobind_add_module

[Martinfx]

Hi,

I'm trying to build nanobind in a FreeBSD ports environment and I noticed that enabling a shared build for the internal nanobind library is not possible via any documented CMake option or cache variable.

There is no way to enable a shared build of the internal nanobind library from outside the function (e.g. via CMAKE_ARGS or find_package configuration).

[wjakob]

Many people make shared builds via the NB_SHARED argument (please read the build system part of the docs if that isn't clear). Are you saying that there is something particular about FreeBSD here?

[Martinfx]

Hi, thank you.
I read the documentation, but I can't seem to enable NB_SHARED. -DNB_SHARED=1 is ignored.

[hpkfft]

There is no way to enable a shared build of the internal nanobind library using a CMake variable.
NB_SHARED is an argument passed to nanobind's CMake high-level interface.
The library libnanobind.so is built along with the module extension itself. It's small (as the name "nanobind" suggests); it's under 180K on my system.