math/R: Is LIBR really needed?

[Joseph Mingrone]

[quoted with Yuri's permission]
Yuri <yuri at freebsd.org> writes:
> Setting LIBR=off causes lib/R/lib/libR.so to disappear. This makes it
> difficult for ports depending on math/R (like RStudio) to set port
> dependencies.  Is it really important to have the ability to use only
> the static library? In case it isn't important, maybe you could delete
> LIBR?

I think it could be OK to remove the option and always build the shared
library.

Some potential concerns:

- This is not upstream's default.
- Upstream warns of possible performance penalties [1,2].
- Users currently without the shared library will have to reinstall R
  packages the next time they update math/R.

[1] https://cran.r-project.org/doc/manuals/r-release/R-admin.html#Configuration-options
[2] https://cran.r-project.org/doc/manuals/r-release/R-admin.html#DOCF57

Joseph
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