add `--preclean` to `R CMD SHLIB`

nimble-dev / nimble

The base NIMBLE package for R

http://R-nimble.org

BSD 3-Clause "New" or "Revised" License

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Closed paciorek closed 8 months ago

paciorek commented 8 months ago

This should clear out old files from previous compilation and address the apparent time stamp issue in R CMD SHLIB's use of make.

Fixes #1368