[Rd] R-devel CMD build fails when vignette present

[Martin Morgan]

If I try to build a package with a vignette

  R CMD build Biobase

I see

* checking for file 'Biobase/DESCRIPTION' ... OK
* preparing 'Biobase':
* checking DESCRIPTION meta-information ... OK
* cleaning src
* installing the package to re-build vignettes
* creating vignettes ... OK
* cleaning src
Error in setwd(pkgname) : cannot change working directory
Execution halted

This is because prepare_pkg invoked at tools/R/build.R:605 changes the
directory (e.g., from /tmp/RtmprGGHhU/Rbuild257d6d93 to
/tmp/RtmprGGHhU/Rbuild257d6d93/Biobase), in turn because the on.exit at
build.R:223 is usurped by on.exit at build.R:256/259.

Martin
-- 
Computational Biology
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