rstan dependent package compilation failures on CRAN

[sbfnk]

Summary:

Quite a few packages that depend on rstan currently error on some platforms during compilation on CRAN.

Description:

A few examples (the first ones when going through alphabetically) are

https://cran.r-project.org/web/checks/check_results_baggr.html
https://cran.r-project.org/web/checks/check_results_bakR.html
https://cran.r-project.org/web/checks/check_results_baldur.html

The final line in the log is

make[1]: *** [/home/hornik/tmp/R.check/r-patched-gcc/Work/build/etc/Makeconf:200: stanExports_logit.o] Terminated

No error is reported, and we have been unable to reproduce this locally using the same r-patched revision for EpiNow2. Perhaps a memory issue?

If this remains it is likely to cause issues for CRAN submission of packages that depend on rstan

[WardBrian]

Related: #1122
#1124 (comment)

I believe that these are most likely out-of-memory issues in the compiler (Terminated is distinct from an error and usually means the OS killed the process). If that's the case, it is unclear what we can do about it.

[sbfnk]

Seems to have been a transient issue that has resolved itself.