.dynLibs() is wiped out, probably in a finalizer

[gaborcsardi]

See this minimal package: https://github.com/gaborcsardi/empty

wipe.R has:

.dynLibs()
pkgload::load_all()
.dynLibs()
gc()
.dynLibs()
pkgload::load_all()
.dynLibs()
gc()
.dynLibs()

If you run this, notice how the last .dynLibs() is an empty list:

❯ R --vanilla -q -f wipe.R
> .dynLibs()
                                                                                          Filename
1     /Library/Frameworks/R.framework/Versions/4.1-arm64/Resources/library/methods/libs/methods.so
2         /Library/Frameworks/R.framework/Versions/4.1-arm64/Resources/library/utils/libs/utils.so
3 /Library/Frameworks/R.framework/Versions/4.1-arm64/Resources/library/grDevices/libs/grDevices.so
4   /Library/Frameworks/R.framework/Versions/4.1-arm64/Resources/library/graphics/libs/graphics.so
5         /Library/Frameworks/R.framework/Versions/4.1-arm64/Resources/library/stats/libs/stats.so
  Dynamic.Lookup
1          FALSE
2          FALSE
3          FALSE
4          FALSE
5          FALSE

[...]

> gc()
         used (Mb) gc trigger (Mb) limit (Mb) max used (Mb)
Ncells 518020 27.7     943277 50.4         NA   943277 50.4
Vcells 908323  7.0    8388608 64.0      16384  1824252 14.0
> .dynLibs()
>

Session info:

❯ sessioninfo::session_info(pkgs="pkgload")
─ Session info  ✍️  🇧🇳  😙   ─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
 hash: writing hand, flag: Brunei, kissing face with smiling eyes

 setting  value
 version  R version 4.1.2 (2021-11-01)
 os       macOS Monterey 12.0.1
 system   aarch64, darwin20
 ui       X11
 language (EN)
 collate  en_US.UTF-8
 ctype    en_US.UTF-8
 tz       Europe/Madrid
 date     2021-11-17
 pandoc   2.16.1 @ /opt/homebrew/bin/pandoc

─ Packages ──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
 package    * version    date (UTC) lib source
 cli          3.1.0      2021-10-27 [1] CRAN (R 4.1.1)
 crayon       1.4.2      2021-10-29 [1] CRAN (R 4.1.1)
 desc         1.4.0      2021-09-28 [1] CRAN (R 4.1.1)
 glue         1.5.0      2021-11-07 [1] CRAN (R 4.1.1)
 pkgload      1.2.3.9000 2021-11-17 [1] local
 R6           2.5.1      2021-08-19 [1] CRAN (R 4.1.1)
 rlang        0.4.12     2021-10-18 [1] CRAN (R 4.1.1)
 rprojroot    2.0.2      2020-11-15 [1] CRAN (R 4.1.0)
 rstudioapi   0.13       2020-11-12 [1] CRAN (R 4.1.0)
 withr        2.4.2      2021-04-18 [1] CRAN (R 4.1.1)

 [1] /Users/gaborcsardi/Library/R/arm64/4.1/library
 [2] /Library/Frameworks/R.framework/Versions/4.1-arm64/Resources/library