[R-package] [ci] gcc14 test jobs failing: "libRlapack.so: undefined symbol: dgemmtr_"

[jameslamb]

Description

gcc14 CI jobs for the R package are all failing, like this:

During startup - Warning message:
package ‘stats’ in options("defaultPackages") was not found 
Error in dyn.load(file, DLLpath = DLLpath, ...) : 
  unable to load shared object '/opt/R/devel-gcc14/lib/R/library/stats/libs/stats.so':
  /opt/R/devel-gcc14/lib/R/lib/libRlapack.so: undefined symbol: dgemmtr_
Calls: <Anonymous> ... asNamespace -> loadNamespace -> library.dynam -> dyn.load
Execution halted
ERROR: lazy loading failed for package ‘Matrix’
...
In install.packages(pkgs = deps_to_install, dependencies = c("Depends",  :
  installation of 6 packages failed:
  ‘xfun’, ‘data.table’, ‘Matrix’, ‘highr’, ‘markdown’, ‘knitr’
...
Error in loadVignetteBuilder(pkgdir, TRUE) : 
  vignette builder 'knitr' not found

Reproducible example

See the gcc14 R-package CI job on any recent build of LightGBM.

Example from #6852: https://github.com/microsoft/LightGBM/actions/runs/13703413518/job/38323189297?pr=6852

Environment info

N/A

Additional Comments

[jameslamb]

Noting that this looks like it's coming from R itself. There were some recent changes in R-devel related to LAPACK (https://github.com/wch/r-source/commits/trunk/)

This one updating to LAPACK 3.12.1 looks relevant:

wch/r-source@ed13d39

It has this in the vendored LAPACK's README:

dgemmtr and zgemmtr were added for LAPACK 3.12.1 in R 4.5.0.

There is also this one that added dgemmtr_ to RBlas.def (although I think .def files should only affect Windows?):

wch/r-source@d21a7cf

[jameslamb]

I only found one other reference to this problem on GitHub, but don't see any other clues there: furrer-lab/r-containers#50 (comment)

[jameslamb]

I just manually re-reran the gcc14 R package CI job on #6852 (https://github.com/microsoft/LightGBM/actions/runs/13703413518/job/38457952135?pr=6852), and saw it pass.

So I suspect that this was something temporary, that's either now been fixed in R-devel or the r-hub images or wherever those images get their R-devel from.

Closing this.

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