Making an R module linking OpenBLAS statically

Question

I am trying to build an R module linking statically OpenBLAS:

mypkg/
├── DESCRIPTION
├── NAMESPACE
├── R/
│ ├── check_openblas.R
│ ├── my_interface.R
│ └── openblas_init.R
├── inst/
│ └── libs/
│ ├── linux/
│ │ └── libopenblas.a
│ └── windows/
│ └── libopenblas.a
└── src/
 ├── Makevars
 ├── Makevars.win
 ├── Makevars.macos
 └── openblas_probe.c

For now I am only testing on linux. Makevars contains:

PKG_LIBS = ../inst/libs/linux/libopenblas.a -lpthread -lm

and libopenblas.a built as

make BINARY=64 USE_OPENMP=1 NO_SHARED=1

Also, openblas_probe.c contains a call to "openblas_get_config()".

However, after loading my package succesfully into R and performing linear algebra operations, I can see only one core being used. Also,

> sessionInfo()$BLAS
[1] "/usr/lib/x86_64-linux-gnu/openblas-pthread/libblas.so.3"

Keeps returning the default BLAS.

I would greatly appreciate your help in understanding what is wrong with this idea, or how I could make it work.

• Chris: You might look at how flexiblas is implemented for ideas, or end up simply using it. From authors of simmer. And if you can get it working on Windows, they might adopt you.