Addresses "If running a package uses multiple threads/cores it must never use more than two simultaneously"

[eitsupi]

https://cran.r-project.org/web/packages/using_rust.html says:

cargo build -j N defaults to the number of ‘logical CPUs’. This usually exceeds the maximum allowed in the CRAN policy, so needs to be set explicitly to N=1 or 2.

The easy way to deal with this seems to be to set CARGO_BUILD_JOBS=2 in the Makevars file. (PRQL/prqlc-r#151)

[jeroen]

Thanks!