[R-SIG-Mac] Which version of clang does CRAN's R build use?

[Duncan Murdoch]

On 2025-08-31 4:11 p.m., Duncan Murdoch wrote:
> The instructions on https://mac.r-project.org/tools/ say to install
> tools using `sudo xcode-select --install`.  Currently for me that installed
> 
>     Apple clang version 17.0.0 (clang-1700.0.13.5)
> 
> Is that the version of clang that is being used in the CRAN builds?  If
> not, is there an advantage to matching what was used?
> 

Just found on the download page for R 4.5.1 "This release uses Xcode 
16.2(arm64)/14.2(x86_64) and GNU Fortran 14.2."  So that answers my 
first question, but leaves the second one.  Is it worth installing that 
version?

Duncan Murdoch