Hi,
I am experimenting since some days to find the ?best? compiler toolchain for R-devel to get R-devel package source installs on the new macOS Github Actions runners work in a somewhat stable way.
I am also on macOS locally which I use for testing as well.
I am aware of?https://github.com/rmacoslib/r-macos-rtools. However, using clang7 for all (CC, CXX, etc) leads to some packages failing to build (sometimes due to missing OpenMP capabilities, sometimes undefined).
Therefore I decided to try out gcc (v8 and v9). While this solves most of the OpenMP issues, I am running into problems for other packages regarding CC compilation.
Turns out that using any clang version for CC solves most problems but not all.
However then I have a mix of gcc and clang which is most likely cause other issues.
Currently Jeroen is developing a new gcc8 based toolchain for Windows.
I was reading the macOS CRAN dev pages but could not find any reasoning why
? clang7 is suggested
? gcc is not used
? What future plans are there for the toolchain on macOS
Could someone shine some light on this? Thanks :)
Cheers, Patrick