[R-SIG-Mac] Robust compiler toolchain for R-devel

[Matthias Krawutschke]

Hey Patrick,

i had the same issue /problem on my MAC.
First of all you need from Apple XCODE the Command-Line. 

I find here a good instruction to do that:
https://wiki.helsinki.fi/display/HUGG/GNU+compiler+install+on+Mac+OS+X

But, I´m not sure if you can compile the GNU-C 9.x - Version.
Try it and if you have found out, how - please let me know.

Best regards….



Matthias Krawutschke, Dipl. Inf.

Universität Potsdam
ZIM - Zentrum für Informationstechnologie und Medienmanagement
Arbeitsbereich: High-Performance-Computing on Cluster - Environment

Campus Am Neuen Palais: Am Neuen Palais 10 | 14469 Potsdam
Tel: +49 331 977-4444, Fax: +49 331 977-1750

Internet: https://www.uni-potsdam.de/de/zim/angebote-loesungen/hpc.html


-----Ursprüngliche Nachricht-----
Von: R-SIG-Mac <r-sig-mac-bounces using r-project.org> Im Auftrag von Patrick Schratz
Gesendet: Dienstag, 18. Februar 2020 09:15
An: Martin Jean via R-SIG-Mac <r-sig-mac using r-project.org>
Betreff: [R-SIG-Mac] Robust compiler toolchain for R-devel

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

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