macOS Big Sur Updates, master branch (2020.11.15.)

These are all the changes that I needed to make to get AnalysisBaseExternals to build on the newly released macOS Big Sur.

Most importantly I had to switch from Python 3.7.6 to 3.8.6, and I had to backport some fixes from the ROOT git repository on top of 6.22/02. Everything else was either a purely technical update, or a consequence of the Python update.

Pinging @krumnack and @emoyse, who may be interested in this. Note that of course I only tested this on x86. Since I won't be getting an ARM -- excuse me, Apple Silicon -- Mac just yet, any updates necessary for those will have to come from someone else...

Hi @akraszna,

Will there be an equivalent merge request for 21.2?

Regards, Nils

AE Build SUCCESS
Build logfiles are available at Jenkins [AE-MERGE-REQUEST-CC7 #384]

Hi @akraszna,

I don't have a feeling about how it looks now, but it used to be that a fair fraction of people preparing MRs for 21.2 were working on MacOS. That's mostly based on how often people missed includes like <memory> that are not needed on MacOS, but are needed on SL.

Cheers, Nils

resolved all threads

mentioned in commit 16eb7994

merged

mentioned in merge request !788 (merged)