GH Actions: Test also with Xcode 12 beta

[mkoeppe]

in preparation for macOS 11 - see https://groups.google.com/d/msg/sage-support/ZLgu-1pi6nc/LH2Mma_uAgAJ

The workflow can be seen at:

• https://github.com/mkoeppe/sage/runs/1059961873 (confirming previously reported package build errors)
• https://github.com/mkoeppe/sage/runs/1059961897 (revealing that some homebrew packages fail in from-source builds)

Part of meta-ticket #30494: Support Xcode 12, macOS 11 Big Sur

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References:

https://github.com/marketplace/actions/setup-xcode-version

https://github.com/actions/virtual-environments/blob/main/images/macos/macos-10.15-Readme.md#xcode

CC: @jhpalmieri @kliem

Component: porting

Author: Matthias Koeppe

Branch/Commit: bec68e2

Reviewer: Jonathan Kliem

Issue created by migration from https://trac.sagemath.org/ticket/30487

[mkoeppe]

Author: Matthias Koeppe

[mkoeppe]

Reviewer: github.com/mkoeppe/sage/actions/runs/235534837

[mkoeppe]

Changed reviewer from github.com/mkoeppe/sage/actions/runs/235534837 to github.com/mkoeppe/sage/actions/runs/235542644

[mkoeppe]

Branch: u/mkoeppe/gh_actions__test_also_with_xcode_12_beta

[mkoeppe]

New commits:

bec68e2

.github/workflows/tox.yml: Test with XCode 12 beta

[mkoeppe]

Commit: bec68e2

[kliem]

comment:7

Isn't the location of that thing /Applications/Xcode_12_beta.app?

It looks to me that you select /Applications/Xcode_12.app. Is this guaranteed to work?

[jhpalmieri]

comment:8

On my machine, it's /Applications/Xcode-beta.app.

[kliem]

comment:9

This contradicts https://github.com/actions/virtual-environments/blob/main/images/macos/macos-10.15-Readme.md#xcode, but I guess that is a "user" created page and maybe it is not up to date.

[kliem]

comment:10

LGTM.

[kliem]

Changed reviewer from github.com/mkoeppe/sage/actions/runs/235542644 to Jonathan Kliem

[mkoeppe]

comment:11

Replying to @kliem:

This contradicts https://github.com/actions/virtual-environments/blob/main/images/macos/macos-10.15-Readme.md#xcode, but I guess that is a "user" created page and maybe it is not up to date.

Yes, this page is outdated.

[mkoeppe]

comment:12

Replying to @kliem:

It looks to me that you select /Applications/Xcode_12.app. Is this guaranteed to work?

This is the path that currently works.

[mkoeppe]

comment:13

Replying to @kliem:

LGTM.

Thanks.

[vbraun]

Changed branch from u/mkoeppe/gh_actions__test_also_with_xcode_12_beta to bec68e2