@mosteo What can I do with this? CI fails just because there is no alr 2.0.1 for Mac OS X ARM64.

This should start working the moment we have a stable release for aarch64, right? (after patching the downloads here). So it will only fail for people trying to install a non-existent aarch64 compiler. If this is so, we could simply merge as-is.

But what about the macos nightly test, that one should work, right?

Let's see IIUC: This was working until now because we always downloaded x86_64 on macOS, and this runs in some compatibility layer even on the new arm64 runners.

With this PR, when setup-alire is used from an aarch system, it will attemp to use an aarch64 installation, that don't yet exist.

Is that correct?

Assuming so: I see no urgency to merge this one before the proper tooling is available for arm64; even giving this PR the next major version can only confuse those that think that they can update to v4 without expecting trouble.

it depends on what you mean by ‘working’. If downloading x86_64 Alire which is not able to put aarch64 compiler is working, then you are right. But in my opinion it is not what users expect.

To summarize AArch64 support:

So, merging this PR let me use it like this:

      - name: Get GNAT toolchain with alire
        uses: alire-project/setup-alire@v4
        with:
          version: "nightly"
          toolchain: gnat_native^14 #gprbuild^24 # no gprbuild for ARM64

Then install gprbuild^24 from a custom index (until PR 1119 is merged). I need it in new GitHub Actions scripts for ada_language_server.

I meant working in the sense that the action doesn't fail and the user ends with a usable toolchain, although I recognize it may be not the expected one.

My confusion wrt alire-project/alire-index#1119 was that I thought you were providing that at AdaCore's initiative, but I must understand now that you're doing that on your own? I was waiting for approval from @Fabien-Chouteau on that one.

Sorry for confusion about gprbuild. Now we have both gprbuild and gnat_native in the community index.

PS What can I do to help releasing alr 2.1.0 for Mac OS X ARM64?

PS What can I do to help releasing alr 2.1.0 for Mac OS X ARM64?

One thing we will need is a workflow in the alire repo that builds the arm64 version. We are now testing on macos-12, so we would need also to use macos-latest. The workflow is ci-macos.yml.

Superseded by #82. Thanks for leading the way, Maxim.