Gprbuild confusion between normal & external versions

[simonjwright]

In the ubuntu-latest workflow of the Ada example in my fork of sdl2-examples, we’re seeing that

• alr --non-interactive toolchain --install gprbuild installs the external gprbuild gprbuild=2021.0.0+0778
• alr --non-interactive toolchain --select gprbuild sets gprbuild-22.0.1 in the configuration

The workflow uses the version: "nightly".

The run above was today, and succeeded, but a similar run executed today in the repo of which mine is a fork failed with "ERROR: Requested tool configured as gprbuild=22.0.1 but not installed: gprbuild".

Would this problem go away if Alire didn’t choose the external gprbuild when a 'normal' (?) crate is available?

[mosteo]

The different selected version likely comes from --select attempting to find a gprbuild compatible with the gnat already selected. Was there one in your second run? --install won't attempt to do that, so it will select the newest version, provided by the external one in that case.

As for the error, it should have been fixed after #1533. It is possible you have to invalidate the action caches in your org.