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glib2.0/docs/meson-version.md

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Meson version policy

Aims

  • Stable versions of GLib should be buildable from source on the majority of systems which are still supported by their vendors, without requiring the user to manually build a number of dependencies
  • Unstable versions of GLib should be able to take advantage of newer build system features where they would make maintenance of GLib easier, without prejudicing the other aims

Policy

  • Stable branches of GLib will not change their Meson dependency after the first release of that stable series
  • Unstable branches of GLib can bump their Meson dependency if
    • at least that version of Meson currently available in Debian Testing; or
    • the Python version required by the new Meson dependency is available in Debian Stable and the oldest currently-supported Ubuntu LTS
  • The version of Meson used by GLib should be pinned and pre-installed in the CI Dockerfiles so that GLib is guaranteed to be built against the expected version

The reasoning behind allowing a version bump if the Python which Meson depends on is available in Debian Stable is that it’s straightforward to install a more recent Meson version using pip.