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gmessages: Treat DEBUG_INVOCATION=1 same as G_MESSAGES_DEBUG=all

Philip Withnall requested to merge pwithnall/glib:debug-invocation into main

systemd 257 will now set DEBUG_INVOCATION=1 in the execution context of services which need to be debugged — for example if they’ve failed and been restarted (and RestartMode=debug).

If we handle DEBUG_INVOCATION=1 as being equivalent to G_MESSAGES_DEBUG=all, then any processes using GLib’s default log writer function (or g_log_writer_default_would_drop()) automatically gains support for this feature.

See https://mastodon.social/@pid_eins/113548825942383777

Signed-off-by: Philip Withnall pwithnall@gnome.org

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