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Merge branch 'debug-invocation' into 'main'

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gmessages: Treat DEBUG_INVOCATION=1 same as G_MESSAGES_DEBUG=all

See merge request GNOME/glib!4412
This commit is contained in:
Philip Withnall
2024-11-29 16:13:02 +00:00
parent b180a8ec70 5198798f9a
commit c50836535a
3 changed files with 131 additions and 76 deletions
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docs/reference/glib/logging.md
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@@ -92,13 +92,14 @@ The default log functions (`g_log_default_handler()` for the old-style API
and `g_log_writer_default()` for the structured API) both drop debug and
informational messages by default, unless the log domains of those messages
are listed in the `G_MESSAGES_DEBUG` environment variable (or it is set to
`all`).
`all`), or `DEBUG_INVOCATION=1` is set in the environment.
It is recommended that custom log writer functions re-use the
`G_MESSAGES_DEBUG` environment variable, rather than inventing a custom one,
so that developers can re-use the same debugging techniques and tools across
projects. Since GLib 2.68, this can be implemented by dropping messages for
which `g_log_writer_default_would_drop()` returns `TRUE`.
`G_MESSAGES_DEBUG` and `DEBUG_INVOCATION` environment variables, rather than
inventing a custom one, so that developers can re-use the same debugging
techniques and tools across projects. Since GLib 2.68, this can be implemented
by dropping messages for which `g_log_writer_default_would_drop()` returns
`TRUE`.
## Testing for Messages