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error: Kill @error_warn

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We added @error_warn some two years ago in commit 3ffef1a55c (error:
add global &error_warn destination).  It has multiple issues:

* error.h's big comment was not updated for it.

* Function contracts were not updated for it.

* ERRP_GUARD() is unaware of @error_warn, and fails to mask it from
  error_prepend() and such.  These crash on @error_warn, as pointed
  out by Akihiko Odaki.

All fixable.  However, after more than two years, we had just of 15
uses, of which the last few patches removed seven as unclean or
otherwise undesirable, adding back five elsewhere.  I didn't look
closely enough at the remaining seven to decide whether they are
desirable or not.

I don't think this feature earns its keep.  Drop it.

Thanks-to: Akihiko  Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-ID: <20250923091000.3180122-14-armbru@redhat.com>
Reviewed-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
This commit is contained in:
Markus Armbruster 2025-09-23 11:10:00 +02:00
parent e0c6c38738
commit bcb536cabe
11 changed files with 49 additions and 39 deletions
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6
include/qapi/error.h
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@ -533,12 +533,6 @@ static inline void error_propagator_cleanup(ErrorPropagator *prop)
G_DEFINE_AUTO_CLEANUP_CLEAR_FUNC(ErrorPropagator, error_propagator_cleanup);
/*
* Special error destination to warn on error.
* See error_setg() and error_propagate() for details.
*/
extern Error *error_warn;
/*
* Special error destination to abort on error.
* See error_setg() and error_propagate() for details.