[Octave-bug-tracker] [bug #45753] warning("error") breaks many things

[Lachlan Andrew]

URL:
  <http://savannah.gnu.org/bugs/?45753>

                 Summary: warning("error") breaks many things
                 Project: GNU Octave
            Submitted by: lachlan
            Submitted on: Fri 14 Aug 2015 03:12:59 AM GMT
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
             Assigned to: None
         Originator Name: Lachlan
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.0
        Operating System: GNU/Linux

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Details:

The code

warning("error")
help warning

causes the error message

error: concatenation of different character string types may have unintended
consequences

That means that once warning("error") is turned on, it is impossible to see if
it is possible to return warnings to their default settings.  Other functions
are affected too (I found it first in strread).

I'd like to fix this by making  warning("error")  only convert *enabled*
warnings to errors, rather than all warnings.  (That obeys the principle of
least surprise.)  This could either be those warnings enabled when the command
is issued (easiest and most efficient), or those warnings enabled when the
warning is triggered (probably the best, especially for user-defined
warnings).

An alternative is to go through all the libraries and eliminate all code that
can produce spurious warnings.  The extra checking etc may slow execution
down, and would add to code bloat.

(Apologies if this is a duplicate of something I just wrote; I tried to report
the bug, but the bug report didn't appear.)




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