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<div class="moz-cite-prefix">On 5/18/2019 4:30 AM, J. Gareth Moreton
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:03f089b6-76b5-72c7-157f-6539aa6c33d8@moreton-family.com">Hi
everyone,
<br>
<br>
So it looks like this new warning has appeared as part of the data
flow analysis of -O4. The thing is, I personally have a problem
with this being a warning, because there's nothing inherently
wrong with not covering every case branch or omitting an else
block (especially if one isn't needed). Adding "else ;"
everywhere seems to just cause bloat.
<br>
<br>
Still, code style aside, can I suggest the warning be downgraded
into a hint? Warnings should indicate the possibility of unstable
code due to uninitialised values, for example, and DFA should be
able to detect that anyway as a separate warning (e.g. if a case
block doesn't initialise an output value in all of its branches).
</blockquote>
<p>Sorry, but you seem to suffer from the "lazy programmer
syndrome". A warning is correct, as a case of unhandled <b><i>case</i></b>
statement can indeed lead to unexpected side effects. While there
could be cases where you might want to react with the <i><b>case</b></i>
statement to only certain conditions (and can safely assume that
all other conditions don't do ill effects), there is also the case
where an unknown/unexpected condition is passed and that can have
dire consequences, and should be properly acted upon, by the <i><b>else</b></i>
clause within the case statement...</p>
<p>Ralf<br>
</p>
<br>
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