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Re: possible code error at run_command.c

From
Johannes Sixt <j.sixt@viscovery.net>
Date
Dec 21, 2009, 07:43 UTC
Message-ID
<4B2F2727.4060405@viscovery.net>
In-Reply-To
<1976ea660912202329x42f6add3j9175867e8723a4bd@mail.gmail.com>
Frank Li schrieb:
Show 10 quoted lines
>> This is a commonly used idiom to avoid an (incorrect) compiler warning
>> about an uninitialized variable.
>>
>> Strictly speaking, I think that you are right by saying "means nothing"
>> because the use of the uninitialized variable invokes undefined behavior
>> (and for this reason, I dislike this construct), but in practice it will
>> not make a difference.
>>
> 
> This error is captured at MSVC environment by run time varible check.
Disable this check - it just takes away performance. :-)
(If you don't disable the check, then keep the required changes private.)
> I prefer change it to
> int failed_errno = errno;

You don't need to initialize the variable at all because it is always initialized elsewhere before it is used. Perhaps MSVC is clever enough to see it?

-- Hannes
Previous: Frank LiNext: Frank Li
Message 5 of 11 in “possible code error at run_command.c”
  1. Frank LiDec 21, 2009
  2. Wincent ColaiutaDec 21, 2009
  3. Johannes SixtDec 21, 2009
  4. Frank LiDec 21, 2009
  5. Johannes SixtDec 21, 2009
  6. Frank LiDec 21, 2009
  7. Johannes SixtDec 21, 2009
  8. Erik Faye-LundDec 21, 2009
  9. Johannes SixtDec 21, 2009
  10. Erik Faye-LundDec 21, 2009
  11. Frank LiDec 21, 2009

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