[webkit-dev] -fstrict-aliasing error
rgveda99 at yahoo.it
Wed May 17 07:17:30 PDT 2006
Inizio messaggio inoltrato:
> Da: Andrea Mannori <rgveda99 at yahoo.it>
> Data: 16 maggio 2006 9:33:25 GMT+02:00
> A: Geoffrey Garen <ggaren at apple.com>
> Oggetto: Re: [webkit-dev] -fstrict-aliasing error
> Il giorno 15/mag/06, alle ore 17:38, Geoffrey Garen ha scritto:
>> What warnings do you get?
>> I haven't tried compiling WebCore and WebKit with -fstrict-
>> aliasing. However, I suspect that the warnings and errors you get
>> result from type punning through pointers. To make the code safe
>> for strict aliasing, you would need to change all pointer-based
>> type punning to union-based type punning.
>> I think there's a compiler warning flag, like -Wstrict-aliasing,
>> that can help you track down unsafe type punning.
> here i have an example:
> cc1obj: warnings being treated as errors
> /Users/andrea/WebKit/WebCore/bridge/mac/WebDashboardRegion.m: In
> function '-[WebDashboardRegion description]':
> warning: dereferencing type-punned pointer will break strict-
> aliasing rules
> and going to the source:
> return [NSString stringWithFormat:@"rect:%@ clip:%@ type:%s",
> so if i write
> return [NSString stringWithFormat:(NSString *)"rect:%@ clip:%@
> i don' t have error more... is that correction right? it seem to me
> and at last, even correcting all that kind of error
> And at last I cannot correct the same kind of error that retur me
> the CFSTR macro (used in the right mode to my eyes)
> thankyou all
ps: sorry to goffrey, i have sent these message to you for wrong!
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