[haiku-development] Re: Switch to Clang or GCC 4.9?
- From: Pawel Dziepak <pdziepak@xxxxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Fri, 25 Apr 2014 19:28:48 +0200
2014-04-25 18:42 GMT+02:00 Jonathan Schleifer
<js-haiku-development@xxxxxxxxxxx>:
> Am 25.04.2014 um 18:30 schrieb Pawel Dziepak <pdziepak@xxxxxxxxxxx>:
>
>> Could you elaborate on what was wrong with GCC handling destructors of
>> global objects? It is quite precisely defined by Itanium C++ ABI
>> (namely __cxa_atexit(), __cxa_finalize() and friends) so I wouldn't
>> expect big difference in lower level implementation.
>
> Yes, however, GCC only does that if GCC has been built with the right
> options. And -fno-use-cxa-atexit is handled differently: In GCC, it just
> seems to disable the calls to __cxa_atexit and __cxa_finalize, whereas it
> seems to turn __cxa_atexit into atexit in Clang. Though I remember that the
> manpage even said something about GCC doing something different on
> -fno-use-cxa-atexit depending on how GCC was configured.
With -fno-use-cxa-atexit GCC relies mostly on .ctors and .dtors
sections, there is nothing wrong with that. However, more important
question is why are we using -fno-use-cxa-atexit at all?
Paweł
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