Re: select$DARWIN_EXTSN$NOCANCEL vs select$DARWIN_EXTSN
Re: select$DARWIN_EXTSN$NOCANCEL vs select$DARWIN_EXTSN
- Subject: Re: select$DARWIN_EXTSN$NOCANCEL vs select$DARWIN_EXTSN
- From: Jean-Daniel Dupas <email@hidden>
- Date: Tue, 04 Oct 2011 12:35:39 +0200
Le 4 oct. 2011 à 12:15, Mike Richmond a écrit :
>
> On 3 Oct 2011, at 20:06, Jonas Maebe wrote:
>
>> On 03 Oct 2011, at 17:43, Mike Richmond wrote:
>>
>>> What I can't get to work though is building on 10.6 with the 10.4u SDK. In that case I note that select$DARWIN_EXTSN$NOCANCEL() is being called, whereas I think I want select$DARWIN_EXTSN() to be called (as I see when using the 10.5 and 10.6 SDKs).
>>
>> The Mac OS X 10.4 version of libSystem contained only one version of select. It did not have a NOCANCEL version (nor even a DARWIN_EXTSN version, so I'm not sure why you think that version is being called).
>
> There's only one version of select() when building on 10.4 with tools and SDKs from Xcode 2.4.1, but its behaviour varies dependent on whether I define _POSIX_C_SOURCE or not.
>
> However when I build and run on 10.6 against the 10.4u SDK using GCC 4.0 from Xcode 3.2.x I see:
>
> #0 0x9191a58a in select$DARWIN_EXTSN$NOCANCEL ()
> #1 0x919b2c4b in select ()
> #2 0x00001dce in timer_fn ()
>
> and none of the defines mentioned in <http://developer.apple.com/library/mac/#releasenotes/
> Darwin/SymbolVariantsRelNotes/index.html> affect it. I was expecting defining _POSIX_C_SOURCE to make a difference, as it does when building on 10.4, but it doesn't.
>
> cf building with GCC 4.2 against the 10.6 SDK:
>
> #0 0x918fdac6 in select$DARWIN_EXTSN ()
> #1 0x00001d06 in timer_fn ()
> #2 0x9190c259 in _pthread_start ()
>
> ISTM that there should be something I can define so that I get select$DARWIN_EXTSN when using the 10.4u SDK on 10.6, so that I can get the same behaviour as when I build on 10.4.
As already mentioned, there is only one version of select in 10.4 libSystem.
If you managed to generate a call to something else than select, when trying to run on 10.4, you will get a crash due to missing symbol.
-- Jean-Daniel
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