Re: GCD and blocks cross development
Re: GCD and blocks cross development
- Subject: Re: GCD and blocks cross development
- From: Steve Christensen <email@hidden>
- Date: Thu, 10 Sep 2009 07:05:50 -0700
Your program couldn't crash before running... :)
On Sep 10, 2009, at 7:00 AM, Jean-Daniel Dupas wrote:
I never said it will run before crashing ;-)
FWIW, clang refuses to compile block if deployment target < 10.6.
Le 10 sept. 2009 à 15:54, Steve Christensen a écrit :
I would expect that any external symbols would be weak-linked,
just like linking against any other 10.6-only symbol when your
deployment target is set to something pre-10.6. And if the symbol
weren't weak-linked, I would expect that the app would not load
because it couldn't find a symbol rather than actually running and
then crashing.
On Sep 10, 2009, at 1:33 AM, Jean-Daniel Dupas wrote:
My main concern would be block runtime linking issues. When you
use blocks, the compiler generate call to the block runtime
(libSystem on SL), but does it generate weak symbol or will the
program crash at launch time on 10.5.
Note that a simple test will give the answer, but I don't have
both OS right now.
Le 10 sept. 2009 à 00:49, Steve Christensen a écrit :
My understanding is that GCD is only supported on 10.6 and
later. This means you'd need to have some sort of runtime check
that would perform your tasks without GCD if running on a
pre-10.6 OS version.
On Sep 9, 2009, at 3:04 PM, email@hidden wrote:
Sorry, not quite sure which list to hit here/
The Grand Central Dispatch headers seem to include availability
macros.
Does that mean we can cross development for a deployment target
of 10.5 with a 10.6 base SDK and use blocks and GCD?
-- Jean-Daniel
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