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Re: Non human friendly error message from compiler with exceptions
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Re: Non human friendly error message from compiler with exceptions


  • Subject: Re: Non human friendly error message from compiler with exceptions
  • From: Jens Miltner <email@hidden>
  • Date: Mon, 14 Jul 2008 08:38:25 +0200


Am 11.07.2008 um 14:45 schrieb Stéphane Sudre:


On Jul 11, 2008, at 10:04 AM, Ken Thomases wrote:

On Jul 11, 2008, at 2:48 AM, Stéphane Sudre wrote:

"Mac OS X version 10.5 or later is needed for zerocost-exception"

What is this sentence trying to say?

I'm not entirely sure. Are you trying to compile some Objective-C for 64-bit architecture but also specifying a deployment target of 10.4?


Here's some background: With Leopard, Apple revamped the Objective- C ABI but only for 64-bit. They couldn't do so for 32-bit because it would break binary compatibility. In the 64-bit ABI, Objective- C exceptions were based on the same mechanisms as C++ exceptions, which makes them zero-cost unless an exception actually happens.

That message seems to suggest you have asked the compiler to emit code relying on that ABI, but also said you may deploy it on a target not supporting that ABI.


It looks like it's what you're describing.

Does this imply that you can not build a project easily on Xcode with exceptions support as soon as you want to test a 32/64-bit Universal Binary application that can run on Tiger and later?

It sounds like it might be the return of the "SDK_Deployment_ppc_32_or_something_like_this" options...

I'd assume that there would be an option to specify the exception mechanism to use (i.e. allow for backward-compatible exception support in 64-bit binaries, too).


</jum>



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  • Follow-Ups:
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References: 
 >Non human friendly error message from compiler with exceptions (From: Stéphane Sudre <email@hidden>)
 >Re: Non human friendly error message from compiler with exceptions (From: Ken Thomases <email@hidden>)
 >Re: Non human friendly error message from compiler with exceptions (From: Stéphane Sudre <email@hidden>)

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