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CoreAudio SDK and strict aliasing

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CoreAudio SDK and strict aliasing

Subject: CoreAudio SDK and strict aliasing
From: "Frederik Slijkerman" <email@hidden>
Date: Wed, 15 Feb 2006 13:36:21 +0100

Hi,

I've run into a bug in the CoreAudio 1.4.3 SDK, in AUScopeElement.cpp:

const UInt8 * AUElement::RestoreState(const UInt8 *state)
{
...
 entry.value = *(Float32 *)&temp;
...
}

This breaks the strict-aliasing rules in GCC 4 and therefore the float value is not restored correctly. I think it should be fixed by using a union.

Questions:

1. Should the CoreAudio SDK be compiled with -fno-strict-aliasing?

2. How to specify -fno-strict-aliasing? I've tried inserting it manually, or unchecking the Strict Aliasing checkbox, but it doesn't seem to have any effect. Strict aliasing is probably enabled automatically by -fast, but how can I get the other -fast effects without strict aliasing?

Frankly, I could do without strict aliasing as it seems to give nothing but headaches, and it doesn't seem to help much with optimization anyway. So I'm very willing to disable it -- if I knew how.

Thanks!
Frederik Slijkerman

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