Thanks for the replies!

Do (Mach-O?) binaries encode which extensions to the x86 set they make
use of?

Can one expect a warning when loading an incompatible binary, or will
it run with an undefined behavior?

(I know this is a bit out-of-topic, but I think it might interest
other readers of this thread.)

Best wishes,
Renaud.


On 18 Aug 2010, at 18:59, Jean-François Mertens wrote:

> 
> On 18 Aug 2010, at 18:42, David R. Morrison wrote:
> 
>> There is one exception to this that I'm aware of: the gmp package  
>> does cpu-specific optimization at compile time.  But the cpu- 
>> specific optimizations tend to be upward-compatible, so if you  
>> compile this package on your least-capable machine, it should run on  
>> the others.
> 
> atlas and its deps are another exception, the whole purpose
> of the pkg being to tune things to the specific CPU at hand.
> And I've probably noticed a couple of other exceptions,
> from glancing when they were building _ not sure this was
> more than mere tuning... Anyway, there should be very few.
> 
> JF Mertens
> 
> 
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