[LLVMdev] broken Atomic.cpp on Darwin

[Owen Anderson]

No, that should work fine, and is exactly what I use to compile  
atomics on Darwin.

--Owen

On May 23, 2009, at 11:02 PM, Xi Wang wrote:

> Thanks.  I think I am using Apple GCC 4.2.
>
> i686-apple-darwin9-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5566)
>
> Should I use something else for LLVM?
>
> - xi
>
> On Sun, May 24, 2009 at 1:20 AM, Owen Anderson <resistor at mac.com>  
> wrote:
>>
>> On May 23, 2009, at 9:41 PM, Xi Wang wrote:
>>
>> There is no __sync_synchronize or __sync_val_compare_and_swap on Mac
>> OS X.  One might use OSMemoryBarrier or OSAtomicCompareAndSwap32
>> instead.  The patch is attached.
>>
>> Actually, __sync_synchronize and __sync_val_compare_and_swap DO  
>> exist on
>> Darwin, but only if you use Apple's GCC 4.2 (or later), just as it  
>> is on
>> Linux.  We always want to use these intrinsic versions if possible,  
>> because
>> they're much lower overhead.
>> The policy Chris has proposed is that we simply do not support  
>> multithreaded
>> LLVM with a host compiler pre-GCC 4.2.  If you need multithreaded  
>> LLVM on an
>> unsupported platform, you can build a single threaded LLVM and LLVM- 
>> GCC, and
>> then use that to build a multithreaded LLVM.
>> --Owen
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>
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