[phobos] Showstopper bug: Hello world fails on OSX!

[Sean Kelly]

The library code isn't different between OS versions so my guess is that this is somehow related to object file generation within the compiler.  backend/machobj.c didn't change between May 10th and Jun 11th however, so I'm not sure what to suggest.  If it helps, here are the druntime and DMD timelines for DMD 2.047:

http://dsource.org/projects/druntime/timeline?from=6%2F11%2F10&daysback=32&wiki=on&changeset=on&milestone=on&ticket=on&update=Update
http://dsource.org/projects/dmd/timeline?from=6%2F11%2F10&daysback=32&wiki=on&changeset=on&milestone=on&ticket=on&update=Update

I don't see anything in the druntime changelog that should affect TLS.  The DMD changelog will take longer to go through though.

On Nov 8, 2010, at 12:33 PM, Jacob Carlborg wrote:

> I can reproduce the error using 2.050 on Mac OS X 10.5.8.
> 
> On 8 nov 2010, at 20:02, Sean Kelly wrote:
> 
>> I can't reproduce using 2.050 and OSX 10.6.  Is anyone still on 10.5 that can try this with 2.050?
>> 
>> On Nov 8, 2010, at 3:46 AM, Don Clugston wrote:
>> 
>>> Bug 4854. "Regression(2.047, Mac only) writefln Segmentation fault if
>>> no globals"  Confirmed by 3 people.
>>> 
>>> Thread local storage isn't getting set up correctly. Perhaps this
>>> happens when TLS is used in a library, but not in user code.
>>> This behaviour was introduced in 2.047, though it may have been a
>>> latent bug which was only triggered in that release.
>>> This may be a druntime bug, though it is more likely to be a compiler bug.
>>> 
>>> Although this is OSX-specific, this bug could still be a PR disaster.
>>> Perhaps an OSX user can track down which svn commit triggered the regression.
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>> 
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> -- 
> /Jacob Carlborg
> 
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