Re: TLS support on NetBSD

[Ken Raeburn]

On Oct 23, 2009, at 19:40, Greg Troxel wrote:
> Thanks - I think there is actually no tls support yet.
>
> I will take a look at the autoconf issue when I have time - but I'm  
> very
> busy at work this week.

I just took a little bit of a look... on my NetBSD 5.0.1 x86 system,  
the __thread support simply uses the %gs segment register, but the  
kernel or library or whatever doesn't seem to have set it up  
properly.  So it compiles and links just fine for me, but crashes when  
running.

I think the autoconf test is thus going to have to run a test program  
to see if __thread is supported, which means it won't be friendly to  
cross-compilation setups.  (I still don't have all the dependencies  
built for NetBSD, so no working patch.)  Or, we could hard-code  
knowledge about systems where compiling and linking work but execution  
fails; that's generally frowned upon....

Ken