extend gthr-posix.h with rwlock

[Luke Dalessandro]

David Edelsohn wrote:
>>>>>> Luke Dalessandro writes:
> 
> Luke> Thank you, this was indeed the problem. I added the needed stubbs in 
> Luke> gthr-single.h and it now compiles fine. Unfortunately there seems to be 
> Luke> something wrong with my installation of ld as linking fails with a large 
> Luke> number of errors of the form:
> 
> Luke> ld: 0711-252 SEVERE ERROR: File auxiliary symbol entry 1 in object _negdi2_s.o:
> Luke> Field x_offset contains 4. Valid values are between 4 and -1.
> Luke> The object name is being substituted.
> 
> Luke> Unfortunately I have almost no experience with AIX. I'll look for a prebuilt 
> Luke> ld that seems newer than mine to see if this helps the problem.
> 
> 	Pre-built ld?  AIX ships with ld.  Are you using GNU Binutils
> (gas, GNU ld, etc.) on AIX?  Please use the native AIX tools (as, ld, nm,
> etc.) with AIX as mentioned in the platform-specific installation notes:

No, I'm sorry I wasn't clear. I am using all of the AIX tools, not Binutils. I 
just assumed that there was something out-of-date with the ld that came with 
our AIX 5.1 installation.

> http://gcc.gnu.org/install/specific.html#x-ibm-aix

I have seen this page before, and I'm not sure that it helps me. I'm running 
into the same behavior posted at 
http://gcc.gnu.org/ml/gcc-bugs/2005-04/msg03175.html, where the advice is also 
to look at this page, but there doesn't seem to be a reply from the original 
poster.

Thanks,
Luke