Re: V8.0rc1 On AIX.

That's a good point. Should we just use cc_r for all thread compiles on
AIX if they are using cc and not gcc? I am not ready to have the
backend compiled with cc_r at this stage so I think this level of
support has to wait until 8.1.

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Travis P wrote:
>
> On Dec 14, 2004, at 12:51 PM, Bruce Momjian wrote:
>
> > Peter Eisentraut wrote:
> >> Bruce Momjian wrote:
> >>> Huh, isn't this port testing? Do we not want to fix port bugs at
> >>> this stage?
> >>
> >> We are not really fixing anything, because it was never expected to
> >> work
> >> before. We are adding new functionality. It is, of course, a
> >> borderline case. But for example, do we have any information about
> >> whether what is being implemented actually works? I don't want to
> >> find
> >> out in two weeks, that yes, we managed to compile with thread support,
> >> but no, threaded applications still have issues on that platform.
> >
> > I assume threads are supposed to work on all platforms that support it.
> > We have new threading detection code in 8.0 so I expected some
> > adjustments. Also, someone pointed out that the problem was reported
> > during beta but I missed it.
> >
> > As far as testing we have to have the users do any testing. The thread
> > testing script already tests threading but the actual compile success
> > is
> > what we are adjusting now.
>
> And that failure was, as I understand it, to accommodate using
> /usr/bin/cc because as I mentioned in my port report on an AIX 5.1
> system, /usr/bin/cc_r already works as-is.
>
> I believe that cc_r just adds -DTHREAD_SAFETY, adds -lpthead, sets a
> LIBPATH such that /usr/lib/threads preceeds /usr/lib/ so you pick up a
> thread-safe libc.a (which you don't even necessarily need unless you
> are assuming some libc functions are thread-safe -- if you are doing
> higher-level sync yourself, then that might not even be necessary), and
> cc_r does whatever other default defines, etc are best for a safe
> multithreaded compilation. As I recall, it used to just be a
> shell-script wrapper in AIX 4 days.
>
> Now, on my AIX 5.1 system, /usr/bin/ cc and cc_r are both just symlinks
> back to /usr/vac/bin/xlc. The different program names just invoke the
> different settings. Brad: can you make such a symlink and compile
> with that?, for example:
> /home/u/brad/cc_r -> /usr/bin/xlc
> ./configure CC=/home/u/brad/cc_r ....
>
> Certainly, pthreads do generally work on AIX. I've been using them for
> years. However, I always use cc_r (or xlC_r) for multithreaded apps.
> Peter has a point that the patch makes it compile, but does it make all
> necessary adjustments such that everything will always work? I can't
> answer that.
>
> -Travis
>
>
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