Re: Why buildfarm member anchovy is failing on 8.2 and 8.3 branches

On 08/28/2011 04:15 PM, Tom Lane wrote:
> I spent a bit of time looking into $SUBJECT.  The cause of the failure
> is that configure mistakenly decides that setproctitle and some other
> functions are available, when they aren't; this eventually leads to link
> failures of course.
>
> Now 8.2 and 8.3 use autoconf 2.59.  8.4 and up, which do not exhibit
> this failure, use autoconf 2.61 or later.  Sure enough, there is a
> difference in the test program generated by the more recent autoconfs:
> they actually try to call the function, where the previous ones do
> something weird involving a function pointer comparison.  I dug in the
> autoconf change log and found this:
>
> 2005-10-19  Paul Eggert<eggert@cs.ucla.edu>
>
>     (AC_LANG_FUNC_LINK_TRY(C)): Call the function rather than simply
>     comparing its address.  Intel's interprocedural optimization was
>     outsmarting the old heuristic.  Problem reported by
>     Mikulas Patocka.
>
> Since anchovy is using the "gold" linker at -O3, it's not exactly
> surprising that it might be carrying out aggressive interprocedural
> optimizations that we're not seeing used on other platforms.
>
> The bottom line seems to be that autoconf 2.59 is seriously broken on
> recent toolchains.  Should we try to do something about that, like
> migrate the 8.2 and 8.3 releases to a newer autoconf?  8.2 is close
> enough to EOL that I don't mind answering "no" for it, but maybe we
> should do that in 8.3.
>
>


If we're going to do it for 8.3 we might as well for 8.2 at the same 
time, ISTM, even if it is close to EOL.

Is -O3 a recommended setting for icc?

cheers

andrew