Re: [Bug-gsl] make check fails on AIX 5.2.0 in 64 bit mode

[Olaf Lenz]

Hello!

Brian Gough wrote:
>  > However, "make check" seems to fail in the "rng" subdir, now. I've
>  > attached the output to this mail. It seem that the ranlx-generators
>  > do work differently on a 64 bit platform?
>
> Would it be possible for you to look at this in the debugger with a
> simple test program?.... a quick inspection of these files doesn't
> show me anything obvious that would cause a problem on 64bit
> platforms, so I am not sure why it is failing.

I've played around with different compiler switches, and apparently I've found 
the problem there. In higher optimization levels, the AIX compiler assumes 
"-qhot", i.e. "Higher Order Transformations". From the docs:
        
"Instructs the compiler to perform high-order transformations on loops and array 
language during optimization, and to to pad array dimensions and data objects to 
avoid cache misses.
[clip]
Both -qhot=arraypad and -qhot=arraypad=n are unsafe options; they do not perform 
any checking for reshaping or equivalences that may cause the code to break if 
padding takes place."

I suppose this may be the case here (even though I haven't looked into the 
code). I think I'm going to dig deeper into the problem later, but not now. I'll 
keep you informed.

> To see if there are going to be other failures later you might want to
> try "make -k check" also

Wow, that was the option I was looking for...

signature.asc
Description: OpenPGP digital signature