CGAL users discussion list

[Marc Glisse <>]

On Thu, 29 May 2014, George Zagaris wrote:

> Dear CGAL community,
>
> First off, I would like to thank you for developing and maintaining CGAL.
> It is an excellent piece of software that I have found useful at various
> stages throughout my academic and professional career.
>
> More recently, I have ported a CGAL-based application for the BG/Q
> architecture, specifically on mira  (
> http://www.alcf.anl.gov/user-guides/mira-cetus-vesta) , compiling with an
> all IBM XL C/C++ toolchain.
>
> While I was able to compile CGAL statically, I was running in to problems
> when compiling the CGAL portions of the application. The issue was that
> Mpzf.h was using GCC builtin functions that were not recognized by the IBM
> XL C/C++ compiler. The fix was to use the corresponding builtin functions
> for the IBM compiler.

Is that the only problem you had? That's cool!

CGAL/FPU.h is probably not optimal with this compiler, but it is good that 
everything works.

> Attached is the modified Mpzf header and a patch in case others find useful.

Looks good, I'll try to apply it for the next release.

The IBM documentation I found is quite limited, it doesn't mention that 
you need to #include anything, and it doesn't specify if there are any 
corner cases (what happens if the argument is 0?).

Thank you for your message,

--
Marc Glisse