[Pw_forum] __OPENMP flag in QE

[Paolo Giannozzi]

Hi Ye

the only reason to have __OPENMP with two underscores is that all
preprocessing options in QE start with two underscores. If all
OpenMP-aware compilers honor _OPENMP, I agree that it may be a good
idea to drop one underscore and related "configure" stuff.

The OpenMP-enabled code has been running for years on the BG in
CINECA. I never noticed what you report.

Paolo

On Fri, Mar 17, 2017 at 8:45 PM, Ye Luo <xw111luoye at gmail.com> wrote:
> Ciao, Paolo,
> Is there a particular reason to keep __OPENMP instead of _OPENMP (single
> underscore) which is automatically added by the compiler when OpenMP is
> requrested?
> I'm asking this question because the __OPENMP flag is missing on BGQ on QE
> 5.X to 6.X when --enable-openmp is added. Using the standard flag may help
> reducing the maintenance pain of configure.
>
> Ye
> ===================
> Ye Luo, Ph.D.
> Leadership Computing Facility
> Argonne National Laboratory
>
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-- 
Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy
Phone +39-0432-558216, fax +39-0432-558222