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Re: How to clear unknown pragma warning for OpenMP?
- From: Jeffrey Walton <noloader at gmail dot com>
- To: "gcc-help at gcc dot gnu dot org" <gcc-help at gcc dot gnu dot org>
- Date: Thu, 23 Jul 2015 13:29:12 -0400
- Subject: Re: How to clear unknown pragma warning for OpenMP?
- Authentication-results: sourceware.org; auth=none
- References: <CAH8yC8m6XU1LW9cyRL1nZ5eMH_hizr38CLcKRbnm+33Hn6np3Q at mail dot gmail dot com> <CAH6eHdRq2W9ArCiN4avKZbvvD+kTCPsPS7=q3WixRH=6-V_qRw at mail dot gmail dot com>
- Reply-to: noloader at gmail dot com
>> g++ -DNDEBUG -g2 -O3 -Wall -fPIC -march=native -pipe -c rw.cpp
>> rw.cpp:130:0: warning: ignoring #pragma omp parallel [-Wunknown-pragmas]
>> #pragma omp parallel sections if(CRYPTOPP_RW_USE_OMP)
>> ^
>
> Pretty ugly, but if you want the OpenMP directives to be dependent on
> whether OpenMP support is actually enabled you could do:
>
> #if _OPENMP
> #pragma omp section
> #endif
>
Yeah, we kind of looked at that and rejected it some time ago.
What do you think about some #defines to make them disappear? Can a
define be crafted that captures multiple lexemes or tokens?
Jeff