[gmx-users] Fwd: CUDA compilation problem for Gromacs 5.1.2 (with fix)

[Mark Abraham]

Hi,

I don't know what they have done, but there is currently no way to ship a
distro with a default compiler of gcc 5+, that can compile CUDA code with
that compiler, without some work-around. Distros are normally unwilling to
ship with more than one system compiler, and they wouldn't hold the
compiler version back just for CUDA developer support, so I imagine they
have done something like you suggest.

Whether GROMACS wants to consider making this case work transparently is
another question... That would depend whether stock Ubuntu 16.04 has such
an issue with whatever gcc 5 it has.

Mark

On Tue, May 10, 2016 at 6:23 PM Sjoerd de Vries <sjdv1982 at gmail.com> wrote:

> On Tue, May 10, 2016 at 6:08 PM, Mark Abraham <mark.j.abraham at gmail.com>
> wrote:
>
> > Hi
> >
> > Yes, that's my point. There's no released version of CUDA that supports
> any
> > version of gcc 5. Apparently, to get a CUDA-supported version of gcc on
> > your distribution, you'd need a backport of gcc 4.9. Your information
> seems
> > useful for those wanting to live on the edge, though :-)
> >
> >
> Hi Mark,
>
> Thanks for your help, but now I am confused!!
>
> It seems to me that I am living rather far from the edge, I am running the
> most recent LTS version of the most popular Linux distro.
>
> if I understand you correctly, the maintainers of nvidia-cuda-dev (
> 7.5.18-0ubuntu1) in 16.04 must have willfully hacked
> /usr/include/host_config.h,
> just to fake gcc 5 compatibility?
>
> cheers
>
> Sjoerd
>
>
> > Mark
> >
> > On Tue, 10 May 2016 18:01 Sjoerd de Vries <sjdv1982 at gmail.com> wrote:
> >
> > > On Tue, May 10, 2016 at 5:32 PM, Mark Abraham <
> mark.j.abraham at gmail.com>
> > > wrote:
> > >
> > > > Hi,
> > > >
> > > > That fix looks like it's specific to permitting the use of versions
> of
> > > gcc
> > > > not supported by CUDA, right?
> > > >
> > >
> > > Hi,
> > >
> > > Not as far as I know.
> > > I am running a fairly vanilla Kubuntu 16.10, with gcc and
> nvidia-cuda-dev
> > > installed from the Ubuntu repository.
> > >
> > > >> gcc --version
> > > gcc (Ubuntu 5.3.1-14ubuntu2) 5.3.1 20160413
> > >
> > > My /usr/include/host_config.h says:
> > > #if __GNUC__ > 5
> > >
> > > #error -- unsupported GNU version! gcc versions later than 5 are not
> > > supported!
> > >
> > > #endif /* __GNUC__ > 5 */
> > >
> > > cheers
> > >
> > > Sjoerd
> > > --
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