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

[Szilárd Páll]

On Tue, May 10, 2016 at 6:32 PM, Mark Abraham <mark.j.abraham at gmail.com>
wrote:

> 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.


I'd say that's the other way around: NVIDIA is unwilling to release updates
to their compiler, creating lots of incompatibility issues.


> Distros are normally unwilling to
> ship with more than one system compiler,


Depends how you define "system", gcc 4.7-5 are available in the universe
repositories.


> 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.
>

That would be a quite useful things to know; i can look at it but not later
than the end of this week or next week. Can anyone else test?

--
Szilárd


> 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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