[Rcpp-devel] g++ flags

[Martyn Plummer]

On Tue, 2014-05-06 at 22:50 -0700, Kevin Ushey wrote:
> Hi Gabor,
> 
> Looks like it was a bug on our end -- R-exts specifies that USE_CXX1X
> should be set to any value; we try to set it to nothing (ie, define it
> but leave it empty) but apparently that is not accepted.

Yes it is. We use Sys.getenv("USE_CXX1X", NA) to distinguish the case
where USE_CXX1X is set to an empty string (as you did) from the case
where it is unset. So I don't know why this isn't working for you.

The relevant code is src/library/tools/R/install.R.

Martyn

> I just pushed a bug fix to GitHub and it works on my Windows VM; can
> you give it another shot?
> 
> Thanks,
> Kevin
> 
> On Tue, May 6, 2014 at 9:09 PM, Gabor Grothendieck
> <ggrothendieck at gmail.com> wrote:
> > On Windows with R 3.1 I installed the latest Rcpp from github and did
> > the following but the compliation gave an error which was was due to
> > the C++11 constructs.  If I rerun it but uncomment the Sys.setenv line
> > then it works. What do I do to get the cpp11 attribute to work?
> >
> > library(Rcpp)
> > # Sys.setenv("PKG_CXXFLAGS"="-std=c++0x")
> > cat('
> > // [[Rcpp::plugins("cpp11")]]
> > // [[Rcpp::export]]
> > int useCpp11() {
> >     auto x = 10;
> >     return x;
> > }
> > ', file = "testauto.cpp")
> > sourceCpp("testauto.cpp")
> >
> > On Wed, Apr 30, 2014 at 11:12 AM, Dirk Eddelbuettel <edd at debian.org> wrote:
> >>
> >> On 30 April 2014 at 10:05, Dirk Eddelbuettel wrote:
> >> |
> >> | On 30 April 2014 at 10:41, JJ Allaire wrote:
> >> | | I think that might be overkill (or something that we can do later if users ask
> >> | | for it).
> >> |
> >> | It is a one-liner, and it just sits there to be used, like OpenMP plugin.
> >> |
> >> | So in that sense it doesn't hurt, and it may yet help those for which both R
> >> | < 3.1.0 and Windows are true.
> >>
> >> Actually, as Gabor points out, where 'R < 3.1.0' and 'g++ < 4.7' which may
> >> also be a bunch of servers running older RHEL or Ubuntu LTS.
> >>
> >> Dirk
> >>
> >> --
> >> Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com
> >> _______________________________________________
> >> Rcpp-devel mailing list
> >> Rcpp-devel at lists.r-forge.r-project.org
> >> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
> >
> >
> >
> > --
> > Statistics & Software Consulting
> > GKX Group, GKX Associates Inc.
> > tel: 1-877-GKX-GROUP
> > email: ggrothendieck at gmail.com
> > _______________________________________________
> > Rcpp-devel mailing list
> > Rcpp-devel at lists.r-forge.r-project.org
> > https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
> _______________________________________________
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