Rcpp: Support NVCC better?

[eddelbuettel]

Cf email discussion on rcpp-devel in thread titled "NVCC compatibility" started by @cdeterman.

One issue, apparently found first by @jtilly and noted here in his RcppThrust README is that this line need to drop const. Can we just add a non-const version too?

(Typo fixed. Added New Year's Resolution to only copy addresses and never ever type free hand, cf fortunes::fortune("dirk can type"))

[Enchufa2]

Quick comment to ping @jtilly (typo above) and to note that this getter is the only one in that file not qualified as const, which could solve the problem without discarding the other one.

[Enchufa2]

Oh, and consequently, this operator should be qualified as const too.

[cdeterman]

@Enchufa2 I have tried modifying that getter and operator both as const with my own gpuRcuda but the following error is still returned

/usr/local/lib/R/site-library/Rcpp/include/Rcpp/vector/proxy.h(99): error: the object has type qualifiers that are not compatible with the member function "Rcpp::internal::string_name_proxy::get"
object type is: const Rcpp::internal::string_name_proxy

[Enchufa2]

@cdeterman Have you cleaned up before rebuilding and reinstalled correctly? Because I've tried with docker and your package compiles just fine (with warnings, but without error). This is the diff. I can create a pull request if @eddelbuettel agrees.

[eddelbuettel]

Narrow-ish change to one setter / adding one getter as discussed sounds fine to me.

Diff looks good. If you are familiar enough with the format an entry in ChangeLog is always appreciated too.

[Enchufa2]

Fine. I'll prepare a Dockerfile too and append it to the PR, so that you can test it with one command.

[eddelbuettel]

Why would I need a Dockerfile? I tend to just rebuild Rcpp and then use my fancy new parallel rev dep runner to test'em.

[Enchufa2]

I mean, to test that nvcc does not complain anymore.

[eddelbuettel]

Ah, yes. I had created an nvidia-enabled container the other day (see here) but I have my docker binary and nvidia-docker out of sync.

But nvcc is @cdeterman 's problem, I just want to ensure we don't break Rcpp for all :)

[cdeterman]

@Enchufa2 you are correct, I overlooked cleaning up my previous build. Sorry for confusion. The changes in the provided commit indeed do address the error. Thanks for all your help everyone.