[Rd] R 3.4 has broken C++11 support

[Martyn Plummer]

A user with the email address flying-sheep at web.de has submitted a bug
report on this topic. 

https://bugs.r-project.org/bugzilla/show_bug.cgi?id=17260

Assuming that you are the same person, I will address the issue here
first.

If you get the message “C++11 standard requested but CXX11 is not
defined” then this means that there is no available C++11 compiler on
your computer. The presence or absence of a working C++11 compiler is
determined at configure time when R is built.

The tests used by R's configure script to determine C++11 support are
more stringent in R 3.4.0 than in previous versions. However, if you
are using gcc you should be protected against this change. For versions
of gcc prior to 4.8 (which have only partial C++11 support) the same
tests as in R 3.3.x are used. This maintains the current behaviour on
long-term service Linux distributions that are stuck with old gcc
versions.

It would be help if you could share more information about your
platform - i.e. the output of sessionInfo() - and specify the compiler
version you are using.

Martyn

On Tue, 2017-04-18 at 15:11 +0200, Angerer, Philipp via R-devel wrote:
> 
> Hi, 
> 
> This commit (I’m using the mirror to have a working link) broke C++11
> compilation. 
> 
> Before (and still now, according to the comments in the configure
> script), it’s sufficient to just have “SystemRequirements: C++11” in
> the DESCRIPTION file. 
> 
> 
> But now “R CMD install” fails with “C++11 standard requested but
> CXX11 is not defined”, which is, according to the documentation , a
> lie. 
> 
> I can’t even circumvent this, as setting “CXX11=$(CXX)” in the
> src/Makevars file fails with “CXX definition recursive”, and
> hardcoding “CXX11=g++” is a bad idea. 
> 
> Did I do sth. wrong or is the C++11 support in R just broken atm.? 
> 
> 
> Best, Philipp 
> 
> PS: After addressing all points in the submission of my popular
> package “IRkernel”, I didn’t get any feedback, and the file just
> vanished from the incoming directory in CRAN. I asked about it
> multiple times but got no answer. What can I do now? 
> 
>  
> 
> 
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