Windows machines should define CXX14 and CXX14STD

[DavisVaughan]

R packages requiring C++14 currently do not pass on rhub, but do pass on win-builder. Even though both use RTools34, on win-builder CXX14 and CXX14STD are defined. That prevents you from getting this error, which you do get on rhub:

C++14 standard requested but CXX14 is not defined

The suggestions from Jeroen is to set the following in ~/.R/Makevars.win (or is it just ~/.R/Makevars? I'm not sure):

• CXX14 = g++
• CXX14STD = -std=gnu++1y
• We are not sure about gnu++1y, which win-builder might be setting to gnu++14 instead, but I think either will work.

See this issue for a little bit more information: https://github.com/r-windows/r-testing/issues/1#issue-379473228

[gaborcsardi]

@jeroen would it make sense to set these by default in the Windows build?

[jeroen]

Yes I think it makes sense to mimic what Cran does. You need the same think for the rstan package.

On Wed, Jul 17, 2019, 23:21 Gábor Csárdi [email protected] wrote:

@jeroen https://github.com/jeroen would it make sense to set these by default in the Windows build?

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[gaborcsardi]

@jeroen Sorry, what I mean is to set it up in the Windows installer by default? If windows packages are built by rtools, and rtools supports this, then why not set it in the default Makevars?

[jeroen]

This is up to r-core, not me. But the c++14 support in gcc 4.9.3 is incomplete so that's probably why it isn't advertised. Some things work but some other features do not.

[BINBINCC]

Please in Linux，how to define CXX14 and CXX14STD

[gaborcsardi]

Can these set via environment variables?

[gaborcsardi]

This issue is about the previous R-hub system, it does not apply to the new system, so I am closing it now. Please see https://r-hub.github.io/rhub/ for the new system, R-hub v2.