[R-sig-Debian] Ubuntu 16.10 Yakkety Yak uses GCC 6 but -std=c++98 is missing

Dirk Eddelbuettel edd at debian.org
Sun Nov 13 00:41:13 CET 2016

On 13 November 2016 at 00:13, Kirill Müller wrote:
| On 13.11.2016 00:00, Dirk Eddelbuettel wrote:
| > On 12 November 2016 at 22:54, Kirill Müller wrote:
| >
| > [... lots of stuff deleted ...]
| >
| > | I noticed this because plogr logging crashed in dplyr (compiled with gcc
| > | 6) right after upgrading to yakkety; I still had a gcc-5 built version
| > | of Rcpp installed. As soon as I added -std, everything worked as before.
| > | No minimal example, sorry. Don't we need "-std=c++98" in Makevars
| > | anyway, even if it's just to avoid users using C++11 constructs and then
| > | wondering why their packages fail on CRAN?
| >
| > There is still no minimally preproducible example here; just a (pardon me
| > here) rambling description of a hasty system upgrade.
| >
| > It is _somewhat common_ to have to recompile C++ shared objects when compiler
| > major versions change.
| >
| > So I am unsure if we have actually demonstrated a bug here.
| Don't we need "-std=c++98" for GCC 6 in Makevars anyway, even if it's 
| just to save users from using C++11 constructs and then wondering why 
| their packages fail on CRAN/winbuilder? In my case it also saves me from 
| recompiling "all of CRAN" (at least for now); that's a nice side effect, 
| but the first part also looks important to me.

It's a fair, and open, question.

We may, and then we may get away with not rebuilding; or we may not, but then
have to pay by rebuilding all.

I am somewhat surprised I haven't been asked to rebuild Debian packages.
There too we do have binary depends on C++ packages from CRAN, ie r-cran-rcpp
and r-cran-dplyr and whatnot.  But then ... then Debian archive managers now
just do 'binary rebuilds' as needed and I may be out of the loop.

Sorry but I just don't have much better information. There are Debian Wiki
pages on g++ transitions...


http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org

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