[Rcpp-devel] C++11 in Windows R package

[Dirk Eddelbuettel]

Hi John,

On 29 May 2014 at 15:45, John Buonagurio wrote:
| Dirk and Matteo,
| 
| This is a MinGW issue, which as far as I can tell is undocumented.
| 
| When CXX_STD=CXX11 is added to Makevars.win, R ultimately translates this to "-std=c++0x" in the g++ command (via CXX1XSTD in Makeconf). For some reason, MinGW then #undefs WIN32. This doesn't happen using use "-std=gnu++0x"
| 
| You can work around this by checking for _WIN32 instead of WIN32, or just add another define:
| 
| #ifdef _WIN32
| #define WIN32
| #endif

Nice work. That is very, very good.  I had gone to my default page over at

    http://sourceforge.net/p/predef/wiki/Home/

(which is an excellent resource for these things) and got a reminder that the
"official" one is indeed _WIN32 (with underscore).   However, R internally
uses WIN32 so I picked that too.  

Your suggestion will provide a fallback.
 
| But, as you saw even with this fixed, Armadillo still has issues with the Rtools GCC...

That's the well-know problem with the toolchain we have imposed on us.  We'll
have to see how we can adjust.   At least it is gcc/g++ 4.6.* and not 4.2.*
as it was on Windows for many years (and still is on older OS X machines).

Dirk

| 
| Best,
| John
| 
| | -----Original Message-----
| | From: rcpp-devel-bounces at lists.r-forge.r-project.org [mailto:rcpp-devel-
| | bounces at lists.r-forge.r-project.org] On Behalf Of Dirk Eddelbuettel
| | Sent: Thursday, May 29, 2014 9:32 AM
| | To: Matteo Fasiolo
| | Cc: rcpp-devel at lists.r-forge.r-project.org
| | Subject: Re: [Rcpp-devel] C++11 in Windows R package
| | 
| | 
| | On 29 May 2014 at 14:27, Matteo Fasiolo wrote:
| | |  hopefully this is what you meant: I have searched the sources of
| | | RcppArmadillo, Rcpp and R-3.1.0 for the string "#undef WIN32", but I
| | | didn't find anything.
| | |
| | | I used for example: grep -rnw 'RcppArmadillo' -e '#undef WIN32'
| | 
| | I was just on the commuter train, did the same and didn't see it either.
| | 
| | But here is another idea: add    -DWIN32   in src/Makevars.win.  Maybe that
| | definition "survives" and you end up in the right branch.
| | 
| | Dirk
| | 
| | --
| | Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com
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-- 
Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com