Hi Dirk,
On Fri, 19-06-2015, at 15:04, Dirk Eddelbuettel <e...@debian.org> wrote: > Hi Ramon, > > On 19 June 2015 at 12:01, Ramon Diaz-Uriarte wrote: > | Some of my packages use > | > | SystemRequirements: C++11 > | > | in the DESCRIPTION. But then .R/Makevars seems to be ignored (e.g., flags > | such as -Wall or using clang) in all that concerns C++ (only CXX and > | CXXFLAGS are ignored, not CC or CFLAGS). So I keep commenting that line for > | normal development and uncommenting it for final checking before release. > | > | > | I vaguely remember reading somewhere this is the way things work, but this > | is not what I understand from reading again > | > http://cran.r-project.org/doc/manuals/r-devel/R-exts.html#Using-C_002b_002b11-code. > | > | After googling I have not been able to locate anything, and since I guess > | it is probably common to use both C++11 and a custom .R/Makevars I think > | something is wrong somewhere in my setup. But I have no idea what. I am > | using Debian (a mix of testing and unstable), both with stock Debian R and > | with custom built Rs. > > I settled pretty early on declaring this in src/Makevars only, partly for > historical reason (as it is where we always set compiler flags) and partly > because I found it to be consistent and reliabel. Writing R Extensions > offers an alternate, I forget the details. > > One tricky bit is that we now have several CXX* variables. And because "code > is documentation" I often do the following to remind myself of CXX1X: > > edd@max:~$ grep ^CXX /etc/R/Makeconf > CXX = g++ > CXXCPP = $(CXX) -E > CXXFLAGS = -g -O2 -fstack-protector-strong -Wformat -Werror=format-security > -D_FORTIFY_SOURCE=2 -g $(LTO) > CXXPICFLAGS = -fpic > CXX1X = g++ > CXX1XFLAGS = -g -O2 -fstack-protector-strong -Wformat > -Werror=format-security -D_FORTIFY_SOURCE=2 -g > CXX1XPICFLAGS = -fpic > CXX1XSTD = -std=c++11 Aha! Thanks. I modified them slightly to try it out and have now in .R/Makevars ## If I want clang # CC=clang # CXX=clang++-libc++ # CXX1X=clang++-libc++ CFLAGS= -O3 -g0 -Wall -Wextra -pipe -pedantic -std=gnu99 CXXFLAGS= -isystem /home/ramon/Sources/R-3.2.1-bioc-devel-68530/library/Rcpp/include -g -O3 -Wall -Wextra -pipe -std=c++11 CXX1XFLAGS= -isystem /home/ramon/Sources/R-3.2.1-bioc-devel-68530/library/Rcpp/include -g -O3 -Wall -Wextra -pipe CXX1XSTD= -std=c++11 CXX1XPICFLAGS = -fpic I added a src/Makevars to the package that contains only CXX_STD = CXX11 and everything is working now. I can modify flags at will and change compilers to make sure it works with clang. > edd@max:~$ > > I my most recent C++11-only package I did > > edd@max:~$ cat git/rcpptoml/src/Makevars > > ## This is a C++11 package > CXX_STD = CXX11 > > ## We need the header in inst/include, and a define > PKG_CPPFLAGS = -I../inst/include/ -DCPPTOML_USE_MAP > > edd@max:~$ > > which regroups both the the compiler choice, an include directive and a > #define in one place. Aha! I did not need those right now but it is great to know it is that easy. > > Hope this helps, Dirk It certainly does. Best, R. -- Ramon Diaz-Uriarte Department of Biochemistry, Lab B-25 Facultad de Medicina Universidad Autónoma de Madrid Arzobispo Morcillo, 4 28029 Madrid Spain Phone: +34-91-497-2412 Email: rdia...@gmail.com ramon.d...@iib.uam.es http://ligarto.org/rdiaz ______________________________________________ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
