[Rcpp-devel] Conflict of std::asin and std::tr1::asin while using RcppArmadillo

[Dirk Eddelbuettel]

Robin,

On 22 June 2016 at 12:11, Robin Girard wrote:
| Dear Rcpp experts, 
| 
| I'm using RcppArmadillo and I'm facing a conflict on the asin, acos, atan and fabs functions I hardly manage to understand (the conflict appears under linux but not under windows)  
| 
| - -------- My header looks like this : 

I _complete and self-contained_ example would help us.  Nobody can really
help with the partial snippet below.
 
| #define ARMA_DONT_USE_CXX11
| #include "R.h" // R functions
| 
| #include <RcppArmadillo.h>
| #include <assert.h>
| 
| #include <netcdf>
| #include <cstdlib>
| #include <cstring>
| #include <iostream>
| #include <solar_geometry.h>
| #include <clsmodel.h>
| using namespace Rcpp;
| using namespace RcppArmadillo;
| //
| using namespace netCDF;
| using namespace netCDF::exceptions;
| 
| ---------- the compilation runs like this 
| g++ -m64 -I/usr/include/R -DNDEBUG -std=c++0x -I../inst/include/ -I/usr/include /usr/local/include -I"/usr/lib64/R/include" -I/usr/local/include -I"/usr/lib64/R/library/RcppArmadillo/include" -I"/usr/lib64/R/library/Rcpp/include"  `/usr/lib64/R/bin/Rscript -e "Rcpp:::CxxFlags()"`  `pkg-config --cflags netcdf` /usr/local/include -fopenmp -lnetcdf -lnetcdf.7 -lnetcdf_c++4 -lsolar_geometry -lclsmodel -fpic  -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic  -c Module.cc -o Module.o
| 
| 
| 
| ---------- and the error message has 
| In file included from /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/tr1/complex:47,

I would start by trying a compiler from this decade.

The g++ 4.4.7 release on these older RedHat machines is getting long in the
tooth.  In fact, the _current_ RcppArmadillo release (on CRAN, as well as on
GitHub) even tests for versions that old and _dies in error_ if 4.4 or 4.5 is
found.

So try g++ 4.6, better still 4.8/4.9 or a 5* variant.  If you can't then you
may have to use (Rcpp)Armadillo versions from that timeframe.  

Dirk


|                  from /usr/lib64/R/library/RcppArmadillo/include/armadillo:74,
|                  from /usr/lib64/R/library/RcppArmadillo/include/RcppArmadilloForward.h:46,
|                  from /usr/lib64/R/library/RcppArmadillo/include/RcppArmadillo.h:30,
|                  from ../inst/include/FluctRES.h:18,
|                  from Module.cc:9:
| /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/tr1_impl/complex:40: error: ‘template<class _Tp> std::complex<_Tp> std::tr1::acos(const std::complex<_Tp>&)’ conflicts with previous using declaration ‘template<class _Tp> std::complex<_Tp> std::acos(const std::complex<_Tp>&)’
| 
| 
| --- 
| I tried to call std::acos ... instead of acos in my code but the error is still here. Sorry that my example is not really "elementary" and I hope I'm on the right list.. 
| I guess I'm including twice something by wrong use of using namespace and I saw that #define ARMA_DONT_USE_CXX11 implies the load of     #include <tr1/complex> (in file armadillo)
| 
| Is any help possible from this mailing list ? 
| Thanks in advance 
| Best regards
| Robin 
| 
| 
| Dr. Girard Robin
| Chargé de Recherche
| 
| MINES-ParisTech /PSL Research University/ Département Energétique et Procédés / PERSEE / Groupe ERSEI
| Centre Procédés, Energies Renouvelables et Systèmes Energétiques (PERSEE)
| Center for Processes, Renewables Energies and Energy Systems
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| 
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| 
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