An update on this thread: I successfully compiled a function with the line " #include <boost/multiprecision/eigen.hpp> ". I have also been able to compile a (non-exported) function that gives as an output a "Eigen::Matrix<boost::multiprecision::float128, Eigen::Dynamic, 4>".
However, when I try to export an auxiliary function that casts the float128 into a double, I get an error message saying "RcppExports.cpp:11:108: error: 'boost' was not declared in this scope". So, it seems that in RcppExports, the compiler does not "understand" that boost exists. Since I have not used BH, since BH uses boost 1.66, and only boost 1.68 has the include that combines eigen and boost, I assume that the problem is that, in some unknown way to me, I should tell the compiler that at RcppExports it should use the includes of boost in my cpp file: #include <boost/multiprecision/float128.hpp> #include <boost/multiprecision/eigen.hpp> But RcppExports only have: #include <RcppArmadillo.h>#include <RcppEigen.h>#include <Rcpp.h> What should I do, in order to tell the compiler that in RcppExports, boost should be "understood"? The question has also been posted in stackoverflow, since my initial question was posted there, but I think that rcppdevel is probably a better place to ask this question: https://stackoverflow.com/questions/52964042/boost-is-not-recognized-in-r-when-exporting Best Jordi Molins i Coronado +34 69 38 000 59 On Tue, Oct 23, 2018 at 5:10 PM Jordi Molins < jordi.molins.coron...@gmail.com> wrote: > An update: it really seems the problem was in updating gcc to 8.1. I have > installed Rtools again, and now, following the steps in the link above, I > have been able to successfully compile code with the line " #include > <boost/multiprecision/eigen.hpp> ". I will check now if I can use code > (there is nothing of boost in the code, so far, apart from the include). > > So, my request is not urgent now. Of course, I will be delighted with a > new BH version. > > Jordi Molins i Coronado > +34 69 38 000 59 > > > On Tue, Oct 23, 2018 at 4:19 PM Jordi Molins < > jordi.molins.coron...@gmail.com> wrote: > >> Hello, >> >> I am trying to use eigen and boost at the same time, in R (Windows). The >> reason is that eigen allows now data types such as float128. >> >> What happens is that this link between eigen and boost is new (boost >> 1.68). I believe BH uses boost 1.66. >> >> I received an answer in stackoverflow: >> >> >> https://stackoverflow.com/questions/52871038/using-boost-multiprecision-with-rcppeigen/52887046?noredirect=1#comment92801003_52887046 >> >> of how to install boost 1.68 without needing BH. I have tried to >> implement that solution, but it does not work: I get an error message such >> as >> "c:/rtools/mingw_64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: >> cannot find -lgfortran collect2.exe: error: ld returned 1 exit status". >> And now I do not know how to solve this "cannot find -lgfortran" issue >> (note: this could be entangled with the fact that I substituted the gcc 4.9 >> compiler in Rtools for gcc 8.1, since I could not compile a single >> sourceCpp with gcc 4.9, but yes with gcc 8.1; I can perfectly compile Rcpp >> projects, though). >> >> So, I would like to kindly ask if BH could be updated to boost 1.68. I >> understand that updating BH must be a big work, and we all have many things >> to do. But I see usually BH is updated twice per year, and this year there >> has been one update so far. Also, the union of BH and eigen is possibly a >> source of happiness for this community, since AFAIK, so far BH and eigen >> were completely separated. >> >> Of course, if this request cannot be executed, I am happy too. I am just >> asking in case somebody could do it without too much work, and in fact, he >> was thinking in doing it anyway. >> >> Best regards >> >> Jordi Molins i Coronado >> +34 69 38 000 59 >> >
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