* installing to library ‘/home/hornik/tmp/R.check/r-devel-gcc/Work/build/Packages’ * installing *source* package ‘RiemBase’ ... ** package ‘RiemBase’ successfully unpacked and MD5 sums checked ** using staged installation ** libs using C++ compiler: ‘g++-13 (Debian 13.2.0-23) 13.2.0’ using C++11 make[1]: Entering directory '/home/hornik/tmp/scratch/RtmpkRMDH8/R.INSTALL1747f3504ef980/RiemBase/src' g++-13 -std=gnu++11 -I"/home/hornik/tmp/R.check/r-devel-gcc/Work/build/include" -DNDEBUG -I../inst/include -I'/home/hornik/tmp/R.check/r-devel-gcc/Work/build/Packages/Rcpp/include' -I'/home/hornik/tmp/R.check/r-devel-gcc/Work/build/Packages/RcppArmadillo/include' -I/usr/local/include -D_FORTIFY_SOURCE=3 -fopenmp -fpic -g -O2 -Wall -pedantic -mtune=native -c RcppExports.cpp -o RcppExports.o g++-13 -std=gnu++11 -I"/home/hornik/tmp/R.check/r-devel-gcc/Work/build/include" -DNDEBUG -I../inst/include -I'/home/hornik/tmp/R.check/r-devel-gcc/Work/build/Packages/Rcpp/include' -I'/home/hornik/tmp/R.check/r-devel-gcc/Work/build/Packages/RcppArmadillo/include' -I/usr/local/include -D_FORTIFY_SOURCE=3 -fopenmp -fpic -g -O2 -Wall -pedantic -mtune=native -c engines.cpp -o engines.o In file included from ../inst/include/riemfactory.hpp:11, from engines.cpp:2: ../inst/include/manifolds/riem_04stiefel.h: In function ‘arma::mat stiefel_exp(arma::mat, arma::mat, double)’: ../inst/include/manifolds/riem_04stiefel.h:88:13: warning: unused variable ‘n’ [-Wunused-variable] 88 | const int n = x.n_rows; | ^ ../inst/include/manifolds/riem_04stiefel.h: In function ‘arma::mat stiefel_log(arma::mat, arma::mat)’: ../inst/include/manifolds/riem_04stiefel.h:108:13: warning: unused variable ‘n’ [-Wunused-variable] 108 | const int n = U0.n_rows; | ^ ../inst/include/manifolds/riem_04stiefel.h: In function ‘arma::mat stiefel_invretr(arma::mat, arma::mat)’: ../inst/include/manifolds/riem_04stiefel.h:168:7: warning: unused variable ‘n’ [-Wunused-variable] 168 | int n = x.n_rows; | ^ In file included from ../inst/include/riemfactory.hpp:12: ../inst/include/manifolds/riem_05grassmann.h: In function ‘double grassmann_dist(arma::mat, arma::mat)’: ../inst/include/manifolds/riem_05grassmann.h:34:17: warning: comparison of integer expressions of different signedness: ‘int’ and ‘const arma::uword’ {aka ‘const unsigned int’} [-Wsign-compare] 34 | for (int i=0;i