* installing *source* package ‘GpGp’ ... ** this is package ‘GpGp’ version ‘1.0.0’ ** using staged installation ** libs using C++ compiler: ‘g++-15 (Debian 15.2.0-11) 15.2.0’ g++-15 -std=gnu++17 -I"/home/hornik/tmp/R-d-gcc-15/include" -DNDEBUG -I'/home/hornik/lib/R/Library/4.6/x86_64-linux-gnu/Rcpp/include' -I'/home/hornik/tmp/CRAN_recheck/Library/RcppArmadillo/include' -I'/home/hornik/lib/R/Library/4.6/x86_64-linux-gnu/BH/include' -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3 -fopenmp -fpic -g -O2 -Wall -pedantic -mtune=native -c RcppExports.cpp -o RcppExports.o g++-15 -std=gnu++17 -I"/home/hornik/tmp/R-d-gcc-15/include" -DNDEBUG -I'/home/hornik/lib/R/Library/4.6/x86_64-linux-gnu/Rcpp/include' -I'/home/hornik/tmp/CRAN_recheck/Library/RcppArmadillo/include' -I'/home/hornik/lib/R/Library/4.6/x86_64-linux-gnu/BH/include' -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3 -fopenmp -fpic -g -O2 -Wall -pedantic -mtune=native -c matrix_mult.cpp -o matrix_mult.o g++-15 -std=gnu++17 -I"/home/hornik/tmp/R-d-gcc-15/include" -DNDEBUG -I'/home/hornik/lib/R/Library/4.6/x86_64-linux-gnu/Rcpp/include' -I'/home/hornik/tmp/CRAN_recheck/Library/RcppArmadillo/include' -I'/home/hornik/lib/R/Library/4.6/x86_64-linux-gnu/BH/include' -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3 -fopenmp -fpic -g -O2 -Wall -pedantic -mtune=native -c vecchia_loglik_grad_info.cpp -o vecchia_loglik_grad_info.o In file included from covmatrix_funs.h:9, from onepass.h:8, from vecchia_loglik_grad_info.cpp:8: covmatrix_funs_01.h: In function ‘arma::cube d_exponential_isotropic(arma::vec, arma::mat)’: covmatrix_funs_01.h:108:27: warning: comparison of integer expressions of different signedness: ‘int’ and ‘const arma::uword’ {aka ‘const unsigned int’} [-Wsign-compare] 108 | for(int j=0; j