* installing *source* package ‘N2R’ ...
** this is package ‘N2R’ version ‘1.0.5’
** using staged installation
** libs
using C++ compiler: ‘Debian clang version 21.1.8 (3+b1)’
clang++-21 -std=gnu++20 -I"/home/hornik/tmp/R-d-clang-21/include" -DNDEBUG  -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/Rcpp/include' -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/BH/include' -I'/srv/hornik/tmp/CRAN_pretest/Library/RcppSpdlog/include' -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include' -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3  -I"../inst/include" -I"./n2/include"   -fpic  -g -O3 -Wall -pedantic   -c RcppExports.cpp -o RcppExports.o
In file included from RcppExports.cpp:4:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/Sparse:26:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/SparseCore:61:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseCore/TriangularSolver.h:273:13: warning: variable 'count' set but not used [-Wunused-but-set-variable]
  273 |       Index count = 0;
      |             ^
In file included from RcppExports.cpp:4:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/Sparse:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/SparseLU:35:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseLU/SparseLU_heap_relax_snode.h:78:9: warning: variable 'nsuper_et_post' set but not used [-Wunused-but-set-variable]
   78 |   Index nsuper_et_post = 0; // Number of relaxed snodes in postordered etree 
      |         ^
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseLU/SparseLU_heap_relax_snode.h:79:9: warning: variable 'nsuper_et' set but not used [-Wunused-but-set-variable]
   79 |   Index nsuper_et = 0; // Number of relaxed snodes in the original etree 
      |         ^
In file included from RcppExports.cpp:4:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:31:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/IterativeSolvers:46:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/src/IterativeSolvers/IDRS.h:72:10: warning: variable 'replacements' set but not used [-Wunused-but-set-variable]
   72 |                         Index replacements = 0;
      |                               ^
In file included from RcppExports.cpp:4:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:37:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/SparseExtra:45:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/src/SparseExtra/MarketIO.h:246:7: warning: variable 'count' set but not used [-Wunused-but-set-variable]
  246 |   int count = 0;
      |       ^
5 warnings generated.
clang++-21 -std=gnu++20 -I"/home/hornik/tmp/R-d-clang-21/include" -DNDEBUG  -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/Rcpp/include' -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/BH/include' -I'/srv/hornik/tmp/CRAN_pretest/Library/RcppSpdlog/include' -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include' -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3  -I"../inst/include" -I"./n2/include"   -fpic  -g -O3 -Wall -pedantic   -c check_openmp.cpp -o check_openmp.o
clang++-21 -std=gnu++20 -I"/home/hornik/tmp/R-d-clang-21/include" -DNDEBUG  -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/Rcpp/include' -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/BH/include' -I'/srv/hornik/tmp/CRAN_pretest/Library/RcppSpdlog/include' -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include' -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3  -I"../inst/include" -I"./n2/include"   -fpic  -g -O3 -Wall -pedantic   -c n2knn.cpp -o n2knn.o
In file included from n2knn.cpp:27:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/Sparse:26:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/SparseCore:61:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseCore/TriangularSolver.h:273:13: warning: variable 'count' set but not used [-Wunused-but-set-variable]
  273 |       Index count = 0;
      |             ^
In file included from n2knn.cpp:27:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/Sparse:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/SparseLU:35:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseLU/SparseLU_heap_relax_snode.h:78:9: warning: variable 'nsuper_et_post' set but not used [-Wunused-but-set-variable]
   78 |   Index nsuper_et_post = 0; // Number of relaxed snodes in postordered etree 
      |         ^
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseLU/SparseLU_heap_relax_snode.h:79:9: warning: variable 'nsuper_et' set but not used [-Wunused-but-set-variable]
   79 |   Index nsuper_et = 0; // Number of relaxed snodes in the original etree 
      |         ^
In file included from n2knn.cpp:27:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:31:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/IterativeSolvers:46:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/src/IterativeSolvers/IDRS.h:72:10: warning: variable 'replacements' set but not used [-Wunused-but-set-variable]
   72 |                         Index replacements = 0;
      |                               ^
In file included from n2knn.cpp:27:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:37:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/SparseExtra:45:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/src/SparseExtra/MarketIO.h:246:7: warning: variable 'count' set but not used [-Wunused-but-set-variable]
  246 |   int count = 0;
      |       ^
5 warnings generated.
(cd n2  && CFLAGS="-g -O3 -Wall -pedantic" CXXFLAGS="-g -O3 -Wall -pedantic " MAKE="make -f \"/home/hornik/tmp/R-d-clang-21/etc/Makeconf\" -f Makefile" make -f "/home/hornik/tmp/R-d-clang-21/etc/Makeconf" -f Makefile lib) || exit 1;
make[1]: Entering directory '/srv/hornik/tmp/CRAN_pretest/N2R.Rcheck/00_pkg_src/N2R/src/n2'
clang++-21 -std=gnu++20 -I"/home/hornik/tmp/R-d-clang-21/include" -DNDEBUG  -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/Rcpp/include' -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/BH/include' -I'/srv/hornik/tmp/CRAN_pretest/Library/RcppSpdlog/include' -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include' -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3  -I"./include" -fpic  -g -O3 -Wall -pedantic   -c hnsw.cc -o hnsw.o
In file included from hnsw.cc:14:
In file included from ./include/n2/hnsw.h:47:
In file included from ./include/n2/hnsw_build.h:24:
In file included from ./include/n2/distance.h:22:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/Sparse:26:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/SparseCore:61:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseCore/TriangularSolver.h:273:13: warning: variable 'count' set but not used [-Wunused-but-set-variable]
  273 |       Index count = 0;
      |             ^
In file included from hnsw.cc:14:
In file included from ./include/n2/hnsw.h:47:
In file included from ./include/n2/hnsw_build.h:24:
In file included from ./include/n2/distance.h:22:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/Sparse:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/SparseLU:35:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseLU/SparseLU_heap_relax_snode.h:78:9: warning: variable 'nsuper_et_post' set but not used [-Wunused-but-set-variable]
   78 |   Index nsuper_et_post = 0; // Number of relaxed snodes in postordered etree 
      |         ^
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseLU/SparseLU_heap_relax_snode.h:79:9: warning: variable 'nsuper_et' set but not used [-Wunused-but-set-variable]
   79 |   Index nsuper_et = 0; // Number of relaxed snodes in the original etree 
      |         ^
In file included from hnsw.cc:14:
In file included from ./include/n2/hnsw.h:47:
In file included from ./include/n2/hnsw_build.h:24:
In file included from ./include/n2/distance.h:22:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:31:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/IterativeSolvers:46:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/src/IterativeSolvers/IDRS.h:72:10: warning: variable 'replacements' set but not used [-Wunused-but-set-variable]
   72 |                         Index replacements = 0;
      |                               ^
In file included from hnsw.cc:14:
In file included from ./include/n2/hnsw.h:47:
In file included from ./include/n2/hnsw_build.h:24:
In file included from ./include/n2/distance.h:22:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:37:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/SparseExtra:45:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/src/SparseExtra/MarketIO.h:246:7: warning: variable 'count' set but not used [-Wunused-but-set-variable]
  246 |   int count = 0;
      |       ^
5 warnings generated.
clang++-21 -std=gnu++20 -I"/home/hornik/tmp/R-d-clang-21/include" -DNDEBUG  -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/Rcpp/include' -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/BH/include' -I'/srv/hornik/tmp/CRAN_pretest/Library/RcppSpdlog/include' -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include' -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3  -I"./include" -fpic  -g -O3 -Wall -pedantic   -c hnsw_build.cc -o hnsw_build.o
In file included from hnsw_build.cc:15:
In file included from ./include/n2/hnsw_build.h:24:
In file included from ./include/n2/distance.h:22:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/Sparse:26:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/SparseCore:61:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseCore/TriangularSolver.h:273:13: warning: variable 'count' set but not used [-Wunused-but-set-variable]
  273 |       Index count = 0;
      |             ^
In file included from hnsw_build.cc:15:
In file included from ./include/n2/hnsw_build.h:24:
In file included from ./include/n2/distance.h:22:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/Sparse:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/SparseLU:35:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseLU/SparseLU_heap_relax_snode.h:78:9: warning: variable 'nsuper_et_post' set but not used [-Wunused-but-set-variable]
   78 |   Index nsuper_et_post = 0; // Number of relaxed snodes in postordered etree 
      |         ^
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseLU/SparseLU_heap_relax_snode.h:79:9: warning: variable 'nsuper_et' set but not used [-Wunused-but-set-variable]
   79 |   Index nsuper_et = 0; // Number of relaxed snodes in the original etree 
      |         ^
In file included from hnsw_build.cc:15:
In file included from ./include/n2/hnsw_build.h:24:
In file included from ./include/n2/distance.h:22:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:31:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/IterativeSolvers:46:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/src/IterativeSolvers/IDRS.h:72:10: warning: variable 'replacements' set but not used [-Wunused-but-set-variable]
   72 |                         Index replacements = 0;
      |                               ^
In file included from hnsw_build.cc:15:
In file included from ./include/n2/hnsw_build.h:24:
In file included from ./include/n2/distance.h:22:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:37:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/SparseExtra:45:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/src/SparseExtra/MarketIO.h:246:7: warning: variable 'count' set but not used [-Wunused-but-set-variable]
  246 |   int count = 0;
      |       ^
5 warnings generated.
clang++-21 -std=gnu++20 -I"/home/hornik/tmp/R-d-clang-21/include" -DNDEBUG  -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/Rcpp/include' -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/BH/include' -I'/srv/hornik/tmp/CRAN_pretest/Library/RcppSpdlog/include' -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include' -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3  -I"./include" -fpic  -g -O3 -Wall -pedantic   -c hnsw_search.cc -o hnsw_search.o
In file included from hnsw_search.cc:15:
In file included from ./include/n2/hnsw_search_impl.h:21:
In file included from ./include/n2/distance.h:22:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/Sparse:26:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/SparseCore:61:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseCore/TriangularSolver.h:273:13: warning: variable 'count' set but not used [-Wunused-but-set-variable]
  273 |       Index count = 0;
      |             ^
In file included from hnsw_search.cc:15:
In file included from ./include/n2/hnsw_search_impl.h:21:
In file included from ./include/n2/distance.h:22:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/Sparse:29:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/SparseLU:35:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseLU/SparseLU_heap_relax_snode.h:78:9: warning: variable 'nsuper_et_post' set but not used [-Wunused-but-set-variable]
   78 |   Index nsuper_et_post = 0; // Number of relaxed snodes in postordered etree 
      |         ^
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/Eigen/src/SparseLU/SparseLU_heap_relax_snode.h:79:9: warning: variable 'nsuper_et' set but not used [-Wunused-but-set-variable]
   79 |   Index nsuper_et = 0; // Number of relaxed snodes in the original etree 
      |         ^
In file included from hnsw_search.cc:15:
In file included from ./include/n2/hnsw_search_impl.h:21:
In file included from ./include/n2/distance.h:22:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:31:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/IterativeSolvers:46:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/src/IterativeSolvers/IDRS.h:72:10: warning: variable 'replacements' set but not used [-Wunused-but-set-variable]
   72 |                         Index replacements = 0;
      |                               ^
In file included from hnsw_search.cc:15:
In file included from ./include/n2/hnsw_search_impl.h:21:
In file included from ./include/n2/distance.h:22:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigen.h:25:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/RcppEigenForward.h:37:
In file included from /home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/SparseExtra:45:
/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include/unsupported/Eigen/src/SparseExtra/MarketIO.h:246:7: warning: variable 'count' set but not used [-Wunused-but-set-variable]
  246 |   int count = 0;
      |       ^
5 warnings generated.
clang++-21 -std=gnu++20 -I"/home/hornik/tmp/R-d-clang-21/include" -DNDEBUG  -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/Rcpp/include' -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/BH/include' -I'/srv/hornik/tmp/CRAN_pretest/Library/RcppSpdlog/include' -I'/home/hornik/lib/R/Library/4.7/x86_64-linux-gnu/RcppEigen/include' -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3  -I"./include" -fpic  -g -O3 -Wall -pedantic   -c hnsw_model.cc -o hnsw_model.o
In file included from hnsw_model.cc:15:
./include/n2/hnsw_model.h:70:12: error: no member named 'memcpy' in namespace 'std'; did you mean 'wmemcpy'?
   70 |       std::memcpy(ptr, &val, sizeof(T));
      |            ^~~~~~
      |            wmemcpy
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/cwchar:203:11: note: 'wmemcpy' declared here
  203 |   using ::wmemcpy;
      |           ^
In file included from hnsw_model.cc:15:
./include/n2/hnsw_model.h:76:12: error: no member named 'memcpy' in namespace 'std'; did you mean 'wmemcpy'?
   76 |       std::memcpy(&val, ptr, sizeof(T));
      |            ^~~~~~
      |            wmemcpy
/usr/lib/gcc/x86_64-linux-gnu/15/../../../../include/c++/15/cwchar:203:11: note: 'wmemcpy' declared here
  203 |   using ::wmemcpy;
      |           ^
In file included from hnsw_model.cc:15:
./include/n2/hnsw_model.h:70:19: error: cannot initialize a parameter of type 'wchar_t *' with an lvalue of type 'char *'
   70 |       std::memcpy(ptr, &val, sizeof(T));
      |                   ^~~
hnsw_model.cc:168:11: note: in instantiation of function template specialization 'n2::HnswModel::SetValueAndIncPtr<int>' requested here
  168 |     ptr = SetValueAndIncPtr<int>(ptr, max_level_);
      |           ^
/usr/include/wchar.h:287:46: note: passing argument to parameter '__s1' here
  287 | extern wchar_t *wmemcpy (wchar_t *__restrict __s1,
      |                                              ^
In file included from hnsw_model.cc:15:
./include/n2/hnsw_model.h:70:19: error: cannot initialize a parameter of type 'wchar_t *' with an lvalue of type 'char *'
   70 |       std::memcpy(ptr, &val, sizeof(T));
      |                   ^~~
hnsw_model.cc:171:11: note: in instantiation of function template specialization 'n2::HnswModel::SetValueAndIncPtr<n2::DistanceKind>' requested here
  171 |     ptr = SetValueAndIncPtr<DistanceKind>(ptr, metric_);
      |           ^
/usr/include/wchar.h:287:46: note: passing argument to parameter '__s1' here
  287 | extern wchar_t *wmemcpy (wchar_t *__restrict __s1,
      |                                              ^
In file included from hnsw_model.cc:15:
./include/n2/hnsw_model.h:70:19: error: cannot initialize a parameter of type 'wchar_t *' with an lvalue of type 'char *'
   70 |       std::memcpy(ptr, &val, sizeof(T));
      |                   ^~~
hnsw_model.cc:172:11: note: in instantiation of function template specialization 'n2::HnswModel::SetValueAndIncPtr<unsigned long>' requested here
  172 |     ptr = SetValueAndIncPtr<size_t>(ptr, data_dim_);
      |           ^
/usr/include/wchar.h:287:46: note: passing argument to parameter '__s1' here
  287 | extern wchar_t *wmemcpy (wchar_t *__restrict __s1,
      |                                              ^
In file included from hnsw_model.cc:15:
./include/n2/hnsw_model.h:76:19: error: cannot initialize a parameter of type 'wchar_t *' with an rvalue of type 'int *'
   76 |       std::memcpy(&val, ptr, sizeof(T));
      |                   ^~~~
hnsw_model.cc:192:11: note: in instantiation of function template specialization 'n2::HnswModel::GetValueAndIncPtr<int>' requested here
  192 |     ptr = GetValueAndIncPtr<int>(ptr, max_level_);
      |           ^
/usr/include/wchar.h:287:46: note: passing argument to parameter '__s1' here
  287 | extern wchar_t *wmemcpy (wchar_t *__restrict __s1,
      |                                              ^
In file included from hnsw_model.cc:15:
./include/n2/hnsw_model.h:76:19: error: cannot initialize a parameter of type 'wchar_t *' with an rvalue of type 'n2::DistanceKind *'
   76 |       std::memcpy(&val, ptr, sizeof(T));
      |                   ^~~~
hnsw_model.cc:195:11: note: in instantiation of function template specialization 'n2::HnswModel::GetValueAndIncPtr<n2::DistanceKind>' requested here
  195 |     ptr = GetValueAndIncPtr<DistanceKind>(ptr, metric_);
      |           ^
/usr/include/wchar.h:287:46: note: passing argument to parameter '__s1' here
  287 | extern wchar_t *wmemcpy (wchar_t *__restrict __s1,
      |                                              ^
In file included from hnsw_model.cc:15:
./include/n2/hnsw_model.h:76:19: error: cannot initialize a parameter of type 'wchar_t *' with an rvalue of type 'unsigned long *'
   76 |       std::memcpy(&val, ptr, sizeof(T));
      |                   ^~~~
hnsw_model.cc:200:11: note: in instantiation of function template specialization 'n2::HnswModel::GetValueAndIncPtr<unsigned long>' requested here
  200 |     ptr = GetValueAndIncPtr<size_t>(ptr, data_dim_);
      |           ^
/usr/include/wchar.h:287:46: note: passing argument to parameter '__s1' here
  287 | extern wchar_t *wmemcpy (wchar_t *__restrict __s1,
      |                                              ^
8 errors generated.
make[1]: *** [/home/hornik/tmp/R-d-clang-21/etc/Makeconf:195: hnsw_model.o] Error 1
make[1]: Leaving directory '/srv/hornik/tmp/CRAN_pretest/N2R.Rcheck/00_pkg_src/N2R/src/n2'
make: *** [Makevars:15: sublibraries] Error 1
ERROR: compilation failed for package ‘N2R’
* removing ‘/srv/hornik/tmp/CRAN_pretest/N2R.Rcheck/N2R’