* installing *source* package ‘gpboost’ ...
** this is package ‘gpboost’ version ‘1.6.0’
** using staged installation
checking location of R... /home/hornik/tmp/R
checking whether MM_PREFETCH works... yes
checking whether MM_MALLOC works... yes
configure: creating ./config.status
config.status: creating src/Makevars
** libs
using C compiler: ‘Debian clang version 19.1.7 (3+b1)’
using C++ compiler: ‘Debian clang version 19.1.7 (3+b1)’
using C++17
clang++-19 -std=gnu++17 -I"/home/hornik/tmp/R/include" -DNDEBUG -I./include -DEIGEN_MPL2_ONLY -DMM_PREFETCH=1 -DMM_MALLOC=1 -DUSE_SOCKET -DLGB_R_BUILD  -I/usr/local/include -DUSE_TYPE_CHECKING_STRICT -D_FORTIFY_SOURCE=3   -pthread -fpic  -g -O3 -Wall -pedantic -Wno-missing-template-arg-list-after-template-kw -Wdeprecated-literal-operator  -c boosting/boosting.cpp -o boosting/boosting.o
In file included from boosting/boosting.cpp:7:
In file included from boosting/dart.hpp:16:
In file included from boosting/gbdt.h:10:
In file included from ./include/LightGBM/objective_function.h:9:
In file included from ./include/GPBoost/re_model.h:12:
In file included from ./include/GPBoost/type_defs.h:20:
In file included from ./include/Eigen/Sparse:26:
In file included from ./include/Eigen/SparseCore:61:
./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 boosting/boosting.cpp:7:
In file included from boosting/dart.hpp:16:
In file included from boosting/gbdt.h:10:
In file included from ./include/LightGBM/objective_function.h:9:
In file included from ./include/GPBoost/re_model.h:12:
In file included from ./include/GPBoost/type_defs.h:20:
In file included from ./include/Eigen/Sparse:29:
In file included from ./include/Eigen/SparseLU:35:
./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 
      |         ^
./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 boosting/boosting.cpp:7:
In file included from boosting/dart.hpp:16:
In file included from boosting/gbdt.h:10:
In file included from ./include/LightGBM/objective_function.h:9:
In file included from ./include/GPBoost/re_model.h:13:
In file included from ./include/GPBoost/re_model_template.h:15:
In file included from ./include/GPBoost/re_comp.h:13:
./include/GPBoost/cov_fcts.h:2098:11: warning: unused variable 'range_dist' [-Wunused-variable]
 2098 |                         double range_dist = cm_dist * dist_ij;
      |                                ^~~~~~~~~~
./include/GPBoost/cov_fcts.h:2181:212: error: use of undeclared identifier 'cov_fct_type'; did you mean 'cov_fct_type_'?
 2181 |                                 Log::REFatal("'shape' of %g is not supported for the '%s' covariance function (only 0.5, 1.5, and 2.5) when using this compiler (e.g. Clang on Mac). Use gcc or (a newer version of) MSVC instead. ", pars[4], cov_fct_type.c_str());
      |                                                                                                                                                                                                                                                ^~~~~~~~~~~~
      |                                                                                                                                                                                                                                                cov_fct_type_
./include/GPBoost/cov_fcts.h:2307:12: note: 'cov_fct_type_' declared here
 2307 |                 string_t cov_fct_type_;
      |                          ^
In file included from boosting/boosting.cpp:7:
In file included from boosting/dart.hpp:16:
In file included from boosting/gbdt.h:10:
In file included from ./include/LightGBM/objective_function.h:9:
In file included from ./include/GPBoost/re_model.h:13:
In file included from ./include/GPBoost/re_model_template.h:19:
./include/GPBoost/likelihoods.h:2300:12: warning: variable 'grad_dot_direction' set but not used [-Wunused-but-set-variable]
 2300 |                                 double grad_dot_direction = 0.;//for Armijo check
      |                                        ^
In file included from boosting/boosting.cpp:7:
In file included from boosting/dart.hpp:16:
In file included from boosting/gbdt.h:10:
In file included from ./include/LightGBM/objective_function.h:9:
In file included from ./include/GPBoost/re_model.h:13:
./include/GPBoost/re_model_template.h:9268:10: warning: variable 'counter' set but not used [-Wunused-but-set-variable]
 9268 |                                         int counter = 0;
      |                                             ^
./include/GPBoost/re_model_template.h:10148:42: warning: expression result unused [-Wunused-value]
 10148 |                                 re_comp_cross_cov_cluster_i_pred_ip->coords_;
       |                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
7 warnings and 1 error generated.
make: *** [/home/hornik/tmp/R/etc/Makeconf:209: boosting/boosting.o] Error 1
ERROR: compilation failed for package ‘gpboost’
* removing ‘/srv/hornik/tmp/CRAN_pretest/gpboost.Rcheck/gpboost’