Found the following significant warnings:
  FBFsearch.cpp:164:17: warning: ‘bool arma::is_finite(eT, const typename arma_scalar_only<eT>::result*) [with eT = double; typename arma_scalar_only<eT>::result = double]’ is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  FBFsearch.cpp:229:17: warning: ‘bool arma::is_finite(eT, const typename arma_scalar_only<eT>::result*) [with eT = double; typename arma_scalar_only<eT>::result = double]’ is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  FBFsearch.cpp:318:27: warning: ‘static out_eT arma::conv_to<out_eT>::from(const arma::Base<eT2, expr>&, const typename arma::arma_not_cx<in_eT>::result*) [with in_eT = double; T1 = arma::eGlue<arma::Mat<double>, arma::Glue<arma::Op<arma::Mat<double>, arma::op_htrans>, arma::Col<double>, arma::glue_times>, arma::eglue_minus>; out_eT = double; typename arma::arma_not_cx<in_eT>::result = double]’ is deprecated: replace conv_to<...>::from(X) with as_scalar(X) [-Wdeprecated-declarations]
  FBFsearch.cpp:320:45: warning: ‘static out_eT arma::conv_to<out_eT>::from(const arma::Base<eT2, expr>&, const typename arma::arma_not_cx<in_eT>::result*) [with in_eT = double; T1 = arma::subview_elem1<double, arma::Mat<unsigned int> >; out_eT = double; typename arma::arma_not_cx<in_eT>::result = double]’ is deprecated: replace conv_to<...>::from(X) with as_scalar(X) [-Wdeprecated-declarations]
  FBFsearch.cpp:321:25: warning: ‘static out_eT arma::conv_to<out_eT>::from(const arma::Base<eT2, expr>&, const typename arma::arma_not_cx<in_eT>::result*) [with in_eT = unsigned int; T1 = arma::Mat<unsigned int>; out_eT = long unsigned int; typename arma::arma_not_cx<in_eT>::result = unsigned int]’ is deprecated: replace conv_to<...>::from(X) with as_scalar(X) [-Wdeprecated-declarations]
  FBFsearch.cpp:326:30: warning: ‘static out_eT arma::conv_to<out_eT>::from(const arma::Base<eT2, expr>&, const typename arma::arma_not_cx<in_eT>::result*) [with in_eT = double; T1 = arma::subview_elem1<double, arma::Mat<unsigned int> >; out_eT = double; typename arma::arma_not_cx<in_eT>::result = double]’ is deprecated: replace conv_to<...>::from(X) with as_scalar(X) [-Wdeprecated-declarations]
  FBFsearch.cpp:340:21: warning: ‘typename arma::arma_real_only<T>::result arma::log_add(eT, eT) [with eT = double; typename arma_real_only<T>::result = double]’ is deprecated [-Wdeprecated-declarations]
  FBFsearch.cpp:341:21: warning: ‘typename arma::arma_real_only<T>::result arma::log_add(eT, eT) [with eT = double; typename arma_real_only<T>::result = double]’ is deprecated [-Wdeprecated-declarations]
  FBFsearch.cpp:357:36: warning: ‘static out_eT arma::conv_to<out_eT>::from(const arma::Base<eT2, expr>&, const typename arma::arma_not_cx<in_eT>::result*) [with in_eT = double; T1 = arma::Mat<double>; out_eT = double; typename arma::arma_not_cx<in_eT>::result = double]’ is deprecated: replace conv_to<...>::from(X) with as_scalar(X) [-Wdeprecated-declarations]
  FBFsearch.cpp:362:28: warning: ‘static out_eT arma::conv_to<out_eT>::from(const arma::Base<eT2, expr>&, const typename arma::arma_not_cx<in_eT>::result*) [with in_eT = double; T1 = arma::eGlue<arma::Mat<double>, arma::Glue<arma::Op<arma::Mat<double>, arma::op_htrans>, arma::Col<double>, arma::glue_times>, arma::eglue_minus>; out_eT = double; typename arma::arma_not_cx<in_eT>::result = double]’ is deprecated: replace conv_to<...>::from(X) with as_scalar(X) [-Wdeprecated-declarations]
  FBFsearch.cpp:376:16: warning: ‘bool arma::is_finite(eT, const typename arma_scalar_only<eT>::result*) [with eT = double; typename arma_scalar_only<eT>::result = double]’ is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  FBFsearch.cpp:429:32: warning: ‘static out_eT arma::conv_to<out_eT>::from(const arma::Base<eT2, expr>&, const typename arma::arma_not_cx<in_eT>::result*) [with in_eT = double; T1 = arma::Mat<double>; out_eT = double; typename arma::arma_not_cx<in_eT>::result = double]’ is deprecated: replace conv_to<...>::from(X) with as_scalar(X) [-Wdeprecated-declarations]
  FBFsearch.cpp:436:24: warning: ‘typename arma::arma_real_only<T>::result arma::log_add(eT, eT) [with eT = double; typename arma_real_only<T>::result = double]’ is deprecated [-Wdeprecated-declarations]
  FBFsearch.cpp:439:41: warning: ‘typename arma::arma_real_only<T>::result arma::log_add(eT, eT) [with eT = double; typename arma_real_only<T>::result = double]’ is deprecated [-Wdeprecated-declarations]
  FBFsearch.cpp:445:25: warning: ‘typename arma::arma_real_only<T>::result arma::log_add(eT, eT) [with eT = double; typename arma_real_only<T>::result = double]’ is deprecated [-Wdeprecated-declarations]
  FBFsearch.cpp:460:18: warning: ‘eT arma::Mat<eT>::max(arma::uword&) const [with eT = double; arma::uword = unsigned int]’ is deprecated: use .index_max() instead [-Wdeprecated-declarations]
  FBFsearch.cpp:472:18: warning: ‘bool arma::is_finite(const Base<typename T1::elem_type, T1>&) [with T1 = Mat<double>; typename T1::elem_type = double]’ is deprecated: change arma::is_finite(X) to X.is_finite() [-Wdeprecated-declarations]
  FBFsearch.cpp:498:18: warning: ‘eT arma::Mat<eT>::max(arma::uword&) const [with eT = double; arma::uword = unsigned int]’ is deprecated: use .index_max() instead [-Wdeprecated-declarations]
  FBFsearch.cpp:514:36: warning: ‘static out_eT arma::conv_to<out_eT>::from(const arma::Base<eT2, expr>&, const typename arma::arma_not_cx<in_eT>::result*) [with in_eT = double; T1 = arma::Mat<double>; out_eT = double; typename arma::arma_not_cx<in_eT>::result = double]’ is deprecated: replace conv_to<...>::from(X) with as_scalar(X) [-Wdeprecated-declarations]
  FBFsearch.cpp:521:28: warning: ‘typename arma::arma_real_only<T>::result arma::log_add(eT, eT) [with eT = double; typename arma_real_only<T>::result = double]’ is deprecated [-Wdeprecated-declarations]
  FBFsearch.cpp:524:45: warning: ‘typename arma::arma_real_only<T>::result arma::log_add(eT, eT) [with eT = double; typename arma_real_only<T>::result = double]’ is deprecated [-Wdeprecated-declarations]
  FBFsearch.cpp:637:25: warning: ‘typename arma::arma_real_only<T>::result arma::log_add(eT, eT) [with eT = double; typename arma_real_only<T>::result = double]’ is deprecated [-Wdeprecated-declarations]
  FBFsearch.cpp:706:22: warning: ‘typename arma::arma_real_only<T>::result arma::log_add(eT, eT) [with eT = double; typename arma_real_only<T>::result = double]’ is deprecated [-Wdeprecated-declarations]
  FBFsearch.cpp:799:23: warning: ‘typename arma::arma_real_only<T>::result arma::log_add(eT, eT) [with eT = double; typename arma_real_only<T>::result = double]’ is deprecated [-Wdeprecated-declarations]
See ‘/home/hornik/tmp/R.check/r-patched-gcc/Work/PKGS/FBFsearch.Rcheck/00install.out’ for details.
* used C compiler: ‘gcc-14 (Debian 14.3.0-8) 14.3.0’
* used C++ compiler: ‘g++-14 (Debian 14.3.0-8) 14.3.0’