Found the following significant warnings:
  R_approx.cpp:71:13: warning: 'is_finite<arma::Mat<double>>' is deprecated: change arma::is_finite(X) to X.is_finite() [-Wdeprecated-declarations]
  R_psi.cpp:201:13: warning: 'is_finite<arma::Mat<double>>' is deprecated: change arma::is_finite(X) to X.is_finite() [-Wdeprecated-declarations]
  approx_mcmc.cpp:120:14: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  approx_mcmc.cpp:236:14: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  approx_mcmc.cpp:276:15: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  approx_mcmc.cpp:1530:14: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  mcmc.cpp:353:14: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  mcmc.cpp:545:14: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  mcmc.cpp:701:14: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  mcmc.cpp:848:14: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_mng.cpp:224:17: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_mng.cpp:364:17: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_mng.cpp:415:17: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_nlg.cpp:69:16: warning: 'is_finite<arma::Mat<double>>' is deprecated: change arma::is_finite(X) to X.is_finite() [-Wdeprecated-declarations]
  model_ssm_nlg.cpp:115:18: warning: 'is_finite<arma::Mat<double>>' is deprecated: change arma::is_finite(X) to X.is_finite() [-Wdeprecated-declarations]
  model_ssm_nlg.cpp:115:57: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_nlg.cpp:134:22: warning: 'is_finite<arma::Mat<double>>' is deprecated: change arma::is_finite(X) to X.is_finite() [-Wdeprecated-declarations]
  model_ssm_nlg.cpp:134:57: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_sde.cpp:34:12: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_sde.cpp:64:32: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:125:17: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:174:19: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:202:19: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:230:17: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:270:15: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:286:15: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:293:13: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:331:15: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:343:15: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:349:13: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:379:15: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:397:15: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:404:13: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:435:15: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:457:15: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:492:15: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:527:15: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:544:15: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:575:12: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ulg.cpp:619:32: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ung.cpp:248:17: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ung.cpp:257:17: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ung.cpp:266:17: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ung.cpp:275:17: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ung.cpp:285:17: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ung.cpp:391:13: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ung.cpp:452:13: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ung.cpp:549:12: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ung.cpp:589:32: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ung.cpp:633:12: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
  model_ssm_ung.cpp:672:32: warning: 'is_finite<double>' is deprecated: change arma::is_finite(val) to std::isfinite(val) [-Wdeprecated-declarations]
See ‘/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/bssm.Rcheck/00install.out’ for details.
* used C++ compiler: ‘Debian clang version 19.1.7 (3+b2)’