Changelog • RcppTrust

RcppTrust 0.2.1

CRAN release: 2026-10-31

Errors raised inside the R callbacks of bobyqa(), newuoa() and steihaug() are again reported unchanged on clang/libc++ builds (CRAN’s fedora-clang check showed “c++ exception (unknown reason)”). The error is now stored by value and re-thrown afresh instead of going through std::exception_ptr (#3).
The OpenMP thread-safety tests use at most 2 threads and respect OMP_THREAD_LIMIT, so CRAN no longer sees “OMP: Warning #96: Cannot form a team” (#3).
The bobyqa()/newuoa() vs. ‘minqa’ comparison tests compare the permutation-invariant chebyquad solutions as a set on platforms without bitwise agreement, fixing a test failure on CRAN’s linux-arm64 check where the FMA-contracted ‘minqa’ build reached the same minimum with two coordinates swapped.
The NEWUOA ierr = 3 test is skipped when R lacks long double support, since its rounding path depends on sum() accumulating in long double (CRAN’s noLD check).

CRAN release: 2026-10-27

The package license is now GPL-2, because the BOBYQA/NEWUOA ports and their R wrappers derive from the GPL-2 package ‘minqa’.
M. J. D. Powell is added as an author for the BOBYQA/NEWUOA algorithms and original Fortran code; sources and notices for all ported code (‘trust’, ‘basin’, ‘minqa’, Powell’s Fortran) are listed in inst/COPYRIGHTS.
New steihaug(): a Steihaug truncated conjugate-gradient trust-region Newton minimizer ported from the Rust crate ‘basin’, with exact-Hessian and matrix-free (Hessian-vector product) modes, and a thread-safe C entry point steihaug_solve_c().
New bobyqa() and newuoa(): thread-safe C++ ports of Powell’s derivative-free BOBYQA and NEWUOA from ‘minqa’ 1.2.8, drop-in replacements for minqa::bobyqa()/minqa::newuoa(), with C entry points bobyqa_solve_c()/newuoa_solve_c(). BOBYQA’s RESCUE step evaluates the intended point rather than minqa’s uninitialized one.
.RcppTrustPtr() and RcppTrust.h gain appended slots for the new C entry points and their result-free functions.
New vignette vignette("trust-region-methods").

CRAN release: 2026-09-07