Clad 2.4 is now compatible with clang-12 through clang-22, having ported to
LLVM 22 and shifted its support window to the last ten major releases (clang-11
has been dropped). This release strengthens both forward and reverse modes with
OpenMP critical directive support, reverse-mode handling of member access on
call results, and the ability to redefine builtin custom derivatives. CUDA
support advances with tape offloading to VRAM and device-callable tape element
destruction. A major theme is robustness: a graceful fallback when
differentiating parameterless functions, a correctness fix for TBR analysis that
was silently producing wrong derivatives, and an extensive round of
memory-safety cleanup—scope-leak fixes, use-after-poison repairs, and explicit
ownership—surfaced by new LLVM 22 AddressSanitizer CI coverage. Static-library
builds now skip backend pass registration, fixing rootcling dictionary
generation in ROOT. For details, please refer to the release notes.