https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108080
--- Comment #22 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-15 branch has been updated by Nathaniel Shead <nsh...@gcc.gnu.org>: https://gcc.gnu.org/g:ebfe7bc7d9572c6449848d0362c738b0fafd4fbe commit r15-10183-gebfe7bc7d9572c6449848d0362c738b0fafd4fbe Author: Nathaniel Shead <nathanielosh...@gmail.com> Date: Tue Jul 29 21:46:59 2025 +1000 c++/modules: Warn for optimize attributes instead of ICEing [PR108080] This PR is the most frequently reported modules bug for 15, as the ICE message does not indicate the issue at all and reducing to find the underlying cause can be tricky. I have a WIP patch to fix this issue by just reconstructing these nodes on stream-in from any attributes applied to the functions, but since at this stage it may still take a while to be ready, it seems useful to me to at least make the error here more friendly and guide users to what they could do to work around this issue. In fact, as noted on the PR, a lot of the time it should be harmless to just ignore the optimize etc. attribute and continue translation, at the user's own risk; this patch as such turns the ICE into a warning with no option to silence. PR c++/108080 gcc/cp/ChangeLog: * module.cc (trees_out::core_vals): Warn when streaming target/optimize node; adjust comments. (trees_in::core_vals): Don't stream a target/optimize node. gcc/testsuite/ChangeLog: * g++.dg/modules/pr108080.H: New test. Signed-off-by: Nathaniel Shead <nathanielosh...@gmail.com> Reviewed-by: Jason Merrill <ja...@redhat.com> Reviewed-by: Patrick Palka <ppa...@redhat.com> (cherry picked from commit 643c5b42e21dbc02e9bde01865c880b26aa5f938)
