https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98481
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:3dd0d3ee1d2a988e7f3a3e8f009fcf328f16d2ed commit r11-6592-g3dd0d3ee1d2a988e7f3a3e8f009fcf328f16d2ed Author: Jakub Jelinek <ja...@redhat.com> Date: Thu Jan 7 17:47:18 2021 +0100 c++, abi: Fix abi_tag attribute handling [PR98481] In GCC10 cp_walk_subtrees has been changed to walk template arguments. As the following testcase, that changed the mangling of some functions. I believe the previous behavior that find_abi_tags_r doesn't recurse into template args has been the correct one, but setting *walk_subtrees = 0 for the types and handling the types subtree walking manually in find_abi_tags_r looks too hard, there are a lot of subtrees and details what should and shouldn't be walked, both in tree.c (walk_type_fields there, which is static) and in cp_walk_subtrees itself. The following patch abuses the fact that *walk_subtrees is an int to tell cp_walk_subtrees it shouldn't walk the template args. Co-authored-by: Jason Merrill <ja...@redhat.com> gcc/cp/ChangeLog: PR c++/98481 * class.c (find_abi_tags_r): Set *walk_subtrees to 2 instead of 1 for types. (mark_abi_tags_r): Likewise. * decl2.c (min_vis_r): Likewise. * tree.c (cp_walk_subtrees): If *walk_subtrees_p is 2, look through typedefs. gcc/testsuite/ChangeLog: PR c++/98481 * g++.dg/abi/abi-tag24.C: New test.
