https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100545
--- Comment #4 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:0aa277bf0b4b794314ab3f11bab438d17b57465d commit r13-57-g0aa277bf0b4b794314ab3f11bab438d17b57465d Author: Jason Merrill <ja...@redhat.com> Date: Fri Apr 15 16:27:05 2022 -0400 c-family: attribute ((aligned, mode)) [PR100545] The problem here was that handle_mode_attribute clobbered the changes of any previous attribute, only copying type qualifiers to the new type. And common_handle_aligned_attribute had previously set up the typedef, so when we later called set_underlying_type it saw DECL_ORIGINAL_TYPE set and just returned, even though handle_mode_attribute had messed up the TREE_TYPE. So, let's fix handle_mode_attribute to copy attributes, alignment, and typedefness to the new type. PR c/100545 gcc/c-family/ChangeLog: * c-attribs.cc (handle_mode_attribute): Copy attributes, aligned, and typedef. * c-common.cc (set_underlying_type): Add assert. gcc/testsuite/ChangeLog: * c-c++-common/attr-mode-1.c: New test. * c-c++-common/attr-mode-2.c: New test.
