https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115549
--- Comment #4 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:4c7009735f73f59c9a635d79c048c8981310e331 commit r15-1951-g4c7009735f73f59c9a635d79c048c8981310e331 Author: Marek Polacek <pola...@redhat.com> Date: Thu Jun 27 16:39:29 2024 -0400 c: ICE on invalid with attribute optimize [PR115549] I had this PR in my open tabs so why not go ahead and fix it. decl_attributes gets last_decl, the last already pushed declaration, to be used in common_handle_aligned_attribute. In C++, we look up the decl via find_last_decl, which returns NULL_TREE if it finds a decl that had not been declared. In C, we look up the decl via lookup_last_decl which returns error_mark_node rather than NULL_TREE in that case. The error_mark_node causes a crash in common_handle_aligned_attribute. We can fix this on the C FE side like in the patch below. PR c/115549 gcc/c/ChangeLog: * c-decl.cc (c_decl_attributes): If lookup_last_decl returns error_mark_node, use NULL_TREE as last_decl. gcc/testsuite/ChangeLog: * c-c++-common/attr-aligned-2.c: New test.
