Hi! The enumerator still doesn't have TREE_TYPE set but diag_attr_exclusions assumes that all decls must have types. I think it is better in something as unimportant as diag_attr_exclusions to be more robust, if there is no type, it can just diagnose exclusions on the DECL_ATTRIBUTES, like for types it only diagnoses it on TYPE_ATTRIBUTES.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk? 2024-04-15 Jakub Jelinek <ja...@redhat.com> PR c++/114634 * attribs.cc (diag_attr_exclusions): Set attrs[1] to NULL_TREE for decls with NULL TREE_TYPE. * g++.dg/ext/attrib68.C: New test. --- gcc/attribs.cc.jj 2024-02-12 20:44:52.409074876 +0100 +++ gcc/attribs.cc 2024-04-12 18:29:52.000381917 +0200 @@ -468,7 +468,10 @@ diag_attr_exclusions (tree last_decl, tr if (DECL_P (node)) { attrs[0] = DECL_ATTRIBUTES (node); - attrs[1] = TYPE_ATTRIBUTES (TREE_TYPE (node)); + if (TREE_TYPE (node)) + attrs[1] = TYPE_ATTRIBUTES (TREE_TYPE (node)); + else + attrs[1] = NULL_TREE; } else { --- gcc/testsuite/g++.dg/ext/attrib68.C.jj 2024-04-12 18:31:38.100968098 +0200 +++ gcc/testsuite/g++.dg/ext/attrib68.C 2024-04-12 18:30:57.011515625 +0200 @@ -0,0 +1,8 @@ +// PR c++/114634 +// { dg-do compile } + +template <int N> +struct A +{ + enum { e __attribute__ ((aligned (16))) }; // { dg-error "alignment may not be specified for 'e'" } +}; Jakub