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The following patch attempts to implement another part of P3795R2, in particular the addition of annotations to data_member_options and handling it in data_member_spec/define_aggregate etc. 2026-03-31 Jakub Jelinek <jakub@redhat.com> libstdc++-v3/ * include/std/meta (std::meta::data_member_options): Add annotations member. gcc/cp/ * reflect.cc (get_range_elts): If N is negative, just use the tree as object to extract range from instead of finding Nth argument of a call. (eval_is_bit_field, eval_type_of, eval_size_of, eval_alignment_of, eval_bit_size_of, eval_has_identifier, eval_identifier_of): Adjust function comments from P3795R2. (eval_display_string_of): Handle annotations in REFLECT_DATA_MEMBER_SPEC. (eval_annotations_of): Adjust function comments from P3795R2. (eval_data_member_spec): Likewise. Read and diagnose annotations. (eval_define_aggregate): Adjust function comments from P3795R2. Create annotations. (compare_reflections): Compare REFLECT_DATA_MEMBER_SPEC annotations. * mangle.cc (write_reflection): Mangle REFLECT_DATA_MEMBER_SPEC annotations. gcc/testsuite/ * g++.dg/reflect/data_member_spec5.C: New test. * g++.dg/reflect/data_member_spec6.C: New test. * g++.dg/reflect/display_string_of1.C: Expect extra ", {}" before closing paren for empty annotations, otherwise a list of annotations. * g++.dg/reflect/u8display_string_of1.C: Likewise. * g++.dg/reflect/define_aggregate9.C: New test. * g++.dg/reflect/mangle1.C: Test mangling of REFLECT_DATA_MEMBER_SPEC annotations. Reviewed-by: Jason Merrill <jason@redhat.com> Reviewed-by: Jonathan Wakely <jwakely@redhat.com>