Hi, this is the complete patch, tested x86_64-linux.
Thanks, Paolo. ////////////////////////
/c-family 2018-01-25 Paolo Carlini <paolo.carl...@oracle.com> * c-common.h (DECL_UNNAMED_BIT_FIELD): New. /c 2018-01-25 Paolo Carlini <paolo.carl...@oracle.com> * c-typeck.c (really_start_incremental_init, push_init_level, set_nonincremental_init, output_init_element, process_init_element): Use DECL_UNNAMED_BIT_FIELD. /cp 2018-01-25 Paolo Carlini <paolo.carl...@oracle.com> * class.c (is_really_empty_class): Use DECL_UNNAMED_BIT_FIELD. * constexpr.c (cx_check_missing_mem_inits): Likewise. * decl.c (next_initializable_field, find_decomp_class_base, cp_finish_decomp): Likewise. * typeck2.c (process_init_constructor_record): Likewise.
Index: c/c-typeck.c =================================================================== --- c/c-typeck.c (revision 257063) +++ c/c-typeck.c (working copy) @@ -7955,8 +7955,7 @@ really_start_incremental_init (tree type) constructor_fields = TYPE_FIELDS (constructor_type); /* Skip any nameless bit fields at the beginning. */ while (constructor_fields != NULL_TREE - && DECL_C_BIT_FIELD (constructor_fields) - && DECL_NAME (constructor_fields) == NULL_TREE) + && DECL_UNNAMED_BIT_FIELD (constructor_fields)) constructor_fields = DECL_CHAIN (constructor_fields); constructor_unfilled_fields = constructor_fields; @@ -8161,8 +8160,7 @@ push_init_level (location_t loc, int implicit, constructor_fields = TYPE_FIELDS (constructor_type); /* Skip any nameless bit fields at the beginning. */ while (constructor_fields != NULL_TREE - && DECL_C_BIT_FIELD (constructor_fields) - && DECL_NAME (constructor_fields) == NULL_TREE) + && DECL_UNNAMED_BIT_FIELD (constructor_fields)) constructor_fields = DECL_CHAIN (constructor_fields); constructor_unfilled_fields = constructor_fields; @@ -8930,8 +8928,7 @@ set_nonincremental_init (struct obstack * braced_i constructor_unfilled_fields = TYPE_FIELDS (constructor_type); /* Skip any nameless bit fields at the beginning. */ while (constructor_unfilled_fields != NULL_TREE - && DECL_C_BIT_FIELD (constructor_unfilled_fields) - && DECL_NAME (constructor_unfilled_fields) == NULL_TREE) + && DECL_UNNAMED_BIT_FIELD (constructor_unfilled_fields)) constructor_unfilled_fields = TREE_CHAIN (constructor_unfilled_fields); } @@ -9300,8 +9297,7 @@ output_init_element (location_t loc, tree value, t /* Skip any nameless bit fields. */ while (constructor_unfilled_fields != NULL_TREE - && DECL_C_BIT_FIELD (constructor_unfilled_fields) - && DECL_NAME (constructor_unfilled_fields) == NULL_TREE) + && DECL_UNNAMED_BIT_FIELD (constructor_unfilled_fields)) constructor_unfilled_fields = DECL_CHAIN (constructor_unfilled_fields); } @@ -9665,8 +9661,8 @@ process_init_element (location_t loc, struct c_exp constructor_unfilled_fields = DECL_CHAIN (constructor_fields); /* Skip any nameless bit fields. */ while (constructor_unfilled_fields != 0 - && DECL_C_BIT_FIELD (constructor_unfilled_fields) - && DECL_NAME (constructor_unfilled_fields) == 0) + && (DECL_UNNAMED_BIT_FIELD + (constructor_unfilled_fields))) constructor_unfilled_fields = DECL_CHAIN (constructor_unfilled_fields); } @@ -9675,8 +9671,7 @@ process_init_element (location_t loc, struct c_exp constructor_fields = DECL_CHAIN (constructor_fields); /* Skip any nameless bit fields at the beginning. */ while (constructor_fields != NULL_TREE - && DECL_C_BIT_FIELD (constructor_fields) - && DECL_NAME (constructor_fields) == NULL_TREE) + && DECL_UNNAMED_BIT_FIELD (constructor_fields)) constructor_fields = DECL_CHAIN (constructor_fields); } else if (TREE_CODE (constructor_type) == UNION_TYPE) Index: c-family/c-common.h =================================================================== --- c-family/c-common.h (revision 257063) +++ c-family/c-common.h (working copy) @@ -939,6 +939,10 @@ extern void c_parse_final_cleanups (void); #define CLEAR_DECL_C_BIT_FIELD(NODE) \ (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0) +/* True if the decl was an unnamed bitfield. */ +#define DECL_UNNAMED_BIT_FIELD(NODE) \ + (DECL_C_BIT_FIELD (NODE) && !DECL_NAME (NODE)) + extern tree do_case (location_t, tree, tree); extern tree build_stmt (location_t, enum tree_code, ...); extern tree build_real_imag_expr (location_t, enum tree_code, tree); Index: cp/class.c =================================================================== --- cp/class.c (revision 257063) +++ cp/class.c (working copy) @@ -8202,7 +8202,7 @@ is_really_empty_class (tree type) if (TREE_CODE (field) == FIELD_DECL && !DECL_ARTIFICIAL (field) /* An unnamed bit-field is not a data member. */ - && (DECL_NAME (field) || !DECL_C_BIT_FIELD (field)) + && !DECL_UNNAMED_BIT_FIELD (field) && !is_really_empty_class (TREE_TYPE (field))) return false; return true; Index: cp/constexpr.c =================================================================== --- cp/constexpr.c (revision 257063) +++ cp/constexpr.c (working copy) @@ -783,7 +783,7 @@ cx_check_missing_mem_inits (tree ctype, tree body, tree ftype; if (TREE_CODE (field) != FIELD_DECL) continue; - if (DECL_C_BIT_FIELD (field) && !DECL_NAME (field)) + if (DECL_UNNAMED_BIT_FIELD (field)) continue; if (DECL_ARTIFICIAL (field)) continue; Index: cp/decl.c =================================================================== --- cp/decl.c (revision 257063) +++ cp/decl.c (working copy) @@ -5634,7 +5634,7 @@ next_initializable_field (tree field) { while (field && (TREE_CODE (field) != FIELD_DECL - || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field)) + || DECL_UNNAMED_BIT_FIELD (field) || (DECL_ARTIFICIAL (field) && !(cxx_dialect >= cxx17 && DECL_FIELD_IS_BASE (field))))) field = DECL_CHAIN (field); @@ -7208,7 +7208,7 @@ find_decomp_class_base (location_t loc, tree type, for (tree field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) if (TREE_CODE (field) != FIELD_DECL || DECL_ARTIFICIAL (field) - || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))) + || DECL_UNNAMED_BIT_FIELD (field)) continue; else if (ret) return type; @@ -7646,7 +7646,7 @@ cp_finish_decomp (tree decl, tree first, unsigned for (tree field = TYPE_FIELDS (btype); field; field = TREE_CHAIN (field)) if (TREE_CODE (field) != FIELD_DECL || DECL_ARTIFICIAL (field) - || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))) + || DECL_UNNAMED_BIT_FIELD (field)) continue; else eltscnt++; @@ -7663,7 +7663,7 @@ cp_finish_decomp (tree decl, tree first, unsigned for (tree field = TYPE_FIELDS (btype); field; field = TREE_CHAIN (field)) if (TREE_CODE (field) != FIELD_DECL || DECL_ARTIFICIAL (field) - || (DECL_C_BIT_FIELD (field) && !DECL_NAME (field))) + || DECL_UNNAMED_BIT_FIELD (field)) continue; else { Index: cp/typeck2.c =================================================================== --- cp/typeck2.c (revision 257063) +++ cp/typeck2.c (working copy) @@ -1395,14 +1395,14 @@ process_init_constructor_record (tree type, tree i tree next; tree type; - if (!DECL_NAME (field) && DECL_C_BIT_FIELD (field)) - continue; - if (TREE_CODE (field) != FIELD_DECL || (DECL_ARTIFICIAL (field) && !(cxx_dialect >= cxx17 && DECL_FIELD_IS_BASE (field)))) continue; + if (DECL_UNNAMED_BIT_FIELD (field)) + continue; + /* If this is a bitfield, first convert to the declared type. */ type = TREE_TYPE (field); if (DECL_BIT_FIELD_TYPE (field)) @@ -1547,8 +1547,6 @@ process_init_constructor_record (tree type, tree i for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) { - if (!DECL_NAME (field) && DECL_C_BIT_FIELD (field)) - continue; if (TREE_CODE (field) != FIELD_DECL || (DECL_ARTIFICIAL (field) && !(cxx_dialect >= cxx17 @@ -1555,6 +1553,9 @@ process_init_constructor_record (tree type, tree i && DECL_FIELD_IS_BASE (field)))) continue; + if (DECL_UNNAMED_BIT_FIELD (field)) + continue; + if (ce->index == field || ce->index == DECL_NAME (field)) break; if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))