[Bug c++/65734] Yet another case of lost alignment by stor_layout

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65734

Jan Hubicka <hubicka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hubicka at gcc dot gnu.org,
                   |                            |jakub at redhat dot com,
                   |                            |jason at redhat dot com

--- Comment #1 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
With the following check in stor-laout.c

Index: stor-layout.c
===================================================================
--- stor-layout.c       (revision 221977)
+++ stor-layout.c       (working copy)
@@ -1831,6 +1831,8 @@ finalize_type_size (tree type)
        {
          TYPE_SIZE (variant) = size;
          TYPE_SIZE_UNIT (variant) = size_unit;
+         if (TYPE_USER_ALIGN (variant))
+           gcc_assert (user_align && TYPE_ALIGN (variant) == align);
          TYPE_ALIGN (variant) = align;
          TYPE_PRECISION (variant) = precision;
          TYPE_USER_ALIGN (variant) = user_align;


I get:

0xa87ace finalize_type_size
        ../../gcc/stor-layout.c:1835
0xa87bbe finish_record_layout(record_layout_info_s*, int)
        ../../gcc/stor-layout.c:2079
0x6454bc layout_class_type
        ../../gcc/cp/class.c:6468
0x6454bc finish_struct_1(tree_node*)
        ../../gcc/cp/class.c:6598
0x631f4e instantiate_class_template_1
        ../../gcc/cp/pt.c:9648
0x631f4e instantiate_class_template(tree_node*)
        ../../gcc/cp/pt.c:9688
0x68a20d complete_type(tree_node*)
        ../../gcc/cp/typeck.c:146
0x63216c instantiate_class_template_1
        ../../gcc/cp/pt.c:9469
0x63216c instantiate_class_template(tree_node*)
        ../../gcc/cp/pt.c:9688
0x68a20d complete_type(tree_node*)
        ../../gcc/cp/typeck.c:146
0x5f6876 start_decl_1(tree_node*, bool)
        ../../gcc/cp/decl.c:4900
0x60567f start_decl(cp_declarator const*, cp_decl_specifier_seq*, int,
tree_node*, tree_node*, tree_node**)
        ../../gcc/cp/decl.c:4863
0x67b646 cp_parser_init_declarator
        ../../gcc/cp/parser.c:17170
0x67cc1c cp_parser_simple_declaration
        ../../gcc/cp/parser.c:11607
0x666503 cp_parser_block_declaration
        ../../gcc/cp/parser.c:11481
0x6860b9 cp_parser_declaration
        ../../gcc/cp/parser.c:11378
0x6849aa cp_parser_declaration_seq_opt
        ../../gcc/cp/parser.c:11264
0x684cbf cp_parser_translation_unit
        ../../gcc/cp/parser.c:4100
0x684cbf c_parse_file()
        ../../gcc/cp/parser.c:33192
0x736ac2 c_common_parse_file()
        ../../gcc/c-family/c-opts.c:1057