Hi!
DWARF5 added DW_AT_export_symbols both for use on inline namespaces (where
we emit it), but also on anonymous unions/structs (and we didn't emit that
attribute there).
The following patch fixes it.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2024-02-16 Jakub Jelinek <ja...@redhat.com>
PR debug/113918
* dwarf2out.cc (gen_field_die): Emit DW_AT_export_symbols
on anonymous unions or structs for -gdwarf-5 or -gno-strict-dwarf.
* c-c++-common/dwarf2/pr113918.c: New test.
--- gcc/dwarf2out.cc.jj 2024-02-10 11:25:09.836476263 +0100
+++ gcc/dwarf2out.cc 2024-02-15 13:38:14.485675460 +0100
@@ -25153,6 +25153,20 @@ gen_field_die (tree decl, struct vlr_con
add_accessibility_attribute (decl_die, decl);
+ /* Add DW_AT_export_symbols to anonymous unions or structs. */
+ if ((dwarf_version >= 5 || !dwarf_strict) && DECL_NAME (decl) == NULL_TREE)
+ if (tree type = member_declared_type (decl))
+ {
+ tree type_id = TYPE_IDENTIFIER (TYPE_MAIN_VARIANT (type));
+ if (RECORD_OR_UNION_TYPE_P (type)
+ && (type_id == NULL_TREE || IDENTIFIER_ANON_P (type_id)))
+ {
+ dw_die_ref type_die = lookup_type_die (TYPE_MAIN_VARIANT (type));
+ if (type_die && get_AT (type_die, DW_AT_export_symbols) == NULL)
+ add_AT_flag (type_die, DW_AT_export_symbols, 1);
+ }
+ }
+
/* Equate decl number to die, so that we can look up this decl later on. */
equate_decl_number_to_die (decl, decl_die);
}
--- gcc/testsuite/c-c++-common/dwarf2/pr113918.c.jj 2024-02-15
13:26:53.935984554 +0100
+++ gcc/testsuite/c-c++-common/dwarf2/pr113918.c 2024-02-15
13:26:48.773055181 +0100
@@ -0,0 +1,33 @@
+/* PR debug/113918 */
+/* { dg-do compile } */
+/* { dg-options "-gdwarf-5 -dA -fno-merge-debug-strings" } */
+
+struct S {
+ union {
+ int i;
+ long long j;
+ };
+ struct {
+ int k;
+ long long l;
+ };
+ union {
+ int m;
+ long long n;
+ } u;
+ struct {
+ int o;
+ long long p;
+ } v;
+} s;
+
+int
+main ()
+{
+ s.i = 1;
+ s.k = 2;
+ s.u.m = 3;
+ s.v.o = 4;
+}
+
+/* { dg-final { scan-assembler-times "DW_AT_export_symbols" 4 } } */
Jakub
