[Bug symtab/31725] [gdb/symtab] wrong .debug_str section used in dwarf_decode_macro_bytes

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31725

--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
I found a bug in gcc dwarf generation (
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115066 ), and the tentative fix
makes this problem unlikely to hit.

Nevertheless, using the fixed dwarf, we run into a bug in gdb, observable, by
enabling complaints.

Fixed by:
...
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index 049ee4d52ff..e2cfa46516b 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -21200,7 +21200,10 @@ dwarf_decode_macros (struct dwarf2_cu *cu, unsigned
int offset,
       str_offsets_section = &cu->dwo_unit->dwo_file
                               ->sections.str_offsets;
       str_section = &cu->dwo_unit->dwo_file->sections.str;
-      str_offsets_base = cu->header.addr_size;
+      if (cu->per_cu->version () <= 4)
+       str_offsets_base = 0;
+      else
+       str_offsets_base = cu->header.addr_size;
     }
   else
     {
...

FWIW, the "str_offsets_base = cu->header.addr_size" makes no sense to me atm.

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