[Bug symtab/29381] [gdb, debug-types, debug-names] read.h:309: internal-error: set_length: Assertion `m_length == length' failed.

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

https://sourceware.org/bugzilla/show_bug.cgi?id=29381

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
This addresses problem 2, both for .debug_names and .gdb_index:
...
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index bcd01107377..3b4409fa8ca 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -2696,7 +2696,10 @@ dwarf2_read_gdb_index
       /* We can only handle a single .debug_types when we have an
         index.  */
       if (per_bfd->types.size () != 1)
-       return 0;
+       {
+         per_bfd->all_comp_units.clear ();
+         return 0;
+       }

       dwarf2_section_info *section = &per_bfd->types[0];

@@ -4701,7 +4704,10 @@ dwarf2_read_debug_names (dwarf2_per_objfile
*per_objfile)

       /* We can only handle a single .debug_types when we have an
         index.  */
       if (per_bfd->types.size () != 1)
-       return false;
+       {
+         per_bfd->all_comp_units.clear ();
+         return false;
+       }

       dwarf2_section_info *section = &per_bfd->types[0];

@@ -7206,6 +7212,7 @@ static void
 create_all_comp_units (dwarf2_per_objfile *per_objfile)
 {
   htab_up types_htab;
+  gdb_assert (per_objfile->per_bfd->all_comp_units.empty ());

   read_comp_units_from_section (per_objfile, &per_objfile->per_bfd->info,
                                &per_objfile->per_bfd->abbrev, 0,
...

Also adds an assert to detect the problem asap.  A similar assert is already
present in create_cus_from_index and create_cus_from_debug_names.

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