[Bug symtab/30661] [gdb/symtab] main symbol language lookup causes symtab expansion

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

https://sourceware.org/bugzilla/show_bug.cgi?id=30661

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at sourceware dot org

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
Using this:
...
vries@xerxes:~/gdb/src> git diff
diff --git a/gdb/dwarf2/cooked-index.c b/gdb/dwarf2/cooked-index.c
index 25635d9b72e..0b2d35f4b86 100644
--- a/gdb/dwarf2/cooked-index.c
+++ b/gdb/dwarf2/cooked-index.c
@@ -62,7 +62,7 @@ bool
 language_requires_canonicalization (enum language lang)
 {
   return (lang == language_ada
-         || lang == language_c
+         || lang == language_d
          || lang == language_cplus);
 }

@@ -242,6 +242,10 @@ cooked_index_shard::add (sect_offset die_offset, enum
dwarf_tag tag,
      implicit "main" discovery.  */
   if ((flags & IS_MAIN) != 0)
     m_main = result;
+  else if (!language_requires_canonicalization (per_cu->lang ())
+          && m_main == nullptr
+          && strcmp (name, "main") == 0)
+    m_main = result;

   return result;
 }
...
we get the old behaviour back, without regressing on
gdb.dlang/dlang-start-2.exp (can't run gdb.dlang/dlang-start.exp).

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