debug/94273 - avoid creating type DIEs for DINFO_LEVEL_TERSE

This avoids completing types for DINFO_LEVEL_TERSE by using
the should_emit_struct_debug machinery.

2020-03-27  Richard Biener  <rguenther@suse.de>

	PR debug/94273
	* dwarf2out.c (should_emit_struct_debug): Return false for
	DINFO_LEVEL_TERSE.

	* g++.dg/debug/pr94273.C: New testcase.

gcc/ChangeLog

 2020-03-27  Richard Biener  <rguenther@suse.de>
 
+	PR debug/94273
+	* dwarf2out.c (should_emit_struct_debug): Return false for
+	DINFO_LEVEL_TERSE.
+
+2020-03-27  Richard Biener  <rguenther@suse.de>
+
 	PR tree-optimization/94352
 	* tree-ssa-propagate.c (ssa_prop_init): Move seeding of the
 	worklist ...

gcc/dwarf2out.c

@@ -399,6 +399,9 @@ get_full_len (const wide_int &op)
 static bool
 should_emit_struct_debug (tree type, enum debug_info_usage usage)
 {
+  if (debug_info_level <= DINFO_LEVEL_TERSE)
+    return false;
+
   enum debug_struct_file criterion;
   tree type_decl;
   bool generic = lang_hooks.types.generic_p (type);

gcc/testsuite/ChangeLog

+2020-03-27  Richard Biener  <rguenther@suse.de>
+
+	PR debug/94273
+	* g++.dg/debug/pr94273.C: New testcase.
+
 2020-03-27  Tobias Burnus  <tobias@codesourcery.com>
 
 	PR fortran/93957

gcc/testsuite/g++.dg/debug/pr94273.C

+class a {
+    virtual void c() {}
+} extern b;
+a b;