re PR c++/45330 (Suggest likely nested-name-specifiers for undeclared identifiers.)

gcc/cp/
	PR c++/45330
	* cp-tree.h (suggest_alternatives_for): Add location_t parameter.
	* name-lookup.c (suggest_alternatives_for): Likewise.  Adjust.
	* lex.c (unqualified_name_lookup_error): Adjust call to it.
	* semantics.c (qualified_name_lookup_error): Move to...
	* error.c (qualified_name_lookup_error): ...here.  Call.
	suggest_alternatives_for.

gcc/testsuite/
	PR c++/45330
	* g++.dg/lookup/suggestions1.C: New test.

From-SVN: r167814

1 files changed, 36 insertions, 0 deletions

diff --git a/gcc/cp/error.c b/gcc/cp/error.c
index e1bac24..3e91115 100644
--- a/gcc/cp/error.c
+++ b/gcc/cp/error.c
@@ -3167,3 +3167,39 @@ pedwarn_cxx98 (location_t location, int opt, const char *gmsgid, ...)
   va_end (ap);
   return report_diagnostic (&diagnostic);
 }
+
+/* Issue a diagnostic that NAME cannot be found in SCOPE.  DECL is what
+   we found when we tried to do the lookup.  LOCATION is the location of
+   the NAME identifier.  */
+
+void
+qualified_name_lookup_error (tree scope, tree name,
+			     tree decl, location_t location)
+{
+  if (scope == error_mark_node)
+    ; /* We already complained.  */
+  else if (TYPE_P (scope))
+    {
+      if (!COMPLETE_TYPE_P (scope))
+	error_at (location, "incomplete type %qT used in nested name specifier",
+		  scope);
+      else if (TREE_CODE (decl) == TREE_LIST)
+	{
+	  error_at (location, "reference to %<%T::%D%> is ambiguous",
+		    scope, name);
+	  print_candidates (decl);
+	}
+      else
+	error_at (location, "%qD is not a member of %qT", name, scope);
+    }
+  else if (scope != global_namespace)
+    {
+      error_at (location, "%qD is not a member of %qD", name, scope);
+      suggest_alternatives_for (location, name);
+    }
+  else
+    {
+      error_at (location, "%<::%D%> has not been declared", name);
+      suggest_alternatives_for (location, name);
+    }
+}