re PR c++/87080 (ice in cp_get_fndecl_from_callee, at cp/cvt.c:965)

	PR c++/87080
	* typeck.c (maybe_warn_pessimizing_move): Do nothing in a template.

	* g++.dg/cpp0x/Wpessimizing-move5.C: New test.

From-SVN: r263862

gcc/cp/ChangeLog

+2018-08-26  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/87080
+	* typeck.c (maybe_warn_pessimizing_move): Do nothing in a template.
+
 2018-08-24  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/67012

gcc/cp/typeck.c

@@ -9192,6 +9192,11 @@ maybe_warn_pessimizing_move (tree retval, tree functype)
   if (cxx_dialect < cxx11)
     return;
 
+  /* Wait until instantiation time, since we can't gauge if we should do
+     the NRVO until then.  */
+  if (processing_template_decl)
+    return;
+
   /* This is only interesting for class types.  */
   if (!CLASS_TYPE_P (functype))
     return;

gcc/testsuite/ChangeLog

+2018-08-26  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/87080
+	* g++.dg/cpp0x/Wpessimizing-move5.C: New test.
+
 2018-08-25  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR libfortran/86704

gcc/testsuite/g++.dg/cpp0x/Wpessimizing-move5.C

+// PR c++/87080
+// { dg-do compile { target c++11 } }
+// { dg-options "-Wpessimizing-move" }
+
+struct a {
+  template<typename b> a &operator<<(b);
+};
+a c();
+template<typename>
+a fn2()
+{
+  int d = 42;
+  return c() << d;
+}