re PR c++/48534 ([C++0x][SFINAE] Compiler break down on explicit scoped enum => bool conversion)

	PR c++/48534
	* cvt.c (ocp_convert): Use build_nop to convert to underlying type
	of scoped enum.

From-SVN: r172284

gcc/cp/ChangeLog

 2011-04-11  Jason Merrill  <jason@redhat.com>
 
+	PR c++/48534
+	* cvt.c (ocp_convert): Use build_nop to convert to underlying type
+	of scoped enum.
+
 	PR c++/48523
 	* tree.c (maybe_dummy_object): Use build_x_indirect_ref rather
 	than cp_build_indirect_ref.

gcc/cp/cvt.c

@@ -731,7 +731,7 @@ ocp_convert (tree type, tree expr, int convtype, int flags)
 	  /* We can't implicitly convert a scoped enum to bool, so convert
 	     to the underlying type first.  */
 	  if (SCOPED_ENUM_P (intype) && (convtype & CONV_STATIC))
-	    e = convert (ENUM_UNDERLYING_TYPE (intype), e);
+	    e = build_nop (ENUM_UNDERLYING_TYPE (intype), e);
 	  return cp_truthvalue_conversion (e);
 	}
 

gcc/testsuite/ChangeLog

 2011-04-11  Jason Merrill  <jason@redhat.com>
 
+	* g++.dg/cpp0x/enum10.C: New.
+
 	* g++.dg/cpp0x/lambda/lambda-this4.C: New.
 
 	* g++.dg/cpp0x/rv-func.C: New.

gcc/testsuite/g++.dg/cpp0x/enum10.C

+// PR c++/48534
+// { dg-options -std=c++0x }
+
+enum class OpSE : bool;
+
+int main()
+{
+  return static_cast<bool>(OpSE());
+}