now works with -fno-exceptions and -fno-rtti

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@110828 91177308-0d34-0410-b5e6-96231b3b80d8

include/exception

@@ -141,6 +141,7 @@ template<class _E>
 exception_ptr
 make_exception_ptr(_E __e)
 {
+#ifndef _LIBCPP_NO_EXCEPTIONS
     try
     {
         throw __e;
@@ -149,6 +150,7 @@ make_exception_ptr(_E __e)
     {
         return current_exception();
     }
+#endif
 }
 
 // nested_exception
@@ -188,7 +190,9 @@ throw_with_nested (_Tp& __t, typename enable_if<
                                     >::type* = 0)
 #endif
 {
+#ifndef _LIBCPP_NO_EXCEPTIONS
     throw __nested<typename remove_reference<_Tp>::type>(_STD::forward<_Tp>(__t));
+#endif
 }
 
 template <class _Tp>
@@ -204,7 +208,9 @@ throw_with_nested (_Tp& __t, typename enable_if<
                                     >::type* = 0)
 #endif
 {
+#ifndef _LIBCPP_NO_EXCEPTIONS
     throw _STD::forward<_Tp>(__t);
+#endif
 }
 
 template <class _E>