Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: %clang_cc1 -fsyntax-only -verify %s -triple i386-apple-darwin9 void foo(int a, ...) { __builtin_ms_va_start((void *)0, a); // expected-error {{this builtin is only available on x86-64 and aarch64 targets}} }