Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// REQUIRES: system-darwin // Always error about undefined 'TARGET_OS_*' macros on Darwin. // RUN: %clang -### %s 2>&1 | FileCheck %s // CHECK-DAG: "-Wundef-prefix=TARGET_OS_" // CHECK-DAG: "-Werror=undef-prefix"