// This should warn by default.
// RUN: clang-cc %s 2>&1 | grep "warning:" &&

// This should not emit anything.
// RUN: clang-cc %s -w 2>&1 | not grep diagnostic &&
// RUN: clang-cc %s -Wno-#warnings 2>&1 | not grep diagnostic &&

// -Werror can map all warnings to error.
// RUN: clang-cc %s -Werror 2>&1 | grep "error:" &&

// -Werror can map this one warning to error.
// RUN: clang-cc %s -Werror=#warnings 2>&1 | grep "error:" &&

// -Wno-error= overrides -Werror.  rdar://3158301
// RUN: clang-cc %s -Werror -Wno-error=#warnings 2>&1 | grep "warning:"

#warning foo