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// This should warn by default.
// RUN: %clang_cc1 %s 2>&1 | grep "warning: foo"
// This should not emit anything.
// RUN: %clang_cc1 %s -w 2>&1 | not grep diagnostic
// RUN: %clang_cc1 %s -Wno-#warnings 2>&1 | not grep diagnostic
// RUN: %clang_cc1 %s -Wno-cpp 2>&1 | not grep diagnostic
// -Werror can map all warnings to error.
// RUN: not %clang_cc1 %s -Werror 2>&1 | grep "error: foo"
// -Werror can map this one warning to error.
// RUN: not %clang_cc1 %s -Werror=#warnings 2>&1 | grep "error: foo"
// -Wno-error= overrides -Werror. rdar://3158301
// RUN: %clang_cc1 %s -Werror -Wno-error=#warnings 2>&1 | grep "warning: foo"
// -Wno-error overrides -Werror. PR4715
// RUN: %clang_cc1 %s -Werror -Wno-error 2>&1 | grep "warning: foo"
#warning foo
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