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      1 // This should warn by default.
      2 // RUN: %clang_cc1 %s 2>&1 | grep "warning:"
      3 
      4 // This should not emit anything.
      5 // RUN: %clang_cc1 %s -w 2>&1 | not grep diagnostic
      6 // RUN: %clang_cc1 %s -Wno-#warnings 2>&1 | not grep diagnostic
      7 
      8 // -Werror can map all warnings to error.
      9 // RUN: not %clang_cc1 %s -Werror 2>&1 | grep "error:"
     10 
     11 // -Werror can map this one warning to error.
     12 // RUN: not %clang_cc1 %s -Werror=#warnings 2>&1 | grep "error:"
     13 
     14 // -Wno-error= overrides -Werror.  rdar://3158301
     15 // RUN: %clang_cc1 %s -Werror -Wno-error=#warnings 2>&1 | grep "warning:"
     16 
     17 // -Wno-error overrides -Werror.  PR4715
     18 // RUN: %clang_cc1 %s -Werror -Wno-error 2>&1 | grep "warning:"
     19 
     20 #warning foo
     21 
     22 
     23