clang/test/Preprocessor/warn-macro-undef.c

   1 // RUN: %clang_cc1 %s -Eonly -Wundef -verify=undef
   2 // RUN: %clang_cc1 %s -Eonly -Wundef-prefix=A,BC -verify=undef-prefix
   3 // RUN: %clang_cc1 %s -Eonly -Wundef -Wundef-prefix=A,BC -verify=both
   4 // RUN: %clang_cc1 %s -Eonly -Werror=undef -verify=undef-error
   5 // RUN: %clang_cc1 %s -Eonly -Werror=undef-prefix -Wundef-prefix=A,BC -verify=undef-prefix-error
   6 // RUN: %clang_cc1 %s -Eonly -Werror=undef -Wundef-prefix=A,BC -verify=both-error
   7
   8 extern int x;
   9
  10 #if AB // #1
  11 #endif
  12 // undef-warning@#1 {{'AB' is not defined, evaluates to 0}}
  13 // undef-prefix-warning@#1 {{'AB' is not defined, evaluates to 0}}
  14 // both-warning@#1 {{'AB' is not defined, evaluates to 0}}
  15 // undef-error-error@#1 {{'AB' is not defined, evaluates to 0}}
  16 // undef-prefix-error-error@#1 {{'AB' is not defined, evaluates to 0}}
  17 // both-error-error@#1 {{'AB' is not defined, evaluates to 0}}
  18
  19 #if B // #2
  20 #endif
  21 // undef-warning@#2 {{'B' is not defined, evaluates to 0}}
  22 // no warning for undef-prefix
  23 // both-warning@#2 {{'B' is not defined, evaluates to 0}}
  24 // undef-error-error@#2 {{'B' is not defined, evaluates to 0}}
  25 // no error for undef-prefix
  26 // both-error-error@#2 {{'B' is not defined, evaluates to 0}}
  27
  28 #define BC 0
  29 #if BC // no warning/error
  30 #endif
  31
  32 #undef BC
  33 #if BC // #3
  34 #endif
  35 // undef-warning@#3 {{'BC' is not defined, evaluates to 0}}
  36 // undef-prefix-warning@#3 {{'BC' is not defined, evaluates to 0}}
  37 // both-warning@#3 {{'BC' is not defined, evaluates to 0}}
  38 // undef-error-error@#3 {{'BC' is not defined, evaluates to 0}}
  39 // undef-prefix-error-error@#3 {{'BC' is not defined, evaluates to 0}}
  40 // both-error-error@#3 {{'BC' is not defined, evaluates to 0}}
  41
  42 // Test that #pragma-enabled 'Wundef' can override 'Wundef-prefix'
  43 #pragma clang diagnostic error "-Wundef"
  44
  45 #if C // #4
  46 #endif
  47 // undef-error@#4 {{'C' is not defined, evaluates to 0}}
  48 // undef-prefix-error@#4 {{'C' is not defined, evaluates to 0}}
  49 // both-error@#4 {{'C' is not defined, evaluates to 0}}
  50 // undef-error-error@#4 {{'C' is not defined, evaluates to 0}}
  51 // undef-prefix-error-error@#4 {{'C' is not defined, evaluates to 0}}
  52 // both-error-error@#4 {{'C' is not defined, evaluates to 0}}