gcc/testsuite/gcc.dg/builtin-redefine.c

   1 /* Test -Wno-builtin-macro-redefined warnings.  */
   2
   3 /* { dg-do compile } */
   4 /* { dg-options "-Wno-builtin-macro-redefined -U__DATE__ -D__TIME__=X" } */
   5
   6 /* Check date, time, and datestamp built-ins warnings may be suppressed.  */
   7
   8 #if defined(__DATE__)
   9 #error "__DATE__ is defined, but should not be (-U command line error)"
  10 /* { dg-bogus "__DATE__ is defined" "" { target *-*-* } .-1 } */
  11 #endif
  12
  13 #if __TIME__ != X
  14 #error "__TIME__ is not defined as expected (-D command line error)"
  15 /* { dg-bogus "__TIME__ is not defined" "" { target *-*-* } .-1 } */
  16 #endif
  17
  18 #if !defined(__TIMESTAMP__)
  19 #error "__TIMESTAMP__ is not defined (built-in macro expectation error)"
  20 /* { dg-bogus "__TIMESTAMP__ is not defined" "" { target *-*-* } .-1 } */
  21 #endif
  22
  23
  24 #undef __TIME__              /* Undefine while defined.  */
  25 #undef __TIME__              /* Undefine while already undefined.  */
  26
  27 #define __TIME__ "X"         /* Define while undefined.  */
  28 #define __TIME__ "X"         /* Re-define while defined.  */ /* { dg-line time_prev } */
  29
  30 #define __TIME__ "Y"         /* { dg-warning "-:\"__TIME__\" redefined" } */
  31 /* { dg-message "-:previous definition" "" { target *-*-* } time_prev } */
  32
  33 #undef __TIME__              /* Undefine while defined.  */
  34
  35
  36 #undef __DATE__              /* Undefine while already undefined.  */
  37
  38 #define __DATE__ "X"         /* Define while undefined.  */
  39 #define __DATE__ "X"         /* Re-define while defined.  */ /* { dg-line date_prev } */
  40
  41 #define __DATE__ "Y"         /* { dg-warning "-:\"__DATE__\" redefined" } */
  42 /* { dg-message "-:previous definition" "" { target *-*-* } date_prev } */
  43
  44 #undef __DATE__              /* Undefine while defined.  */
  45
  46
  47 #define __TIMESTAMP__ "X"    /* Define while already defined.  */
  48 #define __TIMESTAMP__ "X"    /* Re-define while defined.  */ /* { dg-line timestamp_prev } */
  49
  50 #define __TIMESTAMP__ "Y"    /* { dg-warning "-:\"__TIMESTAMP__\" redefined" } */
  51 /* { dg-message "-:previous definition" "" { target *-*-* } timestamp_prev } */
  52
  53 #undef __TIMESTAMP__         /* Undefine while defined.  */
  54
  55
  56 /* Check other built-ins with warnings that may be suppressed.  */
  57
  58 #if !defined(__FILE__) || !defined(__BASE_FILE__)
  59 #error "Expected built-in is not defined (built-in macro expectation error)"
  60 /* { dg-bogus "Expected built-in is not defined" "" { target *-*-* } .-1 } */
  61 #endif
  62
  63 #define __FILE__ "X"         /* Define while already defined.  */
  64 #define __BASE_FILE__ "X"    /* Define while already defined.  */
  65
  66
  67 /* Check selected built-ins not affected by warning suppression. */
  68
  69 #if !defined(__LINE__) || !defined(__INCLUDE_LEVEL__) || !defined(__COUNTER__)
  70 #error "Expected built-in is not defined (built-in macro expectation error)"
  71 /* { dg-bogus "Expected built-in is not defined" "" { target *-*-* } .-1 } */
  72 #endif
  73
  74 #define __LINE__ 0           /* { dg-warning "-:\"__LINE__\" redef" } */
  75 #define __INCLUDE_LEVEL__ 0  /* { dg-warning "-:\"__INCLUDE_LEVEL__\" redef" } */
  76 #define __COUNTER__ 0        /* { dg-warning "-:\"__COUNTER__\" redef" } */
  77
  78
  79 int unused;  /* Silence `ISO C forbids an empty translation unit' warning.  */