tests/test-stdbool.c

   1 /* Test of <stdbool.h> substitute.
   2    Copyright (C) 2002-2007, 2009-2017 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  18
  19 /* We want this test to succeed even when using gcc's -Werror; but to
  20    do that requires a pragma that didn't exist before 4.3.0.  */
  21 #ifndef __GNUC__
  22 # define ADDRESS_CHECK_OKAY
  23 #elif __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 3)
  24 /* No way to silence -Waddress.  */
  25 #else
  26 # pragma GCC diagnostic ignored "-Waddress"
  27 # define ADDRESS_CHECK_OKAY
  28 #endif
  29
  30 #include <config.h>
  31
  32 #include <stdbool.h>
  33
  34 #ifndef bool
  35  "error: bool is not defined"
  36 #endif
  37 #ifndef false
  38  "error: false is not defined"
  39 #endif
  40 #if false
  41  "error: false is not 0"
  42 #endif
  43 #ifndef true
  44  "error: true is not defined"
  45 #endif
  46 #if true != 1
  47  "error: true is not 1"
  48 #endif
  49 #ifndef __bool_true_false_are_defined
  50  "error: __bool_true_false_are_defined is not defined"
  51 #endif
  52
  53 /* Several tests cannot be guaranteed with gnulib's <stdbool.h>, at
  54    least, not for all compilers and compiler options.  */
  55 #if HAVE_STDBOOL_H || 3 <= __GNUC__
  56 struct s { _Bool s: 1; _Bool t; } s;
  57 #endif
  58
  59 char a[true == 1 ? 1 : -1];
  60 char b[false == 0 ? 1 : -1];
  61 char c[__bool_true_false_are_defined == 1 ? 1 : -1];
  62 #if HAVE_STDBOOL_H || 3 <= __GNUC__ /* See above.  */
  63 char d[(bool) 0.5 == true ? 1 : -1];
  64 # ifdef ADDRESS_CHECK_OKAY /* Avoid gcc warning.  */
  65 /* C99 may plausibly be interpreted as not requiring support for a cast from
  66    a variable's address to bool in a static initializer.  So treat it like a
  67    GCC extension.  */
  68 #  ifdef __GNUC__
  69 bool e = &s;
  70 #  endif
  71 # endif
  72 char f[(_Bool) 0.0 == false ? 1 : -1];
  73 #endif
  74 char g[true];
  75 char h[sizeof (_Bool)];
  76 #if HAVE_STDBOOL_H || 3 <= __GNUC__ /* See above.  */
  77 char i[sizeof s.t];
  78 #endif
  79 enum { j = false, k = true, l = false * true, m = true * 256 };
  80 _Bool n[m];
  81 char o[sizeof n == m * sizeof n[0] ? 1 : -1];
  82 char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
  83 /* Catch a bug in an HP-UX C compiler.  See
  84    http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
  85    http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html
  86  */
  87 _Bool q = true;
  88 _Bool *pq = &q;
  89
  90 int
  91 main ()
  92 {
  93   int error = 0;
  94
  95 #if HAVE_STDBOOL_H || 3 <= __GNUC__ /* See above.  */
  96 # ifdef ADDRESS_CHECK_OKAY /* Avoid gcc warning.  */
  97   /* A cast from a variable's address to bool is valid in expressions.  */
  98   {
  99     bool e1 = &s;
 100     if (!e1)
 101       error = 1;
 102   }
 103 # endif
 104 #endif
 105
 106   /* Catch a bug in IBM AIX xlc compiler version 6.0.0.0
 107      reported by James Lemley on 2005-10-05; see
 108      http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html
 109      This is a runtime test, since a corresponding compile-time
 110      test would rely on initializer extensions.  */
 111   {
 112     char digs[] = "0123456789";
 113     if (&(digs + 5)[-2 + (bool) 1] != &digs[4])
 114       error = 1;
 115   }
 116
 117   return error;
 118 }