1  /* Test bool.
       2     Copyright (C) 2002-2007, 2009-2022 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 <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
      18  
      19  /* Define ADDRESS_CHECK_OKAY if it is OK to assign an address to a 'bool'
      20     and this does not generate a warning (because we want this test to succeed
      21     even when using gcc's -Werror).  */
      22  #if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) \
      23      || (__clang_major__ >= 4)
      24  /* We can silence the warning.  */
      25  # pragma GCC diagnostic ignored "-Waddress"
      26  # define ADDRESS_CHECK_OKAY
      27  #elif defined __GNUC__ || defined __clang__
      28  /* There may be a warning.  */
      29  #else
      30  /* Ignore warnings from other compilers.  */
      31  # define ADDRESS_CHECK_OKAY
      32  #endif
      33  
      34  #include <config.h>
      35  
      36  #ifdef TEST_STDBOOL_H
      37  # include <stdbool.h>
      38  #endif
      39  
      40  #if false
      41   "error: false is not 0"
      42  #endif
      43  #if true != 1
      44   "error: true is not 1"
      45  #endif
      46  
      47  /* Several tests cannot be guaranteed with gnulib's <stdbool.h>, at
      48     least, not for all compilers and compiler options.  */
      49  #if ((HAVE_C_BOOL || defined __cplusplus \
      50        || HAVE_STDBOOL_H || 3 <= __GNUC__ || 4 <= __clang_major__) \
      51       && !defined _MSC_VER)
      52  # define WORKING_BOOL 1
      53  #else
      54  # define WORKING_BOOL 0
      55  #endif
      56  
      57  #if WORKING_BOOL
      58  struct s { bool s: 1; bool t; } s;
      59  #endif
      60  
      61  char a[true == 1 ? 1 : -1];
      62  char b[false == 0 ? 1 : -1];
      63  #if WORKING_BOOL
      64  char d[(bool) 0.5 == true ? 1 : -1];
      65  # ifdef ADDRESS_CHECK_OKAY /* Avoid gcc warning.  */
      66  /* C99 may plausibly be interpreted as not requiring support for a cast from
      67     a variable's address to bool in a static initializer.  So treat it like a
      68     GCC extension.  */
      69  #  if defined __GNUC__ || defined __clang__
      70  bool e = &s;
      71  #  endif
      72  # endif
      73  char f[(bool) 0.0 == false ? 1 : -1];
      74  #endif
      75  char g[true];
      76  char h[sizeof (bool)];
      77  #if WORKING_BOOL
      78  char i[sizeof s.t];
      79  #endif
      80  enum { j = false, k = true, l = false * true, m = true * 256 };
      81  bool n[m];
      82  char o[sizeof n == m * sizeof n[0] ? 1 : -1];
      83  char p[-1 - (bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
      84  /* Catch a bug in an HP-UX C compiler.  See
      85     https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
      86     https://lists.gnu.org/r/bug-coreutils/2005-11/msg00161.html
      87   */
      88  bool q = true;
      89  bool *pq = &q;
      90  
      91  int
      92  main ()
      93  {
      94    int error = 0;
      95  
      96  #if WORKING_BOOL
      97  # ifdef ADDRESS_CHECK_OKAY /* Avoid gcc warning.  */
      98    /* A cast from a variable's address to bool is valid in expressions.  */
      99    {
     100      bool e1 = &s;
     101      if (!e1)
     102        error = 1;
     103    }
     104  # endif
     105  #endif
     106  
     107    /* Catch a bug in IBM AIX xlc compiler version 6.0.0.0
     108       reported by James Lemley on 2005-10-05; see
     109       https://lists.gnu.org/r/bug-coreutils/2005-10/msg00086.html
     110       This is a runtime test, since a corresponding compile-time
     111       test would rely on initializer extensions.  */
     112    {
     113      char digs[] = "0123456789";
     114      if (&(digs + 5)[-2 + (bool) 1] != &digs[4])
     115        error = 1;
     116    }
     117  
     118    return error;
     119  }