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* stdbool.m4 (AC_HEADER_STDBOOL): Check that bool promotes to int, not unsigned int, to catch the AIX 5.3 compiler bug.
author Paul Eggert <eggert@cs.ucla.edu>
date Thu, 06 Oct 2005 16:44:39 +0000
parents adff74659d81
children 7398c10d65f5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # Check for stdbool.h that conforms to C99.
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2
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3 dnl Copyright (C) 2002-2005 Free Software Foundation, Inc.
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4 dnl This file is free software; the Free Software Foundation
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5 dnl gives unlimited permission to copy and/or distribute it,
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6 dnl with or without modifications, as long as this notice is preserved.
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7
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8 # Prepare for substituting <stdbool.h> if it is not supported.
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9
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10 AC_DEFUN([AM_STDBOOL_H],
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11 [
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12 AC_REQUIRE([AC_HEADER_STDBOOL])
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13
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14 # Define two additional variables used in the Makefile substitution.
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15
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16 if test "$ac_cv_header_stdbool_h" = yes; then
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17 STDBOOL_H=''
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18 else
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19 STDBOOL_H='stdbool.h'
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20 fi
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21 AC_SUBST([STDBOOL_H])
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22
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23 if test "$ac_cv_type__Bool" = yes; then
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24 HAVE__BOOL=1
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25 else
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26 HAVE__BOOL=0
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27 fi
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28 AC_SUBST([HAVE__BOOL])
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29 ])
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30
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31 # This macro is only needed in autoconf <= 2.59. Newer versions of autoconf
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32 # have this macro built-in.
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33
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34 AC_DEFUN([AC_HEADER_STDBOOL],
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35 [AC_CACHE_CHECK([for stdbool.h that conforms to C99],
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36 [ac_cv_header_stdbool_h],
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37 [AC_TRY_COMPILE(
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38 [
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39 #include <stdbool.h>
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40 #ifndef bool
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41 "error: bool is not defined"
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42 #endif
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43 #ifndef false
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44 "error: false is not defined"
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45 #endif
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46 #if false
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47 "error: false is not 0"
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48 #endif
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49 #ifndef true
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50 "error: true is not defined"
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51 #endif
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52 #if true != 1
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53 "error: true is not 1"
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54 #endif
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55 #ifndef __bool_true_false_are_defined
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56 "error: __bool_true_false_are_defined is not defined"
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57 #endif
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58
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59 struct s { _Bool s: 1; _Bool t; } s;
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60
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61 char a[true == 1 ? 1 : -1];
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62 char b[false == 0 ? 1 : -1];
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63 char c[__bool_true_false_are_defined == 1 ? 1 : -1];
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64 char d[(bool) -0.5 == true ? 1 : -1];
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65 bool e = &s;
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66 char f[(_Bool) -0.0 == false ? 1 : -1];
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67 char g[true];
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68 char h[sizeof (_Bool)];
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69 char i[sizeof s.t];
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70 enum { j = false, k = true, l = false * true, m = true * 256 };
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71 _Bool n[m];
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72 char o[sizeof n == m * sizeof n[0] ? 1 : -1];
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73 char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
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74 ],
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75 [
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76 return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !j + !k + !l
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77 + !m + !n + !o + !p);
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78 ],
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79 [ac_cv_header_stdbool_h=yes],
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80 [ac_cv_header_stdbool_h=no])])
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81 AC_CHECK_TYPES([_Bool])
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82 if test $ac_cv_header_stdbool_h = yes; then
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83 AC_DEFINE(HAVE_STDBOOL_H, 1, [Define to 1 if stdbool.h conforms to C99.])
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84 fi])