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annotate m4/stdbool.m4 @ 17536:ea01543bbca7

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install-reloc: Support multi-binary installation. * build-aux/install-reloc: Support installing multiple programs in one invocation, as done by Automake starting with commit 4295fe33eb23f (Multi-file install for PROGRAMS.). From Bruno Haible <bruno@clisp.org>, archived at http://lists.debian.org/debian-bsd/2012/05/msg00032.html. Reported by Sylvain <beuc@gnu.org>.
author Bruno Haible <bruno@clisp.org>
date Mon, 21 Oct 2013 22:48:35 -0700
parents e542fd46ad6f
children 344018b6e5d7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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) 2002-2006, 2009-2013 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 #serial 5
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9
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10 # Prepare for substituting <stdbool.h> if it is not supported.
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11
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12 AC_DEFUN([AM_STDBOOL_H],
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13 [
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14 AC_REQUIRE([AC_CHECK_HEADER_STDBOOL])
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15
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16 # Define two additional variables used in the Makefile substitution.
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17
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18 if test "$ac_cv_header_stdbool_h" = yes; then
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19 STDBOOL_H=''
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20 else
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21 STDBOOL_H='stdbool.h'
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22 fi
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23 AC_SUBST([STDBOOL_H])
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24 AM_CONDITIONAL([GL_GENERATE_STDBOOL_H], [test -n "$STDBOOL_H"])
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25
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26 if test "$ac_cv_type__Bool" = yes; then
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27 HAVE__BOOL=1
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28 else
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29 HAVE__BOOL=0
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30 fi
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31 AC_SUBST([HAVE__BOOL])
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32 ])
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33
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34 # AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future.
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35 AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H])
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36
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37 # This version of the macro is needed in autoconf <= 2.68.
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38
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39 AC_DEFUN([AC_CHECK_HEADER_STDBOOL],
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40 [AC_CACHE_CHECK([for stdbool.h that conforms to C99],
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41 [ac_cv_header_stdbool_h],
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42 [AC_COMPILE_IFELSE(
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43 [AC_LANG_PROGRAM(
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44 [[
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45 #include <stdbool.h>
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46 #ifndef bool
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47 "error: bool is not defined"
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48 #endif
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49 #ifndef false
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50 "error: false is not defined"
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51 #endif
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52 #if false
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53 "error: false is not 0"
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54 #endif
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55 #ifndef true
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56 "error: true is not defined"
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57 #endif
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58 #if true != 1
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59 "error: true is not 1"
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60 #endif
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61 #ifndef __bool_true_false_are_defined
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62 "error: __bool_true_false_are_defined is not defined"
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63 #endif
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64
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65 struct s { _Bool s: 1; _Bool t; } s;
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66
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67 char a[true == 1 ? 1 : -1];
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68 char b[false == 0 ? 1 : -1];
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69 char c[__bool_true_false_are_defined == 1 ? 1 : -1];
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70 char d[(bool) 0.5 == true ? 1 : -1];
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71 /* See body of main program for 'e'. */
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72 char f[(_Bool) 0.0 == false ? 1 : -1];
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73 char g[true];
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74 char h[sizeof (_Bool)];
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75 char i[sizeof s.t];
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76 enum { j = false, k = true, l = false * true, m = true * 256 };
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77 /* The following fails for
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78 HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */
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79 _Bool n[m];
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80 char o[sizeof n == m * sizeof n[0] ? 1 : -1];
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81 char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
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82 /* Catch a bug in an HP-UX C compiler. See
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83 http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
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84 http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html
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85 */
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86 _Bool q = true;
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87 _Bool *pq = &q;
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88 ]],
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89 [[
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90 bool e = &s;
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91 *pq |= q;
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92 *pq |= ! q;
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93 /* Refer to every declared value, to avoid compiler optimizations. */
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94 return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l
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95 + !m + !n + !o + !p + !q + !pq);
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96 ]])],
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97 [ac_cv_header_stdbool_h=yes],
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98 [ac_cv_header_stdbool_h=no])])
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99 AC_CHECK_TYPES([_Bool])
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100 ])