| 1 | # Check for stdbool.h that conforms to C99.
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| 2 |
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| 3 | dnl Copyright (C) 2002-2006, 2009-2021 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 8
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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 | AC_REQUIRE([AC_CANONICAL_HOST])
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| 16 |
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| 17 | dnl On some platforms, <stdbool.h> does not exist or does not conform to C99.
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| 18 | dnl On Solaris 10 with CC=cc CXX=CC, <stdbool.h> exists but is not usable
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| 19 | dnl in C++ mode (and no <cstdbool> exists). In this case, we use our
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| 20 | dnl replacement, also in C mode (for binary compatibility between C and C++).
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| 21 | if test "$ac_cv_header_stdbool_h" = yes; then
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| 22 | case "$host_os" in
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| 23 | solaris*)
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| 24 | if test -z "$GCC"; then
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| 25 | STDBOOL_H='stdbool.h'
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| 26 | else
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| 27 | STDBOOL_H=''
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| 28 | fi
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| 29 | ;;
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| 30 | *)
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| 31 | STDBOOL_H=''
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| 32 | ;;
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| 33 | esac
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| 34 | else
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| 35 | STDBOOL_H='stdbool.h'
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| 36 | fi
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| 37 | AC_SUBST([STDBOOL_H])
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| 38 | AM_CONDITIONAL([GL_GENERATE_STDBOOL_H], [test -n "$STDBOOL_H"])
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| 39 |
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| 40 | if test "$ac_cv_type__Bool" = yes; then
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| 41 | HAVE__BOOL=1
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| 42 | else
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| 43 | HAVE__BOOL=0
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| 44 | fi
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| 45 | AC_SUBST([HAVE__BOOL])
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| 46 | ])
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| 47 |
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| 48 | # AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future.
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| 49 | AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H])
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| 50 |
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| 51 | # This version of the macro is needed in autoconf <= 2.68.
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| 52 |
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| 53 | AC_DEFUN([AC_CHECK_HEADER_STDBOOL],
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| 54 | [AC_CACHE_CHECK([for stdbool.h that conforms to C99],
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| 55 | [ac_cv_header_stdbool_h],
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| 56 | [AC_COMPILE_IFELSE(
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| 57 | [AC_LANG_PROGRAM(
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| 58 | [[
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| 59 | #include <stdbool.h>
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| 60 |
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| 61 | #ifdef __cplusplus
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| 62 | typedef bool Bool;
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| 63 | #else
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| 64 | typedef _Bool Bool;
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| 65 | #ifndef bool
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| 66 | "error: bool is not defined"
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| 67 | #endif
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| 68 | #ifndef false
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| 69 | "error: false is not defined"
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| 70 | #endif
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| 71 | #if false
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| 72 | "error: false is not 0"
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| 73 | #endif
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| 74 | #ifndef true
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| 75 | "error: true is not defined"
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| 76 | #endif
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| 77 | #if true != 1
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| 78 | "error: true is not 1"
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| 79 | #endif
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| 80 | #endif
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| 81 |
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| 82 | #ifndef __bool_true_false_are_defined
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| 83 | "error: __bool_true_false_are_defined is not defined"
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| 84 | #endif
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| 85 |
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| 86 | struct s { Bool s: 1; Bool t; bool u: 1; bool v; } s;
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| 87 |
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| 88 | char a[true == 1 ? 1 : -1];
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| 89 | char b[false == 0 ? 1 : -1];
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| 90 | char c[__bool_true_false_are_defined == 1 ? 1 : -1];
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| 91 | char d[(bool) 0.5 == true ? 1 : -1];
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| 92 | /* See body of main program for 'e'. */
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| 93 | char f[(Bool) 0.0 == false ? 1 : -1];
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| 94 | char g[true];
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| 95 | char h[sizeof (Bool)];
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| 96 | char i[sizeof s.t];
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| 97 | enum { j = false, k = true, l = false * true, m = true * 256 };
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| 98 | /* The following fails for
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| 99 | HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */
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| 100 | Bool n[m];
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| 101 | char o[sizeof n == m * sizeof n[0] ? 1 : -1];
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| 102 | char p[-1 - (Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
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| 103 | /* Catch a bug in an HP-UX C compiler. See
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| 104 | https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
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| 105 | https://lists.gnu.org/r/bug-coreutils/2005-11/msg00161.html
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| 106 | */
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| 107 | Bool q = true;
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| 108 | Bool *pq = &q;
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| 109 | bool *qq = &q;
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| 110 | ]],
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| 111 | [[
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| 112 | bool e = &s;
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| 113 | *pq |= q; *pq |= ! q;
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| 114 | *qq |= q; *qq |= ! q;
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| 115 | /* Refer to every declared value, to avoid compiler optimizations. */
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| 116 | return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l
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| 117 | + !m + !n + !o + !p + !q + !pq + !qq);
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| 118 | ]])],
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| 119 | [ac_cv_header_stdbool_h=yes],
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| 120 | [ac_cv_header_stdbool_h=no])])
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| 121 | AC_CHECK_TYPES([_Bool])
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| 122 | ])
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