118 lines
3.8 KiB
Plaintext
118 lines
3.8 KiB
Plaintext
|
# Check for stdbool.h that conforms to C99.
|
||
|
|
|
||
|
|
dnl Copyright (C) 2002-2006, 2009-2022 Free Software Foundation, Inc.
|
||
|
|
dnl This file is free software; the Free Software Foundation
|
||
|
|
dnl gives unlimited permission to copy and/or distribute it,
|
||
|
|
dnl with or without modifications, as long as this notice is preserved.
|
||
|
|
|
||
|
|
#serial 9
|
||
|
|
|
||
|
|
# Prepare for substituting <stdbool.h> if it is not supported.
|
||
|
|
|
||
|
|
AC_DEFUN([gl_STDBOOL_H],
|
||
|
|
[
|
||
|
|
AC_REQUIRE([AC_CHECK_HEADER_STDBOOL])
|
||
|
|
AC_REQUIRE([AC_CANONICAL_HOST])
|
||
|
|
|
||
|
|
dnl On some platforms, <stdbool.h> does not exist or does not conform to C99.
|
||
|
|
dnl On Solaris 10 with CC=cc CXX=CC, <stdbool.h> exists but is not usable
|
||
|
|
dnl in C++ mode (and no <cstdbool> exists). In this case, we use our
|
||
|
|
dnl replacement, also in C mode (for binary compatibility between C and C++).
|
||
|
|
if test "$ac_cv_header_stdbool_h" = yes; then
|
||
|
|
case "$host_os" in
|
||
|
|
solaris*)
|
||
|
|
if test -z "$GCC"; then
|
||
|
|
GL_GENERATE_STDBOOL_H=true
|
||
|
|
else
|
||
|
|
GL_GENERATE_STDBOOL_H=false
|
||
|
|
fi
|
||
|
|
;;
|
||
|
|
*)
|
||
|
|
GL_GENERATE_STDBOOL_H=false
|
||
|
|
;;
|
||
|
|
esac
|
||
|
|
else
|
||
|
|
GL_GENERATE_STDBOOL_H=true
|
||
|
|
fi
|
||
|
|
|
||
|
|
if test "$ac_cv_type__Bool" = yes; then
|
||
|
|
HAVE__BOOL=1
|
||
|
|
else
|
||
|
|
HAVE__BOOL=0
|
||
|
|
fi
|
||
|
|
AC_SUBST([HAVE__BOOL])
|
||
|
|
])
|
||
|
|
|
||
|
|
# This version of the macro is needed in autoconf <= 2.68.
|
||
|
|
|
||
|
|
AC_DEFUN([AC_CHECK_HEADER_STDBOOL],
|
||
|
|
[AC_CACHE_CHECK([for stdbool.h that conforms to C99],
|
||
|
|
[ac_cv_header_stdbool_h],
|
||
|
|
[AC_COMPILE_IFELSE(
|
||
|
|
[AC_LANG_PROGRAM(
|
||
|
|
[[
|
||
|
|
#include <stdbool.h>
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
typedef bool Bool;
|
||
|
|
#else
|
||
|
|
typedef _Bool Bool;
|
||
|
|
#ifndef bool
|
||
|
|
"error: bool is not defined"
|
||
|
|
#endif
|
||
|
|
#ifndef false
|
||
|
|
"error: false is not defined"
|
||
|
|
#endif
|
||
|
|
#if false
|
||
|
|
"error: false is not 0"
|
||
|
|
#endif
|
||
|
|
#ifndef true
|
||
|
|
"error: true is not defined"
|
||
|
|
#endif
|
||
|
|
#if true != 1
|
||
|
|
"error: true is not 1"
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __bool_true_false_are_defined
|
||
|
|
"error: __bool_true_false_are_defined is not defined"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
struct s { Bool s: 1; Bool t; bool u: 1; bool v; } s;
|
||
|
|
|
||
|
|
char a[true == 1 ? 1 : -1];
|
||
|
|
char b[false == 0 ? 1 : -1];
|
||
|
|
char c[__bool_true_false_are_defined == 1 ? 1 : -1];
|
||
|
|
char d[(bool) 0.5 == true ? 1 : -1];
|
||
|
|
/* See body of main program for 'e'. */
|
||
|
|
char f[(Bool) 0.0 == false ? 1 : -1];
|
||
|
|
char g[true];
|
||
|
|
char h[sizeof (Bool)];
|
||
|
|
char i[sizeof s.t];
|
||
|
|
enum { j = false, k = true, l = false * true, m = true * 256 };
|
||
|
|
/* The following fails for
|
||
|
|
HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */
|
||
|
|
Bool n[m];
|
||
|
|
char o[sizeof n == m * sizeof n[0] ? 1 : -1];
|
||
|
|
char p[-1 - (Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
|
||
|
|
/* Catch a bug in an HP-UX C compiler. See
|
||
|
|
https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
|
||
|
|
https://lists.gnu.org/r/bug-coreutils/2005-11/msg00161.html
|
||
|
|
*/
|
||
|
|
Bool q = true;
|
||
|
|
Bool *pq = &q;
|
||
|
|
bool *qq = &q;
|
||
|
|
]],
|
||
|
|
[[
|
||
|
|
bool e = &s;
|
||
|
|
*pq |= q; *pq |= ! q;
|
||
|
|
*qq |= q; *qq |= ! q;
|
||
|
|
/* Refer to every declared value, to avoid compiler optimizations. */
|
||
|
|
return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l
|
||
|
|
+ !m + !n + !o + !p + !q + !pq + !qq);
|
||
|
|
]])],
|
||
|
|
[ac_cv_header_stdbool_h=yes],
|
||
|
|
[ac_cv_header_stdbool_h=no])])
|
||
|
|
AC_CHECK_TYPES([_Bool])
|
||
|
|
])
|