2N/A# Check for stdbool.h that conforms to C99.

2N/A

2N/Adnl Copyright (C) 2002-2006, 2009-2010 Free Software Foundation, Inc.

2N/Adnl This file is free software; the Free Software Foundation

2N/Adnl gives unlimited permission to copy and/or distribute it,

2N/Adnl with or without modifications, as long as this notice is preserved.

2N/A

2N/A#serial 3

2N/A

2N/A# Prepare for substituting <stdbool.h> if it is not supported.

2N/A

2N/AAC_DEFUN([AM_STDBOOL_H],

2N/A[

2N/A AC_REQUIRE([AC_HEADER_STDBOOL])

2N/A

2N/A # Define two additional variables used in the Makefile substitution.

2N/A

2N/A if test "$ac_cv_header_stdbool_h" = yes; then

2N/A STDBOOL_H=''

2N/A else

2N/A STDBOOL_H='stdbool.h'

2N/A fi

2N/A AC_SUBST([STDBOOL_H])

2N/A

2N/A if test "$ac_cv_type__Bool" = yes; then

2N/A HAVE__BOOL=1

2N/A else

2N/A HAVE__BOOL=0

2N/A fi

2N/A AC_SUBST([HAVE__BOOL])

2N/A])

2N/A

2N/A# AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future.

2N/AAC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H])

2N/A

2N/A# This version of the macro is needed in autoconf <= 2.67. Autoconf has

2N/A# it built in since 2.60, but we want the tweaks from the 2.68 version

2N/A# to avoid rejecting xlc and clang due to relying on extensions.

2N/A

2N/AAC_DEFUN([AC_HEADER_STDBOOL],

2N/A [AC_CACHE_CHECK([for stdbool.h that conforms to C99],

2N/A [ac_cv_header_stdbool_h],

2N/A [AC_COMPILE_IFELSE(

2N/A [AC_LANG_PROGRAM(

2N/A [[

2N/A #include <stdbool.h>

2N/A #ifndef bool

2N/A "error: bool is not defined"

2N/A #endif

2N/A #ifndef false

2N/A "error: false is not defined"

2N/A #endif

2N/A #if false

2N/A "error: false is not 0"

2N/A #endif

2N/A #ifndef true

2N/A "error: true is not defined"

2N/A #endif

2N/A #if true != 1

2N/A "error: true is not 1"

2N/A #endif

2N/A #ifndef __bool_true_false_are_defined

2N/A "error: __bool_true_false_are_defined is not defined"

2N/A #endif

2N/A

2N/A struct s { _Bool s: 1; _Bool t; } s;

2N/A

2N/A char a[true == 1 ? 1 : -1];

2N/A char b[false == 0 ? 1 : -1];

2N/A char c[__bool_true_false_are_defined == 1 ? 1 : -1];

2N/A char d[(bool) 0.5 == true ? 1 : -1];

2N/A /* See body of main program for 'e'. */

2N/A char f[(_Bool) 0.0 == false ? 1 : -1];

2N/A char g[true];

2N/A char h[sizeof (_Bool)];

2N/A char i[sizeof s.t];

2N/A enum { j = false, k = true, l = false * true, m = true * 256 };

2N/A /* The following fails for

2N/A HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */

2N/A _Bool n[m];

2N/A char o[sizeof n == m * sizeof n[0] ? 1 : -1];

2N/A char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];

2N/A /* Catch a bug in an HP-UX C compiler. See

2N/A http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html

2N/A http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html

2N/A */

2N/A _Bool q = true;

2N/A _Bool *pq = &q;

2N/A ]],

2N/A [[

2N/A bool e = &s;

2N/A *pq |= q;

2N/A *pq |= ! q;

2N/A /* Refer to every declared value, to avoid compiler optimizations. */

2N/A return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l

2N/A + !m + !n + !o + !p + !q + !pq);

2N/A ]])],

2N/A [ac_cv_header_stdbool_h=yes],

2N/A [ac_cv_header_stdbool_h=no])])

2N/A AC_CHECK_TYPES([_Bool])

2N/A if test $ac_cv_header_stdbool_h = yes; then

2N/A AC_DEFINE([HAVE_STDBOOL_H], [1], [Define to 1 if stdbool.h conforms to C99.])

2N/A fi])