90 lines
2.5 KiB
Plaintext
90 lines
2.5 KiB
Plaintext
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# Check for stdbool.h that conforms to C99.
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# Copyright (C) 2002-2003 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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# 02111-1307, USA.
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# Prepare for substituting <stdbool.h> if it is not supported.
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AC_DEFUN([AM_STDBOOL_H],
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[
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AC_REQUIRE([AC_HEADER_STDBOOL])
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# Define two additional variables used in the Makefile substitution.
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if test "$ac_cv_header_stdbool_h" = yes; then
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STDBOOL_H=''
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else
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STDBOOL_H='stdbool.h'
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fi
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AC_SUBST([STDBOOL_H])
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if test "$ac_cv_type__Bool" = yes; then
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HAVE__BOOL=1
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else
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HAVE__BOOL=0
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fi
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AC_SUBST([HAVE__BOOL])
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])
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# This macro is only needed in autoconf <= 2.54. Newer versions of autoconf
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# have this macro built-in.
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AC_DEFUN([AC_HEADER_STDBOOL],
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[AC_CACHE_CHECK([for stdbool.h that conforms to C99],
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[ac_cv_header_stdbool_h],
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[AC_TRY_COMPILE(
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[
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#include <stdbool.h>
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#ifndef bool
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"error: bool is not defined"
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#endif
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#ifndef false
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"error: false is not defined"
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#endif
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#if false
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"error: false is not 0"
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#endif
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#ifndef true
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"error: false is not defined"
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#endif
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#if true != 1
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"error: true is not 1"
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#endif
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#ifndef __bool_true_false_are_defined
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"error: __bool_true_false_are_defined is not defined"
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#endif
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struct s { _Bool s: 1; _Bool t; } s;
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char a[true == 1 ? 1 : -1];
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char b[false == 0 ? 1 : -1];
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char c[__bool_true_false_are_defined == 1 ? 1 : -1];
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char d[(bool) -0.5 == true ? 1 : -1];
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bool e = &s;
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char f[(_Bool) -0.0 == false ? 1 : -1];
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char g[true];
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char h[sizeof (_Bool)];
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char i[sizeof s.t];
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],
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[ return !a + !b + !c + !d + !e + !f + !g + !h + !i; ],
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[ac_cv_header_stdbool_h=yes],
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[ac_cv_header_stdbool_h=no])])
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AC_CHECK_TYPES([_Bool])
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if test $ac_cv_header_stdbool_h = yes; then
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AC_DEFINE(HAVE_STDBOOL_H, 1, [Define to 1 if stdbool.h conforms to C99.])
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fi])
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