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116 lines
3.7 KiB
Plaintext
116 lines
3.7 KiB
Plaintext
# Check for stdbool.h that conforms to C99.
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dnl Copyright (C) 2002-2006, 2009 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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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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# AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future.
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AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H])
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# This macro is only needed in autoconf <= 2.59. 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: true 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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enum { j = false, k = true, l = false * true, m = true * 256 };
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_Bool n[m];
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char o[sizeof n == m * sizeof n[0] ? 1 : -1];
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char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
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#if defined __xlc__ || defined __GNUC__
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/* Catch a bug in IBM AIX xlc compiler version 6.0.0.0
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reported by James Lemley on 2005-10-05; see
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http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html
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This test is not quite right, since xlc is allowed to
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reject this program, as the initializer for xlcbug is
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not one of the forms that C requires support for.
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However, doing the test right would require a run-time
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test, and that would make cross-compilation harder.
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Let us hope that IBM fixes the xlc bug, and also adds
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support for this kind of constant expression. In the
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meantime, this test will reject xlc, which is OK, since
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our stdbool.h substitute should suffice. We also test
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this with GCC, where it should work, to detect more
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quickly whether someone messes up the test in the
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future. */
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char digs[] = "0123456789";
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int xlcbug = 1 / (&(digs + 5)[-2 + (bool) 1] == &digs[4] ? 1 : -1);
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#endif
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/* Catch a bug in an HP-UX C compiler. See
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http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
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http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html
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*/
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_Bool q = true;
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_Bool *pq = &q;
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],
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[
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*pq |= q;
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*pq |= ! q;
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/* Refer to every declared value, to avoid compiler optimizations. */
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return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l
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+ !m + !n + !o + !p + !q + !pq);
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],
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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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