+++ /dev/null
-# Check for stdbool.h that conforms to C99.
-
-dnl Copyright (C) 2002-2006, 2009 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.
-
-# Prepare for substituting <stdbool.h> if it is not supported.
-
-AC_DEFUN([AM_STDBOOL_H],
-[
- AC_REQUIRE([AC_HEADER_STDBOOL])
-
- # Define two additional variables used in the Makefile substitution.
-
- if test "$ac_cv_header_stdbool_h" = yes; then
- STDBOOL_H=''
- else
- STDBOOL_H='stdbool.h'
- fi
- AC_SUBST([STDBOOL_H])
-
- if test "$ac_cv_type__Bool" = yes; then
- HAVE__BOOL=1
- else
- HAVE__BOOL=0
- fi
- AC_SUBST([HAVE__BOOL])
-])
-
-# AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future.
-AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H])
-
-# This macro is only needed in autoconf <= 2.59. Newer versions of autoconf
-# have this macro built-in.
-
-AC_DEFUN([AC_HEADER_STDBOOL],
- [AC_CACHE_CHECK([for stdbool.h that conforms to C99],
- [ac_cv_header_stdbool_h],
- [AC_TRY_COMPILE(
- [
- #include <stdbool.h>
- #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
- #ifndef __bool_true_false_are_defined
- "error: __bool_true_false_are_defined is not defined"
- #endif
-
- struct s { _Bool s: 1; _Bool t; } 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];
- bool e = &s;
- 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 };
- _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];
- #if defined __xlc__ || defined __GNUC__
- /* Catch a bug in IBM AIX xlc compiler version 6.0.0.0
- reported by James Lemley on 2005-10-05; see
- http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html
- This test is not quite right, since xlc is allowed to
- reject this program, as the initializer for xlcbug is
- not one of the forms that C requires support for.
- However, doing the test right would require a run-time
- test, and that would make cross-compilation harder.
- Let us hope that IBM fixes the xlc bug, and also adds
- support for this kind of constant expression. In the
- meantime, this test will reject xlc, which is OK, since
- our stdbool.h substitute should suffice. We also test
- this with GCC, where it should work, to detect more
- quickly whether someone messes up the test in the
- future. */
- char digs[] = "0123456789";
- int xlcbug = 1 / (&(digs + 5)[-2 + (bool) 1] == &digs[4] ? 1 : -1);
- #endif
- /* Catch a bug in an HP-UX C compiler. See
- http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
- http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html
- */
- _Bool q = true;
- _Bool *pq = &q;
- ],
- [
- *pq |= q;
- *pq |= ! 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);
- ],
- [ac_cv_header_stdbool_h=yes],
- [ac_cv_header_stdbool_h=no])])
- AC_CHECK_TYPES([_Bool])
- if test $ac_cv_header_stdbool_h = yes; then
- AC_DEFINE([HAVE_STDBOOL_H], [1], [Define to 1 if stdbool.h conforms to C99.])
- fi])
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