Another m4 from coreutils

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1050 f882894a-f735-0410-b71e-b25c423dba1c

diff --git a/m4/stdbool.m4 b/m4/stdbool.m4
new file mode 100644 (file)
index 0000000..ed000c8
--- /dev/null
+++ b/m4/stdbool.m4
@@ -0,0 +1,89 @@
+# Check for stdbool.h that conforms to C99.
+
+# Copyright (C) 2002-2003 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA.
+
+# 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])
+])
+
+# This macro is only needed in autoconf <= 2.54.  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: false 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];
+       ],
+       [ return !a + !b + !c + !d + !e + !f + !g + !h + !i; ],
+       [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])