X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fstdbool.m4;h=b25b7d2440b8c970f5d657d3c902ce3a4a9eaf4b;hb=be1c8adeedf52b5ceee7091a43c1937ea2caaa7d;hp=def6e147f8ab06c362a6217e5eae4646022ef4ea;hpb=e059c2358aad79ce8dfd9581dd6f12ce8503dc63;p=gnulib.git

diff --git a/m4/stdbool.m4 b/m4/stdbool.m4
index def6e147f..b25b7d244 100644
--- a/m4/stdbool.m4
+++ b/m4/stdbool.m4
@@ -1,6 +1,6 @@
 # Check for stdbool.h that conforms to C99.
 
-# Copyright (C) 2002 Free Software Foundation, Inc.
+# Copyright (C) 2002-2004 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
@@ -17,7 +17,30 @@
 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 # 02111-1307, USA.
 
-# This file is only needed in autoconf <= 2.54.  Newer versions of autoconf
+# 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 <= 2.59.  Newer versions of autoconf
 # have this macro built-in.
 
 AC_DEFUN([AC_HEADER_STDBOOL],
@@ -36,7 +59,7 @@ AC_DEFUN([AC_HEADER_STDBOOL],
 	   "error: false is not 0"
 	  #endif
 	  #ifndef true
-	   "error: false is not defined"
+	   "error: true is not defined"
 	  #endif
 	  #if true != 1
 	   "error: true is not 1"
@@ -56,8 +79,14 @@ AC_DEFUN([AC_HEADER_STDBOOL],
 	  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];
+	],
+	[
+	  return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !j + !k + !l
+		  + !m + !n + !o);
 	],
-	[ 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])