Update byacc to 20130304

1 files changed, 147 insertions, 153 deletions

diff --git a/contrib/byacc/aclocal.m4 b/contrib/byacc/aclocal.m4
index c70dd4b..0741516 100644
--- a/contrib/byacc/aclocal.m4
+++ b/contrib/byacc/aclocal.m4
@@ -1,7 +1,7 @@
-dnl $Id: aclocal.m4,v 1.19 2012/01/13 14:10:56 tom Exp $
+dnl $Id: aclocal.m4,v 1.30 2013/03/05 01:13:39 tom Exp $
 dnl Macros for byacc configure script (Thomas E. Dickey)
 dnl ---------------------------------------------------------------------------
-dnl Copyright 2004-2011,2012 Thomas E. Dickey
+dnl Copyright 2004-2012,2013 Thomas E. Dickey
 dnl 
 dnl Permission is hereby granted, free of charge, to any person obtaining a
 dnl copy of this software and associated documentation files (the
@@ -28,6 +28,32 @@ dnl sale, use or other dealings in this Software without prior written
 dnl authorization.
 dnl ---------------------------------------------------------------------------
 dnl ---------------------------------------------------------------------------
+dnl CF_ACVERSION_CHECK version: 4 updated: 2013/03/04 19:52:56
+dnl ------------------
+dnl Conditionally generate script according to whether we're using a given autoconf.
+dnl
+dnl $1 = version to compare against
+dnl $2 = code to use if AC_ACVERSION is at least as high as $1.
+dnl $3 = code to use if AC_ACVERSION is older than $1.
+define([CF_ACVERSION_CHECK],
+[
+ifdef([AC_ACVERSION], ,[m4_copy([m4_PACKAGE_VERSION],[AC_ACVERSION])])dnl
+ifdef([m4_version_compare],
+[m4_if(m4_version_compare(m4_defn([AC_ACVERSION]), [$1]), -1, [$3], [$2])],
+[CF_ACVERSION_COMPARE(
+AC_PREREQ_CANON(AC_PREREQ_SPLIT([$1])),
+AC_PREREQ_CANON(AC_PREREQ_SPLIT(AC_ACVERSION)), AC_ACVERSION, [$2], [$3])])])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_ACVERSION_COMPARE version: 3 updated: 2012/10/03 18:39:53
+dnl --------------------
+dnl CF_ACVERSION_COMPARE(MAJOR1, MINOR1, TERNARY1,
+dnl                      MAJOR2, MINOR2, TERNARY2,
+dnl                      PRINTABLE2, not FOUND, FOUND)
+define([CF_ACVERSION_COMPARE],
+[ifelse(builtin([eval], [$2 < $5]), 1,
+[ifelse([$8], , ,[$8])],
+[ifelse([$9], , ,[$9])])])dnl
+dnl ---------------------------------------------------------------------------
 dnl CF_ADD_CFLAGS version: 10 updated: 2010/05/26 05:38:42
 dnl -------------
 dnl Copy non-preprocessor flags to $CFLAGS, preprocessor flags to $CPPFLAGS
@@ -116,97 +142,6 @@ AC_SUBST(EXTRA_CPPFLAGS)
 
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_ANSI_CC_CHECK version: 11 updated: 2011/07/01 19:47:45
-dnl ----------------
-dnl This was originally adapted from the macros 'fp_PROG_CC_STDC' and
-dnl 'fp_C_PROTOTYPES' in the sharutils 4.2 distribution.
-AC_DEFUN([CF_ANSI_CC_CHECK],
-[
-# This should have been defined by AC_PROG_CC
-: ${CC:=cc}
-
-# Check for user's environment-breakage by stuffing CFLAGS/CPPFLAGS content
-# into CC.  This will not help with broken scripts that wrap the compiler with
-# options, but eliminates a more common category of user confusion.
-AC_MSG_CHECKING(\$CC variable)
-case "$CC" in #(vi
-*[[\ \	]]-[[IUD]]*)
-	AC_MSG_RESULT(broken)
-	AC_MSG_WARN(your environment misuses the CC variable to hold CFLAGS/CPPFLAGS options)
-	# humor him...
-	cf_flags=`echo "$CC" | sed -e 's/^[[^ 	]]*[[ 	]]//'`
-	CC=`echo "$CC" | sed -e 's/[[ 	]].*//'`
-	CF_ADD_CFLAGS($cf_flags)
-	;;
-*)
-	AC_MSG_RESULT(ok)
-	;;
-esac
-
-AC_CACHE_CHECK(for ${CC:-cc} option to accept ANSI C, cf_cv_ansi_cc,[
-cf_cv_ansi_cc=no
-cf_save_CFLAGS="$CFLAGS"
-cf_save_CPPFLAGS="$CPPFLAGS"
-# Don't try gcc -ansi; that turns off useful extensions and
-# breaks some systems' header files.
-# AIX			-qlanglvl=ansi
-# Ultrix and OSF/1	-std1
-# HP-UX			-Aa -D_HPUX_SOURCE
-# SVR4			-Xc
-# UnixWare 1.2		(cannot use -Xc, since ANSI/POSIX clashes)
-for cf_arg in "-DCC_HAS_PROTOS" \
-	"" \
-	-qlanglvl=ansi \
-	-std1 \
-	-Ae \
-	"-Aa -D_HPUX_SOURCE" \
-	-Xc
-do
-	CF_ADD_CFLAGS($cf_arg)
-	AC_TRY_COMPILE(
-[
-#ifndef CC_HAS_PROTOS
-#if !defined(__STDC__) || (__STDC__ != 1)
-choke me
-#endif
-#endif
-],[
-	int test (int i, double x);
-	struct s1 {int (*f) (int a);};
-	struct s2 {int (*f) (double a);};],
-	[cf_cv_ansi_cc="$cf_arg"; break])
-done
-CFLAGS="$cf_save_CFLAGS"
-CPPFLAGS="$cf_save_CPPFLAGS"
-])
-
-if test "$cf_cv_ansi_cc" != "no"; then
-if test ".$cf_cv_ansi_cc" != ".-DCC_HAS_PROTOS"; then
-	CF_ADD_CFLAGS($cf_cv_ansi_cc)
-else
-	AC_DEFINE(CC_HAS_PROTOS)
-fi
-fi
-])dnl
-dnl ---------------------------------------------------------------------------
-dnl CF_ANSI_CC_REQD version: 4 updated: 2008/03/23 14:48:54
-dnl ---------------
-dnl For programs that must use an ANSI compiler, obtain compiler options that
-dnl will make it recognize prototypes.  We'll do preprocessor checks in other
-dnl macros, since tools such as unproto can fake prototypes, but only part of
-dnl the preprocessor.
-AC_DEFUN([CF_ANSI_CC_REQD],
-[AC_REQUIRE([CF_ANSI_CC_CHECK])
-if test "$cf_cv_ansi_cc" = "no"; then
-	AC_MSG_ERROR(
-[Your compiler does not appear to recognize prototypes.
-You have the following choices:
-	a. adjust your compiler options
-	b. get an up-to-date compiler
-	c. use a wrapper such as unproto])
-fi
-])dnl
-dnl ---------------------------------------------------------------------------
 dnl CF_ARG_DISABLE version: 3 updated: 1999/03/30 17:24:31
 dnl --------------
 dnl Allow user to disable a normally-on option.
@@ -236,7 +171,33 @@ ifelse([$3],,[    :]dnl
 ])dnl
   ])])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_CHECK_CACHE version: 11 updated: 2008/03/23 14:45:59
+dnl CF_CC_ENV_FLAGS version: 1 updated: 2012/10/03 05:25:49
+dnl ---------------
+dnl Check for user's environment-breakage by stuffing CFLAGS/CPPFLAGS content
+dnl into CC.  This will not help with broken scripts that wrap the compiler with
+dnl options, but eliminates a more common category of user confusion.
+AC_DEFUN([CF_CC_ENV_FLAGS],
+[
+# This should have been defined by AC_PROG_CC
+: ${CC:=cc}
+
+AC_MSG_CHECKING(\$CC variable)
+case "$CC" in #(vi
+*[[\ \	]]-[[IUD]]*)
+	AC_MSG_RESULT(broken)
+	AC_MSG_WARN(your environment misuses the CC variable to hold CFLAGS/CPPFLAGS options)
+	# humor him...
+	cf_flags=`echo "$CC" | sed -e 's/^[[^ 	]]*[[ 	]]//'`
+	CC=`echo "$CC" | sed -e 's/[[ 	]].*//'`
+	CF_ADD_CFLAGS($cf_flags)
+	;;
+*)
+	AC_MSG_RESULT(ok)
+	;;
+esac
+])dnl
+dnl ---------------------------------------------------------------------------
+dnl CF_CHECK_CACHE version: 12 updated: 2012/10/02 20:55:03
 dnl --------------
 dnl Check if we're accidentally using a cache from a different machine.
 dnl Derive the system name, as a check for reusing the autoconf cache.
@@ -259,7 +220,7 @@ else
 		system_name="`(hostname) 2>/dev/null`"
 	fi
 fi
-test -n "$system_name" && AC_DEFINE_UNQUOTED(SYSTEM_NAME,"$system_name")
+test -n "$system_name" && AC_DEFINE_UNQUOTED(SYSTEM_NAME,"$system_name",[Define to the system name.])
 AC_CACHE_VAL(cf_cv_system_name,[cf_cv_system_name="$system_name"])
 
 test -z "$system_name" && system_name="$cf_cv_system_name"
@@ -271,7 +232,40 @@ if test ".$system_name" != ".$cf_cv_system_name" ; then
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_DISABLE_ECHO version: 11 updated: 2009/12/13 13:16:57
+dnl CF_CLANG_COMPILER version: 1 updated: 2012/06/16 14:55:39
+dnl -----------------
+dnl Check if the given compiler is really clang.  clang's C driver defines
+dnl __GNUC__ (fooling the configure script into setting $GCC to yes) but does
+dnl not ignore some gcc options.
+dnl
+dnl This macro should be run "soon" after AC_PROG_CC or AC_PROG_CPLUSPLUS, to
+dnl ensure that it is not mistaken for gcc/g++.  It is normally invoked from
+dnl the wrappers for gcc and g++ warnings.
+dnl
+dnl $1 = GCC (default) or GXX
+dnl $2 = INTEL_COMPILER (default) or INTEL_CPLUSPLUS
+dnl $3 = CFLAGS (default) or CXXFLAGS
+AC_DEFUN([CF_CLANG_COMPILER],[
+ifelse([$2],,CLANG_COMPILER,[$2])=no
+
+if test "$ifelse([$1],,[$1],GCC)" = yes ; then
+	AC_MSG_CHECKING(if this is really Clang ifelse([$1],GXX,C++,C) compiler)
+	cf_save_CFLAGS="$ifelse([$3],,CFLAGS,[$3])"
+	ifelse([$3],,CFLAGS,[$3])="$ifelse([$3],,CFLAGS,[$3]) -Qunused-arguments"
+	AC_TRY_COMPILE([],[
+#ifdef __clang__
+#else
+make an error
+#endif
+],[ifelse([$2],,CLANG_COMPILER,[$2])=yes
+cf_save_CFLAGS="$cf_save_CFLAGS -Qunused-arguments"
+],[])
+	ifelse([$3],,CFLAGS,[$3])="$cf_save_CFLAGS"
+	AC_MSG_RESULT($ifelse([$2],,CLANG_COMPILER,[$2]))
+fi
+])
+dnl ---------------------------------------------------------------------------
+dnl CF_DISABLE_ECHO version: 12 updated: 2012/10/06 16:30:28
 dnl ---------------
 dnl You can always use "make -n" to see the actual options, but it's hard to
 dnl pick out/analyze warning messages when the compile-line is long.
@@ -286,7 +280,7 @@ dnl
 AC_DEFUN([CF_DISABLE_ECHO],[
 AC_MSG_CHECKING(if you want to see long compiling messages)
 CF_ARG_DISABLE(echo,
-	[  --disable-echo          display "compiling" commands],
+	[  --disable-echo          do not display "compiling" commands],
 	[
     ECHO_LT='--silent'
     ECHO_LD='@echo linking [$]@;'
@@ -308,7 +302,7 @@ AC_SUBST(SHOW_CC)
 AC_SUBST(ECHO_CC)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_DISABLE_LEAKS version: 6 updated: 2010/07/23 04:14:32
+dnl CF_DISABLE_LEAKS version: 7 updated: 2012/10/02 20:55:03
 dnl ----------------
 dnl Combine no-leak checks with the libraries or tools that are used for the
 dnl checks.
@@ -326,12 +320,12 @@ AC_ARG_ENABLE(leaks,
 AC_MSG_RESULT($with_no_leaks)
 
 if test "$with_no_leaks" = yes ; then
-	AC_DEFINE(NO_LEAKS)
-	AC_DEFINE(YY_NO_LEAKS)
+	AC_DEFINE(NO_LEAKS,1,[Define to 1 if you want to perform memory-leak testing.])
+	AC_DEFINE(YY_NO_LEAKS,1,[Define to 1 if you want to perform memory-leak testing.])
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GCC_ATTRIBUTES version: 14 updated: 2010/10/23 15:52:32
+dnl CF_GCC_ATTRIBUTES version: 16 updated: 2012/10/02 20:55:03
 dnl -----------------
 dnl Test for availability of useful gcc __attribute__ directives to quiet
 dnl compiler warnings.  Though useful, not all are supported -- and contrary
@@ -409,27 +403,27 @@ EOF
 			test -n "$verbose" && AC_MSG_RESULT(... $cf_attribute)
 			cat conftest.h >>confdefs.h
 			case $cf_attribute in #(vi
+			noreturn) #(vi
+				AC_DEFINE_UNQUOTED(GCC_NORETURN,$cf_directive,[Define to noreturn-attribute for gcc])
+				;;
 			printf) #(vi
-				if test "$cf_printf_attribute" = no ; then
-					cat >>confdefs.h <<EOF
-#define GCC_PRINTFLIKE(fmt,var) /* nothing */
-EOF
-				else
-					cat >>confdefs.h <<EOF
-#define GCC_PRINTFLIKE(fmt,var) __attribute__((format(printf,fmt,var)))
-EOF
+				cf_value='/* nothing */'
+				if test "$cf_printf_attribute" != no ; then
+					cf_value='__attribute__((format(printf,fmt,var)))'
+					AC_DEFINE(GCC_PRINTF,1,[Define to 1 if the compiler supports gcc-like printf attribute.])
 				fi
+				AC_DEFINE_UNQUOTED(GCC_PRINTFLIKE(fmt,var),$cf_value,[Define to printf-attribute for gcc])
 				;;
 			scanf) #(vi
-				if test "$cf_scanf_attribute" = no ; then
-					cat >>confdefs.h <<EOF
-#define GCC_SCANFLIKE(fmt,var) /* nothing */
-EOF
-				else
-					cat >>confdefs.h <<EOF
-#define GCC_SCANFLIKE(fmt,var)  __attribute__((format(scanf,fmt,var)))
-EOF
+				cf_value='/* nothing */'
+				if test "$cf_scanf_attribute" != no ; then
+					cf_value='__attribute__((format(scanf,fmt,var)))'
+					AC_DEFINE(GCC_SCANF,1,[Define to 1 if the compiler supports gcc-like scanf attribute.])
 				fi
+				AC_DEFINE_UNQUOTED(GCC_SCANFLIKE(fmt,var),$cf_value,[Define to sscanf-attribute for gcc])
+				;;
+			unused) #(vi
+				AC_DEFINE_UNQUOTED(GCC_UNUSED,$cf_directive,[Define to unused-attribute for gcc])
 				;;
 			esac
 		fi
@@ -441,7 +435,7 @@ rm -rf conftest*
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GCC_VERSION version: 5 updated: 2010/04/24 11:02:31
+dnl CF_GCC_VERSION version: 7 updated: 2012/10/18 06:46:33
 dnl --------------
 dnl Find version of gcc
 AC_DEFUN([CF_GCC_VERSION],[
@@ -449,13 +443,13 @@ AC_REQUIRE([AC_PROG_CC])
 GCC_VERSION=none
 if test "$GCC" = yes ; then
 	AC_MSG_CHECKING(version of $CC)
-	GCC_VERSION="`${CC} --version 2>/dev/null | sed -e '2,$d' -e 's/^.*(GCC) //' -e 's/^[[^0-9.]]*//' -e 's/[[^0-9.]].*//'`"
+	GCC_VERSION="`${CC} --version 2>/dev/null | sed -e '2,$d' -e 's/^.*(GCC[[^)]]*) //' -e 's/^.*(Debian[[^)]]*) //' -e 's/^[[^0-9.]]*//' -e 's/[[^0-9.]].*//'`"
 	test -z "$GCC_VERSION" && GCC_VERSION=unknown
 	AC_MSG_RESULT($GCC_VERSION)
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_GCC_WARNINGS version: 27 updated: 2010/10/23 15:52:32
+dnl CF_GCC_WARNINGS version: 29 updated: 2012/06/16 14:55:39
 dnl ---------------
 dnl Check if the compiler supports useful warning options.  There's a few that
 dnl we don't use, simply because they're too noisy:
@@ -478,6 +472,7 @@ AC_DEFUN([CF_GCC_WARNINGS],
 [
 AC_REQUIRE([CF_GCC_VERSION])
 CF_INTEL_COMPILER(GCC,INTEL_COMPILER,CFLAGS)
+CF_CLANG_COMPILER(GCC,CLANG_COMPILER,CFLAGS)
 
 cat > conftest.$ac_ext <<EOF
 #line __oline__ "${as_me:-configure}"
@@ -553,6 +548,13 @@ then
 					continue;;
 				esac
 				;;
+			Wpointer-arith) #(vi
+				case $GCC_VERSION in
+				[[12]].*)
+					CF_VERBOSE(feature is broken in gcc $GCC_VERSION)
+					continue;;
+				esac
+				;;
 			esac
 			EXTRA_CFLAGS="$EXTRA_CFLAGS -$cf_opt"
 		fi
@@ -594,7 +596,7 @@ make an error
 test "$cf_cv_gnu_source" = yes && CPPFLAGS="$CPPFLAGS -D_GNU_SOURCE"
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_INTEL_COMPILER version: 4 updated: 2010/05/26 05:38:42
+dnl CF_INTEL_COMPILER version: 5 updated: 2013/02/10 10:41:05
 dnl -----------------
 dnl Check if the given compiler is really the Intel compiler for Linux.  It
 dnl tries to imitate gcc, but does not return an error when it finds a mismatch
@@ -608,6 +610,7 @@ dnl $1 = GCC (default) or GXX
 dnl $2 = INTEL_COMPILER (default) or INTEL_CPLUSPLUS
 dnl $3 = CFLAGS (default) or CXXFLAGS
 AC_DEFUN([CF_INTEL_COMPILER],[
+AC_REQUIRE([AC_CANONICAL_HOST])
 ifelse([$2],,INTEL_COMPILER,[$2])=no
 
 if test "$ifelse([$1],,[$1],GCC)" = yes ; then
@@ -668,7 +671,7 @@ AC_SUBST(MAKE_UPPER_TAGS)
 AC_SUBST(MAKE_LOWER_TAGS)
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_MIXEDCASE_FILENAMES version: 3 updated: 2003/09/20 17:07:55
+dnl CF_MIXEDCASE_FILENAMES version: 4 updated: 2012/10/02 20:55:03
 dnl ----------------------
 dnl Check if the file-system supports mixed-case filenames.  If we're able to
 dnl create a lowercase name and see it as uppercase, it doesn't support that.
@@ -695,10 +698,10 @@ else
 	rm -f conftest CONFTEST
 fi
 ])
-test "$cf_cv_mixedcase" = yes && AC_DEFINE(MIXEDCASE_FILENAMES)
+test "$cf_cv_mixedcase" = yes && AC_DEFINE(MIXEDCASE_FILENAMES,1,[Define to 1 if filesystem supports mixed-case filenames.])
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_MKSTEMP version: 7 updated: 2010/08/14 18:25:37
+dnl CF_MKSTEMP version: 9 updated: 2012/10/03 04:34:49
 dnl ----------
 dnl Check for a working mkstemp.  This creates two files, checks that they are
 dnl successfully created and distinct (AmigaOS apparently fails on the last).
@@ -740,11 +743,13 @@ int main()
 }
 ],[cf_cv_func_mkstemp=yes
 ],[cf_cv_func_mkstemp=no
-],[AC_CHECK_FUNC(mkstemp)
-])
+],[cf_cv_func_mkstemp=maybe])
 ])
+if test "x$cf_cv_func_mkstemp" = xmaybe ; then
+	AC_CHECK_FUNC(mkstemp)
+fi
 if test "x$cf_cv_func_mkstemp" = xyes || test "x$ac_cv_func_mkstemp" = xyes ; then
-	AC_DEFINE(HAVE_MKSTEMP)
+	AC_DEFINE(HAVE_MKSTEMP,1,[Define to 1 if mkstemp() is available and working.])
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
@@ -756,14 +761,14 @@ AC_DEFUN([CF_MSG_LOG],[
 echo "${as_me:-configure}:__oline__: testing $* ..." 1>&AC_FD_CC
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_NO_LEAKS_OPTION version: 4 updated: 2006/12/16 14:24:05
+dnl CF_NO_LEAKS_OPTION version: 5 updated: 2012/10/02 20:55:03
 dnl ------------------
 dnl see CF_WITH_NO_LEAKS
 AC_DEFUN([CF_NO_LEAKS_OPTION],[
 AC_MSG_CHECKING(if you want to use $1 for testing)
 AC_ARG_WITH($1,
 	[$2],
-	[AC_DEFINE($3)ifelse([$4],,[
+	[AC_DEFINE_UNQUOTED($3,1,"Define to 1 if you want to use $1 for testing.")ifelse([$4],,[
 	 $4
 ])
 	: ${with_cflags:=-g}
@@ -858,29 +863,17 @@ fi
 
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_PROG_EXT version: 10 updated: 2004/01/03 19:28:18
-dnl -----------
-dnl Compute $PROG_EXT, used for non-Unix ports, such as OS/2 EMX.
-AC_DEFUN([CF_PROG_EXT],
-[
-AC_REQUIRE([CF_CHECK_CACHE])
-case $cf_cv_system_name in
-os2*)
-    CFLAGS="$CFLAGS -Zmt"
-    CPPFLAGS="$CPPFLAGS -D__ST_MT_ERRNO__"
-    CXXFLAGS="$CXXFLAGS -Zmt"
-    # autoconf's macro sets -Zexe and suffix both, which conflict:w
-    LDFLAGS="$LDFLAGS -Zmt -Zcrtdll"
-    ac_cv_exeext=.exe
-    ;;
-esac
-
-AC_EXEEXT
-AC_OBJEXT
-
-PROG_EXT="$EXEEXT"
-AC_SUBST(PROG_EXT)
-test -n "$PROG_EXT" && AC_DEFINE_UNQUOTED(PROG_EXT,"$PROG_EXT")
+dnl CF_PROG_CC version: 3 updated: 2012/10/06 15:31:55
+dnl ----------
+dnl standard check for CC, plus followup sanity checks
+dnl $1 = optional parameter to pass to AC_PROG_CC to specify compiler name
+AC_DEFUN([CF_PROG_CC],[
+ifelse($1,,[AC_PROG_CC],[AC_PROG_CC($1)])
+CF_GCC_VERSION
+CF_ACVERSION_CHECK(2.52,
+	[AC_PROG_CC_STDC],
+	[CF_ANSI_CC_REQD])
+CF_CC_ENV_FLAGS 
 ])dnl
 dnl ---------------------------------------------------------------------------
 dnl CF_PROG_LINT version: 2 updated: 2009/08/12 04:43:14
@@ -1025,7 +1018,7 @@ fi
 fi
 ])dnl
 dnl ---------------------------------------------------------------------------
-dnl CF_XOPEN_SOURCE version: 42 updated: 2012/01/07 08:26:49
+dnl CF_XOPEN_SOURCE version: 43 updated: 2013/02/10 10:41:05
 dnl ---------------
 dnl Try to get _XOPEN_SOURCE defined properly that we can use POSIX functions,
 dnl or adapt to the vendor's definitions to get equivalent functionality,
@@ -1035,6 +1028,7 @@ dnl Parameters:
 dnl	$1 is the nominal value for _XOPEN_SOURCE
 dnl	$2 is the nominal value for _POSIX_C_SOURCE
 AC_DEFUN([CF_XOPEN_SOURCE],[
+AC_REQUIRE([AC_CANONICAL_HOST])
 
 cf_XOPEN_SOURCE=ifelse([$1],,500,[$1])
 cf_POSIX_C_SOURCE=ifelse([$2],,199506L,[$2])