* unix/configure.in (Darwin): use Darwin SUSv3 extensions if

					available.
	* unix/configure:		autoconf-2.59
	* unix/tkConfig.h.in:		autoheader-2.59

3 files changed, 352 insertions, 6 deletions

diff --git a/unix/configure b/unix/configure
index 882d587..894c350 100755
--- a/unix/configure
+++ b/unix/configure
@@ -9190,6 +9190,304 @@ fi
 echo "$as_me:$LINENO: result: $tcl_cv_ld_weak_l" >&5
 echo "${ECHO_T}$tcl_cv_ld_weak_l" >&6
     fi
+
+for ac_header in AvailabilityMacros.h
+do
+as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
+if eval "test \"\${$as_ac_Header+set}\" = set"; then
+  echo "$as_me:$LINENO: checking for $ac_header" >&5
+echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6
+if eval "test \"\${$as_ac_Header+set}\" = set"; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+fi
+echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_Header'}'`" >&5
+echo "${ECHO_T}`eval echo '${'$as_ac_Header'}'`" >&6
+else
+  # Is the header compilable?
+echo "$as_me:$LINENO: checking $ac_header usability" >&5
+echo $ECHO_N "checking $ac_header usability... $ECHO_C" >&6
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+$ac_includes_default
+#include <$ac_header>
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_header_compiler=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_header_compiler=no
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
+echo "${ECHO_T}$ac_header_compiler" >&6
+
+# Is the header present?
+echo "$as_me:$LINENO: checking $ac_header presence" >&5
+echo $ECHO_N "checking $ac_header presence... $ECHO_C" >&6
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <$ac_header>
+_ACEOF
+if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5
+  (eval $ac_cpp conftest.$ac_ext) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } >/dev/null; then
+  if test -s conftest.err; then
+    ac_cpp_err=$ac_c_preproc_warn_flag
+    ac_cpp_err=$ac_cpp_err$ac_c_werror_flag
+  else
+    ac_cpp_err=
+  fi
+else
+  ac_cpp_err=yes
+fi
+if test -z "$ac_cpp_err"; then
+  ac_header_preproc=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+  ac_header_preproc=no
+fi
+rm -f conftest.err conftest.$ac_ext
+echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
+echo "${ECHO_T}$ac_header_preproc" >&6
+
+# So?  What about this header?
+case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
+  yes:no: )
+    { echo "$as_me:$LINENO: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&5
+echo "$as_me: WARNING: $ac_header: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: proceeding with the compiler's result" >&5
+echo "$as_me: WARNING: $ac_header: proceeding with the compiler's result" >&2;}
+    ac_header_preproc=yes
+    ;;
+  no:yes:* )
+    { echo "$as_me:$LINENO: WARNING: $ac_header: present but cannot be compiled" >&5
+echo "$as_me: WARNING: $ac_header: present but cannot be compiled" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header:     check for missing prerequisite headers?" >&5
+echo "$as_me: WARNING: $ac_header:     check for missing prerequisite headers?" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: see the Autoconf documentation" >&5
+echo "$as_me: WARNING: $ac_header: see the Autoconf documentation" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header:     section \"Present But Cannot Be Compiled\"" >&5
+echo "$as_me: WARNING: $ac_header:     section \"Present But Cannot Be Compiled\"" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: proceeding with the preprocessor's result" >&5
+echo "$as_me: WARNING: $ac_header: proceeding with the preprocessor's result" >&2;}
+    { echo "$as_me:$LINENO: WARNING: $ac_header: in the future, the compiler will take precedence" >&5
+echo "$as_me: WARNING: $ac_header: in the future, the compiler will take precedence" >&2;}
+    (
+      cat <<\_ASBOX
+## ----------------------------- ##
+## Report this to the tk lists.  ##
+## ----------------------------- ##
+_ASBOX
+    ) |
+      sed "s/^/$as_me: WARNING:     /" >&2
+    ;;
+esac
+echo "$as_me:$LINENO: checking for $ac_header" >&5
+echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6
+if eval "test \"\${$as_ac_Header+set}\" = set"; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  eval "$as_ac_Header=\$ac_header_preproc"
+fi
+echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_Header'}'`" >&5
+echo "${ECHO_T}`eval echo '${'$as_ac_Header'}'`" >&6
+
+fi
+if test `eval echo '${'$as_ac_Header'}'` = yes; then
+  cat >>confdefs.h <<_ACEOF
+#define `echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+
+done
+
+    if test "$ac_cv_header_AvailabilityMacros_h" = yes; then
+	echo "$as_me:$LINENO: checking if weak import is available" >&5
+echo $ECHO_N "checking if weak import is available... $ECHO_C" >&6
+if test "${tcl_cv_cc_weak_import+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+
+	    hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -Werror"
+	    cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+		    #ifdef __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
+		    #if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1020
+		    #error __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1020
+		    #endif
+		    #elif MAC_OS_X_VERSION_MIN_REQUIRED < 1020
+		    #error MAC_OS_X_VERSION_MIN_REQUIRED < 1020
+		    #endif
+		    int rand(void) __attribute__((weak_import));
+
+int
+main ()
+{
+rand();
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  tcl_cv_cc_weak_import=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+tcl_cv_cc_weak_import=no
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+	    CFLAGS=$hold_cflags
+fi
+echo "$as_me:$LINENO: result: $tcl_cv_cc_weak_import" >&5
+echo "${ECHO_T}$tcl_cv_cc_weak_import" >&6
+	if test $tcl_cv_cc_weak_import = yes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_WEAK_IMPORT 1
+_ACEOF
+
+	fi
+	echo "$as_me:$LINENO: checking if Darwin SUSv3 extensions are available" >&5
+echo $ECHO_N "checking if Darwin SUSv3 extensions are available... $ECHO_C" >&6
+if test "${tcl_cv_cc_darwin_c_source+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+
+	    hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -Werror"
+	    cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+		    #ifdef __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
+		    #if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1050
+		    #error __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1050
+		    #endif
+		    #elif MAC_OS_X_VERSION_MIN_REQUIRED < 1050
+		    #error MAC_OS_X_VERSION_MIN_REQUIRED < 1050
+		    #endif
+		    #define _DARWIN_C_SOURCE 1
+		    #include <sys/cdefs.h>
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  tcl_cv_cc_darwin_c_source=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+tcl_cv_cc_darwin_c_source=no
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+	    CFLAGS=$hold_cflags
+fi
+echo "$as_me:$LINENO: result: $tcl_cv_cc_darwin_c_source" >&5
+echo "${ECHO_T}$tcl_cv_cc_darwin_c_source" >&6
+	if test $tcl_cv_cc_darwin_c_source = yes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define _DARWIN_C_SOURCE 1
+_ACEOF
+
+	fi
+    fi
 else
     tk_aqua=no
 fi
@@ -10521,7 +10819,7 @@ echo "${ECHO_T}static library" >&6
     echo "$LDFLAGS " | grep -q -- '-prebind ' && TK_SHLIB_LD_EXTRAS="${TK_SHLIB_LD_EXTRAS}"' -seg1addr 0xb000000'
     TK_SHLIB_LD_EXTRAS="${TK_SHLIB_LD_EXTRAS}"' -sectcreate __TEXT __info_plist Tk-Info.plist'
     EXTRA_WISH_LIBS='-sectcreate __TEXT __info_plist Wish-Info.plist'
-    EXTRA_APP_CC_SWITCHES='-mdynamic-no-pic'
+    EXTRA_APP_CC_SWITCHES="${EXTRA_APP_CC_SWITCHES}"' -mdynamic-no-pic'
                         ac_config_files="$ac_config_files Tk-Info.plist:../macosx/Tk-Info.plist.in Wish-Info.plist:../macosx/Wish-Info.plist.in"
 
     for l in ${LOCALES}; do CFBUNDLELOCALIZATIONS="${CFBUNDLELOCALIZATIONS}<string>$l</string>"; done
@@ -10572,7 +10870,7 @@ _ACEOF
     # needs to go into the Makefile even when using autoheader, so that we
     # can pick up a potential make override of VERSION. Also, don't put this
     # into CFLAGS as it should not go into tkConfig.sh
-    EXTRA_CC_SWITCHES='-DTK_FRAMEWORK_VERSION=\"$(VERSION)\"'
+    EXTRA_CC_SWITCHES="$EXTRA_CC_SWITCHES"' -DTK_FRAMEWORK_VERSION=\"$(VERSION)\"'
 else
     # libdir must be a fully qualified path and not ${exec_prefix}/lib
     eval libdir="$libdir"
@@ -10694,7 +10992,7 @@ TK_SHARED_BUILD=${SHARED_BUILD}
 
 
 
-                    ac_config_files="$ac_config_files Makefile:../unix/Makefile.in tkConfig.sh:../unix/tkConfig.sh.in tk.pc:../unix/tk.pc.in"
+                              ac_config_files="$ac_config_files Makefile:../unix/Makefile.in tkConfig.sh:../unix/tkConfig.sh.in tk.pc:../unix/tk.pc.in"
 
 cat >confcache <<\_ACEOF
 # This file is a shell script that caches the results of configure
diff --git a/unix/configure.in b/unix/configure.in
index b51b287..4feb5fb 100644
--- a/unix/configure.in
+++ b/unix/configure.in
@@ -3,7 +3,7 @@ dnl	This file is an input file used by the GNU "autoconf" program to
 dnl	generate the file "configure", which is run during Tk installation
 dnl	to configure the system for the local environment.
 #
-# RCS: @(#) $Id: configure.in,v 1.163 2009/03/14 17:35:04 dkf Exp $
+# RCS: @(#) $Id: configure.in,v 1.164 2009/04/10 18:01:39 das Exp $
 
 AC_INIT([tk],[8.6])
 AC_PREREQ(2.59)
@@ -315,6 +315,45 @@ if test "`uname -s`" = "Darwin" ; then
 		tcl_cv_ld_weak_l=yes, tcl_cv_ld_weak_l=no)
 	    LDFLAGS=$hold_ldflags])
     fi
+    AC_CHECK_HEADERS(AvailabilityMacros.h)
+    if test "$ac_cv_header_AvailabilityMacros_h" = yes; then
+	AC_CACHE_CHECK([if weak import is available], tcl_cv_cc_weak_import, [
+	    hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -Werror"
+	    AC_TRY_LINK([
+		    #ifdef __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
+		    #if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1020
+		    #error __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1020
+		    #endif
+		    #elif MAC_OS_X_VERSION_MIN_REQUIRED < 1020
+		    #error MAC_OS_X_VERSION_MIN_REQUIRED < 1020
+		    #endif
+		    int rand(void) __attribute__((weak_import));
+		], [rand();],
+		tcl_cv_cc_weak_import=yes, tcl_cv_cc_weak_import=no)
+	    CFLAGS=$hold_cflags])
+	if test $tcl_cv_cc_weak_import = yes; then
+	    AC_DEFINE(HAVE_WEAK_IMPORT, 1, [Is weak import available?])
+	fi
+	AC_CACHE_CHECK([if Darwin SUSv3 extensions are available],
+	    tcl_cv_cc_darwin_c_source, [
+	    hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -Werror"
+	    AC_TRY_COMPILE([
+		    #ifdef __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
+		    #if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1050
+		    #error __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1050
+		    #endif
+		    #elif MAC_OS_X_VERSION_MIN_REQUIRED < 1050
+		    #error MAC_OS_X_VERSION_MIN_REQUIRED < 1050
+		    #endif
+		    #define _DARWIN_C_SOURCE 1
+		    #include <sys/cdefs.h>
+		],,tcl_cv_cc_darwin_c_source=yes, tcl_cv_cc_darwin_c_source=no)
+	    CFLAGS=$hold_cflags])
+	if test $tcl_cv_cc_darwin_c_source = yes; then
+	    AC_DEFINE(_DARWIN_C_SOURCE, 1,
+		    [Are Darwin SUSv3 extensions available?])
+	fi
+    fi
 else
     tk_aqua=no
 fi
@@ -572,7 +611,7 @@ if test "`uname -s`" = "Darwin" ; then
     echo "$LDFLAGS " | grep -q -- '-prebind ' && TK_SHLIB_LD_EXTRAS="${TK_SHLIB_LD_EXTRAS}"' -seg1addr 0xb000000'
     TK_SHLIB_LD_EXTRAS="${TK_SHLIB_LD_EXTRAS}"' -sectcreate __TEXT __info_plist Tk-Info.plist'
     EXTRA_WISH_LIBS='-sectcreate __TEXT __info_plist Wish-Info.plist'
-    EXTRA_APP_CC_SWITCHES='-mdynamic-no-pic'
+    EXTRA_APP_CC_SWITCHES="${EXTRA_APP_CC_SWITCHES}"' -mdynamic-no-pic'
     AC_CONFIG_FILES([Tk-Info.plist:../macosx/Tk-Info.plist.in Wish-Info.plist:../macosx/Wish-Info.plist.in])
     for l in ${LOCALES}; do CFBUNDLELOCALIZATIONS="${CFBUNDLELOCALIZATIONS}<string>$l</string>"; done
     TK_YEAR="`date +%Y`"
@@ -624,7 +663,7 @@ if test "$FRAMEWORK_BUILD" = "1" ; then
     # needs to go into the Makefile even when using autoheader, so that we  
     # can pick up a potential make override of VERSION. Also, don't put this
     # into CFLAGS as it should not go into tkConfig.sh
-    EXTRA_CC_SWITCHES='-DTK_FRAMEWORK_VERSION=\"$(VERSION)\"'
+    EXTRA_CC_SWITCHES="$EXTRA_CC_SWITCHES"' -DTK_FRAMEWORK_VERSION=\"$(VERSION)\"'
 else
     # libdir must be a fully qualified path and not ${exec_prefix}/lib
     eval libdir="$libdir"
diff --git a/unix/tkConfig.h.in b/unix/tkConfig.h.in
index db591a8..838cc2e 100644
--- a/unix/tkConfig.h.in
+++ b/unix/tkConfig.h.in
@@ -4,6 +4,9 @@
     #ifndef _TKCONFIG
     #define _TKCONFIG
 
+/* Define to 1 if you have the <AvailabilityMacros.h> header file. */
+#undef HAVE_AVAILABILITYMACROS_H
+
 /* Do we have access to Darwin CoreFoundation.framework? */
 #undef HAVE_COREFOUNDATION
 
@@ -73,6 +76,9 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H
 
+/* Is weak import available? */
+#undef HAVE_WEAK_IMPORT
+
 /* Have we turned on XFT (antialiased fonts)? */
 #undef HAVE_XFT
 
@@ -170,6 +176,9 @@
    first (like Motorola and SPARC, unlike Intel and VAX). */
 #undef WORDS_BIGENDIAN
 
+/* Are Darwin SUSv3 extensions available? */
+#undef _DARWIN_C_SOURCE
+
 /* Add the _ISOC99_SOURCE flag when building */
 #undef _ISOC99_SOURCE