* unix/tcl.m4: use gcc4's __attribute__((__visibility__("hidden"))) if

	available to define MODULE_SCOPE effective on all platforms.
	* unix/configure.in: add caching to -pipe check.
	* unix/configure: autoconf-2.59
	* unix/tkConfig.h.in: autoheader-2.59

1 files changed, 92 insertions, 13 deletions

diff --git a/unix/configure b/unix/configure
index f062a2d..d9d80cc 100755
--- a/unix/configure
+++ b/unix/configure
@@ -3469,13 +3469,15 @@ fi
 # It makes compiling go faster.  (This is only a performance feature.)
 #------------------------------------------------------------------------
 
-if test -z "$no_pipe"; then
-if test -n "$GCC"; then
-  echo "$as_me:$LINENO: checking if the compiler understands -pipe" >&5
+if test -z "$no_pipe" && test -n "$GCC"; then
+    echo "$as_me:$LINENO: checking if the compiler understands -pipe" >&5
 echo $ECHO_N "checking if the compiler understands -pipe... $ECHO_C" >&6
-  OLDCC="$CC"
-  CC="$CC -pipe"
-  cat >conftest.$ac_ext <<_ACEOF
+if test "${tcl_cv_cc_pipe+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+
+	hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -pipe"
+	cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
 _ACEOF
 cat confdefs.h >>conftest.$ac_ext
@@ -3512,18 +3514,21 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   ac_status=$?
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); }; }; then
-  echo "$as_me:$LINENO: result: yes" >&5
-echo "${ECHO_T}yes" >&6
+  tcl_cv_cc_pipe=yes
 else
   echo "$as_me: failed program was:" >&5
 sed 's/^/| /' conftest.$ac_ext >&5
 
-CC="$OLDCC"
-    echo "$as_me:$LINENO: result: no" >&5
-echo "${ECHO_T}no" >&6
+tcl_cv_cc_pipe=no
 fi
 rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+	CFLAGS=$hold_cflags
 fi
+echo "$as_me:$LINENO: result: $tcl_cv_cc_pipe" >&5
+echo "${ECHO_T}$tcl_cv_cc_pipe" >&6
+    if test $tcl_cv_cc_pipe = yes; then
+	CFLAGS="$CFLAGS -pipe"
+    fi
 fi
 
 #------------------------------------------------------------------------
@@ -4619,6 +4624,78 @@ echo "${ECHO_T}$do64bitVIS" >&6
 	do64bit=yes
     fi
 
+    # Step 0.c: Check if gcc visibility support is available. Do this here so
+    # that platform specific alternatives can be used below if this fails.
+
+    if test "$GCC" = "yes" ; then
+	echo "$as_me:$LINENO: checking if gcc supports visibility \"hidden\"" >&5
+echo $ECHO_N "checking if gcc supports visibility \"hidden\"... $ECHO_C" >&6
+if test "${tcl_cv_cc_visibility_hidden+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.  */
+
+		extern __attribute__((__visibility__("hidden"))) void f(void);
+		void f(void) {}
+int
+main ()
+{
+f();
+  ;
+  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 $ac_status); }; }; then
+  tcl_cv_cc_visibility_hidden=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+tcl_cv_cc_visibility_hidden=no
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+	    CFLAGS=$hold_cflags
+fi
+echo "$as_me:$LINENO: result: $tcl_cv_cc_visibility_hidden" >&5
+echo "${ECHO_T}$tcl_cv_cc_visibility_hidden" >&6
+	if test $tcl_cv_cc_visibility_hidden = yes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define MODULE_SCOPE extern __attribute__((__visibility__("hidden")))
+_ACEOF
+
+	fi
+    fi
+
     # Step 1: set the variable "system" to hold the name and version number
     # for the system.
 
@@ -6081,14 +6158,16 @@ _ACEOF
 		    fi
 		fi
 	    fi
+	    if test "$tcl_cv_cc_visibility_hidden" != yes; then
 
 cat >>confdefs.h <<\_ACEOF
-#define MAC_OSX_TCL 1
+#define MODULE_SCOPE __private_extern__
 _ACEOF
 
+	    fi
 
 cat >>confdefs.h <<\_ACEOF
-#define MODULE_SCOPE __private_extern__
+#define MAC_OSX_TCL 1
 _ACEOF
 
 	    ;;