From 1800bb7cff79bda28c05c8702f44b3fe5d069716 Mon Sep 17 00:00:00 2001
From: nijtmans <nijtmans>
Date: Mon, 29 Mar 2010 22:31:53 +0000
Subject: Only test for -visibility=hidden with gcc (Second remark in [Bug
 2976508])

---
 ChangeLog      |  6 ++++++
 unix/configure | 17 +++++++++++++----
 unix/tcl.m4    | 13 +++++++++----
 3 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index e419e2d..4cd68e5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2010-03-29  Jan Nijtmans  <nijtmans@users.sf.net>
+
+	* unix/tcl.m4             Only test for -visibility=hidden with gcc
+	                          (Second remark in [Bug 2976508])
+	* unix/configure          regen
+
 2010-03-29  Don Porter  <dgp@users.sourceforge.net>
 
 	* generic/tclStringObj.c:       Fix array overrun in test format-1.12
diff --git a/unix/configure b/unix/configure
index d0fcd74..0396443 100755
--- a/unix/configure
+++ b/unix/configure
@@ -6434,8 +6434,10 @@ if test "${tcl_cv_cc_visibility_hidden+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
 
-	hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -fvisibility=hidden -Werror"
-	cat >conftest.$ac_ext <<_ACEOF
+	    if test "$GCC" = yes; then
+
+		hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -fvisibility=hidden -Werror"
+		cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
 _ACEOF
 cat confdefs.h >>conftest.$ac_ext
@@ -6480,7 +6482,15 @@ sed 's/^/| /' conftest.$ac_ext >&5
 tcl_cv_cc_visibility_hidden=no
 fi
 rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
-	CFLAGS=$hold_cflags
+		CFLAGS=$hold_cflags
+
+else
+
+		tcl_cv_cc_visibility_hidden=no
+
+fi
+
+
 fi
 echo "$as_me:$LINENO: result: $tcl_cv_cc_visibility_hidden" >&5
 echo "${ECHO_T}$tcl_cv_cc_visibility_hidden" >&6
@@ -6490,7 +6500,6 @@ echo "${ECHO_T}$tcl_cv_cc_visibility_hidden" >&6
 
 else
 
-
 	hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -Werror"
 	cat >conftest.$ac_ext <<_ACEOF
 /* confdefs.h.  */
diff --git a/unix/tcl.m4 b/unix/tcl.m4
index d6769af..06b6ae6 100644
--- a/unix/tcl.m4
+++ b/unix/tcl.m4
@@ -1052,10 +1052,15 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 
     AC_CACHE_CHECK([if compiler supports visibility "hidden"],
 	tcl_cv_cc_visibility_hidden, [
-	hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -fvisibility=hidden -Werror"
-	AC_TRY_COMPILE(,, tcl_cv_cc_visibility_hidden=yes,
-	    tcl_cv_cc_visibility_hidden=no)
-	CFLAGS=$hold_cflags])
+	    AS_IF([test "$GCC" = yes], [
+		hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -fvisibility=hidden -Werror"
+		AC_TRY_COMPILE(,, tcl_cv_cc_visibility_hidden=yes,
+		    tcl_cv_cc_visibility_hidden=no)
+		CFLAGS=$hold_cflags
+	    ], [
+		tcl_cv_cc_visibility_hidden=no
+	    ])
+    ])
     AS_IF([test $tcl_cv_cc_visibility_hidden = yes], [
 	CFLAGS="$CFLAGS -fvisibility=hidden"
     ], [
-- 
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