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-rw-r--r--unix/tcl.m42
1 files changed, 1 insertions, 1 deletions
diff --git a/unix/tcl.m4 b/unix/tcl.m4
index c5045c7..d6769af 100644
--- a/unix/tcl.m4
+++ b/unix/tcl.m4
@@ -1052,7 +1052,7 @@ 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"
+ 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])