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-rw-r--r--unix/tcl.m41
1 files changed, 1 insertions, 0 deletions
diff --git a/unix/tcl.m4 b/unix/tcl.m4
index cfaffe8..c699535 100644
--- a/unix/tcl.m4
+++ b/unix/tcl.m4
@@ -1056,6 +1056,7 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
AS_IF([test $tcl_cv_cc_visibility_hidden = yes], [
CFLAGS="$CFLAGS -fvisibility=hidden"
], [
+ AC_DEFINE(NO_VIZ, [], [No visibility attribute])
hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -Werror"
AC_TRY_LINK([
extern __attribute__((__visibility__("hidden"))) void f(void);