add -fvisibility=hidden to CC flags, mark XXX_main functions
EXTERNALLY_VISIBLE. 5% size reduction of libbusybox.so
diff --git a/util-linux/umount.c b/util-linux/umount.c
index c57a49e..17d88b3 100644
--- a/util-linux/umount.c
+++ b/util-linux/umount.c
@@ -21,7 +21,7 @@
#define OPT_REMOUNT (1 << 4)
#define OPT_ALL (ENABLE_FEATURE_UMOUNT_ALL ? (1 << 5) : 0)
-int umount_main(int argc, char **argv);
+int umount_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int umount_main(int argc, char **argv)
{
int doForce;