add -fvisibility=hidden to CC flags, mark XXX_main functions

EXTERNALLY_VISIBLE. 5% size reduction of libbusybox.so

4 files changed, 34 insertions, 14 deletions

diff --git a/include/applets.h b/include/applets.h
index ac3f65f6d..ceab00334 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -24,11 +24,11 @@ s     - suid type:
 */
 
 #if defined(PROTOTYPES)
-# define APPLET(name,l,s)                    int name##_main(int argc, char **argv);
-# define APPLET_NOUSAGE(name,main,l,s)       int main##_main(int argc, char **argv);
-# define APPLET_ODDNAME(name,main,l,s,name2) int main##_main(int argc, char **argv);
-# define APPLET_NOEXEC(name,main,l,s,name2)  int main##_main(int argc, char **argv);
-# define APPLET_NOFORK(name,main,l,s,name2)  int main##_main(int argc, char **argv);
+# define APPLET(name,l,s)                    int name##_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+# define APPLET_NOUSAGE(name,main,l,s)       int main##_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+# define APPLET_ODDNAME(name,main,l,s,name2) int main##_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+# define APPLET_NOEXEC(name,main,l,s,name2)  int main##_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+# define APPLET_NOFORK(name,main,l,s,name2)  int main##_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 
 #elif defined(NAME_MAIN_CNAME)
 # define APPLET(name,l,s)                    name name##_main name
diff --git a/include/busybox.h b/include/busybox.h
index 1c23b9bb0..5c01eca8d 100644
--- a/include/busybox.h
+++ b/include/busybox.h
@@ -48,12 +48,22 @@ struct bb_applet {
 #endif
 };
 
+
 /* Defined in appletlib.c */
 extern const struct bb_applet applets[];
 extern const unsigned short NUM_APPLETS;
-void bbox_prepare_main(char **argv);
+
+/* Length of these names has effect on size of libbusybox
+ * and "individual" binaries. Keep them short.
+ */
+void lbb_prepare(char **argv) MAIN_EXTERNALLY_VISIBLE;
 #if ENABLE_BUILD_LIBBUSYBOX
-int libbusybox_main(int argc, char **argv);
+#if ENABLE_FEATURE_SHARED_BUSYBOX
+int lbb_main(int argc, char **argv) EXTERNALLY_VISIBLE;
+#else
+int lbb_main(int argc, char **argv);
 #endif
+#endif
+
 
 #endif	/* _BB_INTERNAL_H_ */
diff --git a/include/libbb.h b/include/libbb.h
index 9d8b5f3df..be548a306 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -673,7 +673,7 @@ extern int die_sleep;
 extern int xfunc_error_retval;
 extern jmp_buf die_jmp;
 extern void xfunc_die(void) ATTRIBUTE_NORETURN;
-extern void bb_show_usage(void) ATTRIBUTE_NORETURN ATTRIBUTE_EXTERNALLY_VISIBLE;
+extern void bb_show_usage(void) ATTRIBUTE_NORETURN;
 extern void bb_error_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2)));
 extern void bb_error_msg_and_die(const char *s, ...) __attribute__ ((noreturn, format (printf, 1, 2)));
 extern void bb_perror_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2)));
@@ -687,18 +687,27 @@ extern void bb_perror_nomsg(void);
 extern void bb_info_msg(const char *s, ...) __attribute__ ((format (printf, 1, 2)));
 extern void bb_verror_msg(const char *s, va_list p, const char *strerr);
 
+/* We need to export XXX_main from libbusybox
+ * only if we build "individual" binaries
+ */
+#if ENABLE_FEATURE_INDIVIDUAL
+#define MAIN_EXTERNALLY_VISIBLE EXTERNALLY_VISIBLE
+#else
+#define MAIN_EXTERNALLY_VISIBLE
+#endif
+
 
 /* applets which are useful from another applets */
 int bb_cat(char** argv);
 int bb_echo(char** argv);
-int test_main(int argc, char** argv);
-int kill_main(int argc, char **argv);
+int test_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int kill_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 #if ENABLE_ROUTE
 void bb_displayroutes(int noresolve, int netstatfmt);
 #endif
-int chown_main(int argc, char **argv);
+int chown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 #if ENABLE_GUNZIP
-int gunzip_main(int argc, char **argv);
+int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 #endif
 int bbunpack(char **argv,
 	char* (*make_new_name)(char *filename),
diff --git a/include/platform.h b/include/platform.h
index 39809450e..53d72829f 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -71,9 +71,10 @@
 /* -fwhole-program makes all symbols local. The attribute externally_visible
    forces a symbol global.  */
 # if __GNUC_PREREQ (4,1)
-#  define ATTRIBUTE_EXTERNALLY_VISIBLE __attribute__ ((__externally_visible__))
+#  define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ));
+//__attribute__ ((__externally_visible__))
 # else
-#  define ATTRIBUTE_EXTERNALLY_VISIBLE
+#  define EXTERNALLY_VISIBLE
 # endif /* GNUC >= 4.1 */
 
 /* We use __extension__ in some places to suppress -pedantic warnings