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

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EXTERNALLY_VISIBLE. 5% size reduction of libbusybox.so
This commit is contained in:
Denis Vlasenko
2007-10-11 10:05:36 +00:00
parent 8d82cf72c9
commit 9b49a5ed85
260 changed files with 325 additions and 307 deletions
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10
include/applets.h
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@@ -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

14
include/busybox.h
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@@ -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_ */

19
include/libbb.h
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@@ -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),

5
include/platform.h
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@@ -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