Use -fvisibility=hidden to avoid exporting non-public symbols

configure.ac

@@ -81,9 +81,14 @@ if test "x$win32" != "xtrue"; then
   AC_CHECK_LIB(pthread, [pthread_create, pthread_mutex_lock], [AC_SUBST(libpthread_LIBS,[-lpthread])], [AC_MSG_ERROR([libpthread is required to build libusbmuxd])])
 fi
 
-AS_COMPILER_FLAGS(GLOBAL_CFLAGS, "-Wall -Wextra -Wmissing-declarations -Wredundant-decls -Wshadow -Wpointer-arith  -Wwrite-strings -Wswitch-default -Wno-unused-parameter")
+AS_COMPILER_FLAGS(GLOBAL_CFLAGS, "-Wall -Wextra -Wmissing-declarations -Wredundant-decls -Wshadow -Wpointer-arith  -Wwrite-strings -Wswitch-default -Wno-unused-parameter -fvisibility=hidden")
 AC_SUBST(GLOBAL_CFLAGS)
 
+case "$GLOBAL_CFLAGS" in
+    *-fvisibility=hidden*)
+        AC_DEFINE([HAVE_FVISIBILITY], [1], [Define if compiled with -fvisibility=hidden])
+esac
+
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
 
 AC_OUTPUT([

src/libusbmuxd.c

@@ -30,6 +30,12 @@
 #include <config.h>
 #endif
 
+#ifdef HAVE_FVISIBILITY
+#define USBMUXD_API __attribute__((visibility("default")))
+#else
+#define USBMUXD_API
+#endif
+
 #ifdef WIN32
 #include <windows.h>
 #include <winsock2.h>
@@ -738,7 +744,7 @@ static void *device_monitor(void *data)
 	return NULL;
 }
 
-int usbmuxd_subscribe(usbmuxd_event_cb_t callback, void *user_data)
+USBMUXD_API int usbmuxd_subscribe(usbmuxd_event_cb_t callback, void *user_data)
 {
 	int res;
 
@@ -763,7 +769,7 @@ int usbmuxd_subscribe(usbmuxd_event_cb_t callback, void *user_data)
 	return 0;
 }
 
-int usbmuxd_unsubscribe()
+USBMUXD_API int usbmuxd_unsubscribe()
 {
 	event_cb = NULL;
 
@@ -806,7 +812,7 @@ static usbmuxd_device_info_t *device_info_from_device_record(struct usbmuxd_devi
 	return devinfo;
 }
 
-int usbmuxd_get_device_list(usbmuxd_device_info_t **device_list)
+USBMUXD_API int usbmuxd_get_device_list(usbmuxd_device_info_t **device_list)
 {
 	int sfd;
 	int tag;
@@ -959,15 +965,15 @@ int usbmuxd_get_device_list(usbmuxd_device_info_t **device_list)
 	return dev_cnt;
 }
 
-int usbmuxd_device_list_free(usbmuxd_device_info_t **device_list)
+USBMUXD_API int usbmuxd_device_list_free(usbmuxd_device_info_t **device_list)
 {
 	if (device_list) {
 		free(*device_list);
 	}
 	return 0;
 }
 
-int usbmuxd_get_device_by_udid(const char *udid, usbmuxd_device_info_t *device)
+USBMUXD_API int usbmuxd_get_device_by_udid(const char *udid, usbmuxd_device_info_t *device)
 {
 	usbmuxd_device_info_t *dev_list = NULL;
 
@@ -1002,7 +1008,7 @@ int usbmuxd_get_device_by_udid(const char *udid, usbmuxd_device_info_t *device)
 	return result;
 }
 
-int usbmuxd_connect(const int handle, const unsigned short port)
+USBMUXD_API int usbmuxd_connect(const int handle, const unsigned short port)
 {
 	int sfd;
 	int tag;
@@ -1047,12 +1053,12 @@ int usbmuxd_connect(const int handle, const unsigned short port)
 	return -1;
 }
 
-int usbmuxd_disconnect(int sfd)
+USBMUXD_API int usbmuxd_disconnect(int sfd)
 {
 	return socket_close(sfd);
 }
 
-int usbmuxd_send(int sfd, const char *data, uint32_t len, uint32_t *sent_bytes)
+USBMUXD_API int usbmuxd_send(int sfd, const char *data, uint32_t len, uint32_t *sent_bytes)
 {
 	int num_sent;
 
@@ -1075,7 +1081,7 @@ int usbmuxd_send(int sfd, const char *data, uint32_t len, uint32_t *sent_bytes)
 	return 0;
 }
 
-int usbmuxd_recv_timeout(int sfd, char *data, uint32_t len, uint32_t *recv_bytes, unsigned int timeout)
+USBMUXD_API int usbmuxd_recv_timeout(int sfd, char *data, uint32_t len, uint32_t *recv_bytes, unsigned int timeout)
 {
 	int num_recv = socket_receive_timeout(sfd, (void*)data, len, 0, timeout);
 	if (num_recv < 0) {
@@ -1088,12 +1094,12 @@ int usbmuxd_recv_timeout(int sfd, char *data, uint32_t len, uint32_t *recv_bytes
 	return 0;
 }
 
-int usbmuxd_recv(int sfd, char *data, uint32_t len, uint32_t *recv_bytes)
+USBMUXD_API int usbmuxd_recv(int sfd, char *data, uint32_t len, uint32_t *recv_bytes)
 {
 	return usbmuxd_recv_timeout(sfd, data, len, recv_bytes, 5000);
 }
 
-int usbmuxd_read_buid(char **buid)
+USBMUXD_API int usbmuxd_read_buid(char **buid)
 {
 	int sfd;
 	int tag;
@@ -1134,7 +1140,7 @@ int usbmuxd_read_buid(char **buid)
 	return ret;
 }
 
-int usbmuxd_read_pair_record(const char* record_id, char **record_data, uint32_t *record_size)
+USBMUXD_API int usbmuxd_read_pair_record(const char* record_id, char **record_data, uint32_t *record_size)
 {
 	int sfd;
 	int tag;
@@ -1182,7 +1188,7 @@ int usbmuxd_read_pair_record(const char* record_id, char **record_data, uint32_t
 	return ret;
 }
 
-int usbmuxd_save_pair_record(const char* record_id, const char *record_data, uint32_t record_size)
+USBMUXD_API int usbmuxd_save_pair_record(const char* record_id, const char *record_data, uint32_t record_size)
 {
 	int sfd;
 	int tag;
@@ -1221,7 +1227,7 @@ int usbmuxd_save_pair_record(const char* record_id, const char *record_data, uin
 	return ret;
 }
 
-int usbmuxd_delete_pair_record(const char* record_id)
+USBMUXD_API int usbmuxd_delete_pair_record(const char* record_id)
 {
 	int sfd;
 	int tag;
@@ -1258,15 +1264,15 @@ int usbmuxd_delete_pair_record(const char* record_id)
 	return ret;
 }
 
-void libusbmuxd_set_use_inotify(int set)
+USBMUXD_API void libusbmuxd_set_use_inotify(int set)
 {
 #ifdef HAVE_INOTIFY
 	use_inotify = set;
 #endif
 	return;
 }
 
-void libusbmuxd_set_debug_level(int level)
+USBMUXD_API void libusbmuxd_set_debug_level(int level)
 {
 	libusbmuxd_debug = level;
 	socket_set_verbose(level);