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

EXTERNALLY_VISIBLE. 5% size reduction of libbusybox.so

Makefile.flags

@@ -56,10 +56,13 @@ ifeq ($(CONFIG_DEBUG),y)
 CFLAGS += $(call cc-option,-g)
 endif
 
+ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
 # on i386: 14% smaller libbusybox.so
 # (code itself is 9% bigger, we save on relocs/PLT/GOT)
-ifeq ($(CONFIG_BUILD_LIBBUSYBOX),y)
 CFLAGS += -fpic
+# and another 4% reduction of libbusybox.so:
+# (external entry points must be marked EXTERNALLY_VISIBLE)
+CFLAGS += $(call cc-option,-fvisibility=hidden)
 endif
 
 ifeq ($(CONFIG_STATIC),y)

applets/applets.c

@@ -24,6 +24,6 @@
 #if ENABLE_BUILD_LIBBUSYBOX
 int main(int argc, char **argv)
 {
-	return libbusybox_main(argc, argv);
+	return lbb_main(argc, argv);
 }
 #endif

archival/ar.c

@@ -37,7 +37,7 @@ static void header_verbose_list_ar(const file_header_t *file_header)
 #define AR_OPT_CREATE		0x20
 #define AR_OPT_INSERT		0x40
 
-int ar_main(int argc, char **argv);
+int ar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int ar_main(int argc, char **argv)
 {
 	static const char msg_unsupported_err[] ALIGN1 =

archival/bbunzip.c

@@ -158,7 +158,7 @@ USE_DESKTOP(long long) int unpack_bunzip2(void)
 	return unpack_bz2_stream(STDIN_FILENO, STDOUT_FILENO);
 }
 
-int bunzip2_main(int argc, char **argv);
+int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int bunzip2_main(int argc, char **argv)
 {
 	getopt32(argv, "cf");
@@ -256,7 +256,7 @@ USE_DESKTOP(long long) int unpack_gunzip(void)
 	return status;
 }
 
-int gunzip_main(int argc, char **argv);
+int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int gunzip_main(int argc, char **argv)
 {
 	getopt32(argv, "cfvdt");
@@ -294,7 +294,7 @@ USE_DESKTOP(long long) int unpack_unlzma(void)
 	return unpack_lzma_stream(STDIN_FILENO, STDOUT_FILENO);
 }
 
-int unlzma_main(int argc, char **argv);
+int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int unlzma_main(int argc, char **argv)
 {
 	getopt32(argv, "cf");
@@ -336,7 +336,7 @@ USE_DESKTOP(long long) int unpack_uncompress(void)
 	return status;
 }
 
-int uncompress_main(int argc, char **argv);
+int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int uncompress_main(int argc, char **argv)
 {
 	getopt32(argv, "cf");

archival/cpio.c

@@ -22,7 +22,7 @@
 #define CPIO_OPT_CREATE_LEADING_DIR     0x20
 #define CPIO_OPT_PRESERVE_MTIME         0x40
 
-int cpio_main(int argc, char **argv);
+int cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int cpio_main(int argc, char **argv)
 {
 	archive_handle_t *archive_handle;

archival/dpkg.c

@@ -1557,7 +1557,7 @@ static void configure_package(deb_file_t *deb_file)
 	set_status(status_num, "installed", 3);
 }
 
-int dpkg_main(int argc, char **argv);
+int dpkg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int dpkg_main(int argc, char **argv)
 {
 	deb_file_t **deb_file = NULL;

archival/dpkg_deb.c

@@ -13,7 +13,7 @@
 #define DPKG_DEB_OPT_EXTRACT	8
 #define DPKG_DEB_OPT_EXTRACT_VERBOSE	16
 
-int dpkg_deb_main(int argc, char **argv);
+int dpkg_deb_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int dpkg_deb_main(int argc, char **argv)
 {
 	archive_handle_t *ar_archive;

archival/gzip.c

@@ -2025,7 +2025,7 @@ USE_DESKTOP(long long) int pack_gzip(void)
 	return 0;
 }
 
-int gzip_main(int argc, char **argv);
+int gzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int gzip_main(int argc, char **argv)
 {
 	unsigned opt;

archival/rpm.c

@@ -80,7 +80,7 @@ static void fileaction_dobackup(char *filename, int fileref);
 static void fileaction_setowngrp(char *filename, int fileref);
 static void loop_through_files(int filetag, void (*fileaction)(char *filename, int fileref));
 
-int rpm_main(int argc, char **argv);
+int rpm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int rpm_main(int argc, char **argv)
 {
 	int opt = 0, func = 0, rpm_fd, offset;

archival/rpm2cpio.c

@@ -49,7 +49,7 @@ static void skip_header(int rpm_fd)
 }
 
 /* No getopt required */
-int rpm2cpio_main(int argc, char **argv);
+int rpm2cpio_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int rpm2cpio_main(int argc, char **argv)
 {
 	struct rpm_lead lead;

archival/tar.c

@@ -769,7 +769,7 @@ static const char tar_longopts[] ALIGN1 =
 	;
 #endif
 
-int tar_main(int argc, char **argv);
+int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int tar_main(int argc, char **argv)
 {
 	char (*get_header_ptr)(archive_handle_t *) = get_header_tar;

archival/unzip.c

@@ -93,7 +93,7 @@ static int unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
 	return 0;
 }
 
-int unzip_main(int argc, char **argv);
+int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int unzip_main(int argc, char **argv)
 {
 	zip_header_t zip_header;

console-tools/chvt.c

@@ -15,7 +15,7 @@ enum {
 	VT_WAITACTIVE = 0x5607  /* wait for vt active */
 };
 
-int chvt_main(int argc, char **argv);
+int chvt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int chvt_main(int argc, char **argv)
 {
 	int fd, num;

console-tools/clear.c

@@ -12,7 +12,7 @@
 
 #include "libbb.h"
 
-int clear_main(int argc, char **argv);
+int clear_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int clear_main(int argc, char **argv)
 {
 	return printf("\033[H\033[J") != 6;

console-tools/deallocvt.c

@@ -15,7 +15,7 @@
 /* From <linux/vt.h> */
 enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */
 
-int deallocvt_main(int argc, char **argv);
+int deallocvt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int deallocvt_main(int argc, char **argv)
 {
 	/* num = 0 deallocate all unused consoles */

console-tools/dumpkmap.c

@@ -22,7 +22,7 @@ struct kbentry {
 #define NR_KEYS 128
 #define MAX_NR_KEYMAPS 256
 
-int dumpkmap_main(int argc, char **argv);
+int dumpkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int dumpkmap_main(int argc, char **argv)
 {
 	struct kbentry ke;

console-tools/loadfont.c

@@ -166,7 +166,7 @@ static void loadnewfont(int fd)
 	do_loadfont(fd, inbuf + offset, unit, 256);
 }
 
-int loadfont_main(int argc, char **argv);
+int loadfont_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int loadfont_main(int argc, char **argv)
 {
 	int fd;

console-tools/loadkmap.c

@@ -25,7 +25,7 @@ struct kbentry {
 #define NR_KEYS         128
 #define MAX_NR_KEYMAPS  256
 
-int loadkmap_main(int argc, char **argv);
+int loadkmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int loadkmap_main(int argc, char **argv)
 {
 	struct kbentry ke;

console-tools/openvt.c

@@ -12,7 +12,7 @@
 
 #include "libbb.h"
 
-int openvt_main(int argc, char **argv);
+int openvt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int openvt_main(int argc, char **argv)
 {
 	char vtname[sizeof(VC_FORMAT) + 2];

console-tools/reset.c

@@ -12,7 +12,7 @@
 
 #include "libbb.h"
 
-int reset_main(int argc, char **argv);
+int reset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int reset_main(int argc, char **argv)
 {
 	if (isatty(1)) {

console-tools/resize.c

@@ -20,7 +20,7 @@ onintr(int sig ATTRIBUTE_UNUSED)
 	exit(1);
 }
 
-int resize_main(int argc, char **argv);
+int resize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int resize_main(int argc, char **argv)
 {
 	struct termios new;

console-tools/setconsole.c

@@ -18,7 +18,7 @@ static const char setconsole_longopts[] ALIGN1 =
 
 #define OPT_SETCONS_RESET 1
 
-int setconsole_main(int argc, char **argv);
+int setconsole_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int setconsole_main(int argc, char **argv)
 {
 	unsigned long flags;

console-tools/setkeycodes.c

@@ -20,8 +20,8 @@ enum {
 	KDSETKEYCODE = 0x4B4D  /* write kernel keycode table entry */
 };
 
-int setkeycodes_main(int argc, char** argv);
-int setkeycodes_main(int argc, char** argv)
+int setkeycodes_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int setkeycodes_main(int argc, char **argv)
 {
 	int fd, sc;
 	struct kbkeycode a;

console-tools/setlogcons.c

@@ -11,7 +11,7 @@
 
 #include "libbb.h"
 
-int setlogcons_main(int argc, char **argv);
+int setlogcons_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int setlogcons_main(int argc, char **argv)
 {
 	struct {

coreutils/basename.c

@@ -24,7 +24,7 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-int basename_main(int argc, char **argv);
+int basename_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int basename_main(int argc, char **argv)
 {
 	size_t m, n;

coreutils/cal.c

@@ -75,7 +75,7 @@ static char *build_row(char *p, unsigned *dp);
 #define	J_WEEK_LEN	(WEEK_LEN + 7)
 #define	HEAD_SEP	2		/* spaces between day headings */
 
-int cal_main(int argc, char **argv);
+int cal_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int cal_main(int argc, char **argv)
 {
 	struct tm *local_time;

coreutils/cat.c

@@ -43,7 +43,7 @@ int bb_cat(char **argv)
 	return retval;
 }
 
-int cat_main(int argc, char **argv);
+int cat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int cat_main(int argc, char **argv)
 {
 	getopt32(argv, "u");

coreutils/catv.c

@@ -12,7 +12,7 @@
 
 #include "libbb.h"
 
-int catv_main(int argc, char **argv);
+int catv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int catv_main(int argc, char **argv)
 {
 	int retval = EXIT_SUCCESS;

coreutils/chgrp.c

@@ -16,7 +16,7 @@
 /* This is a NOEXEC applet. Be very careful! */
 
 
-int chgrp_main(int argc, char **argv);
+int chgrp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int chgrp_main(int argc, char **argv)
 {
 	/* "chgrp [opts] abc file(s)" == "chown [opts] :abc file(s)" */

coreutils/chmod.c

@@ -67,7 +67,7 @@ static int fileAction(const char *fileName, struct stat *statbuf, void* param, i
 	return FALSE;
 }
 
-int chmod_main(int argc, char **argv);
+int chmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int chmod_main(int argc, char **argv)
 {
 	int retval = EXIT_SUCCESS;

coreutils/chown.c

@@ -61,7 +61,7 @@ static int fileAction(const char *fileName, struct stat *statbuf,
 	return FALSE;
 }
 
-int chown_main(int argc, char **argv);
+int chown_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int chown_main(int argc, char **argv)
 {
 	int retval = EXIT_SUCCESS;

coreutils/chroot.c

@@ -11,7 +11,7 @@
 
 #include "libbb.h"
 
-int chroot_main(int argc, char **argv);
+int chroot_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int chroot_main(int argc, char **argv)
 {
 	if (argc < 2) {

coreutils/cksum.c

@@ -8,7 +8,7 @@
 
 #include "libbb.h"
 
-int cksum_main(int argc, char **argv);
+int cksum_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int cksum_main(int argc, char **argv)
 {
 	uint32_t *crc32_table = crc32_filltable(NULL, 1);

coreutils/comm.c

@@ -35,7 +35,7 @@ static void writeline(char *line, int class, int flags)
 	fputs(line, stdout);
 }
 
-int comm_main(int argc, char **argv);
+int comm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int comm_main(int argc, char **argv)
 {
 #define LINE_LEN 100

coreutils/cp.c

@@ -21,7 +21,7 @@
 /* This is a NOEXEC applet. Be very careful! */
 
 
-int cp_main(int argc, char **argv);
+int cp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int cp_main(int argc, char **argv)
 {
 	struct stat source_stat;

coreutils/cut.c

@@ -165,7 +165,7 @@ static void cut_file(FILE * file)
 
 static const char _op_on_field[] ALIGN1 = " only when operating on fields";
 
-int cut_main(int argc, char **argv);
+int cut_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int cut_main(int argc, char **argv)
 {
 	char *sopt, *ltok;

coreutils/date.c

@@ -38,7 +38,7 @@ static void maybe_set_utc(int opt)
 		putenv((char*)"TZ=UTC0");
 }
 
-int date_main(int argc, char **argv);
+int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int date_main(int argc, char **argv)
 {
 	time_t tm;

coreutils/dd.c

@@ -73,7 +73,7 @@ static bool write_and_stats(int fd, const void *buf, size_t len, size_t obs,
 #define XATOU_SFX xatoul_sfx
 #endif
 
-int dd_main(int argc, char **argv);
+int dd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int dd_main(int argc, char **argv)
 {
 	enum {

coreutils/df.c

@@ -29,7 +29,7 @@ static unsigned long kscale(unsigned long b, unsigned long bs)
 }
 #endif
 
-int df_main(int argc, char **argv);
+int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int df_main(int argc, char **argv)
 {
 	unsigned long blocks_used;

coreutils/dirname.c

@@ -14,7 +14,7 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-int dirname_main(int argc, char **argv);
+int dirname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int dirname_main(int argc, char **argv)
 {
 	if (argc != 2) {

coreutils/dos2unix.c

@@ -78,7 +78,7 @@ static int convert(char *fn, int conv_type)
 	return 0;
 }
 
-int dos2unix_main(int argc, char **argv);
+int dos2unix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int dos2unix_main(int argc, char **argv)
 {
 	int o, conv_type;

coreutils/du.c

@@ -140,7 +140,7 @@ static unsigned long du(const char *filename)
 	return sum;
 }
 
-int du_main(int argc, char **argv);
+int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int du_main(int argc, char **argv)
 {
 	unsigned long total;

coreutils/echo.c

@@ -119,8 +119,8 @@ int bb_echo(char **argv)
 
 /* This is a NOFORK applet. Be very careful! */
 
-int echo_main(int argc, char** argv);
-int echo_main(int argc, char** argv)
+int echo_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int echo_main(int argc, char **argv)
 {
 	return bb_echo(argv);
 }

coreutils/env.c

@@ -41,8 +41,8 @@ static const char env_longopts[] ALIGN1 =
 	;
 #endif
 
-int env_main(int argc, char** argv);
-int env_main(int argc, char** argv)
+int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int env_main(int argc, char **argv)
 {
 	/* cleanenv was static - why? */
 	char *cleanenv[1];

coreutils/expand.c

@@ -125,7 +125,7 @@ static void unexpand(FILE *file, unsigned int tab_size, unsigned opt)
 }
 #endif
 
-int expand_main(int argc, char **argv);
+int expand_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int expand_main(int argc, char **argv)
 {
 	/* Default 8 spaces for 1 tab */

coreutils/expr.c

@@ -483,7 +483,7 @@ static VALUE *eval(void)
 	return l;
 }
 
-int expr_main(int argc, char **argv);
+int expr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int expr_main(int argc, char **argv)
 {
 	VALUE *v;

coreutils/false.c

@@ -14,7 +14,7 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-int false_main(int ATTRIBUTE_UNUSED argc, char ATTRIBUTE_UNUSED **argv);
+int false_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int false_main(int ATTRIBUTE_UNUSED argc, char ATTRIBUTE_UNUSED **argv)
 {
 	return EXIT_FAILURE;

coreutils/fold.c

@@ -38,7 +38,7 @@ static int adjust_column(int column, char c)
 	return column;
 }
 
-int fold_main(int argc, char **argv);
+int fold_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int fold_main(int argc, char **argv)
 {
 	char *line_out = NULL;

coreutils/head.c

@@ -31,7 +31,7 @@ static const struct suffix_mult head_suffixes[] = {
 
 static const char header_fmt_str[] ALIGN1 = "\n==> %s <==\n";
 
-int head_main(int argc, char **argv);
+int head_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int head_main(int argc, char **argv)
 {
 	unsigned long count = 10;

coreutils/hostid.c

@@ -13,7 +13,7 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-int hostid_main(int argc, char ATTRIBUTE_UNUSED **argv);
+int hostid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int hostid_main(int argc, char ATTRIBUTE_UNUSED **argv)
 {
 	if (argc > 1) {

coreutils/id.c

@@ -36,7 +36,7 @@ static int printf_full(unsigned int id, const char *arg, const char prefix)
 	return status;
 }
 
-int id_main(int argc, char **argv);
+int id_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int id_main(int argc, char **argv)
 {
 	struct passwd *p;

coreutils/install.c

@@ -66,7 +66,7 @@ static void setdefaultfilecon(const char *path)
 
 #endif
 
-int install_main(int argc, char **argv);
+int install_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int install_main(int argc, char **argv)
 {
 	struct stat statbuf;

coreutils/length.c

@@ -6,7 +6,7 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-int length_main(int argc, char **argv);
+int length_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int length_main(int argc, char **argv)
 {
 	if ((argc != 2) || (**(++argv) == '-')) {

coreutils/ln.c

@@ -22,7 +22,7 @@
 #define LN_BACKUP           8
 #define LN_SUFFIX           16
 
-int ln_main(int argc, char **argv);
+int ln_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int ln_main(int argc, char **argv)
 {
 	int status = EXIT_SUCCESS;

coreutils/logname.c

@@ -24,7 +24,7 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-int logname_main(int argc, char ATTRIBUTE_UNUSED **argv);
+int logname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int logname_main(int argc, char ATTRIBUTE_UNUSED **argv)
 {
 	char buf[128];

coreutils/ls.c

@@ -783,7 +783,7 @@ static const unsigned opt_flags[] = {
 /* THIS IS A "SAFE" APPLET, main() MAY BE CALLED INTERNALLY FROM SHELL */
 /* BE CAREFUL! */
 
-int ls_main(int argc, char **argv);
+int ls_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int ls_main(int argc, char **argv)
 {
 	struct dnode **dnd;

coreutils/md5_sha1_sum.c

@@ -77,7 +77,7 @@ static uint8_t *hash_file(const char *filename, hash_algo_t hash_algo)
 	return hash_value;
 }
 
-int md5_sha1_sum_main(int argc, char **argv);
+int md5_sha1_sum_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int md5_sha1_sum_main(int argc, char **argv)
 {
 	int return_value = EXIT_SUCCESS;

coreutils/mkdir.c

@@ -34,7 +34,7 @@ static const char mkdir_longopts[] ALIGN1 =
 	;
 #endif
 
-int mkdir_main(int argc, char **argv);
+int mkdir_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int mkdir_main(int argc, char **argv)
 {
 	mode_t mode = (mode_t)(-1);

coreutils/mkfifo.c

@@ -13,7 +13,7 @@
 #include "libbb.h"
 #include "libcoreutils/coreutils.h"
 
-int mkfifo_main(int argc, char **argv);
+int mkfifo_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int mkfifo_main(int argc, char **argv)
 {
 	mode_t mode;

coreutils/mknod.c

@@ -17,7 +17,7 @@
 static const char modes_chars[] ALIGN1 = { 'p', 'c', 'u', 'b', 0, 1, 1, 2 };
 static const mode_t modes_cubp[] = { S_IFIFO, S_IFCHR, S_IFBLK };
 
-int mknod_main(int argc, char **argv);
+int mknod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int mknod_main(int argc, char **argv)
 {
 	mode_t mode;

coreutils/mv.c

@@ -33,7 +33,7 @@ static const char mv_longopts[] ALIGN1 =
 static const char fmt[] ALIGN1 =
 	"cannot overwrite %sdirectory with %sdirectory";
 
-int mv_main(int argc, char **argv);
+int mv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int mv_main(int argc, char **argv)
 {
 	struct stat dest_stat;

coreutils/nice.c

@@ -10,7 +10,7 @@
 #include <sys/resource.h>
 #include "libbb.h"
 
-int nice_main(int argc, char **argv);
+int nice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int nice_main(int argc, char **argv)
 {
 	int old_priority, adjustment;

coreutils/nohup.c

@@ -12,7 +12,7 @@
 
 #include "libbb.h"
 
-int nohup_main(int argc, char **argv);
+int nohup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int nohup_main(int argc, char **argv)
 {
 	int nullfd;

coreutils/od.c

@@ -156,7 +156,7 @@ static const char od_o2si[] ALIGN1 = {
 	0xb, 1, 8, 9,
 };
 
-int od_main(int argc, char **argv);
+int od_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int od_main(int argc, char **argv)
 {
 	int ch;

coreutils/od_bloaty.c

@@ -1196,7 +1196,7 @@ dump_strings(void)
 	check_and_close();
 }
 
-int od_main(int argc, char **argv);
+int od_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int od_main(int argc, char **argv)
 {
 	static const struct suffix_mult bkm[] = {

coreutils/printenv.c

@@ -11,7 +11,7 @@
 #include "libbb.h"
 extern char **environ;
 
-int printenv_main(int argc, char **argv);
+int printenv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int printenv_main(int argc, char **argv)
 {
 	/* no variables specified, show whole env */

coreutils/printf.c

@@ -285,7 +285,7 @@ static int print_formatted(char *format, int argc, char **argv)
 	return save_argc - argc;
 }
 
-int printf_main(int argc, char **argv);
+int printf_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int printf_main(int argc, char **argv)
 {
 	char *format;

coreutils/pwd.c

@@ -11,7 +11,7 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-int pwd_main(int argc, char **argv);
+int pwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int pwd_main(int argc, char **argv)
 {
 	char *buf;

coreutils/readlink.c

@@ -11,7 +11,7 @@
 
 #include "libbb.h"
 
-int readlink_main(int argc, char **argv);
+int readlink_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int readlink_main(int argc, char **argv)
 {
 	char *buf;

coreutils/realpath.c

@@ -12,7 +12,7 @@
 
 #include "libbb.h"
 
-int realpath_main(int argc, char **argv);
+int realpath_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int realpath_main(int argc, char **argv)
 {
 	int retval = EXIT_SUCCESS;

coreutils/rm.c

@@ -19,7 +19,7 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-int rm_main(int argc, char **argv);
+int rm_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int rm_main(int argc, char **argv)
 {
 	int status = 0;

coreutils/rmdir.c

@@ -16,7 +16,7 @@
 /* This is a NOFORK applet. Be very careful! */
 
 
-int rmdir_main(int argc, char **argv);
+int rmdir_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int rmdir_main(int argc, char **argv)
 {
 	int status = EXIT_SUCCESS;

coreutils/seq.c

@@ -12,7 +12,7 @@
 /* This is a NOFORK applet. Be very careful! */
 
 
-int seq_main(int argc, char **argv);
+int seq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int seq_main(int argc, char **argv)
 {
 	double last, increment, i;

coreutils/sleep.c

@@ -33,7 +33,7 @@ static const struct suffix_mult sfx[] = {
 };
 #endif
 
-int sleep_main(int argc, char **argv);
+int sleep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int sleep_main(int argc, char **argv)
 {
 	unsigned duration;

coreutils/sort.c

@@ -274,7 +274,7 @@ static unsigned str2u(char **str)
 }
 #endif
 
-int sort_main(int argc, char **argv);
+int sort_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int sort_main(int argc, char **argv)
 {
 	FILE *fp, *outfile = stdout;

coreutils/split.c

@@ -55,7 +55,7 @@ enum { READ_BUFFER_SIZE = COMMON_BUFSIZE - 1 };
 #define SPLIT_OPT_b (1<<1)
 #define SPLIT_OPT_a (1<<2)
 
-int split_main(int argc, char **argv);
+int split_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int split_main(int argc, char **argv)
 {
 	unsigned suffix_len = 2;

coreutils/stat.c

@@ -609,7 +609,7 @@ static bool do_stat(const char *filename, const char *format)
 	return 1;
 }
 
-int stat_main(int argc, char **argv);
+int stat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int stat_main(int argc, char **argv)
 {
 	char *format = NULL;

coreutils/stty.c

@@ -911,7 +911,7 @@ static void set_control_char_or_die(const struct control_info *info,
 #define STTY_verbose_output     (1<<2)
 #define STTY_recoverable_output (1<<3)
 #define STTY_noargs             (1<<4)
-int stty_main(int argc, char **argv);
+int stty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int stty_main(int argc, char **argv)
 {
 	struct termios mode;

coreutils/sum.c

@@ -74,7 +74,7 @@ static unsigned sum_file(const char *file, const unsigned type)
 #undef buf
 }
 
-int sum_main(int argc, char **argv);
+int sum_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int sum_main(int argc, char **argv)
 {
 	unsigned n;

coreutils/sync.c

@@ -13,7 +13,7 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-int sync_main(int argc, char **argv);
+int sync_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int sync_main(int argc, char **argv)
 {
 	bb_warn_ignoring_args(argc - 1);

coreutils/tail.c

@@ -79,7 +79,7 @@ static unsigned eat_num(const char *p)
 	return xatou_sfx(p, tail_suffixes);
 }
 
-int tail_main(int argc, char **argv);
+int tail_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int tail_main(int argc, char **argv)
 {
 	unsigned count = 10;

coreutils/tee.c

@@ -13,7 +13,7 @@
 #include "libbb.h"
 #include <signal.h>
 
-int tee_main(int argc, char **argv);
+int tee_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int tee_main(int argc, char **argv)
 {
 	const char *mode = "w\0a";

coreutils/touch.c

@@ -21,7 +21,7 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-int touch_main(int argc, char **argv);
+int touch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int touch_main(int argc, char **argv)
 {
 	int fd;

coreutils/tr.c

@@ -165,7 +165,7 @@ static int complement(char *buffer, int buffer_len)
 	return ix;
 }
 
-int tr_main(int argc, char **argv);
+int tr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int tr_main(int argc, char **argv)
 {
 	unsigned char *ptr;

coreutils/true.c

@@ -14,7 +14,7 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-int true_main(int argc, char **argv);
+int true_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int true_main(int argc, char **argv)
 {
 	return EXIT_SUCCESS;

coreutils/tty.c

@@ -12,7 +12,7 @@
 
 #include "libbb.h"
 
-int tty_main(int argc, char **argv);
+int tty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int tty_main(int argc, char **argv)
 {
 	const char *s;

coreutils/uname.c

@@ -48,7 +48,7 @@ static const unsigned short utsname_offset[] ALIGN2 = {
 	offsetof(uname_info_t,processor)
 };
 
-int uname_main(int argc, char **argv);
+int uname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int uname_main(int argc, char **argv)
 {
 	uname_info_t uname_info;

coreutils/uniq.c

@@ -27,7 +27,7 @@ static FILE *xgetoptfile_uniq_s(char **argv, int read0write2)
 	return (read0write2) ? stdout : stdin;
 }
 
-int uniq_main(int argc, char **argv);
+int uniq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int uniq_main(int argc, char **argv)
 {
 	FILE *in, *out;

coreutils/usleep.c

@@ -13,7 +13,7 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-int usleep_main(int argc, char **argv);
+int usleep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int usleep_main(int argc, char **argv)
 {
 	if (argc != 2) {

coreutils/uudecode.c

@@ -126,7 +126,7 @@ static void read_base64(FILE *src_stream, FILE *dst_stream)
 	}
 }
 
-int uudecode_main(int argc, char **argv);
+int uudecode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int uudecode_main(int argc, char **argv)
 {
 	FILE *src_stream = stdin;

coreutils/uuencode.c

@@ -15,7 +15,7 @@ enum {
 	DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3),
 };
 
-int uuencode_main(int argc, char **argv);
+int uuencode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int uuencode_main(int argc, char **argv)
 {
 	struct stat stat_buf;

coreutils/wc.c

@@ -68,7 +68,7 @@ enum {
 	WC_LENGTH	= 3
 };
 
-int wc_main(int argc, char **argv);
+int wc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int wc_main(int argc, char **argv)
 {
 	FILE *fp;

coreutils/who.c

@@ -39,7 +39,7 @@ static void idle_string(char *str6, time_t t)
 	strcpy(str6, "old");
 }
 
-int who_main(int argc, char **argv);
+int who_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int who_main(int argc, char **argv)
 {
 	char str6[6];

coreutils/whoami.c

@@ -13,7 +13,7 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-int whoami_main(int argc, char **argv);
+int whoami_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int whoami_main(int argc, char **argv)
 {
 	if (argc > 1)

coreutils/yes.c

@@ -18,7 +18,7 @@
 
 /* This is a NOFORK applet. Be very careful! */
 
-int yes_main(int argc, char **argv);
+int yes_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int yes_main(int argc, char **argv)
 {
 	char **first_arg;

debianutils/mktemp.c

@@ -11,7 +11,7 @@
 
 #include "libbb.h"
 
-int mktemp_main(int argc, char **argv);
+int mktemp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int mktemp_main(int argc, char **argv)
 {
 	unsigned long flags = getopt32(argv, "dqt");

debianutils/pipe_progress.c

@@ -14,7 +14,7 @@
 /* Read a block of data from stdin, write it to stdout.
  * Activity is indicated by a '.' to stderr
  */
-int pipe_progress_main(int argc, char **argv);
+int pipe_progress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int pipe_progress_main(int argc, char **argv)
 {
 	RESERVE_CONFIG_BUFFER(buf, PIPE_PROGRESS_SIZE);

debianutils/run_parts.c

@@ -110,7 +110,7 @@ static const char runparts_longopts[] ALIGN1 =
 	;
 #endif
 
-int run_parts_main(int argc, char **argv);
+int run_parts_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int run_parts_main(int argc, char **argv)
 {
 	const char *umask_p = "22";

debianutils/start_stop_daemon.c

@@ -234,7 +234,7 @@ enum {
 	OPT_NICELEVEL  = 0x4000 * ENABLE_FEATURE_START_STOP_DAEMON_FANCY, // -N
 };
 
-int start_stop_daemon_main(int argc, char **argv);
+int start_stop_daemon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int start_stop_daemon_main(int argc, char **argv)
 {
 	unsigned opt;

debianutils/which.c

@@ -12,7 +12,7 @@
 
 #include "libbb.h"
 
-int which_main(int argc, char **argv);
+int which_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int which_main(int argc, char **argv)
 {
 	int status = EXIT_SUCCESS;