Don't omit the -4/-6 options if no IPv6 support was compiled into

rsync.  Just make them a no-op.

options.c

@@ -122,10 +122,15 @@ long block_size = 0; /* "long" because popt can't set an int32. */
 char *skip_compress = NULL;
 
 /** Network address family. **/
+int default_af_hint
 #ifdef INET6
-int default_af_hint = 0;	/* Any protocol */
+	= 0;		/* Any protocol */
 #else
-int default_af_hint = AF_INET;	/* Must use IPv4 */
+	= AF_INET;	/* Must use IPv4 */
+# ifdef AF_INET6
+#  undef AF_INET6
+# endif
+# define AF_INET6 AF_INET /* make -6 option a no-op */
 #endif
 
 /** Do not go into the background when run as --daemon.  Good
@@ -414,10 +419,8 @@ void usage(enum logcode F)
 #ifdef ICONV_OPTION
   rprintf(F,"     --iconv=CONVERT_SPEC    request charset conversion of filesnames\n");
 #endif
-#ifdef INET6
   rprintf(F," -4, --ipv4                  prefer IPv4\n");
   rprintf(F," -6, --ipv6                  prefer IPv6\n");
-#endif
   rprintf(F,"     --version               print version number\n");
   rprintf(F,"(-h) --help                  show this help (-h works with no other options)\n");
 
@@ -593,10 +596,8 @@ static struct poptOption long_options[] = {
 #ifdef ICONV_OPTION
   {"iconv",            0,  POPT_ARG_STRING, &iconv_opt, 0, 0, 0 },
 #endif
-#ifdef INET6
   {"ipv4",            '4', POPT_ARG_VAL,    &default_af_hint, AF_INET, 0, 0 },
   {"ipv6",            '6', POPT_ARG_VAL,    &default_af_hint, AF_INET6, 0, 0 },
-#endif
   {"8-bit-output",    '8', POPT_ARG_NONE,   &allow_8bit_chars, 0, 0, 0 },
   {"qsort",            0,  POPT_ARG_NONE,   &use_qsort, 0, 0, 0 },
   {"address",          0,  POPT_ARG_STRING, &bind_address, 0, 0, 0 },
@@ -632,10 +633,8 @@ static void daemon_usage(enum logcode F)
   rprintf(F,"     --log-file-format=FMT   override the \"log format\" setting\n");
   rprintf(F,"     --sockopts=OPTIONS      specify custom TCP options\n");
   rprintf(F," -v, --verbose               increase verbosity\n");
-#ifdef INET6
   rprintf(F," -4, --ipv4                  prefer IPv4\n");
   rprintf(F," -6, --ipv6                  prefer IPv6\n");
-#endif
   rprintf(F,"     --help                  show this help screen\n");
 
   rprintf(F,"\n");
@@ -649,10 +648,8 @@ static struct poptOption long_daemon_options[] = {
   {"bwlimit",          0,  POPT_ARG_INT,    &daemon_bwlimit, 0, 0, 0 },
   {"config",           0,  POPT_ARG_STRING, &config_file, 0, 0, 0 },
   {"daemon",           0,  POPT_ARG_NONE,   &daemon_opt, 0, 0, 0 },
-#ifdef INET6
   {"ipv4",            '4', POPT_ARG_VAL,    &default_af_hint, AF_INET, 0, 0 },
   {"ipv6",            '6', POPT_ARG_VAL,    &default_af_hint, AF_INET6, 0, 0 },
-#endif
   {"detach",           0,  POPT_ARG_VAL,    &no_detach, 0, 0, 0 },
   {"no-detach",        0,  POPT_ARG_VAL,    &no_detach, 1, 0, 0 },
   {"log-file",         0,  POPT_ARG_STRING, &logfile_name, 0, 0, 0 },

rsync.yo

@@ -1949,6 +1949,10 @@ when creating sockets.  This only affects sockets that rsync has direct
 control over, such as the outgoing socket when directly contacting an
 rsync daemon.  See also these options in the bf(--daemon) mode section.
 
+If rsync was complied without support for IPv6, the bf(--ipv6) option
+will have no effect.  The bf(--version) output will tell you if this
+is the case.
+
 dit(bf(--checksum-seed=NUM)) Set the MD4 checksum seed to the integer
 NUM.  This 4 byte checksum seed is included in each block and file
 MD4 checksum calculation.  By default the checksum seed is generated
@@ -2031,6 +2035,10 @@ versions of Linux to work around an IPv6 bug in the kernel (if you see
 an "address already in use" error when nothing else is using the port,
 try specifying bf(--ipv6) or bf(--ipv4) when starting the daemon).
 
+If rsync was complied without support for IPv6, the bf(--ipv6) option
+will have no effect.  The bf(--version) output will tell you if this
+is the case.
+
 dit(bf(-h, --help)) When specified after bf(--daemon), print a short help
 page describing the options available for starting an rsync daemon.
 enddit()