gpg: New option --rfc4880bis.

* g10/options.h (struct opt): Add field flags.rfc4880bis.
* g10/gpg.c (oRFC4880bis): new.
(opts): add --rfc4880bis.
(main): Implement that and print a warning.
--

This is option enables experimental features which may be dropped or
changed with the next release.

Signed-off-by: Werner Koch <wk@gnupg.org>

doc/gpg.texi

@@ -2464,6 +2464,13 @@ Reset all packet, cipher and digest options to strict RFC-4880
 behavior. Note that this is currently the same thing as
 @option{--openpgp}.
 
+@item --rfc4880bis
+@opindex rfc4880bis
+Enable experimental features from proposed updates to RFC-4880.  This
+option can be used in addition to the other compliance options.
+Warning: The behavior may change with any GnuPG release and created
+keys or data may not be usable with future GnuPG versions.
+
 @item --rfc2440
 @opindex rfc2440
 Reset all packet, cipher and digest options to strict RFC-2440

g10/gpg.c

@@ -216,6 +216,7 @@ enum cmd_and_opt_values
     oGnuPG,
     oRFC2440,
     oRFC4880,
+    oRFC4880bis,
     oOpenPGP,
     oPGP6,
     oPGP7,
@@ -599,6 +600,7 @@ static ARGPARSE_OPTS opts[] = {
   ARGPARSE_s_n (oGnuPG, "no-pgp8", "@"),
   ARGPARSE_s_n (oRFC2440, "rfc2440", "@"),
   ARGPARSE_s_n (oRFC4880, "rfc4880", "@"),
+  ARGPARSE_s_n (oRFC4880bis, "rfc4880bis", "@"),
   ARGPARSE_s_n (oOpenPGP, "openpgp", N_("use strict OpenPGP behavior")),
   ARGPARSE_s_n (oPGP6, "pgp6", "@"),
   ARGPARSE_s_n (oPGP7, "pgp7", "@"),
@@ -2686,6 +2688,9 @@ main (int argc, char **argv)
             /* Dummy so that gpg 1.4 conf files can work. Should
                eventually be removed.  */
 	    break;
+          case oRFC4880bis:
+            opt.flags.rfc4880bis = 1;
+            /* fall thru.  */
 	  case oOpenPGP:
 	  case oRFC4880:
 	    /* This is effectively the same as RFC2440, but with
@@ -3399,6 +3404,9 @@ main (int argc, char **argv)
     if( may_coredump && !opt.quiet )
 	log_info(_("WARNING: program may create a core file!\n"));
 
+    if (opt.flags.rfc4880bis)
+	log_info ("WARNING: using experimental features from RFC4880bis!\n");
+
     if (eyes_only) {
       if (opt.set_filename)
 	  log_info(_("WARNING: %s overrides %s\n"),

g10/options.h

@@ -235,6 +235,8 @@ struct
     unsigned int allow_weak_digest_algos:1;
     unsigned int large_rsa:1;
     unsigned int disable_signer_uid:1;
+    /* Flag to enbale experimental features from RFC4880bis.  */
+    unsigned int rfc4880bis:1;
   } flags;
 
   /* Linked list of ways to find a key if the key isn't on the local