qemu-options: Bail out on unsupported options instead of silently ignoring them

The dangling remainder of the -tdf option revealed a deficiency in our
option parsing: Options that have been declared, but are not supported
in the switch-case statement in vl.c and not handled in the OS-specifc
os_parse_cmd_args() functions are currently silently ignored. We should
rather tell the users that they specified something that we can not
handle, so let's print an error message and exit instead.

Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1525453270-23074-3-git-send-email-thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/vl.c b/vl.c
index b928e3e439..a23acb2861 100644
--- a/vl.c
+++ b/vl.c
@@ -4033,7 +4033,10 @@ int main(int argc, char **argv, char **envp)
                 }
                 break;
             default:
-                os_parse_cmd_args(popt->index, optarg);
+                if (os_parse_cmd_args(popt->index, optarg)) {
+                    error_report("Option not supported in this build");
+                    exit(1);
+                }
             }
         }
     }