Show usage and exit non-zero for unsupported option in gvedit

Towards https://gitlab.com/graphviz/graphviz/-/issues/1843.

diff --git a/cmd/gvedit/main.cpp b/cmd/gvedit/main.cpp
index 0901e5e3a2642017b9386beebdf09bebd5d25894..b10624ab413964a7abe80ee7e16ccede8db715ef 100644 (file)
--- a/cmd/gvedit/main.cpp
+++ b/cmd/gvedit/main.cpp
@@ -68,9 +68,11 @@ static char **parseArgs(int argc, char *argv[])
        case '?':
            if (optopt == '\0')
                usage(0);
-           else
+           else {
                errout << cmd << " : option -" << ((char) optopt) <<
-                   " unrecognized - ignored\n" << flush;
+                   " unrecognized\n" << flush;
+               usage(1);
+           }
            break;
        }
     }