Fix sccmap -? to actually print usage instead of error on macOS

Towards https://gitlab.com/graphviz/graphviz/-/issues/1852.

diff --git a/cmd/tools/sccmap.c b/cmd/tools/sccmap.c
index f9a04dac8b0646d03b84118472482854fbb411c9..2bd1f72d26643038a852c32447b3e1d1c80b99da 100644 (file)
--- a/cmd/tools/sccmap.c
+++ b/cmd/tools/sccmap.c
@@ -363,7 +363,7 @@ static void scanArgs(int argc, char **argv)
            fprintf(stderr, "%s: option -%c missing argument - ignored\n", CmdName, optopt);
            break;
        case '?':
-           if (optopt == '\0')
+           if (optopt == '\0' || optopt == '?')
                usage(0);
            else {
                fprintf(stderr, "%s: option -%c unrecognized\n",