Explicitly specify -? as an option in gc

diff --git a/cmd/tools/gc.c b/cmd/tools/gc.c
index 840fbb5f6100383cdbf7574caf0fea2b73be5429..cafe39d3f52db14abef3c0bc394e097f734aefad 100644 (file)
--- a/cmd/tools/gc.c
+++ b/cmd/tools/gc.c
@@ -89,7 +89,7 @@ static void init(int argc, char *argv[])
     unsigned int c;
 
     opterr = 0;
-    while ((c = getopt(argc, argv, "necCaDUrsv")) != -1) {
+    while ((c = getopt(argc, argv, "necCaDUrsv?")) != -1) {
        switch (c) {
        case 'e':
            flags |= EDGES;
@@ -123,7 +123,7 @@ static void init(int argc, char *argv[])
            gtype = UNDIRECTED;
            break;
        case '?':
-           if (optopt == '?')
+           if (optopt == '\0')
                usage(0);
            else {
                fprintf(stderr, "gc: option -%c unrecognized\n",