libctf: add root-visibility-addition test

libctf/
	* testsuite/libctf-writable/ctf-nonroot-addition.*: New test.

libctf/testsuite/libctf-writable/ctf-nonroot-addition.c

@@ -0,0 +1,38 @@
+/* Make sure adding a non-root-visible type after adding a root-visible forward
+   adds a new type rather than promoting and returning the existing one.  */
+
+#include <ctf-api.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int
+main (int argc, char *argv[])
+{
+  ctf_dict_t *fp;
+  ctf_id_t root, nonroot;
+  int err;
+
+  if ((fp = ctf_create (&err)) == NULL)
+    {
+      fprintf (stderr, "Cannot create: %s\n", ctf_errmsg (err));
+      return 1;
+    }
+
+  if ((root = ctf_add_forward (fp, CTF_ADD_ROOT, "foo", CTF_K_ENUM)) == CTF_ERR)
+    goto add_err;
+
+  if ((nonroot = ctf_add_enum (fp, CTF_ADD_NONROOT, "foo")) == CTF_ERR)
+    goto add_err;
+
+  if (nonroot == root)
+    fprintf (stderr, "Non-root addition should not promote root-visible forwards\n");
+  else
+    printf ("All done.\n");
+
+  ctf_dict_close (fp);
+  return 0;
+
+ add_err:
+  fprintf (stderr, "Cannot add: %s\n", ctf_errmsg (ctf_errno (fp)));
+}

libctf/testsuite/libctf-writable/ctf-nonroot-addition.lk

@@ -0,0 +1 @@
+All done.