[Bug c++/122677] [modules] g++ cannot write CMI if the repository path is absolute.

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122677

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -4939,8 +4939,13 @@ maybe_add_cmi_prefix (const char *to, size_t *len_p =
NULL)
 static void
 create_dirs (char *path)
 {
+  char *base = path;
+  /* Skip past initial slashes of absolute path.  */
+  while (IS_DIR_SEPARATOR (*base))
+    base++;
+
   /* Try and create the missing directories.  */
-  for (char *base = path; *base; base++)
+  for (; *base; base++)
     if (IS_DIR_SEPARATOR (*base))
       {
        char sep = *base;