Directory index zero means '.' (compilation directory)

dwarf.c

@@ -377,7 +377,12 @@ is followed by a single null byte." */
         offset += decode_leb128(p, &dummy);
         
         if (dest_files) {
+            if (dir_index) {
                 dest_files[nfiles].dir = dest_directories[dir_index - 1];
+            } else {
+                /* The current directory of the compilation is understood to be the zeroth entry and is not explicitly represented. */
+                dest_files[nfiles].dir = ".";
+            }
         }
         
         ++nfiles;