cppfiles.c (cpp_read_file): Don't pass zero-length string to _cpp_calc_hash.

	* cppfiles.c (cpp_read_file): Don't pass zero-length string to
	_cpp_calc_hash.

From-SVN: r32808

gcc/ChangeLog

+2000-03-29  Zack Weinberg  <zack@wolery.cumb.org>
+
+	* cppfiles.c (cpp_read_file): Don't pass zero-length string to
+	_cpp_calc_hash.
+
 2000-03-29  Jakub Jelinek  <jakub@redhat.com>
 
 	* dwarf2out.c (gen_enumeration_type_die): If enum has a negative

gcc/cppfiles.c

@@ -623,7 +623,11 @@ cpp_read_file (pfile, fname)
     fname = "";
 
   dummy.nshort = fname;
-  dummy.hash = _cpp_calc_hash (fname, strlen (fname));
+  /* _cpp_calc_hash doesn't like zero-length strings.  */
+  if (*fname == 0)
+    dummy.hash = 0;
+  else
+    dummy.hash = _cpp_calc_hash (fname, strlen (fname));
   slot = (IHASH **) htab_find_slot_with_hash (pfile->all_include_files,
 					      (const void *) &dummy,
 					      dummy.hash, 1);