* c-lex.c [! NO_IMPLICIT_EXTERN_C] (cb_enter_file): Check

        in_system_header and flags[1] before dereferencing flags[2].

From-SVN: r37361

gcc/ChangeLog

+2000-11-09  Hans-Peter Nilsson  <hp@axis.com>
+
+	* c-lex.c [! NO_IMPLICIT_EXTERN_C] (cb_enter_file): Check
+	in_system_header and flags[1] before dereferencing flags[2].
+
 2000-11-09  Matthew Hiller <hiller@redhat.com>
 
 	* reload1.c (reload_combine): Fixed calculation of

gcc/c-lex.c

@@ -714,7 +714,7 @@ cb_enter_file (pfile)
 #ifndef NO_IMPLICIT_EXTERN_C
   if (c_header_level)
     ++c_header_level;
-  else if (flags[2] != 0)
+  else if (in_system_header && flags[1] != 0 && flags[2] != 0)
     {
       c_header_level = 1;
       ++pending_lang_change;