TPF: disable discriminators

[DJ Delorie]

> TARGET_TPF is always defined.  Just use a C if.
> Otherwise ok.

Thanks, checked in as attached.

What about older branches?  4.7 needs this patch, 4.6 needs my
original patch.

2012-07-31  DJ Delorie  <dj@redhat.com>

	* config/s390/s390.c (s390_option_override): Disable DWARF 3/4
	extensions for TPF, unless specifically selected.

Index: gcc/config/s390/s390.c
===================================================================
--- gcc/config/s390/s390.c	(revision 190022)
+++ gcc/config/s390/s390.c	(working copy)
@@ -1651,12 +1651,22 @@ s390_option_override (void)
     flag_prefetch_loop_arrays = 1;
 
   /* Use the alternative scheduling-pressure algorithm by default.  */
   maybe_set_param_value (PARAM_SCHED_PRESSURE_ALGORITHM, 2,
                          global_options.x_param_values,
                          global_options_set.x_param_values);
+
+  if (TARGET_TPF)
+    {
+      /* Don't emit DWARF3/4 unless specifically selected.  The TPF
+	 debuggers do not yet support DWARF 3/4.  */
+      if (!global_options_set.x_dwarf_strict) 
+	dwarf_strict = 1;
+      if (!global_options_set.x_dwarf_version)
+	dwarf_version = 2;
+    }
 }
 
 /* Map for smallest class containing reg regno.  */
 
 const enum reg_class regclass_map[FIRST_PSEUDO_REGISTER] =
 { GENERAL_REGS, ADDR_REGS, ADDR_REGS, ADDR_REGS,