[gdbserver] target doesn't support xml features -> crash.

[Pedro Alves <pedro_alves@portugalmail.pt>]

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Daniel,

The new xml features support introduced a gdbserver crash when the target
doesn't implement the target_ops->arch_string method.  win32-i386-low is 
one example.
This patch gets me going.

Ok?

Cheers,
Pedro Alves

---
gdb/gdbserver/ChangeLog:

   * server.c (get_features_xml): Check if target implemented arch_string.
   * win32-i386-low.c (win32_arch_string): New.
    (win32_target_ops): Add win32_arch_string as arch_string member.


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Index: src/gdb/gdbserver/server.c
===================================================================
--- src.orig/gdb/gdbserver/server.c	2007-02-25 12:46:40.000000000 +0000
+++ src/gdb/gdbserver/server.c	2007-02-25 12:55:10.000000000 +0000
@@ -216,7 +216,9 @@
 
   if (features_supported == -1)
     {
-      const char *arch = (*the_target->arch_string) ();
+      const char *arch = NULL;
+      if (the_target->arch_string != NULL)
+	arch = (*the_target->arch_string) ();
 
       if (arch == NULL)
 	features_supported = 0;
Index: src/gdb/gdbserver/win32-i386-low.c
===================================================================
--- src.orig/gdb/gdbserver/win32-i386-low.c	2007-02-25 12:46:42.000000000 +0000
+++ src/gdb/gdbserver/win32-i386-low.c	2007-02-25 13:06:28.000000000 +0000
@@ -1054,6 +1054,12 @@
   return child_xfer_memory (memaddr, (char *) myaddr, len, 1, 0) != len;
 }
 
+static const char *
+win32_arch_string (void)
+{
+  return "i386";
+}
+
 static struct target_ops win32_target_ops = {
   win32_create_inferior,
   win32_attach,
@@ -1066,8 +1072,16 @@
   win32_store_inferior_registers,
   win32_read_inferior_memory,
   win32_write_inferior_memory,
-  0,
-  0
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  NULL,
+  win32_arch_string
 };
 
 /* Initialize the Win32 backend.  */