[gdb] Fix warning in foreach_arch selftests

When running the selftests, I run into:
...
$ gdb -q -batch -ex "maint selftest"
  ...
Running selftest execute_cfa_program::aarch64:ilp32.
warning: A handler for the OS ABI "GNU/Linux" is not built into this
configuration of GDB.  Attempting to continue with the default aarch64:ilp32
settings.
...
and likewise for execute_cfa_program::i8086 and
execute_cfa_program::ia64-elf32.

The warning can easily be reproduced outside the selftests by doing:
...
$ gdb -q -batch -ex "set arch aarch64:ilp32"
...
and can be prevented by first doing "set osabi none".

Fix the warning by setting osabi to none while doing selftests that iterate
over all architectures.

Tested on x86_64-linux.

1 files changed, 38 insertions, 12 deletions

diff --git a/gdb/osabi.c b/gdb/osabi.c
index bbd7635..776e620 100644
--- a/gdb/osabi.c
+++ b/gdb/osabi.c
@@ -32,7 +32,7 @@
 #endif
 
 /* State for the "set osabi" command.  */
-static enum { osabi_auto, osabi_default, osabi_user } user_osabi_state;
+static enum gdb_osabi_mode user_osabi_state;
 static enum gdb_osabi user_selected_osabi;
 static const char *gdb_osabi_available_names[GDB_OSABI_INVALID + 3] = {
   "auto",
@@ -595,15 +595,48 @@ generic_elf_osabi_sniffer (bfd *abfd)
   return osabi;
 }
 
+/* See osabi.h.  */
+
+void
+set_osabi (enum gdb_osabi_mode mode, enum gdb_osabi osabi)
+{
+  if (mode == osabi_auto)
+    user_osabi_state = osabi_auto;
+  else if (mode == osabi_default)
+    {
+      user_selected_osabi = GDB_OSABI_DEFAULT;
+      user_osabi_state = osabi_user;
+    }
+  else
+    {
+      user_selected_osabi = osabi;
+      user_osabi_state = osabi_user;
+    }
+
+  /* NOTE: At some point (true multiple architectures) we'll need to be more
+     graceful here.  */
+  gdbarch_info info;
+  if (! gdbarch_update_p (info))
+    internal_error (__FILE__, __LINE__, _("Updating OS ABI failed."));
+}
+
+/* See osabi.h.  */
+
+void
+get_osabi (enum gdb_osabi_mode &mode, enum gdb_osabi &osabi)
+{
+  mode = user_osabi_state;
+  osabi = user_selected_osabi;
+}
+
 static void
 set_osabi (const char *args, int from_tty, struct cmd_list_element *c)
 {
   if (strcmp (set_osabi_string, "auto") == 0)
-    user_osabi_state = osabi_auto;
+    set_osabi (osabi_auto, GDB_OSABI_INVALID);
   else if (strcmp (set_osabi_string, "default") == 0)
     {
-      user_selected_osabi = GDB_OSABI_DEFAULT;
-      user_osabi_state = osabi_user;
+      set_osabi (osabi_default, GDB_OSABI_INVALID);
     }
   else
     {
@@ -615,8 +648,7 @@ set_osabi (const char *args, int from_tty, struct cmd_list_element *c)
 
 	  if (strcmp (set_osabi_string, gdbarch_osabi_name (osabi)) == 0)
 	    {
-	      user_selected_osabi = osabi;
-	      user_osabi_state = osabi_user;
+	      set_osabi (osabi_user, osabi);
 	      break;
 	    }
 	}
@@ -625,12 +657,6 @@ set_osabi (const char *args, int from_tty, struct cmd_list_element *c)
 			_("Invalid OS ABI \"%s\" passed to command handler."),
 			set_osabi_string);
     }
-
-  /* NOTE: At some point (true multiple architectures) we'll need to be more
-     graceful here.  */
-  gdbarch_info info;
-  if (! gdbarch_update_p (info))
-    internal_error (__FILE__, __LINE__, _("Updating OS ABI failed."));
 }
 
 static void