gdb/

2012-11-09  Pedro Alves  <palves@redhat.com>

	* gdbarch.sh (target_gdbarch) <gdbarch.h>: Reimplement as macro.
	(get_target_gdbarch) <gdbarch.h>: New function.
	(startup_gdbarch) <gdbarch.h>: Declare.
	<gdbarch.c> (target_gdbarch): Delete.
	<gdbarch.c> (deprecated_target_gdbarch_select_hack): Set the
	current inferior's gdbarch.
	<gdbarch.c> (get_target_gdbarch): New function.
	* inferior.c: Include target-descriptions.h.
	(free_inferior): Free target description info.
	(add_inferior_with_spaces): Set the inferior's initial
	architecture.
	(clone_inferior_command): Copy the original inferior's target
	description if it was user specified.
	(initialize_inferiors): Add comment.
	* inferior.h (struct target_desc_info): Forward declare.
	(struct inferior) <gdbarch>: New field.
	* linux-nat.c: Include target-descriptions.h.
	(linux_child_follow_fork): Copy the parent's architecture and
	target description to the child.
	* target-descriptions.c: Include inferior.h.
	(struct target_desc_info): New structure, holding the equivalents
	of ...
	(target_desc_fetched, current_target_desc)
	(target_description_filename): ... these removed globals.
	(get_tdesc_info, target_desc_info_from_user_p)
	(copy_inferior_target_desc_info, target_desc_info_free): New.
	(target_desc_fetched, current_target_desc)
	(target_description_filename): Reimplemented as convenience
	macros.
	(tdesc_filename_cmd_string): New global.
	(set_tdesc_filename_cmd): Copy the string manipulated by the "set
	tdescs filename ..." commands to the per-inferior equivalent.
	(show_tdesc_filename_cmd): Get the value to show from the
	per-inferior description filename.
	(_initilize_target_descriptions): Change the "set/show tdesc
	filename" commands' variable.
	* target-descriptions.h (struct target_desc, struct target_desc_info)
	(struct inferior): Forward declare.
	(target_find_description, target_clear_description)
	(target_current_description): Adjust comments.
	(copy_inferior_target_desc_info, target_desc_info_free)
	(target_desc_info_from_user_p). Declare.

gdb/testsuite/
2012-11-09  Pedro Alves  <palves@redhat.com>

	* gdb.multi/multi-arch.exp: New.

1 files changed, 28 insertions, 6 deletions

diff --git a/gdb/target-descriptions.h b/gdb/target-descriptions.h
index 6a09a90..f0841d1 100644
--- a/gdb/target-descriptions.h
+++ b/gdb/target-descriptions.h
@@ -28,23 +28,45 @@ struct tdesc_type;
 struct tdesc_reg;
 struct target_desc;
 struct target_ops;
+struct target_desc;
+/* An inferior's target description info is stored in this opaque
+   object.  There's one such object per inferior.  */
+struct target_desc_info;
+struct inferior;
 
-/* Fetch the current target's description, and switch the current
+/* Fetch the current inferior's description, and switch its current
    architecture to one which incorporates that description.  */
 
 void target_find_description (void);
 
-/* Discard any description fetched from the current target, and switch
-   the current architecture to one with no target description.  */
+/* Discard any description fetched from the target for the current
+   inferior, and switch the current architecture to one with no target
+   description.  */
 
 void target_clear_description (void);
 
-/* Return the global current target description.  This should only be
-   used by gdbarch initialization code; most access should be through
-   an existing gdbarch.  */
+/* Return the current inferior's target description.  This should only
+   be used by gdbarch initialization code; most access should be
+   through an existing gdbarch.  */
 
 const struct target_desc *target_current_description (void);
 
+/* Copy inferior target description data.  Used for example when
+   handling (v)forks, where child's description is the same as the
+   parent's, since the child really is a copy of the parent.  */
+
+void copy_inferior_target_desc_info (struct inferior *destinf,
+				     struct inferior *srcinf);
+
+/* Free a target_desc_info object.  */
+
+void target_desc_info_free (struct target_desc_info *tdesc_info);
+
+/* Returns true if INFO indicates the target description had been
+   supplied by the user.  */
+
+int target_desc_info_from_user_p (struct target_desc_info *info);
+
 /* Record architecture-specific functions to call for pseudo-register
    support.  If tdesc_use_registers is called and gdbarch_num_pseudo_regs
    is greater than zero, then these should be called as well.