Merge linker plugin handling into BFD plugin support

Linker plugin_maybe_claim is the interface of linker plugin support.
This patch extracts linker plugin_maybe_claim into plugin_object_p and
makes it available to BFD via a new function:

void register_ld_plugin_object_p (const bfd_target *(*) (bfd *));

bfd_plugin_object_p calls plugin_object_p registered by linker first.  It
adds an enum bfd_plugin_format field and a pointer to plugin dummy BFD so
that plugin_object_p stores plugin dummy BFD to allow plugin_maybe_claim
to retrieve it later.

bfd/

	PR ld/17878
	* bfd.c (bfd_plugin_format): New.
	(bfd): Add plugin_format and plugin_dummy_bfd.
	* plugin.c (try_load_plugin): Take a pointer to bfd_boolean
	argument to return TRUE if any plugin is found.  Set plugin_format.
	(has_plugin): New.
	(bfd_plugin_target_p): New.
	(bfd_plugin_specified_p): Likewise.
	(bfd_plugin_target_p): Likewise.
	(register_ld_plugin_object_p): Likewise.
	(bfd_plugin_set_plugin): Set has_plugin.
	(load_plugin): Cache try_load_plugin result.
	(bfd_plugin_object_p): Try ld_plugin_object_p first.  Check
	plugin_format.
	* plugin.h (bfd_plugin_target_p): New.
	(bfd_plugin_specified_p): Likewise.
	(register_ld_plugin_object_p): Likewise.
	* bfd-in2.h: Regenerated.

ld/

	PR ld/17878
	* plugin.c: Include ../bfd/plugin.h.
	(plugin_get_ir_dummy_bfd): Call bfd_create with
	link_info.output_bfd instead of srctemplate.  Copy BFD info
	from srctemplate only if it doesn't use BFD plugin target
	vector.
	(plugin_load_plugins): Call register_ld_plugin_object_p with
	(plugin_object_p)
	(plugin_maybe_claim): Renamed to ...
	(plugin_object_p): This.  Return dummy BFD target vector if
	input is calimed by plugin library, otherwise return NULL.
	Update plugin_format and plugin_dummy_bfd.
	(plugin_maybe_claim): New.  Use plugin_object_p.

xx

1 files changed, 14 insertions, 0 deletions

diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h
index 91dbf80..678eaed 100644
--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@@ -6272,6 +6272,13 @@ enum bfd_direction
     both_direction = 3
   };
 
+enum bfd_plugin_format
+  {
+    bfd_plugin_uknown = 0,
+    bfd_plugin_yes = 1,
+    bfd_plugin_no = 2
+  };
+
 struct bfd
 {
   /* The filename the application opened the BFD with.  */
@@ -6428,6 +6435,13 @@ struct bfd
   /* Set if this is the linker output BFD.  */
   unsigned int is_linker_output : 1;
 
+  /* If this is an input for a compiler plug-in library.  */
+  ENUM_BITFIELD (bfd_plugin_format) plugin_format : 2;
+
+  /* Set to dummy BFD created when claimed by a compiler plug-in
+     library.  */
+  bfd *plugin_dummy_bfd;
+
   /* Currently my_archive is tested before adding origin to
      anything. I believe that this can become always an add of
      origin, with origin set to 0 for non archive files.  */