Fix GDB build fail on Aarch64 when -fno-common is enabled.

gdb/

	PR gdb/17984
	* aarch64-linux-nat.c: Don't include features/aarch64.c anymore.
	(aarch64_linux_read_description): Remove initialize_tdesc_aarch64 call.
	* aarch64-tdep.h: Add struct target_desc *tdesc_aarch64
	declaration.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 0bd0792..d2352c9 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,11 @@
+2015-02-17  Max Ostapenko  <m.ostapenko@partner.samsung.com>
+
+	PR gdb/17984
+	* aarch64-linux-nat.c: Don't include features/aarch64.c anymore.
+	(aarch64_linux_read_description): Remove initialize_tdesc_aarch64 call.
+	* aarch64-tdep.h: Add struct target_desc *tdesc_aarch64
+	declaration.
+
 2015-02-13  Doug Evans  <dje@google.com>
 
 	* cp-namespace.c (cp_basic_lookup_symbol): Rename parameter
diff --git a/gdb/aarch64-linux-nat.c b/gdb/aarch64-linux-nat.c
index c58f68a..aae4853 100644
--- a/gdb/aarch64-linux-nat.c
+++ b/gdb/aarch64-linux-nat.c
@@ -37,8 +37,6 @@
 
 #include "gregset.h"
 
-#include "features/aarch64.c"
-
 /* Defines ps_err_e, struct ps_prochandle.  */
 #include "gdb_proc_service.h"
 
@@ -830,7 +828,6 @@ aarch64_linux_child_post_startup_inferior (struct target_ops *self,
 static const struct target_desc *
 aarch64_linux_read_description (struct target_ops *ops)
 {
-  initialize_tdesc_aarch64 ();
   return tdesc_aarch64;
 }
 
diff --git a/gdb/aarch64-tdep.h b/gdb/aarch64-tdep.h
index 6a7794d..976ad32 100644
--- a/gdb/aarch64-tdep.h
+++ b/gdb/aarch64-tdep.h
@@ -90,4 +90,6 @@ struct gdbarch_tdep
   struct type *vnb_type;
 };
 
+extern struct target_desc *tdesc_aarch64;
+
 #endif /* aarch64-tdep.h */
-- 
1.8.5.2.2930.gf745acb