[PATCH] aarch64: fix elf_machine_dynamic compile error [BZ #29835]

[linzhuorong via Libc-alpha <libc-alpha@sourceware.org>]

elf_machine_dynamic compile error when compiling glibc with --enable-static-pie option turned on, static executables do not have symbol _DYNAMIC

Fixes: bca0f5cbc9257c13322b99e55235c4f21ba0bd82("aarch64: Make elf_machine_{load_address,dynamic} robust [BZ #28203]")

Signed-off-by linzhuorong <linzhuorong@huawei.com>
---
 sysdeps/aarch64/dl-machine.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sysdeps/aarch64/dl-machine.h b/sysdeps/aarch64/dl-machine.h
index ae8b14425a..49b1d1ea0e 100644
--- a/sysdeps/aarch64/dl-machine.h
+++ b/sysdeps/aarch64/dl-machine.h
@@ -53,8 +53,9 @@ elf_machine_load_address (void)
 static inline ElfW(Addr) __attribute__ ((unused))
 elf_machine_dynamic (void)
 {
-  extern ElfW(Dyn) _DYNAMIC[] attribute_hidden;
-  return (ElfW(Addr)) _DYNAMIC - elf_machine_load_address ();
+  /* Declaring this hidden ensures that a PC-relative reference is uesed.  */
+  extern const ElfW(Addr) _GLOBAL_OFFSET_TABLE_[] attribute_hidden;
+  return _GLOBAL_OFFSET_TABLE_[0];
 }
 
 /* Set up the loaded object described by L so its unrelocated PLT
-- 
2.12.3