[PATCH] PR libstdc++/85930 fix misaligned reference

[Jonathan Wakely]

        PR libstdc++/85930
        * include/bits/shared_ptr_base.h (_Sp_make_shared_tag::_S_ti): Align
        the static variable correctly.

Tested powerpc64le-linux, committed to trunk.


commit b0aa443f66d21f904ea0144b16df4b14ef9df09c
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Mon Jun 4 16:45:42 2018 +0100

    PR libstdc++/85930 fix misaligned reference
    
            PR libstdc++/85930
            * include/bits/shared_ptr_base.h (_Sp_make_shared_tag::_S_ti): Align
            the static variable correctly.

diff --git a/libstdc++-v3/include/bits/shared_ptr_base.h 
b/libstdc++-v3/include/bits/shared_ptr_base.h
index b58273a79c5..22cb7eb46b1 100644
--- a/libstdc++-v3/include/bits/shared_ptr_base.h
+++ b/libstdc++-v3/include/bits/shared_ptr_base.h
@@ -516,7 +516,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     static const type_info&
     _S_ti() noexcept
     {
-      static constexpr _Sp_make_shared_tag __tag;
+      static constexpr alignas(type_info) _Sp_make_shared_tag __tag;
       return reinterpret_cast<const type_info&>(__tag);
     }
 #endif