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[cppabi64] Document that interference constants are not ABI stable #389

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[cppabi64] Document that interference constants are not ABI stable #389

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14 changes: 14 additions & 0 deletions cppabi64/cppabi64.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -234,6 +234,9 @@ changes to the content of the document for that release.
| | | - new sections on Contributions_, |
| | | `Trademark notice`_, and Copyright_ |
+---------+------------------------------+-------------------------------------------------------------------+
| 2026Q2 | 01\ :sup:`st` April 2026 | - document that `std::hardware_constructive_interference_size` and|
| | | `std::hardware_destructive_interference_size` are not ABI stable|
+---------+------------------------------+-------------------------------------------------------------------+

References
----------
Expand Down Expand Up @@ -419,6 +422,17 @@ ABI as specified.
`EH ABI Level III: Implementation ABI for GNU Linux`_ describes the EH
Level III ABI used on GNU/Linux systems.

The ISO C++ Standard Library
----------------------------

The ABI for the Arm Architecture places no additional requirements on
implementation defined properties of the C++ standard library. This
includes the hardware specific constants such as **ISO C++ §**\ 17.6.5
**Hardware interference size**. The
`std::hardware_destructive_interference_size` and
`std::hardware_constructive_size` are not defined by this ABI, may
vary between CPU implementations, and are known not to be ABI stable
in C++ library implementations.

The C++ ABI Supplement
======================
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