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NEWS: Add comment about changed ABI on s390 and s390x.

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Andreas Krebbel 2014-04-08 16:30:07 +02:00
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@ -151,6 +151,20 @@ Version 2.19
* Preliminary documentation about Multi-Thread, Async-Signal and
Async-Cancel Safety has been added.
* Change of ABI data structures for s390 and s390x:
On s390 and s390x the size of struct ucontext and jmp_buf was increased to
allow for future hardware extensions. All library functions that accept or
return these structures were versioned in order to provide backwards
compatibility with existing code. However, not all cases can be handled
with interface versioning. If an application embeds either structure into
another structure and that structure is passed to another compilation unit
which expects the newer larger-sized object then any access to the new
fields will result in undefined behaviour. Similarly any access to fields
that were moved by the enlarging of the structures will cause undefined
behaviour. To fix the undefined behaviour all objects that are part of the
final in-memory image must agree on the size of structures, and this may
require recompilation.
Version 2.18