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| author | Andreas Krebbel <krebbel@linux.vnet.ibm.com> | 2014-04-08 16:30:07 +0200 |
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| committer | Andreas Krebbel <krebbel@linux.vnet.ibm.com> | 2014-04-11 13:08:10 +0200 |
| commit | ee4ec1d7f9bdbdfc87117133478cfb2f6653e65c (patch) | |
| tree | 69a9e99d20e0618dc599a9ba1958118850f2ac00 | |
| parent | c12e9f37417240a086c5b9e2fb321f1db8e9547f (diff) | |
| download | glibc-ee4ec1d7f9bdbdfc87117133478cfb2f6653e65c.zip glibc-ee4ec1d7f9bdbdfc87117133478cfb2f6653e65c.tar.gz glibc-ee4ec1d7f9bdbdfc87117133478cfb2f6653e65c.tar.bz2 | |
NEWS: Add comment about changed ABI on s390 and s390x.
| -rw-r--r-- | NEWS | 14 |
1 files changed, 14 insertions, 0 deletions
@@ -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 |