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Re: [Linux PATCH] fcntl: add new F_OFD_*32 constants and handle them appropriately
On Thu, 18 Aug 2016, Zack Weinberg wrote:
> We could change the libc headers used on old-ILP32 ABIs so that
> _FILE_OFFSET_BITS=64 is defined by default (matching the LP64-ABI
> headers). This would break the ABI of every shared library that
This. We have a patch
<https://sourceware.org/ml/libc-alpha/2014-03/msg00290.html>, and we have
an analysis <https://sourceware.org/ml/libc-alpha/2014-03/msg00351.html>
providing some evidence, if not for a very large set of libraries, that
_FILE_OFFSET_BITS=64 is the normal way GNU/Linux distributions build
affected libraries. We have, since then, _FILE_OFFSET_BITS=64 support for
fts. (It may be the case that such a patch would no longer build, or
would cause linknamespace tests to fail because of bug 14106 - which would
need addressing with new implementation-namespace symbols before such a
patch could go in.) But this requires someone to take the lead on getting
all the prerequisites into glibc and establishing consensus for the change
(possibly with a more detailed analysis of the use of _FILE_OFFSET_BITS=64
to build affected libraries in GNU/Linux distributions).
--
Joseph S. Myers
joseph@codesourcery.com