On 03/23/2011 11:40 AM, Ken Brown wrote: >> Usually it shouldn't. While you can write into a mmaped area beyond >> EOF up to the end of the last page, it doesn't make a lot of sense. >> The data will never show up in the mapped file. >> >> I have no idea if there are applications out there which rely on this >> crude behaviour. > > It doesn't look like there's going to be an autoconf change to resolve > this: > > http://lists.gnu.org/archive/html/autoconf/2011-03/msg00041.html
Unless the right thing to do in autoconf is to separate the test into two levels; one of whether most mmap works but you can't extend files (cygwin always passes) and one whether writing beyond EOF works as required by POSIX (cygwin currently fails on W64, but hopefully fewer packages rely on this stricter behavior). Or figure out a way to make cygwin work around the W64 limitations. -- Eric Blake ebl...@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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