D17048: Restore sendfile support

[David Edmundson]

davidedmundson created this revision.
Herald added a project: Frameworks.
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davidedmundson requested review of this revision.

REVISION SUMMARY
  Somehow in the kdelibs -> framework port the cmake checks for
  HAVE_SENDFILE got lost.
  
  That removes a massive optimisation in the file kioslave that we're
  skipping seemingly accidentally.

TEST PLAN
  Put a compilation fail inside the #ifdef, before it wasn't triggered, now it is.
  
  Ran unit tests
  Moved a file in dolphin

REPOSITORY
  R241 KIO

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D17048

AFFECTED FILES
  src/ioslaves/file/ConfigureChecks.cmake
  src/ioslaves/file/config-kioslave-file.h.cmake

To: davidedmundson
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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