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[nfc] announce removal schedule for implicit auto keyword #23553

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dpiparo merged 4 commits into from
Oct 1, 2026
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[nfc] announce removal schedule for implicit auto keyword #23553

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[nfc] announce removal schedule for implicit auto keyword
ferdymercury Sep 30, 2026
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rebase
ferdymercury Sep 30, 2026
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Update index.md
ferdymercury Sep 30, 2026
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[nfc] adjust schedule to after ROOT 6.44
ferdymercury Sep 30, 2026
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1 change: 1 addition & 0 deletions README/ReleaseNotes/v642/index.md
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Expand Up @@ -44,6 +44,7 @@ The following people have contributed to this new version:
Note that `all=ON` enables several of these options, so building with `-Dall=ON` now requires all of their dependencies to be installed, or the unwanted ones to be disabled explicitly.
Build options that are enabled by default, such as `pyroot`, `opengl`, `xml`, `sqlite`, `davix`, `curl`, `tmva-cpu` or `tpython` are not affected: they are still disabled automatically when their dependencies are missing.
* The option `fail-on-missing=OFF` will no longer be honored for CMake ROOT build options that have easy-to-install dependencies (e.g. via homebrew or apt-get), such as those required by options `cfitsio`, `civetweb`, `fftw3`, `imt`, `mathmore`, `nlohmann_json`, `tmva-cpu`, `unuran`, `vdt` or `xrootd`. Before, associated `builtin_option` was automatically turned ON (or the opt-in feature turned to OFF), now, user has to install system package or manually set `builtin_option` to `ON` or opt-in feature to `OFF`.
* The use of `CINT`-like implicit declarations such as `i = 0` is deprecated since [ROOT 6.32](https://root.cern/doc/v632/release-notes.html#deprecation-and-removal) and emits warnings `declaration without the 'auto' keyword is deprecated`. ROOT 6.44 will be the last release to support this syntax, after ROOT 6.44, the warning will turn into an error. Update those declarations by explicitly using the `auto` keyword: `auto i = 0`.
* The legacy evaluation backend of RooFit and the related `RooFit::BatchMode()` command argument are deprecated and will be removed in ROOT 6.44. See the RooFit section below for details.
* The method `RooRealVar::removeRange()` and the corresponding method in `RooErrorVar` that were deprecated in ROOT 6.40 are now removed.
* The overloads of `RooAbsReal::createChi2()` and `RooAbsReal::chi2FitTo()` that take unbinned **RooDataSet** data objects were deprecated in ROOT 6.40 and are now removed.
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