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Adding ReleaseProcess doc
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Renato Golin
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docs/ReleaseProcess.rst
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docs/ReleaseProcess.rst
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=============================
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How To Validate a New Release
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=============================
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.. contents::
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:local:
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:depth: 1
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Introduction
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============
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This document contains information about testing the release candidates that will
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ultimately be the next LLVM release. For more information on how to manage the
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actual release, please refer to :doc:`HowToReleaseLLVM <HowToReleaseLLVM>`.
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Overview of the Release Process
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-------------------------------
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Once the release process starts, the Release Manager will ask for volunteers,
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and it'll be the role of each volunteer to:
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* Test and benchmark the previous release
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* Test and benchmark each release candidate, comparing to the previous release and candidates
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* Identify, reduce and report every regression found during tests and benchmarks
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* Make sure the critical bugs get fixed and merged to the next release candidate
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Not all bugs or regressions are show-stoppers and it's a bit of a grey area what
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should be fixed before the next candidate and what can wait until the next release.
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It'll depend on:
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* The severity of the bug, how many people it affects and if it's a regression or a
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known bug. Known bugs are "unsupported features" and some bugs can be disabled if
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they have been implemented recently.
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* The stage in the release. Less critical bugs should be considered to be fixed between
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RC1 and RC2, but not so much at the end of it.
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* If it's a correctness or a performance regression. Performance regression tends to be
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taken more lightly than correctness.
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.. _scripts:
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Scripts
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=======
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The scripts are in the ``utils/release`` directory.
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test-release.sh
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---------------
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This script will configure and compile LLVM+Clang (+ most add-ons, like ``compiler-rt``,
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``libcxx`` and ``clang-extra-tools``) in three stages, and will test the final stage.
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It'll have installed the final binaries on the Phase3/Release+Asserts directory, and
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that's the one you should use for the test-suite and other external tests.
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Tip: For some reason, the script bails on ARM because of path mismatch on configure.
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The solution was to add a symlink inside the rc1 directory to the llvm.src directory::
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mkdir rc1
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cd rc1
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ln -s ../../llvm.src
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cd ..
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To run the script, you must be on the source directory and pass the right options, for example::
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./utils/release/test-release.sh \
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-release 3.3 \
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-rc 1 \
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-no-checkout \
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-no-64bit \
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-test-asserts \
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-no-compare-files
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Each system will require different options. For instance, x86_64 will obviously not need
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``-no-64bit`` while 32-bit systems will, or the script will fail.
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The important flags to get right are:
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* On the pre-release, you should change ``-rc 1`` to ``-final``. On RC2, change it to ``-rc 2`` and so on.
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* On both previous release and candidates you must pass ``-no-checkout`` or it'll get the SVN trunk.
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* You need ``-test-asserts``, or it won't create a "Release+Asserts" directory, which is needed for
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release testing and benchmarking.
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This script builds three phases of Clang+LLVM twice each (Release and Release+Asserts), so use
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screen or nohup to avoid headaches, since it'll take a long time.
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Use the ``--help`` option to see all the options and chose it according to your needs.
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findRegressions-nightly.py
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--------------------------
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TODO
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.. _test-suite:
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Test Suite
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==========
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.. contents::
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:local:
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Follow the `LNT Quick Start Guide <http://llvm.org/docs/lnt/quickstart.html>`__ link on how to set-up the test-suite
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An example on the run command line, assuming you created a link from the correct
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install directory to ``~/devel/llvm/install``::
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./sandbox/bin/python sandbox/bin/lnt runtest \
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nt \
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-j4 \
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--sandbox sandbox \
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--test-suite ~/devel/llvm/test/test-suite \
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--cc ~/devel/llvm/install/bin/clang \
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--cxx ~/devel/llvm/install/bin/clang++
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.. _pre-release-process:
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Pre-Release Process
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===================
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.. contents::
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:local:
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When the release process is announced on the mailing list, you should prepare
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for the testing, by applying the same testing you'll do on the release candidates,
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on the previous release.
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You should:
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* Download the previous release sources from http://llvm.org/releases/download.html.
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* Run the test-release.sh script on ``final`` mode (change ``-rc 1`` to ``-final``).
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* Once all three stages are done, it'll test the final stage.
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* Using the ``Phase3/Release+Asserts/llvmObj-MAJ.MIN-rcN.install`` base, run the test-suite.
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If the final phase's ``make check-all`` failed, it's a good idea to also test the
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intermediate stages by going on the obj directory and running ``make check-all`` to find
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if there's at least one stage that passes (helps when reducing the error for bug report
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purposes).
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.. _release-process:
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Release Process
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===============
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.. contents::
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:local:
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When the Release Manager sends you the release candidate, download all sources,
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unzip on the same directory (there will be sym-links from the appropriate places
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to them), and run the release test as above.
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You should:
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* Download the current candidate sources from where the release manager points you
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(ex. http://llvm.org/pre-releases/3.3/rc1/).
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* Repeat the steps above with ``-rc 1``, ``-rc 2`` etc modes and run the test-suite
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the same way.
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* Compare the results, report all errors on Bugzilla and publish the binary blob
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where the release manager can grab it.
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Once the release manages announces that the latest candidate is the good one, you
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have to pack the ``Release`` (no Asserts) install directory on ``Phase3`` and that
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will be the official binary.
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.. _bug-reporting:
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Bug Reporting Process
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=====================
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.. contents::
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:local:
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If you found regressions or failures when comparing a release candidate with the
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previous release, follow the rules below:
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* Critical bugs on compilation should be fixed as soon as possible, possibly before
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releasing the binary blobs.
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* Check-all tests should be fixed before the next release candidate, but can wait
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until the test-suite run is finished.
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* Bugs in the test suite or unimportant check-all tests can be fixed in between
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release candidates.
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* New features or recent big changes, when close to the release, should have done
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in a way that it's easy to disable. If they misbehave, prefer disabling them than
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releasing an unstable (but untested) binary package.
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