1 =============================
2 How To Validate a New Release
3 =============================
12 This document contains information about testing the release candidates that
13 will ultimately be the next LLVM release. For more information on how to
14 manage the actual release, please refer to :doc:`HowToReleaseLLVM`.
16 Overview of the Release Process
17 -------------------------------
19 Once the release process starts, the Release Manager will ask for volunteers,
20 and it'll be the role of each volunteer to:
22 * Test and benchmark the previous release
24 * Test and benchmark each release candidate, comparing to the previous release
27 * Identify, reduce and report every regression found during tests and benchmarks
29 * Make sure the critical bugs get fixed and merged to the next release candidate
31 Not all bugs or regressions are show-stoppers and it's a bit of a grey area what
32 should be fixed before the next candidate and what can wait until the next
37 * The severity of the bug, how many people it affects and if it's a regression
38 or a known bug. Known bugs are "unsupported features" and some bugs can be
39 disabled if they have been implemented recently.
41 * The stage in the release. Less critical bugs should be considered to be
42 fixed between RC1 and RC2, but not so much at the end of it.
44 * If it's a correctness or a performance regression. Performance regression
45 tends to be taken more lightly than correctness.
52 The scripts are in the ``utils/release`` directory.
57 This script will check-out, configure and compile LLVM+Clang (+ most add-ons,
58 like ``compiler-rt``, ``libcxx``, ``libomp`` and ``clang-extra-tools``) in
59 three stages, and will test the final stage.
60 It'll have installed the final binaries on the Phase3/Releasei(+Asserts)
61 directory, and that's the one you should use for the test-suite and other
64 To run the script on a specific release candidate run::
73 Each system will require different options. For instance, x86_64 will
74 obviously not need ``-no-64bit`` while 32-bit systems will, or the script will
77 The important flags to get right are:
79 * On the pre-release, you should change ``-rc 1`` to ``-final``. On RC2,
80 change it to ``-rc 2`` and so on.
82 * On non-release testing, you can use ``-final`` in conjunction with
83 ``-no-checkout``, but you'll have to create the ``final`` directory by hand
84 and link the correct source dir to ``final/llvm.src``.
86 * For release candidates, you need ``-test-asserts``, or it won't create a
87 "Release+Asserts" directory, which is needed for release testing and
88 benchmarking. This will take twice as long.
90 * On the final candidate you just need Release builds, and that's the binary
91 directory you'll have to pack.
93 This script builds three phases of Clang+LLVM twice each (Release and
94 Release+Asserts), so use screen or nohup to avoid headaches, since it'll take
97 Use the ``--help`` option to see all the options and chose it according to
101 findRegressions-nightly.py
102 --------------------------
114 Follow the `LNT Quick Start Guide
115 <http://llvm.org/docs/lnt/quickstart.html>`__ link on how to set-up the
118 The binary location you'll have to use for testing is inside the
119 ``rcN/Phase3/Release+Asserts/llvmCore-REL-RC.install``.
120 Link that directory to an easier location and run the test-suite.
122 An example on the run command line, assuming you created a link from the correct
123 install directory to ``~/devel/llvm/install``::
125 ./sandbox/bin/python sandbox/bin/lnt runtest \
129 --test-suite ~/devel/llvm/test/test-suite \
130 --cc ~/devel/llvm/install/bin/clang \
131 --cxx ~/devel/llvm/install/bin/clang++
133 It should have no new regressions, compared to the previous release or release
134 candidate. You don't need to fix all the bugs in the test-suite, since they're
135 not necessarily meant to pass on all architectures all the time. This is
136 due to the nature of the result checking, which relies on direct comparison,
137 and most of the time, the failures are related to bad output checking, rather
138 than bad code generation.
140 If the errors are in LLVM itself, please report every single regression found
141 as blocker, and all the other bugs as important, but not necessarily blocking
142 the release to proceed. They can be set as "known failures" and to be
143 fix on a future date.
145 .. _pre-release-process:
153 When the release process is announced on the mailing list, you should prepare
154 for the testing, by applying the same testing you'll do on the release
155 candidates, on the previous release.
159 * Download the previous release sources from
160 http://llvm.org/releases/download.html.
162 * Run the test-release.sh script on ``final`` mode (change ``-rc 1`` to
165 * Once all three stages are done, it'll test the final stage.
167 * Using the ``Phase3/Release+Asserts/llvmCore-MAJ.MIN-final.install`` base,
170 If the final phase's ``make check-all`` failed, it's a good idea to also test
171 the intermediate stages by going on the obj directory and running
172 ``make check-all`` to find if there's at least one stage that passes (helps
173 when reducing the error for bug report purposes).
183 When the Release Manager sends you the release candidate, download all sources,
184 unzip on the same directory (there will be sym-links from the appropriate places
185 to them), and run the release test as above.
189 * Download the current candidate sources from where the release manager points
190 you (ex. http://llvm.org/pre-releases/3.3/rc1/).
192 * Repeat the steps above with ``-rc 1``, ``-rc 2`` etc modes and run the
193 test-suite the same way.
195 * Compare the results, report all errors on Bugzilla and publish the binary blob
196 where the release manager can grab it.
198 Once the release manages announces that the latest candidate is the good one,
199 you have to pack the ``Release`` (no Asserts) install directory on ``Phase3``
200 and that will be the official binary.
202 * Rename (or link) ``clang+llvm-REL-ARCH-ENV`` to the .install directory
204 * Tar that into the same name with ``.tar.gz`` extensioan from outside the
207 * Make it available for the release manager to download
211 Bug Reporting Process
212 =====================
217 If you found regressions or failures when comparing a release candidate with the
218 previous release, follow the rules below:
220 * Critical bugs on compilation should be fixed as soon as possible, possibly
221 before releasing the binary blobs.
223 * Check-all tests should be fixed before the next release candidate, but can
224 wait until the test-suite run is finished.
226 * Bugs in the test suite or unimportant check-all tests can be fixed in between
229 * New features or recent big changes, when close to the release, should have
230 done in a way that it's easy to disable. If they misbehave, prefer disabling
231 them than releasing an unstable (but untested) binary package.