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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>How To Release LLVM To The Public</title>
<link rel="stylesheet" href="llvm.css" type="text/css">
</head>
<body>
<h1>How To Release LLVM To The Public</h1>
<ol>
<li><a href="#introduction">Introduction</a></li>
<li><a href="#criteria">Qualification Criteria</a></li>
<li><a href="#introduction">Release Timeline</a></li>
<li><a href="#process">Release Process</a></li>
</ol>
<div class="doc_author">
<p>Written by <a href="mailto:tonic@nondot.org">Tanya Lattner</a>,
<a href="mailto:rspencer@x10sys.com">Reid Spencer</a>,
<a href="mailto:criswell@cs.uiuc.edu">John Criswell</a>, &
<a href="mailto:wendling@apple.com">Bill Wendling</a>
</p>
</div>
<!-- *********************************************************************** -->
<h2><a name="introduction">Introduction</a></h2>
<!-- *********************************************************************** -->
<div>
<p>This document contains information about successfully releasing LLVM —
including subprojects: e.g., <tt>clang</tt> and <tt>dragonegg</tt> — to
the public. It is the Release Manager's responsibility to ensure that a high
quality build of LLVM is released.</p>
</div>
<!-- *********************************************************************** -->
<h2><a name="process">Release Timeline</a></h2>
<!-- *********************************************************************** -->
<div>
<p>LLVM is released on a time based schedule — roughly every 6 months. We
do not normally have dot releases because of the nature of LLVM's incremental
development philosophy. That said, the only thing preventing dot releases for
critical bug fixes from happening is a lack of resources — testers,
machines, time, etc. And, because of the high quality we desire for LLVM
releases, we cannot allow for a truncated form of release qualification.</p>
<p>The release process is roughly as follows:</p>
<ul>
<li><p>Set code freeze and branch creation date for 6 months after last code
freeze date. Announce release schedule to the LLVM community and update
the website.</p></li>
<li><p>Create release branch and begin release process.</p></li>
<li><p>Send out release candidate sources for first round of testing. Testing
lasts 7-10 days. During the first round of testing, any regressions found
should be fixed. Patches are merged from mainline into the release
branch. Also, all features need to be completed during this time. Any
features not completed at the end of the first round of testing will be
removed or disabled for the release.</p></li>
<li><p>Generate and send out the second release candidate sources. Only
<em>critial</em> bugs found during this testing phase will be fixed. Any
bugs introduced by merged patches will be fixed. If so a third round of
testing is needed.</p></li>
<li><p>The release notes are updated.</p></li>
<li><p>Finally, release!</p></li>
</ul>
</div>
<!-- *********************************************************************** -->
<h2><a name="process">Release Process</a></h2>
<!-- *********************************************************************** -->
<div>
<ol>
<li><a href="#release-admin">Release Administrative Tasks</a>
<ol>
<li><a href="#branch">Create Release Branch</a></li>
<li><a href="#verchanges">Update Version Numbers</a></li>
</ol>
</li>
<li><a href="#release-build">Building the Release</a>
<ol>
<li><a href="#dist">Build the LLVM Source Distributions</a></li>
<li><a href="#build">Build LLVM</a></li>
<li><a href="#clangbin">Build the Clang Binary Distribution</a></li>
<li><a href="#target-build">Target Specific Build Details</a></li>
</ol>
</li>
<li><a href="#release-qualify">Release Qualification Criteria</a>
<ol>
<li><a href="#llvm-qualify">Qualify LLVM</a></li>
<li><a href="#clang-qualify">Qualify Clang</a></li>
<li><a href="#targets">Specific Target Qualification Details</a></li>
</ol>
</li>
<li><a href="#commTest">Community Testing</a></li>
<li><a href="#release-patch">Release Patch Rules</a></li>
<li><a href="#release-final">Release final tasks</a>
<ol>
<li><a href="#updocs">Update Documentation</a></li>
<li><a href="#tag">Tag the LLVM Final Release</a></li>
<li><a href="#updemo">Update the LLVM Demo Page</a></li>
<li><a href="#webupdates">Update the LLVM Website</a></li>
<li><a href="#announce">Announce the Release</a></li>
</ol>
</li>
</ol>
<!-- ======================================================================= -->
<h3><a name="release-admin">Release Administrative Tasks</a></h3>
<div>
<p>This section describes a few administrative tasks that need to be done for
the release process to begin. Specifically, it involves:</p>
<ul>
<li>Creating the release branch,</li>
<li>Setting version numbers, and</li>
<li>Tagging release candidates for the release team to begin testing</li>
</ul>
<!-- ======================================================================= -->
<h4><a name="branch">Create Release Branch</a></h4>
<div>
<p>Branch the Subversion trunk using the following procedure:</p>
<ol>
<li><p>Remind developers that the release branching is imminent and to refrain
from committing patches that might break the build. E.g., new features,
large patches for works in progress, an overhaul of the type system, an
exciting new TableGen feature, etc.</p></li>
<li><p>Verify that the current Subversion trunk is in decent shape by
examining nightly tester and buildbot results.</p></li>
<li><p>Create the release branch for <tt>llvm</tt>, <tt>clang</tt>,
the <tt>test-suite</tt>, and <tt>dragonegg</tt> from the last known good
revision. The branch's name is <tt>release_<i>XY</i></tt>,
where <tt>X</tt> is the major and <tt>Y</tt> the minor release
numbers. The branches should be created using the following commands:</p>
<div class="doc_code">
<pre>
$ svn copy https://llvm.org/svn/llvm-project/llvm/trunk \
https://llvm.org/svn/llvm-project/llvm/branches/release_<i>XY</i>
$ svn copy https://llvm.org/svn/llvm-project/cfe/trunk \
https://llvm.org/svn/llvm-project/cfe/branches/release_<i>XY</i>
$ svn copy https://llvm.org/svn/llvm-project/dragonegg/trunk \
https://llvm.org/svn/llvm-project/dragonegg/branches/release_<i>XY</i>
$ svn copy https://llvm.org/svn/llvm-project/test-suite/trunk \
https://llvm.org/svn/llvm-project/test-suite/branches/release_<i>XY</i>
</pre>
</div></li>
<li><p>Advise developers that they may now check their patches into the
Subversion tree again.</p></li>
<li><p>The Release Manager should switch to the release branch, because all
changes to the release will now be done in the branch. The easiest way to
do this is to grab a working copy using the following commands:</p>
<div class="doc_code">
<pre>
$ svn co https://llvm.org/svn/llvm-project/llvm/branches/release_<i>XY</i> llvm-<i>X.Y</i>
$ svn co https://llvm.org/svn/llvm-project/cfe/branches/release_<i>XY</i> clang-<i>X.Y</i>
$ svn co https://llvm.org/svn/llvm-project/dragonegg/branches/release_<i>XY</i> dragonegg-<i>X.Y</i>
$ svn co https://llvm.org/svn/llvm-project/test-suite/branches/release_<i>XY</i> test-suite-<i>X.Y</i>
</pre>
</div></li>
</ol>
</div>
<!-- ======================================================================= -->
<h4><a name="verchanges">Update LLVM Version</a></h4>
<div>
<p>After creating the LLVM release branch, update the release branches'
<tt>autoconf</tt> and <tt>configure.ac</tt> versions from '<tt>X.Ysvn</tt>'
to '<tt>X.Y</tt>'. Update it on mainline as well to be the next version
('<tt>X.Y+1svn</tt>'). Regenerate the configure scripts for both
<tt>llvm</tt> and the <tt>test-suite</tt>.</p>
<p>In addition, the version numbers of all the Bugzilla components must be
updated for the next release.</p>
</div>
<!-- ======================================================================= -->
<h4><a name="dist">Build the LLVM Release Candidates</a></h4>
<div>
<p>Create release candidates for <tt>llvm</tt>, <tt>clang</tt>,
<tt>dragonegg</tt>, and the LLVM <tt>test-suite</tt> by tagging the branch
with the respective release candidate number. For instance, to
create <b>Release Candidate 1</b> you would issue the following commands:</p>
<div class="doc_code">
<pre>
$ svn mkdir https://llvm.org/svn/llvm-project/llvm/tags/RELEASE_<i>XY</i>
$ svn copy https://llvm.org/svn/llvm-project/llvm/branches/release_<i>XY</i> \
https://llvm.org/svn/llvm-project/llvm/tags/RELEASE_<i>XY</i>/rc1
$ svn mkdir https://llvm.org/svn/llvm-project/cfe/tags/RELEASE_<i>XY</
|
