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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>How To Release LLVM To The Public</title>
<link rel="stylesheet" href="llvm.css" type="text/css">
</head>
<body>
<div class="doc_title">How To Release LLVM To The Public</div>
<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>
</p>
</div>
<!-- *********************************************************************** -->
<div class="doc_section"><a name="introduction">Introduction</a></div>
<!-- *********************************************************************** -->
<div class="doc_text">
<p>
This document collects information about successfully releasing LLVM
(including subprojects llvm-gcc and Clang) to the public.
It is the release manager's responsibility to ensure that a high quality
build of LLVM is released.
</p>
</div>
<!-- *********************************************************************** -->
<div class="doc_section"><a name="process">Release Timeline</a></div>
<!-- *********************************************************************** -->
<div class="doc_text">
<p>LLVM is released on a time based schedule (currently every 6 months). We
do not have dot releases because of the nature of LLVM incremental
developement philosophy. The release schedule is roughly as follows:
</p>
<ol>
<li>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.</li>
<li>Create release branch and begin release process. </li>
<li>Send out pre-release for first round of testing. Testing will last 7-10 days.
During the first round of testing, regressions should be found and fixed. Patches
are merged from mainline to the release branch.</li>
<li>Generate and send out second pre-release. Bugs found during this time will
not be fixed unless absolutely critical. Bugs introduce by patches merged in
will be fixed and if so, a 3rd round of testing is needed.</li>
<li>The release notes should be updated during the first and second round of
pre-release testing.</li>
<li>Finally, release!</li>
</ol>
</div>
<!-- *********************************************************************** -->
<div class="doc_section"><a name="process">Release Process</a></div>
<!-- *********************************************************************** -->
<div class="doc_text">
<ol>
<li><a href="#release-admin">Release Administrative Tasks</a></li>
<ol>
<li><a href="#branch">Create Release Branch</a></li>
<li><a href="#verchanges">Update Version Numbers</a></li>
</ol>
<li><a href="#release-build">Building the Release</a></li>
<ol>
<li><a href="#dist">Build the LLVM Source Distributions</a></li>
<li><a href="#build">Build LLVM</a></li>
<li><a href="#llvmgccbin">Build the LLVM-GCC Binary Distribution</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><a href="#release-qualify">Release Qualification Criteria</a></li>
<ol>
<li><a href="#llvm-qualify">Qualify LLVM</a></li>
<li><a href="#llvmgcc-qualify">Qualify LLVM-GCC</a></li>
<li><a href="#clang-qualify">Qualify Clang</a></li>
<li><a href="#targets">Specific Target Qualification Details</a></li>
</ol>
<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></li>
<ol>
<li><a href="#tag">Tag the LLVM Release Branch</a></li>
<li><a href="#updocs">Update Documentation</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>
</ol>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection"><a name="release-admin">
Release Administrative Tasks</a></div>
<div class="doc_text">
This section describes a few administrative tasks that need to be done for the
release process to begin. Specifically, it involves creating the release branch,
resetting version numbers, and creating the release tarballs for the release
team to begin testing.
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="branch">Create Release Branch</a></div>
<div class="doc_text">
<p>Branch the Subversion HEAD using the following procedure:</p>
<ol>
<li>
<p>Verify that the current Subversion HEAD is in decent shape by examining
nightly tester or buildbot results.</p></li>
<li>
<p>Request all developers to refrain from committing. Offenders get commit
rights taken away (temporarily).</p></li>
<li>
<p> Create the release branch for <tt>llvm</tt>, <tt>llvm-gcc4.2</tt>,
<tt>clang</tt>, and the <tt>test-suite</tt>. The branch name will be
<tt>release_XX</tt>,where <tt>XX</tt> is the major and minor release numbers.
Clang will have a different release number than <tt>llvm</tt>/
<tt>llvm-gcc4</tt> since its first release was years later
(still deciding if this will be true or not). These branches
can be created without checking out anything from subversion.
</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>XX</i>
svn copy https://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk \
https://llvm.org/svn/llvm-project/llvm-gcc-4.2/branches/release_<i>XX</i>
svn copy https://llvm.org/svn/llvm-project/test-suite/trunk \
https://llvm.org/svn/llvm-project/test-suite/branches/release_<i>XX</i>
svn copy https://llvm.org/svn/llvm-project/cfe/trunk \
https://llvm.org/svn/llvm-project/cfe/branches/release_<i>XX</i>
</pre>
</div>
<li>
<p>Advise developers they can work on Subversion HEAD again.</p></li>
<li>
<p>The Release Manager should switch to the release branch (as all changes
to the release will now be done in the branch). The easiest way to do this
is to grab another working copy using the following commands:</p>
<div class="doc_code">
<pre>
svn co https://llvm.org/svn/llvm-project/llvm/branches/release_<i>XX</i>
svn co https://llvm.org/svn/llvm-project/llvm-gcc-4.2/branches/release_<i>XX</i>
svn co https://llvm.org/svn/llvm-project/test-suite/branches/release_<i>XX</i>
svn co https://llvm.org/svn/llvm-project/cfe/branches/release_<i>XX</i>
</pre>
</div></li>
</ol>
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="verchanges">Update LLVM Version</a></div>
<div class="doc_text">
<p>
After creating the LLVM release branch, update the release branches'
autoconf/configure.ac version from X.Xsvn to just X.X. Update it on mainline
as well to be the next version (X.X+1svn). Regenerated the configure script
for both. This must be done for both llvm and the test-suite.
</p>
<p>FIXME: Add a note about clang.</p>
<p>In addition, the version number of all the Bugzilla components must be
updated for the next release.
</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="dist">Build the LLVM Source Distributions</a></div>
<div class="doc_text">
<p>
Create source distributions for LLVM, LLVM GCC, Clang, and the LLVM Test
Suite by exporting the source from Subversion and archiving it. This can be
done with the following commands:
</p>
<div class="doc_code">
<pre>
svn export https://llvm.org/svn/llvm-project/llvm/branches/release_<i>XX</i> llvm-X.X
svn export https://llvm.org/svn/llvm-project/llvm-gcc-4.2/branches/release_<i>XX</i> llvm-gcc4.2-X.X.source
svn export https://llvm.org/svn/llvm-project/test-suite/branches/release_<i>XX</i> llvm-test-X.X
svn export https://llvm.org/svn/llvm-project/cfe/branches/release_<i>XX</i> clang-X.X
tar -czvf - llvm-X.X | gzip > llvm-X.X.tar.gz
tar -czvf - llvm-test-X.X | gzip > llvm-test-X.X.tar.gz
tar -czvf - llvm-gcc4.2-X.X.source | gzip > llvm-gcc-4.2-X.X.source.tar.gz
tar -czvf - clang-X.X.source | gzip > clang-X.X.source.tar.gz
</pre>
</div>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection"><a name="release-build">
Building the Release</a></div>
<div class="doc_text">
Info about this. Criteria for a successful build.
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="build">Build LLVM</a></div>
<div class="doc_text">
<p>
Build both debug and release (optimized) versions of LLVM on all
platforms. Ensure the build is warning and error free on each platform.
Note that when building the LLVM GCC Binary, use a release build of LLVM.
</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="llvmgccbin">Build the LLVM GCC Binary Distribution</a></div>
<div class="doc_text">
<p>
Creating the LLVM GCC binary distribution (release/optimized) requires
performing the following steps for each supported platform:
</p>
<ol>
<li>
Build the LLVM GCC front-end by following the directions in the README.LLVM
file. Be sure to build with LLVM_VERSION_INFO=X.X, where X is the major and
minor release numbers.
</li>
<li>
Copy the installation directory to a directory named for the specific target.
For example on Red Hat Enterprise Linux, the directory would be named
<tt>llvm-gcc4.2-2.6-x86-linux-RHEL4</tt>. Archive and compress the new directory.
</li>
</ol>
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="clangbin">Build Clang Binary Distribution</a></div>
<div class="doc_text">
<p>
Creating the Clang binary distribution (release/optimized) requires
performing the following steps for each supported platform:
</p>
<ol>
<li>
Instructions how to build it.
</li>
<li>
Instructions on how to package
</li>
</ol>
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="target-build">Target Specific Build
Details</a></div>
<div class="doc_text">
<p>
Specify what is used to build llvm, llvm-gcc, clang on each target.
</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection"><a name="release-qualify">
Building the Release</a></div>
<div class="doc_text">
How to qualify the release.
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="llvm-qualify">Qualify LLVM</a></div>
<div class="doc_text">
<p>
Details</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="llvmgcc-qualify">Qualify LLVM-GCC</a></div>
<div class="doc_text">
<p>
Details.</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="clang-qualify">Qualify Clang</a></div>
<div class="doc_text">
<p>
Details.</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="targets">Specific Target
Qualification Details</a></div>
<div class="doc_text">
<p>
Details</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection"><a name="commTest">Community Testing</a></div>
<div class="doc_text">
<p>
Once all testing has been completed and appropriate bugs filed, the pre-release
tar balls may be put on the website and the LLVM community is notified. Ask that
all LLVM developers test the release in 2 ways:</p>
<ol>
<li>Download llvm-X.X, llvm-test-X.X, and the appropriate llvm-gcc4 binary.
Run "make check" and the full llvm-test suite (make TEST=nightly report).<li>
<li>Download llvm-X.X, llvm-test-X.X, and the llvm-gcc4 source. Compile
everything. Run "make check" and the full llvm-test suite (make TEST=nightly
report).</li>
</ol>
<p>Ask LLVM developers to submit the report and make check results to the list.
Verify that there are no regressions from the previous release. For
unsupported targets, verify that make check at least is clean.</p>
<p>The first round of pre-release testing will be the longest. During this time,
all regressions must be fixed before the second pre-release is created (repeat
steps 4-8).</p>
<p>If this is the second round of testing, this is only to ensure the bug fixes
previously merged in have not created new major problems. This is not the time
to solve additional and unrelated bugs. If no patches are merged in, the release
is determined to be ready and the release manager may move onto the next step.</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection"><a name="release-patch">Release Patch Rules
</a></div>
<div class="doc_text">
<p>
Details</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection"><a name="release-final">Release Final Tasks
</a></div>
<div class="doc_text">
<p>
Details</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="tag">Tag the Release Branch</a></div>
<div class="doc_text">
<p>Tag the release branch using the following procedure:</p>
<div class="doc_code">
<pre>
svn copy https://llvm.org/svn/llvm-project/llvm/branches/release_XX \
https://llvm.org/svn/llvm-project/llvm/tags/RELEASE_<i>XX</i>
svn copy https://llvm.org/svn/llvm-project/llvm-gcc-4.2/branches/release_XX \
https://llvm.org/svn/llvm-project/llvm-gcc-4.2/tags/RELEASE_<i>XX</i>
svn copy https://llvm.org/svn/llvm-project/test-suite/branches/release_XX \
https://llvm.org/svn/llvm-project/test-suite/tags/RELEASE_<i>XX</i>
</pre>
</div>
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="updocs">Update Documentation</a></div>
<div class="doc_text">
<p>
Review the documentation and ensure that it is up to date. The Release Notes
must be updated to reflect bug fixes, new known issues, and changes in the
list of supported platforms. The Getting Started Guide should be updated to
reflect the new release version number tag avaiable from Subversion and
changes in basic system requirements. Merge both changes from mainline into
the release branch.
</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection"><a name="updemo">Update the LLVM Demo Page</a></div>
<div class="doc_text">
<p>
The LLVM demo page must be updated to use the new release. This consists of
using the llvm-gcc binary and building LLVM. Update the website demo page
configuration to use the new release.</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="webupdates">Update the LLVM Website</a></div>
<div class="doc_text">
<p>
The website must be updated before the release announcement is sent out. Here is
what to do:</p>
<ol>
<li> Check out the <tt>website</tt> module from CVS. </li>
<li> Create a new subdirectory X.X in the releases directory. </li>
<li> Commit the <tt>llvm</tt>, <tt>test-suite</tt>, <tt>llvm-gcc</tt> source,
and <tt>llvm-gcc</tt> binaries in this new directory. </li>
<li> Copy and commit the <tt>llvm/docs</tt> and <tt>LICENSE.txt</tt>
files into this new directory. The docs should be built with BUILD_FOR_WEBSITE=1.</li>
<li> Commit the index.html to the release/X.X directory to redirect (use from previous
release. </li>
<li> Update the <tt>releases/download.html</tt> file with the new release. </li>
<li>Update the <tt>releases/index.html</tt> with the new release and link to
release documentation.</li>
<li> Finally, update the main page (<tt>index.html</tt> and sidebar) to
point to the new release and release announcement. Make sure this all gets
commited back into Subversion.</li>
</ol>
</div>
<!-- ======================================================================= -->
<div class="doc_subsubsection"><a name="announce">Announce the Release</a></div>
<div class="doc_text">
<p>Have Chris send out the release announcement when everything is finished.</p>
</div>
<!-- *********************************************************************** -->
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