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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83849 91177308-0d34-0410-b5e6-96231b3b80d8
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525 lines
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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"http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>How To Release LLVM To The Public</title>
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<link rel="stylesheet" href="llvm.css" type="text/css">
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</head>
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<body>
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<div class="doc_title">How To Release LLVM To The Public</div>
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<ol>
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<li><a href="#introduction">Introduction</a></li>
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<li><a href="#criteria">Qualification Criteria</a></li>
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<li><a href="#introduction">Release Timeline</a></li>
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<li><a href="#process">Release Process</a></li>
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</ol>
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<div class="doc_author">
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<p>Written by <a href="mailto:tonic@nondot.org">Tanya Lattner</a>,
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<a href="mailto:rspencer@x10sys.com">Reid Spencer</a>,
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<a href="mailto:criswell@cs.uiuc.edu">John Criswell</a>
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</p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section"><a name="introduction">Introduction</a></div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>
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This document collects information about successfully releasing LLVM
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(including subprojects llvm-gcc and Clang) to the public.
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It is the release manager's responsibility to ensure that a high quality
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build of LLVM is released.
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</p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section"><a name="process">Release Timeline</a></div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<p>LLVM is released on a time based schedule (currently every 6 months). We
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do not have dot releases because of the nature of LLVM incremental
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development philosophy. The release schedule is roughly as follows:
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</p>
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<ol>
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<li>Set code freeze and branch creation date for 6 months after last code freeze
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date. Announce release schedule to the LLVM community and update the website.</li>
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<li>Create release branch and begin release process. </li>
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<li>Send out pre-release for first round of testing. Testing will last 7-10 days.
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During the first round of testing, regressions should be found and fixed. Patches
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are merged from mainline to the release branch.</li>
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<li>Generate and send out second pre-release. Bugs found during this time will
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not be fixed unless absolutely critical. Bugs introduce by patches merged in
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will be fixed and if so, a 3rd round of testing is needed.</li>
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<li>The release notes should be updated during the first and second round of
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pre-release testing.</li>
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<li>Finally, release!</li>
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</ol>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section"><a name="process">Release Process</a></div>
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<!-- *********************************************************************** -->
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<div class="doc_text">
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<ol>
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<li><a href="#release-admin">Release Administrative Tasks</a></li>
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<ol>
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<li><a href="#branch">Create Release Branch</a></li>
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<li><a href="#verchanges">Update Version Numbers</a></li>
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</ol>
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<li><a href="#release-build">Building the Release</a></li>
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<ol>
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<li><a href="#dist">Build the LLVM Source Distributions</a></li>
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<li><a href="#build">Build LLVM</a></li>
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<li><a href="#llvmgccbin">Build the LLVM-GCC Binary Distribution</a></li>
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<li><a href="#clangbin">Build the Clang Binary Distribution</a></li>
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<li><a href="#target-build">Target Specific Build Details</a></li>
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</ol>
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<li><a href="#release-qualify">Release Qualification Criteria</a></li>
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<ol>
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<li><a href="#llvm-qualify">Qualify LLVM</a></li>
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<li><a href="#llvmgcc-qualify">Qualify LLVM-GCC</a></li>
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<li><a href="#clang-qualify">Qualify Clang</a></li>
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<li><a href="#targets">Specific Target Qualification Details</a></li>
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</ol>
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<li><a href="#commTest">Community Testing</a></li>
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<li><a href="#release-patch">Release Patch Rules</a></li>
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<li><a href="#release-final">Release final tasks</a></li>
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<ol>
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<li><a href="#updocs">Update Documentation</a></li>
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<li><a href="#tag">Tag the LLVM Release Branch</a></li>
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<li><a href="#updemo">Update the LLVM Demo Page</a></li>
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<li><a href="#webupdates">Update the LLVM Website</a></li>
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<li><a href="#announce">Announce the Release</a></li>
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</ol>
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</ol>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="release-admin">
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Release Administrative Tasks</a></div>
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<div class="doc_text">
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This section describes a few administrative tasks that need to be done for the
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release process to begin. Specifically, it involves creating the release branch,
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resetting version numbers, and creating the release tarballs for the release
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team to begin testing.
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsubsection"><a name="branch">Create Release Branch</a></div>
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<div class="doc_text">
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<p>Branch the Subversion HEAD using the following procedure:</p>
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<ol>
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<li>
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<p>Verify that the current Subversion HEAD is in decent shape by examining
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nightly tester or buildbot results.</p></li>
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<li>
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<p>Request all developers to refrain from committing. Offenders get commit
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rights taken away (temporarily).</p></li>
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<li>
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<p> Create the release branch for <tt>llvm</tt>, <tt>llvm-gcc4.2</tt>,
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<tt>clang</tt>, and the <tt>test-suite</tt>. The branch name will be
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<tt>release_XX</tt>,where <tt>XX</tt> is the major and minor release numbers.
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<tt>Clang</tt> will have a different release number than <tt>llvm</tt>/
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<tt>llvm-gcc4</tt> since its first release was years later
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(still deciding if this will be true or not). These branches
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can be created without checking out anything from subversion.
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</p>
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<div class="doc_code">
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<pre>
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svn copy https://llvm.org/svn/llvm-project/llvm/trunk \
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https://llvm.org/svn/llvm-project/llvm/branches/release_<i>XX</i>
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svn copy https://llvm.org/svn/llvm-project/llvm-gcc-4.2/trunk \
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https://llvm.org/svn/llvm-project/llvm-gcc-4.2/branches/release_<i>XX</i>
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svn copy https://llvm.org/svn/llvm-project/test-suite/trunk \
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https://llvm.org/svn/llvm-project/test-suite/branches/release_<i>XX</i>
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svn copy https://llvm.org/svn/llvm-project/cfe/trunk \
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https://llvm.org/svn/llvm-project/cfe/branches/release_<i>XX</i>
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</pre>
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</div>
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<li>
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<p>Advise developers they can work on Subversion HEAD again.</p></li>
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<li>
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<p>The Release Manager should switch to the release branch (as all changes
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to the release will now be done in the branch). The easiest way to do this
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is to grab another working copy using the following commands:</p>
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<div class="doc_code">
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<pre>
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svn co https://llvm.org/svn/llvm-project/llvm/branches/release_<i>XX</i>
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svn co https://llvm.org/svn/llvm-project/llvm-gcc-4.2/branches/release_<i>XX</i>
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svn co https://llvm.org/svn/llvm-project/test-suite/branches/release_<i>XX</i>
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svn co https://llvm.org/svn/llvm-project/cfe/branches/release_<i>XX</i>
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</pre>
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</div></li>
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</ol>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsubsection"><a name="verchanges">Update LLVM Version</a></div>
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<div class="doc_text">
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<p>
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After creating the LLVM release branch, update the release branches'
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autoconf/configure.ac version from X.Xsvn to just X.X. Update it on mainline
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as well to be the next version (X.X+1svn). Regenerated the configure script
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for both. This must be done for both <tt>llvm</tt> and the
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<tt>test-suite</tt>.
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</p>
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<p>FIXME: Add a note about <tt>clang</tt>.</p>
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<p>In addition, the version number of all the Bugzilla components must be
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updated for the next release.
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</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsubsection"><a name="dist">Build the LLVM Source Distributions</a></div>
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<div class="doc_text">
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<p>
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Create source distributions for <tt>LLVM</tt>, <tt>LLVM-GCC</tt>,
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<tt>clang</tt>, and the llvm <tt>test-suite</tt> by exporting the source from
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Subversion and archiving it. This can be done with the following commands:
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</p>
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<div class="doc_code">
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<pre>
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svn export https://llvm.org/svn/llvm-project/llvm/branches/release_<i>XX</i> llvm-X.X
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svn export https://llvm.org/svn/llvm-project/llvm-gcc-4.2/branches/release_<i>XX</i> llvm-gcc4.2-X.X.source
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svn export https://llvm.org/svn/llvm-project/test-suite/branches/release_<i>XX</i> llvm-test-X.X
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svn export https://llvm.org/svn/llvm-project/cfe/branches/release_<i>XX</i> clang-X.X
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tar -czvf - llvm-X.X | gzip > llvm-X.X.tar.gz
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tar -czvf - llvm-test-X.X | gzip > llvm-test-X.X.tar.gz
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tar -czvf - llvm-gcc4.2-X.X.source | gzip > llvm-gcc-4.2-X.X.source.tar.gz
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tar -czvf - clang-X.X | gzip > clang-X.X.tar.gz
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</pre>
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</div>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="release-build">
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Building the Release</a></div>
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<div class="doc_text">
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The build of <tt>llvm</tt>, <tt>llvm-gcc</tt>, and <tt>clang</tt> must be free
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of errors and warnings in both debug, release, and release-asserts builds.
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If all builds are clean, then the release passes build qualification.
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<ol>
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<li>debug: ENABLE_OPTIMIZED=0</li>
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<li>release: ENABLE_OPTIMIZED=1</li>
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<li>release-asserts: ENABLE_OPTIMIZED=1 DISABLE_ASSERTIONS=1</li>
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</ol>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsubsection"><a name="build">Build LLVM</a></div>
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<div class="doc_text">
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<p>
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Build both debug, release (optimized), and release-asserts versions of
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LLVM on all supported platforms. Direction to build llvm are
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<a href="http://llvm.org/docs/GettingStarted.html#quickstart">here</a>.
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</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsubsection"><a name="llvmgccbin">Build the LLVM GCC Binary Distribution</a></div>
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<div class="doc_text">
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<p>
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Creating the LLVM GCC binary distribution (release/optimized) requires
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performing the following steps for each supported platform:
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</p>
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<ol>
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<li>
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Build the LLVM GCC front-end by following the directions in the README.LLVM
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file. The frontend must be compiled with c, c++, objc (mac only),
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objc++ (mac only) and fortran support. </li>
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<li>Please boostrap as well.</li>
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<li>Be sure to build with LLVM_VERSION_INFO=X.X, where X is the major and
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minor release numbers.
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</li>
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<li>
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Copy the installation directory to a directory named for the specific target.
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For example on Red Hat Enterprise Linux, the directory would be named
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<tt>llvm-gcc4.2-2.6-x86-linux-RHEL4</tt>. Archive and compress the new directory.
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</li>
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</ol>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsubsection"><a name="clangbin">Build Clang
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Binary Distribution</a></div>
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<div class="doc_text">
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<p>
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Creating the Clang binary distribution (debug/release/release-asserts) requires
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performing the following steps for each supported platform:
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</p>
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<ol>
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<li>
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Build clang according to the directions
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<a href="http://clang.llvm.org/get_started.html">here</a>.
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</li>
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<li>Build both a debug and release version of clang, but the binary
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will be a release build.</lI>
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<li>
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Package clang (details to follow).
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</li>
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</ol>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsubsection"><a name="target-build">Target Specific Build
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Details</a></div>
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<div class="doc_text">
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<p>
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The table below specifies which compilers are used for each arch/os combination
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when qualifying the build of <tt>llvm</tt>, <tt>llvm-gcc</tt>, <tt>clang.
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</tt></p>
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<p>
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<table>
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<tr><th>Architecture</th><th>OS</th><th>compiler</th></tr>
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<tr><td>x86-32</td><td>Mac OS 10.5</td><td>gcc 4.0.1</td></tr>
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<tr><td>x86-32</td><td>Linux</td><td>gcc 4.2.X, gcc 4.3.X</td></tr>
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<tr><td>x86-32</td><td>FreeBSD</td><td>gcc 4.2.X</td></tr>
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<tr><td>x86-32</td><td>mingw</td><td>gcc 3.4.5</td></tr>
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<tr><td>x86-64</td><td>Mac OS 10.5</td><td>gcc 4.0.1</td></tr>
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<tr><td>x86-64</td><td>Linux</td><td>gcc 4.2.X, gcc 4.3.X</td></tr>
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<tr><td>x86-64</td><td>FreeBSD</td><td>gcc 4.2.X</td></tr>
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</table>
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</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="release-qualify">
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Building the Release</a></div>
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<div class="doc_text">
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A release is qualified when it has no regressions from the previous
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release (or baseline). Regressions are related to correctness only and not
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performance at this time. <b>Regressions are new failures in the set of tests that
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are used to qualify each product and only include things on the list.
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Ultimately, there is no end to the number of possible bugs in a release. We
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need a very concrete and definitive release criteria that ensures we have
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monotonically improving quality on some metric. The metric we use is
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described below. This doesn't mean that we don't care about other things,
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but this are things that must be satisfied before a release can go out</b>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsubsection"><a name="llvm-qualify">Qualify LLVM</a></div>
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<div class="doc_text">
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<p>
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LLVM is qualified when it has a clean dejagnu test run without a frontend and
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it has no regressions when using either <tt>llvm-gcc</tt> or <tt>clang</tt>
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with the <tt>test-suite</tt> from the previous release.
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</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsubsection"><a name="llvmgcc-qualify">Qualify LLVM-GCC</a></div>
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<div class="doc_text">
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<p>
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<tt>LLVM-GCC</tt> is qualified when front-end specific tests in the
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<tt>llvm</tt> dejagnu test suite all pass and there are no regressions in
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the <tt>test-suite</tt>.</p>
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<p>We do not use the gcc dejagnu test suite as release criteria.</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsubsection"><a name="clang-qualify">Qualify Clang</a></div>
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<div class="doc_text">
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<tt>Clang</tt> is qualified when front-end specific tests in the
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<tt>llvm</tt> dejagnu test suite all pass, clang's own test suite passes
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cleanly, and there are no regressions in the <tt>test-suite</tt>.</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsubsection"><a name="targets">Specific Target
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Qualification Details</a></div>
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<div class="doc_text">
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<p><table>
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<tr><th>Architecture</th><th>OS</th><th>llvm-gcc baseline</th><th>clang baseline
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</th><th>tests</th></tr>
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<tr><td>x86-32</td><td>Mac OS 10.5</td><td>last release</td><td>none</td><td>llvm dejagnu, clang tests, test-suite (including spec)</td></tr>
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<tr><td>x86-32</td><td>Linux</td><td>last release</td><td>none</td><td>llvm dejagnu, clang tests, test-suite (including spec)</td></tr>
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<tr><td>x86-32</td><td>FreeBSD</td><td>none</td><td>none</td><td>llvm dejagnu, clang tests, test-suite</td></tr>
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<tr><td>x86-32</td><td>mingw</td><td>last release</td><td>none</td><td>QT</td></tr>
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<tr><td>x86-64</td><td>Mac OS 10.5</td><td>last release</td><td>none</td><td>llvm dejagnu, clang tests, test-suite (including spec)</td></tr>
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<tr><td>x86-64</td><td>Linux</td><td>last release</td><td>none</td><td>llvm dejagnu, clang tests, test-suite (including spec)</td></tr>
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<tr><td>x86-64</td><td>FreeBSD</td><td>none</td><td>none</td><td>llvm dejagnu, clang tests, test-suite</td></tr>
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</table></p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="commTest">Community Testing</a></div>
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<div class="doc_text">
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<p>
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Once all testing has been completed and appropriate bugs filed, the pre-release
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tar balls may be put on the website and the LLVM community is notified. Ask that
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all LLVM developers test the release in 2 ways:</p>
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<ol>
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<li>Download llvm-X.X, llvm-test-X.X, and the appropriate llvm-gcc4
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and/or clang binary. Build LLVM.
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Run "make check" and the full llvm-test suite (make TEST=nightly report).</li>
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<li>Download llvm-X.X, llvm-test-X.X, and the llvm-gcc4 and/or clang source.
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Compile everything. Run "make check" and the full llvm-test suite (make TEST=nightly
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report).</li>
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</ol>
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<p>Ask LLVM developers to submit the report and make check results to the list.
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Attempt to verify that there are no regressions from the previous release.
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The results are not used to qualify a release, but to spot other potential
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problems. For unsupported targets, verify that make check at least is
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clean.</p>
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<p>During the first round of testing time,
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all regressions must be fixed before the second pre-release is created.</p>
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<p>If this is the second round of testing, this is only to ensure the bug
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fixes previously merged in have not created new major problems. This is not
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the time to solve additional and unrelated bugs. If no patches are merged in,
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the release is determined to be ready and the release manager may move onto
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the next step.
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</p>
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</div>
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|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection"><a name="release-patch">Release Patch Rules
|
|
</a></div>
|
|
<div class="doc_text">
|
|
<p>
|
|
Below are the rules regarding patching the release branch.</p>
|
|
<p>
|
|
<li>Patches applied to the release branch are only applied by the release
|
|
manager.</li>
|
|
<li>During the first round of testing, patches that fix regressions or that
|
|
are small and relatively risk free (verified by the appropriate code owner)
|
|
are applied to the branch. Code owners are asked to be very conservative in
|
|
approving patches for the branch and we reserve the right to reject any patch
|
|
that does not fix a regression as previously defined.</li>
|
|
<li>During the remaining rounds of testing, only patches that fix regressions
|
|
may be applied.</li>
|
|
|
|
</p>
|
|
</div>
|
|
|
|
|
|
<!-- ======================================================================= -->
|
|
<div class="doc_subsection"><a name="release-final">Release Final Tasks
|
|
</a></div>
|
|
<div class="doc_text">
|
|
<p>
|
|
The final stages of the release process involving taging the release branch,
|
|
updating documentation that refers to the release, and updating the demo
|
|
page.</p>
|
|
<p>FIXME: Add a note if anything needs to be done to the clang website.
|
|
Eventually the websites will be merged hopefully.</p>
|
|
</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_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_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,
|
|
<tt>clang source</tt>, <tt>clang binaries</tt>,
|
|
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
|
|
committed 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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|
|
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<a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a>
|
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<br>
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Last modified: $Date$
|
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</address>
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