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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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<p class="doc_warning">NOTE: THIS DOCUMENT IS A WORK IN PROGRESS!</p>
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<ol>
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<li><a href="#introduction">Introduction</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:rspencer@x10sys.com">Reid Spencer</a></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>This document collects information about successfully releasing LLVM to the
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public. It is the release manager's guide to ensuring that a high quality build
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of LLVM is released. Mostly, it's just a bunch of reminders of things to do at
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release time so we don't inadvertently ship something that is utility
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deficient.</p>
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<p>
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There are three main tasks for building a release of LLVM:
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<ol>
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<li>Create the LLVM source distribution.</li>
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<li>Create the LLVM GCC source distribtuion.</li>
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<li>Create a set of LLVM GCC binary distribtuions for each supported
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platform. These binary distributions must include compiled versions
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of the libraries found in <tt>llvm/runtime</tt> from the LLVM
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source distribution created in Step 1.</li>
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</ol>
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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 Process</a></div>
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<!-- *********************************************************************** -->
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="overview">Process Overview</a></div>
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<div class="doc_text">
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<ol>
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<li><a href="#updocs">Update Documentation</a></li>
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<li><a href="#merge">Merge Branches</a></li>
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<li><a href="#deps">Make LibDeps.txt</a></li>
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<li><a href="#settle">Settle LLVM HEAD</a></li>
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<li><a href="#tag">Tag LLVM and Create the Release Branch</a></li>
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<li><a href="#build">Build LLVM</a></li>
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<li><a href="#check">Run 'make check'</a></li>
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<li><a href="#test">Run LLVM Test Suite</a></li>
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<li><a href="#dist">Build the LLVM Source Distributions</a></li>
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<li><a href="#llvmgccbin">Build the LLVM GCC Binary Distribution</a></li>
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</ol>
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</div>
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2006-04-11 20:24:28 +00:00
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="updocs">Update Documentation</a></div>
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<div class="doc_text">
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<p>
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Review the documentation and ensure that it is up to date. The Release Notes
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must be updated to reflect bug fixes, new known issues, and changes in the
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list of supported platforms. The Getting Started Guide should be updated to
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reflect the new release version number tag avaiable from CVS and changes in
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basic system requirements.
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</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="merge">Merge Branches</a></div>
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<div class="doc_text">
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<p>
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Merge any work done on branches intended for release into mainline. Finish and
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commit all new features or bug fixes that are scheduled to go into the release.
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Work that is not to be incorporated into the release should not be merged from
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branchs or commited from developer's working directories.
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</p>
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<p>
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From this point until the release branch is created, developers should
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<em>not</em>
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commit changes to the llvm and llvm-gcc CVS repositories unless it is a bug
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fix <em>for the release</em>.
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</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="deps">Make LibDeps.txt</a></div>
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<div class="doc_text">
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<p>Rebuild the <tt>LibDeps.txt</tt> target in <tt>utils/llvm-config</tt>. This
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makes sure that the <tt>llvm-config</tt> utility remains relevant for the
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release, reflecting any changes in the library dependencies.</p>
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</div>
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2006-04-11 06:21:25 +00:00
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="settle">Settle CVS HEAD</a></div>
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<div class="doc_text">
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<p>
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Use the nightly test reports and 'make check' (deja-gnu based tests) to
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ensure that recent changes and merged branches have not destabilized LLVM.
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Platforms which are used less often should be given special attention as they
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are the most likely to break from commits from the previous step.
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</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="tag">CVS Tag And Branch</a></div>
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<div class="doc_text">
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<p>Tag and branch the CVS HEAD using the following procedure:</p>
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<ol>
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<li>
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Request all developers to refrain from committing. Offenders get commit
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rights taken away (temporarily).
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</li>
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<li>
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The Release Manager updates his/her llvm, llvm-test, and llvm-gcc source
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trees with the
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latest sources from mainline CVS. The Release Manage may want to consider
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using a new working directory for this to keep current uncommitted work
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separate from release work.
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</li>
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<li>
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The Release Manager tags his/her llvm, llvm-test, and llvm-gcc working
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directories with
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"ROOT_RELEASE_XX" where XX is the major and minor
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release numbers (you can't have . in a cvs tag name). So, for Release 1.2,
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XX=12 and for Release 1.10, XX=110.
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</li>
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<li>
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Immediately create cvs branches based on the ROOT_RELEASE_XX tag. The tag
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should be "release_XX" (where XX matches that used for the ROOT_RELEASE_XX
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tag). This is where the release distribution will be created.
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</li>
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<li>
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Advise developers they can work on CVS HEAD again.
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</li>
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<li>
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The Release Manager and any developers working on the release should switch
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to the release branch (as all changes to the release will now be done in
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the branch). The easiest way to do this is to grab another working copy
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using the following commands:
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<p>
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<tt>cvs -d <CVS Repository> co -r release_XX llvm</tt><br>
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<tt>cvs -d <CVS Repository> co -r release_XX llvm-test</tt><br>
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<tt>cvs -d <CVS Repository> co -r release_XX llvm-gcc</tt><br>
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</p>
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</li>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><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 and release (optimized) versions of LLVM on all
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platforms. Ensure the build is warning and error free on each platform.
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</p>
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<p>
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Build a new version of the LLVM GCC front-end after building the LLVM tools.
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Once that is complete, go back to the LLVM source tree and build and install
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the <tt>llvm/runtime</tt> libraries.
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</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="check">Run 'make check'</a></div>
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<div class="doc_text">
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<p>Run <tt>make check</tt> and ensure there are no unexpected failures. If
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there are, resolve the failures, commit them back into the release branch,
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and restart testing by <a href="#build">re-building LLVM</a>.
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</p>
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<p>
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Ensure that 'make check' passes on all platforms for all targets. If certain
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failures cannot be resolved before release time, determine if marking them
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XFAIL is appropriate. If not, fix the bug and go back. The test suite must
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complete with "0 unexpected failures" for release.
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</p>
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="test">LLVM Test Suite</a></div>
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<div class="doc_text">
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<p>Run the llvm-test suite and ensure there are no unacceptable failures.
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If there are, resolve the failures and go back to
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<a href="#build">re-building LLVM</a>. The test suite
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should be run in Nightly Test mode. All tests must pass.
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><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 LLVM, LLVM GCC, and the LLVM Test Suite by
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exporting the source
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from CVS and archiving it. This can be done with the following commands:
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</p>
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<p>
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<tt>cvs -d <CVS Repository> export -r release_XX llvm</tt><br>
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<tt>cvs -d <CVS Repository> export -r release_XX llvm-test</tt><br>
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<tt>cvs -d <CVS Repository> export -r release_XX llvm-gcc</tt><br>
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<tt>mkdir cfrontend; mv llvm-gcc cfrontend/src</tt><br>
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<tt>tar -cvf - llvm | gzip > llvm-X.X.tar.gz</tt><br>
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<tt>tar -cvf - llvm-test | gzip > llvm-test-X.X.tar.gz</tt><br>
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<tt>tar -cvf - cfrontend/src | gzip > cfrontend-X.X.source.tar.gz</tt><br>
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</p>
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2006-04-11 20:24:28 +00:00
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<!-- This is a
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two step process. First, use "make dist" to simply build the distribution. Any
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failures need to be corrected (on the branch). Once "make dist" can be
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successful, do "make dist-check". This target will do the same thing as the
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'dist' target but also test that distribution to make sure it works. This
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ensures that needed files are not missing and that the src tarball can be
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successfully unbacked, built, installed, and cleaned. This two-level testing
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needs to be done on each target platform.
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-->
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</div>
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<!-- ======================================================================= -->
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<div class="doc_subsection"><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 requires performing the following
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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. The LLVM GCC front-end must be installed in
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a directory named <tt>cfrontend/<platform>/llvm-gcc</tt>. For
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example, the Sparc/Solaris directory is named
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<tt>cfrontend/sparc/llvm-gcc</tt>.
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</li>
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<li>
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Build the libraries in <tt>llvm/runtime</tt> and install them into the
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created LLVM GCC installation directory.
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</li>
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<li>
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For systems with non-distributable header files (e.g. Solaris), manually
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remove header files that the GCC build process has "fixed." This process
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is admittedly painful, but not as bad as it looks; these header files are
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almost always easily identifiable with simple grep expressions and are
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installed in only a few directories in the GCC installation directory.
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</li>
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<li>
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Add the copyright files and header file fix script.
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</li>
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<li>
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Archive and compress the installation directory. These can be found in
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previous releases of the LLVM-GCC front-end.
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</li>
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</ol>
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</div>
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2006-04-11 20:24:28 +00:00
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<!--
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<!-- ======================================================================= -->
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<div class="doc_subsection"><a name="release">Release</a></div>
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<div class="doc_text">
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<p>Release the distribution tarball to the public. This consists of generating
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several tarballs. The first set, the source distributions, are automatically
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generated by the "make dist" and "make dist-check". There are gzip, bzip2, and
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zip versions of these bundles.</p>
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<p>The second set of tarballs is the binary release. When "make dist-check"
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succeeds, it will have created an _install directory into which it installed
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the binary release. You need to rename that directory as "llvm" and then
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create tarballs from the contents of that "llvm" directory.</p>
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<p>Finally, use rpm to make an rpm package based on the llvm.spec file. Don't
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forget to update the version number, documentation, etc. in the llvm.spec
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file.</p>
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2006-03-23 06:45:42 +00:00
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</div>
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2006-04-11 20:24:28 +00:00
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-->
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2006-03-23 06:45:42 +00:00
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<!-- *********************************************************************** -->
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<a href="mailto:rspencer@x10sys.com">Reid Spencer</a><br>
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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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