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475 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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<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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<li><a href="#dist_targets">Distribution Targets</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>,
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<a href="mailto:criswell@cs.uiuc.edu">John Criswell</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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<!-- ======================================================================= -->
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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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<!-- ======================================================================= -->
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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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<!-- 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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<!--
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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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</div>
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-->
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<!-- *********************************************************************** -->
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<div class="doc_section"><a name="dist_targets">Distribution Targets</a></div>
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<!-- *********************************************************************** -->
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<!-- ======================================================================= -->
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<div class="doc_subsection">Overview</div>
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<div class="doc_text">
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<p>The first thing you need to understand is that there are multiple make
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targets to support this feature. Here's an overview, we'll delve into the
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details later.</p>
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<ul>
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<li><b>distdir</b> - builds the distribution directory from which the
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distribution will be packaged</li>
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<li><b>dist</b> - builds each of the distribution tarballs (tar.gz,
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tar.bzip2, .zip). These can be built individually as well, with separate
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targets.</li>
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<li><b>dist-check</b> - this is identical to <tt>dist</tt> but includes a
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check on the distribution that ensures the tarball can: unpack successfully,
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compile correctly, pass 'make check', and pass 'make clean'.</li>
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<li><b>dist-clean</b>- this just does a normal clean but also cleans up the
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stuff generated by the other three <tt>dist</tt> targets (above).</li>
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</ul>
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<p>Okay, that's the basic functionality. When making a release, we want to
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ensure that the tree you build the distribution from passes
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<tt>dist-check</tt>. Beyond fixing the usual bugs, there is generally one
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impediment to making the release in this fashion: missing files. The
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<tt>dist-check</tt> process guards against that possibility. It will either
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fail and that failure will indicate what's missing, or it will succeed
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meaning that it has proved that the tarballs can actually succeed in
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building LLVM correctly and that it passes <tt>make check</tt>.</p>
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<!-- ======================================================================= -->
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<div class="doc_subsection">distdir</div>
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<p>This target builds the distribution directory which is the directory from
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which the tarballs are generated. The distribution directory has the same
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name as the release, e.g. LLVM-1.7). This target goes through the following
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process:
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<ol>
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<li>First, if there was an old distribution directory (for the current
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release), it is removed in its entirety and you see <tt>Removing old
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LLVM-1.7</tt></li>
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<li>Second, it issues a <tt>make all ENABLE_OPTIMIZED=3D1</tt> to ensure
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that the everything in your tree can be built in release mode. Often times
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there are discrepancies in building between debug and release modes so it
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enforces release mode first. If that fails, the <tt>distdir</tt> target
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fails too. This is preceded by the message <tt>Making 'all' to verify
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build</tt>.</li>
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<li>Next, it traverses your source tree and copies it to a new directory
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that has the name of the release (<tt>LLVM-M.m</tt> in our current case).
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This is the directory that will get tar'd. It contains all the software
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that needs to be in the distribution. During the copying process, it omits
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generated files, CVS directories, and any other "cruft" that's in your
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build tree. This is done to eliminate the possibility of huge distribution
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tarballs that include useless or irrelevant stuff in them. This is the
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trickiest part of making the distribution. Done manually you will either
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include stuff that shouldn't be in the distribution or exclude stuff that
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should. This step is preceded by the message <tt>Building Distribution
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Directory LLVM-1.7</tt></li>
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<li>The distribution directory is then traversed and all <tt>CVS</tt> or
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<tt>.svn</tt> directories are removed. You see: <tt>Eliminating CVS/.svn
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directories from distribution</tt></li>
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<li>The recursive <tt>dist-hook</tt> target is executed. This gives each
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directory a chance to modify the distribution in some way (more on this
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below).</li>
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<li>The distribution directory is traversed and the correct file
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permissions and modes are set based on the type of file.</li>
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</ol>
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<p>To control the process of making the distribution directory correctly,
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each Makefile can utilize two features:</p>
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<ol>
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<li><b><tt>EXTRA_DIST</tt></B> - this make variable specifies which files
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it should distribute. By default, all source files are automatically
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included for distribution as well as certain <tt>well known</tt> files
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(see DistAlways variable in Makefile.rules for details). Each Makefile
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specifies, via the <tt>EXTRA_DIST</tt> variable, which additional files
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need to be distributed. Only those files that are needed to build LLVM
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should be added to <tt>EXTRA_DIST</tt>. <tt>EXTRA_DIST</tt> contains a
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list of file or directory names that should be distributed. For example,
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the top level Makefile contains
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<tt>EXTRA_DIST := test llvm.spec include</tt>.
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This means that in addition to regular things that are distributed at the
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top level (<tt>CREDITS.txt, LICENSE.txt</tt>, etc.) the distribution should
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contain the entire <tt>test</tt> and <tt>include</tt> directories as well
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as the <tt>llvm.spec</tt> file.</li>
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<li><b><tt>dist-hook</tt></B> - this make target can be used to alter the
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content of the distribution directory. For example, in the top level
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Makefile there is some logic to eliminate files in the <tt>include</tt>
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subtree that are generated by the configure script. These should not be
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distributed. Similarly, any <tt>dist-hook</tt> target found in any
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directory can add or remove or modify things just before it gets packaged.
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Any transformation is permitted. Generally, not much is needed.
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</ol>
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<p>You will see various messages if things go wrong:</p>
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<ol>
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<li>During the copying process, any files that are missing will be flagged
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with: <tt>===== WARNING: Distribution Source 'dir/file' Not Found!</tt>
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These must be corrected by either adding the file or removing it from
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<tt>EXTRA_DIST</tt>.
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<li>If you build the distribution with <tt>VERBOSE=1</tt>, then you might
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also see: <tt>Skipping non-existent 'dir/file'</tt> in certain cases where
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its okay to skip the file.</li>
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<li>The target can fail if any of the things it does fail. Error messages
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should indicate what went wrong.</li>
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</ol>
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<!-- ======================================================================= -->
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<div class="doc_subsection">dist</div>
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<p>This target does exactly what <tt>distdir</tt> target does, but also
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includes assembling the tarballs. There are actually four related targets
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here:<p>
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<ul>
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<li><b><tt>dist-gzip</tt></b>: package the gzipped distribution tar
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file. The distribution directory is packaged into a single file ending in
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<tt>.tar.gz</tt> which is gzip compressed.</li>
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<li><b><tt>dist-bzip2</tt></b>: package the bzip2 distribution tar file.
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The distribution directory is packaged into a single file ending in
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<tt>.tar.bzip2</tt> which is bzip2 compressed.</li>
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<li><b><tt>dist-zip</tt></b>: package the zip distribution file. The
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distribution directory is packaged into a single file ending in
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<tt>.zip</tt> which is zip compressed.</li>
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<li><b><tt>dist</tt></b>: does all three, dist-gzip, dist-bzip2,
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dist-zip</li>
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</ul>
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<!-- ======================================================================= -->
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<div class="doc_subsection">dist-check</div>
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<p>This target checks the distribution. The basic idea is that it unpacks the
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distribution tarball and ensures that it can build. It takes the following
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actions:</p>
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<ol>
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<li>It depends on the <tt>dist-gzip</tt> target which, if it hasn't already
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been built, builds the gzip tar bundle (see dist and distdir above).</li>
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<li>removes any pre-existing <tt>_distcheckdir</tt> at the top level.</li>
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<li>creates a new <tt>_distcheckdir</tt> directory at the top level.</li>
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|
<li>creates a <tt>build</tt> subdirectory and an <tt>install</tt>
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|
subdirectory under <tt>_distcheckdir</tt>.</li>
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|
<li>unzips and untars the release tarball into <tt>_distcheckdir</tt>,
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|
creating <tt>LLVM-1.7</tt> directory (from the tarball).</li>
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|
<li>in the build subdirectory, it configures with appropriate options to build
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|
from the unpacked source tarball into the <tt>build</tt> directory with
|
|
installation in the <tt>install</tt> directory.</li>
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|
<li>runs <tt>make all</tt></li>
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|
<li>runs <tt>make </tt><tt>check</tt></li>
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|
<li>runs <tt>make install</tt></li>
|
|
<li>runs <tt>make uninstall</tt></li>
|
|
<li>runs <tt>make dist</tt></li>
|
|
<li>runs <tt>make clean</tt></li>
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|
<li>runs <tt>make dist-clean</tt></li>
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|
</ol>
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<p>If it can pass all that, the distribution will be deemed distribution
|
|
worth y and you will see:<p>
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|
<pre>===== LLVM-1.7.tar.gz Ready For Distribution =====</pre>
|
|
<p>This means the tarball should then be tested on other platforms and have the
|
|
nightly test run against it. If those all pass, THEN it is ready for
|
|
distribution.</p>
|
|
<p>
|
|
A note about disk space: using <tt>dist-check</tt> will easily triple the
|
|
amount of disk space your build tree is using. You might want to check
|
|
available space before you begin.</p>
|
|
<!-- ======================================================================= -->
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<div class="doc_subsection">dist-clean</div>
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|
<h2>dist-clean</h2>
|
|
<p>In addition to doing a normal <tt>clean</tt>, this target will clean up the
|
|
files and directories created by the distribution targets. In particular the
|
|
distribution directory <tt>(LLVM-X.X</tt>), check directory
|
|
(<tt>_distcheckdir</tt>), and the various tarballs will be removed. You do
|
|
this after the release has shipped and you no longer need this stuff in your
|
|
build tree.</p>
|
|
</div>
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<!-- *********************************************************************** -->
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<hr>
|
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<address>
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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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Last modified: $Date$
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