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              <title>How To Release LLVM To The Public</title>

            
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            <div class="doc_title">How To Release LLVM To The Public</div>

            
            <p class="doc_warning">NOTE: THIS DOCUMENT IS A WORK IN PROGRESS!</p>

            
            <ol>

            
              <li><a href="#introduction">Introduction</a></li>

            
              <li><a href="#process">Release Process</a></li>

            
              <li><a href="#dist_targets">Distribution Targets</a></li>

            
            </ol>

            
            <div class="doc_author">

            
              <p>Written by <a href="mailto:rspencer@x10sys.com">Reid Spencer</a>,

            
              <a href="mailto:criswell@cs.uiuc.edu">John Criswell</a></p>

            
            </div>


            <!-- *********************************************************************** -->

            
            <div class="doc_section"><a name="introduction">Introduction</a></div>

            
            <!-- *********************************************************************** -->


            <div class="doc_text">

            
            <p>This document collects information about successfully releasing LLVM to the

            
            public. It is the release manager's guide to ensuring that a high quality build

            
            of LLVM is released. Mostly, it's just a bunch of reminders of things to do at

            
            release time so we don't inadvertently ship something that is utility

            
            deficient.</p>


            <p>

            
            There are three main tasks for building a release of LLVM:

            
            <ol>

            
              <li>Create the LLVM source distribution.</li>

            
              <li>Create the LLVM GCC source distribtuion.</li>

            
              <li>Create a set of LLVM GCC binary distribtuions for each supported

            
                  platform.  These binary distributions must include compiled versions

            
                  of the libraries found in <tt>llvm/runtime</tt> from the LLVM

            
                  source distribution created in Step 1.</li>

            
            </ol>

            
            </p>

            
            </div>


            <!-- *********************************************************************** -->

            
            <div class="doc_section"><a name="process">Release Process</a></div>

            
            <!-- *********************************************************************** -->


            <!-- ======================================================================= -->

            
            <div class="doc_subsection"><a name="overview">Process Overview</a></div>

            
            <div class="doc_text">

            
              <ol>

            
                <li><a href="#updocs">Update Documentation</a></li>

            
                <li><a href="#merge">Merge Branches</a></li>

            
                <li><a href="#deps">Make LibDeps.txt</a></li>

            
                <li><a href="#settle">Settle LLVM HEAD</a></li>

            
                <li><a href="#tag">Tag LLVM and Create the Release Branch</a></li>

            
                <li><a href="#verchanges">Update LLVM Version </a></li>

            
                <li><a href="#build">Build LLVM</a></li>

            
                <li><a href="#check">Run 'make check'</a></li>

            
                <li><a href="#test">Run LLVM Test Suite</a></li>

            
                <li><a href="#dist">Build the LLVM Source Distributions</a></li>

            
                <li><a href="#rpm">Build RPM Packages (optional)</a></li>

            
                <li><a href="#llvmgccbin">Build the LLVM GCC Binary Distribution</a></li>

            
                <li><a href="#webupdates">Update the LLVM Website</a></li>

            
              </ol>

            
            </div>


            <!-- ======================================================================= -->

            
            <div class="doc_subsection"><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 CVS and changes in

            
              basic system requirements.

            
              </p>

            
            </div>


            <!-- ======================================================================= -->

            
            <div class="doc_subsection"><a name="merge">Merge Branches</a></div>

            
            <div class="doc_text">

            
            <p>

            
            Merge any work done on branches intended for release into mainline. Finish and

            
            commit all new features or bug fixes that are scheduled to go into the release.

            
            Work that is not to be incorporated into the release should not be merged from

            
            branchs or commited from developer's working directories.

            
            </p>


            <p>

            
            From this point until the release branch is created, developers should

            
            <em>not</em>

            
            commit changes to the llvm and llvm-gcc CVS repositories unless it is a bug

            
            fix <em>for the release</em>.

            
            </p>

            
            </div>


            <!-- ======================================================================= -->

            
            <div class="doc_subsection"><a name="deps">Make LibDeps.txt</a></div>

            
            <div class="doc_text">

            
              <p>Rebuild the <tt>LibDeps.txt</tt> target in <tt>utils/llvm-config</tt>. This

            
              makes sure that the <tt>llvm-config</tt> utility remains relevant for the

            
              release, reflecting any changes in the library dependencies.</p>

            
            </div>


            <!-- ======================================================================= -->

            
            <div class="doc_subsection"><a name="settle">Settle CVS HEAD</a></div>

            
            <div class="doc_text">

            
              <p>

            
              Use the nightly test reports and 'make check' (deja-gnu based tests) to

            
              ensure that recent changes and merged branches have not destabilized LLVM.

            
              Platforms which are used less often should be given special attention as they

            
              are the most likely to break from commits from the previous step.

            
              </p>

            
            </div>


            <!-- ======================================================================= -->

            
            <div class="doc_subsection"><a name="tag">CVS Tag And Branch</a></div>

            
            <div class="doc_text">

            
              <p>Tag and branch the CVS HEAD using the following procedure:</p>

            
              <ol>

            
                <li>

            
                Request all developers to refrain from committing. Offenders get commit

            
                rights taken away (temporarily).

            
                </li>


                <li>

            
                The Release Manager updates his/her llvm, llvm-test, and llvm-gcc source

            
                trees with the

            
                latest sources from mainline CVS.  The Release Manage may want to consider

            
                using a new working directory for this to keep current uncommitted work

            
                separate from release work.

            
                </li>


                <li>

            
                The Release Manager tags his/her llvm, llvm-test, and llvm-gcc working

            
                directories with

            
                "ROOT_RELEASE_XX" where XX is the major and minor

            
                release numbers (you can't have . in a cvs tag name). So, for Release 1.2,

            
                XX=12 and for Release 1.10, XX=110.


                <p>

            
                <tt>cvs tag ROOT_RELEASE_XX</tt><br>

            
                </p>

            
                </li>


                <li>

            
                Immediately create cvs branches based on the ROOT_RELEASE_XX tag. The tag

            
                should be "release_XX" (where XX matches that used for the ROOT_RELEASE_XX

            
                tag).  This is where the release distribution will be created.


                <p>

            
                cvs tag -b -r ROOT_RELEASE_XX release_XX

            
                </p>

            
                </li>


                <li>

            
                Advise developers they can work on CVS HEAD again.

            
                </li>


                <li>

            
                The Release Manager and any developers working on the release should switch

            
                to the release branch (as all changes to the release will now be done in

            
                the branch).  The easiest way to do this is to grab another working copy

            
                using the following commands:


                <p>

            
                <tt>cvs -d &lt;CVS Repository&gt; co -r release_XX llvm</tt><br>

            
                <tt>cvs -d &lt;CVS Repository&gt; co -r release_XX llvm-test</tt><br>

            
                <tt>cvs -d &lt;CVS Repository&gt; co -r release_XX llvm-gcc</tt><br>

            
                </p>

            
                </li>

            
            </div>


            <!-- ======================================================================= -->

            
            <div class="doc_subsection"><a name="verchanges">Update LLVM Version</a></div>

            
            <div class="doc_text">

            
              <p>

            
              After creating the llvm release branch, update the release branch's autoconf/configure.ac

            
              version from X.Xcvs to just X.X. Update it on mainline as well to be the next version

            
              (X.X+1cvs).

            
              </p>


            </div>


            <!-- ======================================================================= -->

            
            <div class="doc_subsection"><a name="build">Build LLVM</a></div>

            
            <div class="doc_text">

            
              <p>

            
              Build both debug and release (optimized) versions of LLVM on all

            
              platforms. Ensure the build is warning and error free on each platform.

            
              </p>


              <p>

            
              Build a new version of the LLVM GCC front-end after building the LLVM tools.

            
              Once that is complete, go back to the LLVM source tree and build and install

            
              the <tt>llvm/runtime</tt> libraries.

            
              </p>

            
            </div>


            <!-- ======================================================================= -->

            
            <div class="doc_subsection"><a name="check">Run 'make check'</a></div>

            
            <div class="doc_text">

            
              <p>Run <tt>make check</tt> and ensure there are no unexpected failures. If

            
              there are, resolve the failures, commit them back into the release branch,

            
              and restart testing by <a href="#build">re-building LLVM</a>.

            
              </p>


              <p>

            
              Ensure that 'make check' passes on all platforms for all targets. If certain

            
              failures cannot be resolved before release time, determine if marking them

            
              XFAIL is appropriate. If not, fix the bug and go back. The test suite must

            
              complete with "0 unexpected failures" for release.

            
              </p>

            
            </div>


            <!-- ======================================================================= -->

            
            <div class="doc_subsection"><a name="test">LLVM Test Suite</a></div>

            
            <div class="doc_text">

            
              <p>Run the llvm-test suite and ensure there are no unacceptable failures.

            
              If there are, resolve the failures and go back to

            
              <a href="#build">re-building LLVM</a>. The test suite

            
              should be run in Nightly Test mode. All tests must pass.

            
            </div>


            <!-- ======================================================================= -->

            
            <div class="doc_subsection"><a name="dist">Build the LLVM Source Distributions</a></div>

            
            <div class="doc_text">

            
              <p>

            
              Create source distributions for LLVM, LLVM GCC, and the LLVM Test Suite by

            
              exporting the source

            
              from CVS and archiving it.  This can be done with the following commands:

            
              </p>


              <p>

            
              <tt>cvs -d &lt;CVS Repository&gt; export -r release_XX llvm</tt><br>

            
              <tt>cvs -d &lt;CVS Repository&gt; export -r release_XX llvm-test</tt><br>

            
              <tt>cvs -d &lt;CVS Repository&gt; export -r release_XX llvm-gcc</tt><br>

            
              <tt>mkdir cfrontend; mv llvm-gcc cfrontend/src</tt><br>

            
              <tt>tar -cvf - llvm          | gzip &gt; llvm-X.X.tar.gz</tt><br>

            
              <tt>tar -cvf - llvm-test     | gzip &gt; llvm-test-X.X.tar.gz</tt><br>

            
              <tt>tar -cvf - cfrontend/src | gzip &gt; cfrontend-X.X.source.tar.gz</tt><br>

            
              </p>

            
            </div>


            <!-- ======================================================================= -->

            
            <div class="doc_subsection"><a name="rpm">Building RPM packages (optional)</a></div>

            
            <div class="doc_text">

            
              <p>You can, optionally, create source and binary RPM packages for LLVM. These

            
              may make it easier to get LLVM into a distribution. This can be done with

            
              the following commands:</p>

            
              <pre>

            
              make dist        # Build the distribution source tarball

            
              make dist-check  # Check that the source tarball can build itself.

            
              cp llvm-M.m.tar.gz /usr/src/redhat/SOURCES  # Required by rpmbuild

            
              make srpm # for source rpm

            
              make rpm  # for binary rpm

            
              </pre>

            
              <p>First, use "make dist" to simply build the distribution. Any

            
              failures need to be corrected (on the branch). Once "make dist" can be

            
              successful, do "make dist-check". This target will do the same thing as the

            
              'dist' target but also test that distribution to make sure it can build itself

            
              and runs "make check" as well. This ensures that needed files are not

            
              missing and that the src tarball can be successfully unpacked, built,

            
              installed, and cleaned. Once you have a reliable tarball, you need to copy

            
              it to the /usr/src/redhat/SOURCES directory which is a requirement of the

            
              rpmbuild tool. The last two "make" invocations just run rpmbuild to build

            
              either a source (<tt>srpm</tt>) or binary (<tt>rpm</tt>) RPM package.</p>

            
            </div>


            <!-- ======================================================================= -->

            
            <div class="doc_subsection"><a name="llvmgccbin">Build the LLVM GCC Binary Distribution</a></div>

            
            <div class="doc_text">

            
              <p>

            
              Creating the LLVM GCC binary distribution requires performing the following

            
              steps for each supported platform:

            
              </p>


              <ol>

            
                <li>

            
                Build the LLVM GCC front-end.  The LLVM GCC front-end must be installed in

            
                a directory named <tt>cfrontend/&lt;platform&gt;/llvm-gcc</tt>.  For

            
                example, the Sparc/Solaris directory is named

            
                <tt>cfrontend/sparc/llvm-gcc</tt>.

            
                </li>


                <li>

            
                Build the libraries in <tt>llvm/runtime</tt> and install them into the

            
                created LLVM GCC installation directory.

            
                </li>


                <li>

            
                For systems with non-distributable header files (e.g. Solaris), manually

            
                remove header files that the GCC build process has "fixed."  This process

            
                is admittedly painful, but not as bad as it looks; these header files are

            
                almost always easily identifiable with simple grep expressions and are

            
                installed in only a few directories in the GCC installation directory.

            
                </li>


                <li>

            
                Add the copyright files and header file fix script.

            
                </li>


                <li>

            
                Archive and compress the installation directory.  These can be found in

            
                previous releases of the LLVM-GCC front-end.

            
                </li>

            
              </ol>

            
            </div>


            <!-- ======================================================================= -->

            
            <div class="doc_subsection"><a name="webupdates">Update the LLVM Website</a></div>

            
            <div class="doc_text">

            
              <p>

            
              Check out the llvm-www module from cvs. Create a new subdirectory X.X in the

            
              releases directory. Place the llvm, llvm-test, llvm-gcc source, and llvm-gcc

            
              binaries in this new directory. Copy the llvm/docs and LICENSE.txt files

            
              into this new directory. Update the releases/download.html file with  the new release.

            
              Update the releases/index.html with the new release. Finally, update the main page (

            
              index.html and sidebar) to point to the new release and release announcement. Make

            
              sure this all gets commited back into cvs.

            
              </p>

            
            </div>


            <!--

            
            <div class="doc_subsection"><a name="release">Release</a></div>

            
            <div class="doc_text">

            
              <p>Release the distribution tarball to the public. This consists of generating

            
              several tarballs. The first set, the source distributions, are automatically

            
              generated by the "make dist" and "make dist-check". There are gzip, bzip2, and

            
              zip versions of these bundles.</p>

            
              <p>The second set of tarballs is the binary release. When "make dist-check"

            
              succeeds, it will have created an _install directory into which it installed

            
              the binary release. You need to rename that directory as "llvm" and then

            
              create tarballs from the contents of that "llvm" directory.</p>

            
              <p>Finally, use rpm to make an rpm package based on the llvm.spec file. Don't

            
              forget to update the version number, documentation, etc. in the llvm.spec

            
              file.</p>

            
            </div>

            
            -->


            <!-- *********************************************************************** -->

            
            <div class="doc_section"><a name="dist_targets">Distribution Targets</a></div>

            
            <!-- *********************************************************************** -->

            
            <!-- ======================================================================= -->

            
            <div class="doc_subsection">Overview</div>

            
            <div class="doc_text">

            
            <p>The first thing you need to understand is that there are multiple make

            
            targets to support this feature. Here's an overview, we'll delve into the

            
            details later.</p>

            
            <ul>

            
              <li><b>distdir</b> - builds the distribution directory from which the

            
              distribution will be packaged</li>

            
              <li><b>dist</b> - builds each of the distribution tarballs (tar.gz,

            
              tar.bzip2, .zip). These can be built individually as well, with separate

            
              targets.</li>

            
              <li><b>dist-check</b> - this is identical to <tt>dist</tt> but includes a

            
              check on the distribution that ensures the tarball can: unpack successfully,

            
              compile correctly, pass 'make check', and pass 'make clean'.</li>

            
              <li><b>dist-clean</b>- this just does a normal clean but also cleans up the

            
              stuff generated by the other three <tt>dist</tt> targets (above).</li>

            
            </ul>

            
            <p>Okay, that's the basic functionality. When making a release, we want to

            
            ensure that the tree you build the distribution from passes

            
            <tt>dist-check</tt>. Beyond fixing the usual bugs, there is generally one

            
            impediment to making the release in this fashion: missing files. The

            
            <tt>dist-check</tt> process guards against that possibility. It will either

            
            fail and that failure will indicate what's missing, or it will succeed

            
            meaning that it has proved that the tarballs can actually succeed in

            
            building LLVM correctly and that it passes <tt>make check</tt>.</p>

            
            <!-- ======================================================================= -->

            
            <div class="doc_subsection">distdir</div>

            
            <p>This target builds the distribution directory which is the directory from

            
            which the tarballs are generated. The distribution directory has the same

            
            name as the release, e.g. LLVM-1.7). This target goes through the following

            
            process:

            
            <ol>

            
              <li>First, if there was an old distribution directory (for the current

            
              release), it is removed in its entirety and you see <tt>Removing old

            
              LLVM-1.7</tt></li>

            
              <li>Second, it issues a <tt>make all ENABLE_OPTIMIZED=3D1</tt> to ensure

            
              that the everything in your tree can be built in release mode. Often times

            
              there are discrepancies in building between debug and release modes so it

            
              enforces release mode first. If that fails, the <tt>distdir</tt> target

            
              fails too. This is preceded by the message <tt>Making 'all' to verify

            
              build</tt>.</li>

            
              <li>Next, it traverses your source tree and copies it to a new directory

            
              that has the name of the release (<tt>LLVM-M.m</tt> in our current case).

            
              This is the directory that will get tar'd. It contains all the software

            
              that needs to be in the distribution. During the copying process, it omits

            
              generated files, CVS directories, and any other "cruft" that's in your

            
              build tree. This is done to eliminate the possibility of huge distribution

            
              tarballs that include useless or irrelevant stuff in them. This is the

            
              trickiest part of making the distribution. Done manually you will either

            
              include stuff that shouldn't be in the distribution or exclude stuff that

            
              should. This step is preceded by the message <tt>Building Distribution

            
              Directory LLVM-1.7</tt></li>

            
              <li>The distribution directory is then traversed and all <tt>CVS</tt> or

            
              <tt>.svn</tt> directories are removed. You see: <tt>Eliminating CVS/.svn

            
              directories from distribution</tt></li>

            
              <li>The recursive <tt>dist-hook</tt> target is executed. This gives each

            
              directory a chance to modify the distribution in some way (more on this

            
              below).</li>

            
              <li>The distribution directory is traversed and the correct file

            
              permissions and modes are set based on the type of file.</li>

            
            </ol>

            
            <p>To control the process of making the distribution directory correctly,

            
            each Makefile can utilize two features:</p>

            
            <ol>

            
              <li><b><tt>EXTRA_DIST</tt></B> - this make variable specifies which files

            
              it should distribute. By default, all source files are automatically

            
              included for distribution as well as certain <tt>well known</tt> files

            
              (see DistAlways variable in Makefile.rules for details). Each Makefile

            
              specifies, via the <tt>EXTRA_DIST</tt> variable, which additional files

            
              need to be distributed. Only those files that are needed to build LLVM

            
              should be added to <tt>EXTRA_DIST</tt>. <tt>EXTRA_DIST</tt> contains a

            
              list of file or directory names that should be distributed. For example,

            
              the top level Makefile contains

            
              <tt>EXTRA_DIST := test llvm.spec include</tt>.

            
              This means that in addition to regular things that are distributed at the

            
              top level (<tt>CREDITS.txt, LICENSE.txt</tt>, etc.) the distribution should

            
              contain the entire <tt>test</tt> and <tt>include</tt> directories as well

            
              as the <tt>llvm.spec</tt> file.</li>

            
              <li><b><tt>dist-hook</tt></B> - this make target can be used to alter the

            
              content of the distribution directory. For example, in the top level

            
              Makefile there is some logic to eliminate files in the <tt>include</tt>

            
              subtree that are generated by the configure script. These should not be

            
              distributed. Similarly, any <tt>dist-hook</tt> target found in any

            
              directory can add or remove or modify things just before it gets packaged.

            
              Any transformation is permitted. Generally, not much is needed.

            
            </ol>

            
            <p>You will see various messages if things go wrong:</p>

            
            <ol>

            
              <li>During the copying process, any files that are missing will be flagged

            
              with: <tt>===== WARNING: Distribution Source 'dir/file' Not Found!</tt>

            
              These must be corrected by either adding the file or removing it from

            
              <tt>EXTRA_DIST</tt>.

            
              <li>If you build the distribution with <tt>VERBOSE=1</tt>, then you might

            
              also see: <tt>Skipping non-existent 'dir/file'</tt> in certain cases where

            
              its okay to skip the file.</li>

            
              <li>The target can fail if any of the things it does fail. Error messages

            
              should indicate what went wrong.</li>

            
            </ol>

            
            <!-- ======================================================================= -->

            
            <div class="doc_subsection">dist</div>

            
            <p>This target does exactly what <tt>distdir</tt> target does, but also

            
            includes assembling the tarballs. There are actually four related targets

            
            here:<p>

            
              <ul>

            
                <li><b><tt>dist-gzip</tt></b>: package the gzipped distribution tar

            
                file. The distribution directory is packaged into a single file ending in

            
                <tt>.tar.gz</tt> which is gzip compressed.</li>

            
                <li><b><tt>dist-bzip2</tt></b>: package the bzip2 distribution tar file.

            
                The distribution directory is packaged into a single file ending in

            
                <tt>.tar.bzip2</tt> which is bzip2 compressed.</li>

            
                <li><b><tt>dist-zip</tt></b>: package the zip distribution file. The

            
                distribution directory is packaged into a single file ending in

            
                <tt>.zip</tt> which is zip compressed.</li>

            
                <li><b><tt>dist</tt></b>: does all three, dist-gzip, dist-bzip2,

            
                dist-zip</li>

            
              </ul>

            
            <!-- ======================================================================= -->

            
            <div class="doc_subsection">dist-check</div>

            
            <p>This target checks the distribution. The basic idea is that it unpacks the

            
            distribution tarball and ensures that it can build. It takes the following

            
            actions:</p>

            
            <ol>

            
              <li>It depends on the <tt>dist-gzip</tt> target which, if it hasn't already

            
              been built, builds the gzip tar bundle (see dist and distdir above).</li>

            
              <li>removes any pre-existing <tt>_distcheckdir</tt> at the top level.</li>

            
              <li>creates a new <tt>_distcheckdir</tt> directory at the top level.</li>

            
              <li>creates a <tt>build</tt> subdirectory and an <tt>install</tt>

            
              subdirectory under <tt>_distcheckdir</tt>.</li>

            
              <li>unzips and untars the release tarball into <tt>_distcheckdir</tt>,

            
              creating <tt>LLVM-1.7</tt> directory (from the tarball).</li>

            
              <li>in the build subdirectory, it configures with appropriate options to build

            
              from the unpacked source tarball into the <tt>build</tt> directory with

            
              installation in the <tt>install</tt> directory.</li>

            
              <li>runs <tt>make all</tt></li>

            
              <li>runs <tt>make </tt><tt>check</tt></li>

            
              <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>

            
              <li>runs <tt>make dist-clean</tt></li>

            
            </ol>

            
            <p>If it can pass all that, the distribution will be deemed distribution

            
            worth y and you will see:<p>

            
            <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>

            
            <!-- ======================================================================= -->

            
            <div class="doc_subsection">dist-clean</div>

            
            <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>

            
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              <a href="mailto:rspencer@x10sys.com">Reid Spencer</a><br>

            
              <a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a>

            
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