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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>LLVM Developer Policy</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_warning">DRAFT Only. DRAFT Only. DRAFT Only. DRAFT Only.</div>
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<div class="doc_title">LLVM Developer Policy</div>
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<table class="layout"><tr class="layout"><td class="layout">
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<h2>Contents</h2>
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<ol>
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<li><a href="#introduction">Introduction</a></li>
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<li><a href="#general">General Policies</a>
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<ol>
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<li><a href="#informed">Stay Informed</a> </li>
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<li><a href="#newwork">Starting New Work</a></li>
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<li><a href="#reviews">Code Reviews</a></li>
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<li><a href="#incremental">Incremental Development</a></li>
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<li><a href="#quality">Quality</a></li>
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<li><a href="#testcases">Test Cases</a></li>
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</ol></li>
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<li><a href="#patches">Patch Policies</a>
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<ol>
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<li><a href="#p_form">Patch Form</a></li>
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<li><a href="#p_testing">Patch Testing</a></li>
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<li><a href="#p_submission">Patch Submission</a></li>
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<li><a href="#p_aftersub">After Submission</a></li>
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<li><a href="#p_aftercommit">After Commit</a></li>
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<li><a href="#c_access">Obtaining Commit Access</a></li>
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<li><a href="#c_new">New Committers</a></li>
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</ol></li>
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<li><a href="#candl">Copyright and License</a>
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<ol>
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<li><a href="#attribution">Attribution</a></li>
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<li><a href="#copyright">Copyright</a></li>
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<li><a href="#license">License</a></li>
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<li><a href="#devagree">Developer Agreements</a></li>
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</ol></li>
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<li><a href="#terms">Terminology</a></li>
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<li><a href="#polnotes">Policy Notes</a></li>
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</ol>
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<div class="doc_author">Written by LLVM Oversight Team</div>
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</td><td class="layout">
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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 contains the LLVM Developer Policy which defines the
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project's policy towards developers and their contributions. The intent of
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this policy is to eliminate mis-communication, rework, and confusion that
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might arise from the distributed nature of LLVM's development. By stating
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the policy in clear terms, we hope each developer can know ahead of time
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what to expect when making LLVM contributions.</p>
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<p>This policy is also designed to accomplish the following objectives:</p>
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<ol>
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<li>Attract both users and developers to the LLVM project.</li>
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<li>Make life as simple and easy for contributors as possible.</li>
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<li>Indicate that LLVM is a mature project with a thriving community and
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sensible policies directing its ongoing development.</li>
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</ol>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="general">General Policies</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>This section contains policies that pertain generally to LLVM developers.
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LLVM Developers are expected to meet the following obligations in order
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for LLVM to maintain a high standard of quality.<p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"> <a name="informed">Stay Informed</a> </div>
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<div class="doc_text">
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<p>Developers should stay informed by reading at least the
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<a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">llvmdev</a>
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email list. If you are doing anything more than just casual work on LLVM,
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it is suggested that you also subscribe to the
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<a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits">llvm-commits</a>
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list and pay attention to changes being made by others.</p>
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<p>We recommend that active developers register an email account with
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<a href="http://llvm.org/bugs/">LLVM Bugzilla</a> and preferably subscribe to
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the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmbugs">llvm-bugs</a>
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email list to keep track of bugs and enhancements occurring in LLVM.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"> <a name="newwork">Starting New Work</a></div>
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<div class="doc_text">
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<p>When a developer begins a major new project with the aim of contributing
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it back to LLVM, s/he should inform the community with an email to
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the <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">llvm-dev</a>
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email list, to the extent possible. The reason for this is to:
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<ul>
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<li>keep the community informed about future changes to LLVM, </li>
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<li>avoid duplication of effort by having multiple parties working on the
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same thing and not knowing about it, and</li>
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<li>ensure that any technical issues around the proposed work are
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discussed and resolved before any significant work is done.</li>
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</ul>
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<p>The design of LLVM is carefully controlled to ensure that all the pieces
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fit together well. If you plan to make a major change to the way LLVM works or
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a major new extension, it is a good idea to get consensus with the development
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community before you start working on it.</p>
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</div>
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</td></tr></table>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"> <a name="reviews">Code Reviews</a></div>
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<div class="doc_text">
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<p>LLVM has a code review policy. Code review is an excellent way to ensure
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high quality in the software. The following policies apply:</p>
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<ol>
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<li>All developers are required to have significant changes reviewed
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before they are committed to the repository.</li>
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<li>Code reviews are conducted by email.</li>
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<li>Code can be reviewed either before it is committed or after.</li>
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<li>The developer responsible for a code change is also responsible for
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making all necessary review changes.</li>
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<li>Developers should participate in code reviews as both a reviewer and
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a reviewee. We don't have a dedicated team of reviewers. If someone is
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kind enough to review your code, you should return the favor for someone
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else.</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="incremental">Incremental Development</a>
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</div>
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<div class="doc_text">
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<p>LLVM uses an incremental development style and all developers are expected
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to follow this practice. Incremental development is a big key to LLVM's
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success and it is essential that developers submit incremental patches. The
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following defines the incremental development approach:</p>
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<ol>
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<li>The first task is to define the increment and get consensus (with the
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LLVM development community) on what the end goal of the change is. Making
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random small changes that go nowhere is not useful for anyone.</li>
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<li>An increment is the smallest patch size necessary to effect one change
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in LLVM.</li>
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<li>Increments can be stand alone (e.g. to fix a bug), or part of a planned
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series of increments towards some development goal.</li>
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<li>Increments should be kept as small as possible. This simplifies your
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work (into a logical progression), simplifies code review and reduces the
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chance that you will get negative feedback on the change. Small increments
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also facilitate the maintenance of a high quality code base.</li>
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<li>Larger increments require a larger testing effort.</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="quality">Quality</a></div>
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<div class="doc_text">
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<p>The minimum quality standards for any change to the main development
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branch are:</p>
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<ol>
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<li>Code must adhere to the
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<a href="CodingStandards.html">LLVM Coding Standards</a>.</li>
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<li>Code must compile cleanly (no errors, no warnings) on at least one
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platform.</li>
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<li>Code must pass the deja gnu (llvm/test) test suite.</li>
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</ol>
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<p>Additionally, the committer is responsible for addressing all of the
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following items (preferably before submission):</p>
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<ol>
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<li>The code should compile cleanly on all platforms.</li>
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<li>The changes should not cause regressions in the <tt>llvm-test</tt>
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suite including SPEC CINT2000, SPEC CFP2000, SPEC CINT2006, and
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SPEC CFP2006.</li>
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<li>The change set should not cause performance or correctness regressions
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for the LLVM tools.</li>
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<li>The changes should not cause performance or correctness regressions in
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code compiled by LLVM on all applicable targets.</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="testcases">Test Cases</a></div>
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<div class="doc_text">
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<p>Developers are required to create test cases for regressions and new
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features and include them with their changes. The following policies
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apply:</p>
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<ol>
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<li>All feature and regression test cases must be added to the
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<tt>llvm/test</tt> directory. The appropriate sub-directory should be
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selected (see the <a href="TestingGuide.html">Testing Guide</a> for
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details).</li>
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<li>Test cases should be written in
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<a href="LangRef.html">LLVM assembly language</a> unless the
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feature or regression being tested requires another language (e.g. the
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bug being fixed or feature being implemented is in the lvm-gcc C++
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front-end).</li>
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<li>Test cases, especially for regressions, should be reduced as much as
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possible, by <a href="CommandGuide/html/bugpoint.html">bugpoint</a> or
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manually. It is unacceptable
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to place an entire failing program into <tt>llvm/test</tt> as this creates
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a <i>time-to-test</i> burden on all developers. Please keep them short.</li>
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<li>More extensive test cases (applications, benchmarks, etc.) should be
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added to the <tt>llvm-test</tt> test suite. This test suite is for
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coverage not features or regressions.</li>
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</ol>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="patches">Patch Policies</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>This section contains policies that pertain to submitting patches
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to LLVM and committing code to the repository</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"> <a name="p_form">Patch Form</a></div>
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<div class="doc_text">
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<p>When submitting a patch, developers must follow these rules:</p>
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<ol>
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<li>Patches must be made against the CVS HEAD (main development trunk),
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not a branch.</li>
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<li>Patches should be made with this command:<pre>
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cvs diff -Ntdup -5</pre> or with the utility <tt>utils/mkpatch</tt>.</li>
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<li>Patches should not include differences in generated code such as the
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code generated by <tt>flex</tt>, <tt>bison</tt> or <tt>tblgen</tt>. The
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<tt>utils/mkpatch</tt> utility takes care of this for you.</li>
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<li>Patches must not include any patent violations. To the best of our
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knowledge, LLVM is free of any existing patent violations and it is our
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intent to keep it that way. </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="p_testing">Patch Testing</a></div>
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<div class="doc_text">
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<p>Before a patch is submitted for review, it should be tested to ensure
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that:</p>
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<ol>
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<li>The patch must compile against the CVS HEAD cleanly (zero warnings, zero
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errors).</li>
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<li>All the llvm/test (Deja Gnu) tests must pass.</li>
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<li>The patch should cause no regressions in the llvm-test test suite. How
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much testing is appropriate depends on the nature of the patch. We leave it
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to your good judgement, but you will be responsible for fixing any
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regressions or reverting the patch.</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="p_submission">Patch Submission</a></div>
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<div class="doc_text">
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<p>When a patch is ready to be submitted, these policies apply:</p>
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<ol>
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<li>Patches should be submitted immediately after they are generated. Stale
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patches may not apply correctly if the underlying code changes between the
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time the patch was created and the time it is applied.</li>
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<li>Patches should be submitted by e-mail to the
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<a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits">
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llvm-commits</a> list.</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="p_aftersub">After Submission</a></div>
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<div class="doc_text">
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<p>After a patch has been submitted, these policies apply:</p>
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<ol>
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<li>The patch is subject to review by anyone on the
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<a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits">llvm-commits</a>
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email list.</li>
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<li>Changes recommended by a reviewer should be incorporated into your
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patch or you should explain why the reviewer is incorrect.
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<li>Changes to the patch must be re-submitted to the
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<a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits">llvm-commits</a>
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email list.</li>
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<li>This process iterates until all review issues have been addressed.</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="p_aftercommit">After Commit</a></div>
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<div class="doc_text">
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<p>After a patch has been committed, these policies apply:</p>
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<ol>
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<li>The patch is subject to further review by anyone on the llvm-commits
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email list.</li>
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<li>The patch submitter is responsible for all aspects of the patch per
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the <a href="quality">quality policy</a> above.</li>
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<li>If the patch is discovered to not meet the
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<a href="quality">quality policy</a> standards within a reasonable time
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frame (24 hours), it may be subject to reversal.</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="c_access">Obtaining Commit Access</a></div>
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<div class="doc_text">
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<p>Commit access to the repository is granted according to this policy:</p>
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<ol>
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<li>Commit access is not granted to anyone unless they specifically ask for
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it.</li>
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<li>Requests for commit access must be sent to the
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<a href="mailto:llvm-oversight@cs.uiuc.edu">LLVM Oversight Group</a>.</li>
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<li>Granting commit access is at the sole discretion of the LLVM Oversight
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Group.</li>
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</ol>
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<p>Submitting patches to LLVM via the patch policy above will greatly
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increase the chance that your request for commit access is granted. Getting
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to know the members of the LLVM community (email, IRC, in person contact,
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etc.) will also increase your chances.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"> <a name="c_new">New Committers</a></div>
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<div class="doc_text">
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<p>For those who have recently obtained commit access, the following policies
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apply:</p>
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<ol>
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<li>You are granted <i>commit-after-approval</i> to all parts of LLVM.
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To get approval, submit a patch to
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<a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits">llvm-commits</a>
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per the <a href="#patches">patch policies</a> above. When approved you
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may commit it yourself.</li>
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<li>You are allowed to commit patches without approval which you think are
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obvious. This is clearly a subjective decision. We simply expect you to
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use good judgement.</li>
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<li>You are allowed to commit patches without approval to those portions
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of LLVM that you own (contributed) or maintain (have been assigned
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responsibility for), with the proviso that such commits must not break the
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build. This is a "trust but verify" policy and commits of this nature are
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reviewed after they are committed.</li>
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<li>Commits that violate the <a href="quality">quality standards</a> may
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be reverted. This is necessary when the change blocks other developers from
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making progress. The developer is welcome to re-commit the change after
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the problem has been fixed.</li>
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<li>Multiple violations of these policies or a single egregious violation
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may cause commit access to be revoked.</li>
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</ol>
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</div>
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<!--=========================================================================-->
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<div class="doc_section"><a name="candl">Copyright and License</a></div>
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<!--=========================================================================-->
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<div class="doc_text">
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<p>We address here the issues of copyright and license for the LLVM project.
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The object of the copyright and license is the LLVM source code and
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documentation.
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Currently, the University of Illinois is the LLVM copyright holder and the
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terms of its license to LLVM users and developers is the
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<a href="http://www.opensource.org/licenses/UoI-NCSA.php">University of
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Illinois/NCSA Open Source License</a>.
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</div>
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<div class="doc_notes">
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<p>NOTE: This section deals with legal matters but does not provide legal
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advice. It is intended only as a general guideline.</p>
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</div>
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<!-- _______________________________________________________________________ -->
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<div class="doc_subsection"><a name="attribution">Attribution</a></div>
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<div class="doc_text">
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<p>The LLVM project believes in correct attribution of contributions to
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their contributors, as follows:</p>
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<ol>
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<li>Developers who originate new files in LLVM should place their name at
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the top of the file per the
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<a href="CodingStandards.html">Coding Standards</a>.</li>
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<li>There should be only one name at the top of the file and it should be
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the person who created the file.</li>
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<li>Placing your name in the file does not imply copyright but does
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correctly attribute the file to its author.</li>
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<li>Developers should be aware that after some time has passed, the name at
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the top of a file may become meaningless as maintenance/ownership of files
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changes.</li>
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<li>Developers should submit or commit patches to the
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<a href="http://llvm.org/cvsweb/cvsweb.cgi/llvm/CREDITS.TXT?rev=1.67&content-type=text/x-cvsweb-markup">CREDITS.txt</a>
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file to summarize their contributions.</li>
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<li>Commit comments should contain correct attribution of the person who
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submitted the patch if that person is not the committer (i.e. when a
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developer with commit privileges commits a patch for someone else).</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="copyright">Copyright</a></div>
|
|
<div class="doc_text">
|
|
<p>
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<p>For consistency and ease of management, the project requires the
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copyright for all LLVM software to be held by a single copyright holder.
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Although UIUC may assign the copyright of the software to another entity,
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the intent for the project is to always have a single entity hold the copy
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rights to LLVM at any given time.
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<p>Having multiple copyright holders for various portions of LLVM is
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problematic in the management of the software. Having a single copyright
|
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holder is in the best interests of all developers and users as it greatly
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reduces the managerial burden for any kind of administrative or technical
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decisions about LLVM.</p>
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</div>
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<!-- _______________________________________________________________________ -->
|
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<div class="doc_subsection"><a name="license">License</a></div>
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<div class="doc_text">
|
|
<p>LLVM licensing decisions will be made by the LLVM Oversight Group. Any
|
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issues, comments or suggestions with the licensing should be sent to the
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<a href="mailto:llvm-oversight@cs.uiuc.edu">LLVM Oversight Group</a>.</p>
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<p>The LLVM Oversight Group intends to keep LLVM perpetually open source
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and to use liberal open source licenses. The current license is the
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|
<a href="http://www.opensource.org/licenses/UoI-NCSA.php">
|
|
University of Illinois/NCSA Open Source License</a>, which boils
|
|
down to this:</p>
|
|
<ul>
|
|
<li>You can freely distribute LLVM.</li>
|
|
<li>You must retain the copyright notice if you redistribute LLVM.</li>
|
|
<li>Binaries derived from LLVM must reproduce the copyright notice.</li>
|
|
<li>You can't use our names to promote your LLVM derived products.</li>
|
|
<li>There's no warranty on LLVM at all.</li>
|
|
</ul>
|
|
<p>We believe this fosters the widest adoption of LLVM because it allows
|
|
commercial products to be derived from LLVM with few restrictions and
|
|
without a requirement for making any derived works also open source (i.e.
|
|
LLVM's license is not a <i>copyleft</i> license). We suggest that you read
|
|
the <a href="http://www.opensource.org/licenses/UoI-NCSA.php">License</a>
|
|
if further clarification is needed.</p>
|
|
</div>
|
|
<!-- _______________________________________________________________________ -->
|
|
<div class="doc_subsection"><a name="devagree">Developer Agreements</a></div>
|
|
<div class="doc_text">
|
|
<p>With regards to the LLVM copyright and licensing, developers agree to:</p>
|
|
<ul>
|
|
<li>assign their copy rights to UIUC for any contribution made so that
|
|
the entire software base can be managed by a single copyright holder.</li>
|
|
<li>allow their contribution(s) to be licensed as open source by the then
|
|
current license chosen by the LLVM Oversight Group.</li>
|
|
</ul>
|
|
</div>
|
|
|
|
<!--=========================================================================-->
|
|
<div class="doc_section"><a name="terms">Terminology</a></div>
|
|
<!--=========================================================================-->
|
|
<div class="doc_text">
|
|
<p>So that the policies defined in this document are clear, we define some
|
|
terms here.</p>
|
|
<dl>
|
|
<dt><a name="t_change">Change</a></dt>
|
|
<dd>Any modification to LLVM including documentation, tests, build system,
|
|
etc. either in <a href="#t_patch">patch</a> or
|
|
<a href="#t_commit">commit</a> form.</dd>
|
|
<dt><a name="t_commit">Commit</a><dt>
|
|
<dd>A <a href="t_change">change</a> submitted directly to LLVM software
|
|
repository via the <tt>cvs commit</tt> command.</dd>
|
|
<dt><a name="t_copleft">Copyleft</a></dt>
|
|
<dd>A licensing policy that requires the licensee to adopt the terms of the
|
|
license for <i>derived</i> works. LLVM does not subscribe to this
|
|
policy.</dd>
|
|
<dt><a name="t_developer">Developer</a></dt>
|
|
<dd>Anyone who submits a <a href="#t_change">change</a> to LLVM.</dd>
|
|
<dt><a name="t_inrement">Increment</a></dt>
|
|
<dd>A <a href="#t_change">change</a> or set of changes, whether by
|
|
<a href="#t_patch">patch</a> or <a href="#t_commit">commit</a>, that are
|
|
related by a single common purpose. Increments are atomic as they
|
|
leave LLVM in a stable state (both compiling and working properly).</dd>
|
|
<dt><a name="t_must">Must</a></dt>
|
|
<dd>When used in a policy statement, the term <i>must</i> implies a
|
|
non-optional requirement on the developer.</dd>
|
|
<dt><a name="t_patch">Patch</a></dt>
|
|
<dd>A <a href="#t_change">change</a> submitted by email in patch (diff)
|
|
format generated by the <tt>cvs diff</tt> command.</dd>
|
|
<dt><a name="t_should">Should</a></dt>
|
|
<dd>When used in a policy statement, the term <i>should</i> implies a
|
|
recommended but optional requirement on the developer.</dd>
|
|
</dl>
|
|
</div>
|
|
|
|
<!--=========================================================================-->
|
|
<div class="doc_section"><a name="polnotes">Policy Notes</a></div>
|
|
<!--=========================================================================-->
|
|
<div class="doc_text">
|
|
<p>This section contains some notes on policy topics that need to be
|
|
resolved and incorporated into the main body of the document above.</p>
|
|
<ol>
|
|
<li>When to open a new bug and when to re-use an existing one. For example
|
|
PR1158. If the same assertion happens do you open a new bug or reopen
|
|
1158?</li>
|
|
</ol>
|
|
</div>
|
|
|
|
<!-- *********************************************************************** -->
|
|
<hr>
|
|
<address>
|
|
<a href="http://jigsaw.w3.org/css-validator/check/referer"><img
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src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
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src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" /></a>
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Written By: the
|
|
<a href="mailto:llvm-oversight@cs.uiuc.edu">LLVM Oversight Group</a><br>
|
|
<a href="http://llvm.org">The LLVM Compiler Infrastructure</a><br>
|
|
Last modified: $Date$
|
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</address>
|
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</body>
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</html>
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