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| <h1 id="rust-langrust-licenses"><a class="header" href="#rust-langrust-licenses"><code>rust-lang/rust</code> Licenses</a></h1> |
| <p>The <code>rustc</code> compiler source and standard library are dual licensed under the <a href="https://github.com/rust-lang/rust/blob/master/LICENSE-APACHE">Apache License v2.0</a> and the <a href="https://github.com/rust-lang/rust/blob/master/LICENSE-MIT">MIT License</a> unless otherwise specified.</p> |
| <p>Detailed licensing information is available in the <a href="https://github.com/rust-lang/rust/blob/master/COPYRIGHT">COPYRIGHT document</a> of the <code>rust-lang/rust</code> repository.</p> |
| <h2 id="guidelines-for-reviewers"><a class="header" href="#guidelines-for-reviewers">Guidelines for reviewers</a></h2> |
| <p>In general, reviewers need to be looking not only for the code quality of contributions but also |
| that they are properly licensed. |
| We have some tips below for things to look out for when reviewing, but if you ever feel uncertain |
| as to whether some code might be properly licensed, err on the safe side — reach out to the Council |
| or Compiler Team Leads for feedback!</p> |
| <p>Things to watch out for:</p> |
| <ul> |
| <li>The PR author states that they copied, ported, or adapted the code from some other source.</li> |
| <li>There is a comment in the code pointing to a webpage or describing where the algorithm was taken |
| from.</li> |
| <li>The algorithm or code pattern seems like it was likely copied from somewhere else.</li> |
| <li>When adding new dependencies, double check the dependency's license.</li> |
| </ul> |
| <p>In all of these cases, we will want to check that source to make sure it is licensed in a way |
| that is compatible with Rust’s license.</p> |
| <p>Examples</p> |
| <ul> |
| <li>Porting C code from a GPL project, like GNU binutils, is not allowed. That would require Rust |
| itself to be licensed under the GPL.</li> |
| <li>Copying code from an algorithms text book may be allowed, but some algorithms are patented.</li> |
| </ul> |
| <h2 id="porting"><a class="header" href="#porting">Porting</a></h2> |
| <p>Contributions to rustc, especially around platform and compiler intrinsics, often include porting |
| over work from other projects, mainly LLVM and GCC.</p> |
| <p>Some general rules apply:</p> |
| <ul> |
| <li>Copying work needs to adhere to the original license |
| <ul> |
| <li>This applies to direct copy & paste</li> |
| <li>This also applies to code you looked at and ported</li> |
| </ul> |
| </li> |
| </ul> |
| <p>In general, taking inspiration from other codebases is fine, but please exercise caution when |
| porting code.</p> |
| <p>Ports of full libraries (e.g. C libraries shipped with LLVM) must keep the license of the original |
| library.</p> |
| |
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