
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hey everyone,<div class=""><br class=""></div><div class="">Xcode 9 shipped with index-while-building functionality based on enhancements to Clang that we’d like to upstream. Key among them is a new option, <font face="Menlo" class="">-index-store-path</font>, that in addition to Clang's usual outputs, causes it to write out indexing data at the supplied path with minimal overhead.</div><div class=""><br class=""></div><div class="">While the current implementation is available at <a href="https://github.com/apple/swift-clang" class="">https://github.com/apple/swift-clang</a>, we’d like to start by getting feedback on the high-level design, which you can read about here: <a href="https://docs.google.com/document/d/1cH2sTpgSnJZCkZtJl1aY-rzy4uGPcrI-6RrUpdATO2Q/edit?usp=sharing" class="">https://docs.google.com/document/d/1cH2sTpgSnJZCkZtJl1aY-rzy4uGPcrI-6RrUpdATO2Q/edit?usp=sharing</a></div><div class=""><br class=""></div><div class="">Please let us know of any concerns, comments or questions you have regarding this feature.</div><div class=""><br class=""></div><div class="">Thanks!</div><div class="">Nathan</div></body></html>