
<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Then there's no concern for Darwin. Let's do it! <div class=""><br class=""><div class=""><div class="">-- adrian<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Jul 15, 2021, at 4:51 PM, Amy Huang <<a href="mailto:akhuang@google.com" class="">akhuang@google.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Yep, it would happen with -flimit-debug-info (-fno-standalone-debug) but won't affect -fstandalone-debug.<div class=""><br class=""></div><div class=""><br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jul 15, 2021 at 4:47 PM Adrian Prantl <<a href="mailto:aprantl@apple.com" class="">aprantl@apple.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;" class="">Thanks for letting us know. Is my understanding correct that "enabling by default" means when -flimit-debuginfo would be used, or would it also affect -fstandalone-debuginfo?<div class=""><br class=""></div><div class="">As always, please watch the <a href="https://green.lab.llvm.org/green/view/LLDB/job/lldb-cmake" target="_blank" class="">https://green.lab.llvm.org/green/view/LLDB/job/lldb-cmake</a> bot after making debug info changes.</div><div class=""><br class=""></div><div class="">thanks,</div><div class="">adrian</div><div class=""><div class=""><br class=""><blockquote type="cite" class=""><div class="">On Jul 15, 2021, at 11:14 AM, David Blaikie <<a href="mailto:dblaikie@gmail.com" target="_blank" class="">dblaikie@gmail.com</a>> wrote:</div><br class=""><div class=""><div dir="ltr" class="">Thanks Amy! + a few folks to highlight this.</div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jul 15, 2021 at 11:06 AM Amy Huang via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank" class="">llvm-dev@lists.llvm.org</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr" class=""><p style="margin:0px 0px 12px;padding:0px;border:0px;font-family:"Segoe UI","Segoe UI Emoji","Segoe UI Symbol",Lato,"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px" class="">A while back I tried turning on constructor homing (-debug-info-kind=constructor) by default in clang. Ctor homing is a debug info optimization that reduces the amount of debug info that is emitted for class types.</p><p style="margin:0px 0px 12px;padding:0px;border:0px;font-family:"Segoe UI","Segoe UI Emoji","Segoe UI Symbol",Lato,"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px" class="">The main blocker was that for some libc++ types we avoid calling the constructor. Since then I've added a attribute for classes that ignores ctor homing (`__attribute__((standlone_debug))`) and added it to the libc++ types (7c2f58278e66). <br class=""></p><p style="margin:0px 0px 12px;padding:0px;border:0px;font-family:"Segoe UI","Segoe UI Emoji","Segoe UI Symbol",Lato,"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px" class="">I think at this point we can try enabling it by default in Clang -- it's currently being used in chromium and google codebases. Thought I'd email the llvm-dev list in case people have thoughts/opinions/concerns about this. (patch is at <a href="https://reviews.llvm.org/D106084" target="_blank" class="">https://reviews.llvm.org/D106084</a>)<br class=""></p></div>

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