<div dir="ltr">As long as the target is supported, I think the difficulty of rolling a cross chain is overrated, but I've done lots of them and I remember when it wasn't relatively easy. I don't see their being harder at first as a reason to impede progress with the language which, keep in mind, we're actually writing the compiler in... as long as nobody suggests a total port to Delphi. ;-)<br></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature">GNOMETOYS<br></div></div>
<br><div class="gmail_quote">On Wed, Nov 1, 2017 at 11:24 AM, Zachary Turner via llvm-dev <span dir="ltr"><<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_quote"><span class=""><div dir="ltr">On Tue, Oct 31, 2017 at 11:23 PM Zachary Turner <<a href="mailto:zturner@google.com" target="_blank">zturner@google.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I’m ok with that, but the reason I’m pushing is because there is no clear plan of action. Even if the plan of action is “When X happens, we can enable C++14”, that’s fine too. I just want to know, concretely, what is X.<br><br>We should either be able to say never or give a reasonable set of conditions that would enable a switch. All I’ve seen though is “it’s hard” which just means I’m going to ask again next year, and the year after, etc due to lack of clear guidance.<br><br>To address your point though , this isn’t really about building everything with clang. You don’t need to bootstrap Clang to build a hypothetical C++17 enabled LLVM, you could also bootstrap a more modern version of GCC.<br><br>This is really more fundamentally about “Can we have a clearly defined policy about how often we can bump the minimum compiler version, like we have for MSVC?” </blockquote><div><br></div></span><div>To make this even more concrete, let me offer a proposal:</div><div><br></div><div>* We can bump the minimum required non-Microsoft toolchain version every 4 years.</div><div><br></div><div>Having something written like this allows us to have a schedule, and having a schedule allows downstream consumers to plan upgrades as needed so as to minimize disruption.</div><div><br></div><div>4 years is also a pretty reasonable amount of time IMO, but we can certainly discuss the exact value of N.</div><div><br></div><div>I haven't said anything here about what it can be bumped *to*. But in the interest of making progress, I'm separating the decisions out into smaller pieces so we can focus on one thing at a time.</div></div></div>
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