<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman",serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks for the update Zachary!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I indeed missed the LLVM-Dev meeting, so this is a welcome bit of news for me!
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I’m glad we decided to go with the cmake-warning mechanism. Was there ever any discussion about a rolling warning system as I proposed here?
<a href="https://reviews.llvm.org/D47073">https://reviews.llvm.org/D47073</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">It had received positive feedback on the mailing list, though Chandler had/has some reservations. IMO, it is a way of going about this that prevents this discussion
from being so contentious in the future.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">-Erich<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></a></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> cfe-dev [mailto:cfe-dev-bounces@lists.llvm.org]
<b>On Behalf Of </b>Zachary Turner via cfe-dev<br>
<b>Sent:</b> Friday, October 19, 2018 9:58 AM<br>
<b>To:</b> llvm-dev <llvm-dev@lists.llvm.org>; Clang Dev <cfe-dev@lists.llvm.org><br>
<b>Subject:</b> [cfe-dev] LLVM C++14/C++17 BoF - Summary<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">For those of you who were not able to attend the LLVM Developer Meeting (and as a recap for those who were), we had a productive BoF about enabling C++14 or C++17 in LLVM. The outcome of this can be generally summarized as:<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">* There were no major objections to moving to C++14 / C++17 "as soon as possible"<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">* "As soon as possible" is not immediately, but we are currently targeting March of 2019 due to some downstream contributors' needing to resolve some blockages before it can be possible.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">* There did not seem to be a strong sentiment that we should only move to C++14, so for the sake of this discussion we're assuming 17 unless someone presents a strong argument why 17 is *less* desirable than 14.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Minimum Compiler Versions for "Reasonable C++17 Support" (Mostly everything minus CTAD)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">GCC - Version 7 [1] (Version 8 for CTAD)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Clang - Version 4 [2] (Version 5 for CTAD)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">MSVC - 2017 Update 5 [3] (Update 7 for CTAD)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">We plan to add a CMake warning if your compiler version is below these versions soon. Around January, we will promote this to a CMake error which you must manually override by passing -DCMAKE_ALLLOW_DEPRECATED_COMPILER.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">If I'm forgetting anything or misrepresenting anything that was said at the BoF please feel free to correct me.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">[1] - <a href="https://www.gnu.org/software/gcc/projects/cxx-status.html">https://www.gnu.org/software/gcc/projects/cxx-status.html</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">[2] - <a href="https://clang.llvm.org/cxx_status.html">https://clang.llvm.org/cxx_status.html</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">[3] - <a href="https://docs.microsoft.com/en-us/cpp/visual-cpp-language-conformance?view=vs-2017">https://docs.microsoft.com/en-us/cpp/visual-cpp-language-conformance?view=vs-2017</a><o:p></o:p></p>
</div>
</div>
</div>
</body>
</html>