<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;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.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" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal">The default DWARF version is target-dependent, it’s a hook in ToolChain.h (GetDefaultDwarfVersion). In the base class this returns 4; Darwin currently picks 2 for OS X 10.10 / iOS 8 or previous, and 4 otherwise.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Some targets already pick 5. It’s the ones that don’t explicitly pick that would be affected, of course. PS4 among them, of course, but I think we know what to do about it.
<span style="font-family:"Segoe UI Emoji",sans-serif">😊</span><o:p></o:p></p>
<p class="MsoNormal">--paulr<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt">
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> David Blaikie <dblaikie@gmail.com> <br>
<b>Sent:</b> Thursday, November 4, 2021 6:06 PM<br>
<b>To:</b> Adrian Prantl <aprantl@apple.com><br>
<b>Cc:</b> Jonas Devlieghere <jdevlieghere@apple.com>; Robinson, Paul <paul.robinson@sony.com>; James Henderson <jh7370.2008@my.bristol.ac.uk>; Clang Dev <cfe-dev@lists.llvm.org><br>
<b>Subject:</b> Re: DWARFv5 by default in clang?<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On Thu, Nov 4, 2021 at 3:01 PM Adrian Prantl <<a href="mailto:aprantl@apple.com">aprantl@apple.com</a>> wrote:<o:p></o:p></p>
</div>
<div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<p class="MsoNormal">On Darwin, we still have a sizeable number of test failures to go until we're there: <a href="https://urldefense.com/v3/__https:/green.lab.llvm.org/green/view/LLDB/job/lldb-cmake-matrix/__;!!JmoZiZGBv3RvKRSx!rlnO92bXtV-KwQx2jCwIIqoKrdlZbt7P9csZLDaGq7tZ3YCJ1IN2S1nrALGLW9FybQ$" target="_blank">https://green.lab.llvm.org/green/view/LLDB/job/lldb-cmake-matrix/</a><o:p></o:p></p>
</div>
</blockquote>
<div>
<p class="MsoNormal"><br>
I'm not sure what/where/how to read that - could you give me some pointers?<br>
<br>
In any case, as I recall, Darwin had a different default for quite a while after we switched the default on other platforms to v4, so I guess we could do the same thing for v5.<br>
<o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">-- adrian<o:p></o:p></p>
</div>
<div>
<div>
<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Am 11/4/21 um 2:58 PM schrieb David Blaikie <<a href="mailto:dblaikie@gmail.com" target="_blank">dblaikie@gmail.com</a>>:<o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">Should we change Clang's default to DWARFv5?<br>
<br>
(I'm motivated by having fixed a bug because I only tested with v4 - I should've tested with v5, but got me thinking about maybe v5 is just a better default at this point)<br>
<br>
Google's been using v5 as the default for the better part of a year at this point - not the most debugger usage, but we validated GDB and LLDB for v5 pretty well & haven't encountered major issues since the switch.<o:p></o:p></p>
</div>
</div>
</blockquote>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</body>
</html>