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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Sylvestre Ledru reports that changing the default to C++11 or C++14 "would fix more than 70 issues" in building Debian with Clang. See the "[cfe-dev] Using
5.0rc2 to rebuild Debian" thread.<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's clearly too late to make a change like this for 5.0. Is there any remaining roadblock to making the change for 6.0 (trunk)?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">--paulr<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>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Martin J. O'Riordan [mailto:martin.oriordan@movidius.com]
<br>
<b>Sent:</b> Sunday, May 21, 2017 1:09 PM<br>
<b>To:</b> 'Richard Smith'<br>
<b>Cc:</b> Robinson, Paul; 'clang developer list'<br>
<b>Subject:</b> RE: [cfe-dev] Setting default dialect to C++11<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:#943634">Thanks Richard,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:#943634"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:#943634">Any chance the “</span><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:black">Subject</span><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:#943634">”
could change to “</span><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:black">RE: [cfe-dev] Setting default dialect to
<span style="background:yellow;mso-highlight:yellow">C++14</span></span><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:#943634">”, simply to make it clear what is being discussed (I didn’t want to pre-emptively make such a change since I
don’t own the discussion)? I’m quite happy with the default being C++14, and for that matter, soon defaulting to C++17, but the discussion should be clear and unambiguous - IMO defaulting to tracking the current Standard is the better choice, with ‘</span><span lang="EN-IE" style="font-family:"Courier New";color:black">-std=</span><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:#943634">’
being used to specify an earlier Standard, or a proposed and experimental future standard.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:#943634"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:#943634"> MartinO<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:#943634"><o:p> </o:p></span></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"">
<a href="mailto:metafoo@gmail.com">metafoo@gmail.com</a> [<a href="mailto:metafoo@gmail.com">mailto:metafoo@gmail.com</a>]
<b>On Behalf Of </b>Richard Smith<br>
<b>Sent:</b> 21 May 2017 20:23<br>
<b>To:</b> Martin J. O'Riordan <<a href="mailto:martin.oriordan@movidius.com">martin.oriordan@movidius.com</a>><br>
<b>Cc:</b> Robinson, Paul <<a href="mailto:paul.robinson@sony.com">paul.robinson@sony.com</a>>; clang developer list <<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>><br>
<b>Subject:</b> Re: [cfe-dev] Setting default dialect to C++11<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-IE">The proposal is to go straight to C++14. That both matches GCC's current default and the suggested policy of setting the default to the most recent published standard for which we have sufficiently mature support.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-IE"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-IE">On 21 May 2017 at 03:54, Martin J. O'Riordan <<a href="mailto:martin.oriordan@movidius.com" target="_blank">martin.oriordan@movidius.com</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:black">From the “Subject” and earlier messages in this thread, it would appear that the proposed default Standard
is C++11; but the words in this message and a few other messages seem to suggest that the proposed default Standard is C++14.</span><span lang="EN-IE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:black"> </span><span lang="EN-IE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:black">I’m just curious about the proposed default, is it to be C++11 or C++14? I don’t have any argument against
changing the default to either, but would like to know what is really being proposed.</span><span lang="EN-IE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:black"> </span><span lang="EN-IE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:black">Thanks,</span><span lang="EN-IE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:black"> </span><span lang="EN-IE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:black"> MartinO</span><span lang="EN-IE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-IE" style="font-family:"Book Antiqua","serif";color:#943634"> </span><span lang="EN-IE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><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:<a href="mailto:cfe-dev-bounces@lists.llvm.org" target="_blank">cfe-dev-bounces@lists.llvm.org</a>]
<b>On Behalf Of </b>Richard Smith via cfe-dev<br>
<b>Sent:</b> 19 May 2017 18:12<br>
<b>To:</b> Robinson, Paul <<a href="mailto:paul.robinson@sony.com" target="_blank">paul.robinson@sony.com</a>><br>
<b>Cc:</b> Clang Dev <<a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a>><br>
<b>Subject:</b> Re: [cfe-dev] Setting default dialect to C++11</span><span lang="EN-IE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-IE"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-IE">On 18 May 2017 11:18 pm, "Robinson, Paul" <<a href="mailto:paul.robinson@sony.com" target="_blank">paul.robinson@sony.com</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Not to forget that Charles Li did a pile of work over the past year or so to tidy up a lot of the
tests. Given that the PS4 target already defaults to C++11, I should hope there would be little left to do.</span><span lang="EN-IE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-IE">Right, and indeed we have buildbots that test that a C++11 default works. So the remaining cleanups would be for C++14-specific issues, which should be minimal
in comparison to the great work Charles did.<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">--paulr</span><span lang="EN-IE"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a name="m_-8802588362637809690_m_979466430111428"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span></a><span lang="EN-IE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> cfe-dev [mailto:<a href="mailto:cfe-dev-bounces@lists.llvm.org" target="_blank">cfe-dev-bounces@lists.llvm.org</a>]
<b>On Behalf Of </b>Richard Smith via cfe-dev<br>
<b>Sent:</b> Thursday, May 18, 2017 8:30 PM<br>
<b>To:</b> Tim Northover<br>
<b>Cc:</b> <a href="mailto:cfe-dev@lists.llvm.org" target="_blank">cfe-dev@lists.llvm.org</a></span><span lang="EN-IE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><br>
<b>Subject:</b> Re: [cfe-dev] Setting default dialect to C++11<span lang="EN-IE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <span lang="EN-IE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On 18 May 2017 at 19:38, Tim Northover <<a href="mailto:t.p.northover@gmail.com" target="_blank">t.p.northover@gmail.com</a>> wrote:<span lang="EN-IE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On 18 May 2017 at 18:56, Richard Smith <<a href="mailto:richard@metafoo.co.uk" target="_blank">richard@metafoo.co.uk</a>> wrote:<br>
> Agreed. I think there's sufficient (although not unanimous) agreement that<br>
> we should increase our default language standard; what we need is for<br>
> someone to work through the immediate fallout from doing so (particularly in<br>
> the test suite).<br>
<br>
I'll see what I can do tomorrow. Hopefully I can at least get some<br>
numbers here by the end of the day. Possibly patches; what's our<br>
preferred solution to failures: fix the code (within reason), or<br>
-std=c++98?<span lang="EN-IE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <span lang="EN-IE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">If the difference is interesting, test it in both modes. If the test is C++98-specific or has uninteresting diagnostic differences, -std=c++98.<span lang="EN-IE"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-IE"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-IE"><o:p> </o:p></span></p>
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