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<p>I have now observed that some of the object files, while compiled -flto=thin and determined to be missing the ThinLTOSummary and are being lumped into the "regularLTO" pass. This might explain some of my problem. Under what conditions would this summary
be missing? Is it ever legal to mix -flto and -flto=thin object files?</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Teresa Johnson <tejohnson@google.com><br>
<b>Sent:</b> Tuesday, May 16, 2017 9:52:47 AM<br>
<b>To:</b> David Blaikie<br>
<b>Cc:</b> David Callahan; LLVM Dev Mailing list<br>
<b>Subject:</b> Re: [llvm-dev] ThinLTO with Linux+ELF+Gold -- incorrectly dropping weak definitions.</font>
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<div dir="ltr">This looks similar to the problem I fixed awhile back in r<span style="font-size:12.8px">292408. I'll take a look (probably tomorrow since I am taking some vacation today).</span>
<div><span style="font-size:12.8px">Teresa</span></div>
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<div class="gmail_quote">On Tue, May 16, 2017 at 9:43 AM, David Blaikie <span dir="ltr">
<<a href="mailto:dblaikie@gmail.com" target="_blank">dblaikie@gmail.com</a>></span> wrote:<br>
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<div dir="ltr">+Teresa <br>
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<div dir="ltr">On Mon, May 15, 2017 at 9:20 AM David Callahan via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt">I am tracking a problem with ThinLTO on Linux using gold and elf files where there is a disconnect between gold’s treatment of comdat groups and ThinLTO’s decisions about which weak references to convert to
available externally. The net result is a definition is lost and a relocation entry is not handled.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">My status is summarized: <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__bugs.llvm.org_show-5Fbug.cgi-3Fid-3D32980&d=DwMFaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=lFyiPUrFdOHdaobP7i4hoA&m=DPiCkl9b6jP9-AMbNn0dugb9gFBlyNOKzRq3medq--c&s=DrEkmqUOt4bTaMEhOHPJpR7t5uuU7ux0362_rqDXoT4&e=" target="_blank">
https://bugs.llvm.org/show_<wbr>bug.cgi?id=32980</a> <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Anyone familiar with this space and have guidance? Either on how to avoid the problem, or a patch to correct it?
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thanks<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">--david<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
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Teresa Johnson |</td>
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Software Engineer |</td>
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