<div dir="ltr"><div dir="ltr">Ninja makes subprocesses write to a pipe and prints their output preceded by the [N/M] line before printing their output the process is done, to not get interleaving output from parallel processes and to make it easy to see which process a given output belongs to. So link.exe definitely prints this line twice.<br></div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Nov 20, 2018 at 9:28 AM <<a href="mailto:paul.robinson@sony.com">paul.robinson@sony.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">(resend to the list)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">And of course, just as I say that, my next ninja build shows the line only once.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">On reflection I am less sure that the lack of a [N/M] line means they are from the same invocation. Surely ninja could spawn two links, which then independently
report "Creating library" after ninja emits the [N/M] lines.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">--paulr<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><a name="m_5238897006417232255__MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></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""> llvm-dev [mailto:<a href="mailto:llvm-dev-bounces@lists.llvm.org" target="_blank">llvm-dev-bounces@lists.llvm.org</a>]
<b>On Behalf Of </b>via llvm-dev<br>
<b>Sent:</b> Tuesday, November 20, 2018 9:01 AM<br>
<b>To:</b> <a href="mailto:thakis@chromium.org" target="_blank">thakis@chromium.org</a><br>
<b>Cc:</b> <a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a><br>
<b>Subject:</b> Re: [llvm-dev] Ninja build (on Windows anyway) may be doing redundant work<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">OK, worth knowing. Thanks.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">--paulr<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></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""> Nico Weber [mailto:<a href="mailto:thakis@chromium.org" target="_blank">thakis@chromium.org</a>]
<br>
<b>Sent:</b> Monday, November 19, 2018 7:11 PM<br>
<b>To:</b> Robinson, Paul<br>
<b>Cc:</b> Zachary Turner; llvm-dev<br>
<b>Subject:</b> Re: [llvm-dev] Ninja build (on Windows anyway) may be doing redundant work<u></u><u></u></span></p>
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<p class="MsoNormal">Since there's no "[2663/3121] " line between the two messages, the two lines are from the same link.exe invocation. I don't know why link.exe thinks it needs to print this line twice, ninja doesn't have anything to do with it.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Mon, Nov 19, 2018 at 6:57 PM <<a href="mailto:paul.robinson@sony.com" target="_blank">paul.robinson@sony.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I'm more concerned about seeing the message come out twice, which implies Ninja is executing a rule
twice when it doesn't need to.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">--paulr</span><u></u><u></u></p>
<p class="MsoNormal"><a name="m_5238897006417232255_m_-7920501117573442540__MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></a><u></u><u></u></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""> Nico Weber [mailto:<a href="mailto:thakis@chromium.org" target="_blank">thakis@chromium.org</a>]
<br>
<b>Sent:</b> Monday, November 19, 2018 6:09 PM<br>
<b>To:</b> Zachary Turner<br>
<b>Cc:</b> Robinson, Paul; llvm-dev<br>
<b>Subject:</b> Re: [llvm-dev] Ninja build (on Windows anyway) may be doing redundant work</span><u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">Do you still see this if you use lld-link for linking?<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">The "corrupt obj file" is something we saw on chrome's bots every now and then before we switched to lld.<u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p>
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<p class="MsoNormal">On Mon, Nov 19, 2018 at 5:27 PM Zachary Turner <<a href="mailto:zturner@google.com" target="_blank">zturner@google.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><a href="mailto:thakis@google.com" id="m_5238897006417232255m_-7920501117573442540m_-7276686908134016340IloFPc-2" target="_blank">+Nico Weber</a> <u></u><u></u></p>
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<p class="MsoNormal">On Mon, Nov 19, 2018 at 12:25 PM via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">This afternoon I did a clean build of llvm using ninja and MSVC 2015 on<br>
Windows 10. I saw something curious and wondered if any of the ninja or<br>
CMake experts out there can explain/fix it.<br>
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[2663/3121] Linking CXX shared library bin\LTO.dll<br>
Creating library lib\LTO.dll and object lib\LTO.exp<br>
Creating library lib\LTO.dll and object lib\LTO.exp<br>
[3120/3121] Running the LLVM regression tests<br>
[[[ etc ]]]<br>
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I'm curious about the "creating library" message popping out twice.<br>
Sometimes ninja builds will die on me, complaining about a corrupted<br>
object file, usually related to LTO. Rerunning ninja usually completes<br>
successfully. So I wonder if there's some mishap in the dependencies<br>
somewhere that actually causes the build to try to link the DLL twice,<br>
which of course might corrupt a file if the links are overlapping in<br>
time.<br>
<br>
Thought I'd throw this out there in case someone wants to take a look.<br>
--paulr<br>
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