<div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr">Mystery solved - the short answer is to add "-Xclang -fno-lto-unit" to your compile steps (-c -flto=thin). I had forgotten that we add this for our internal distributed builds. Another option would be to add "-Wl,-plugin-opt,obj-path=astar.o" to the thin link step, and add the resulting (native) astar.o file to the final link.</div><div dir="ltr"><br></div><div>I am working on getting the default changed (D53890/D53891), since this is only needed for CFI [1], but currently by default each module is split into two - a regular LTO module containing vtable defs and a thin LTO module containing the rest. This is required by CFI so that the vtables can be globally laid out via regular LTO. If you don't disable this splitting (via "-Xclang -fno-lto-unit"), then you need to capture the result of this regular LTO portion via the obj-path plugin option and link it as well. However, unless you plan to do CFI this is just giving your builds extra unnecessary overhead (which is why the default will change).</div><div><br></div><div> [1] Also currently for whole program devirtualization which is enabled for CFI, or separately via options - although I have a patch out for review to do WPD with ThinLTO alone (D55153).<br></div><div><br></div><div>Teresa</div></div></div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Jan 8, 2019 at 5:28 PM Teresa Johnson <<a href="mailto:tejohnson@google.com" target="_blank">tejohnson@google.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Ok thanks for checking. I'll try to repro tomorrow morning probably and get back. Teresa<br><br><div class="gmail_quote"><div dir="ltr">On Tue, Jan 8, 2019, 5:03 PM David Callahan <<a href="mailto:dcallahan@fb.com" target="_blank">dcallahan@fb.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" id="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009gmail_block_quote0">
<div lang="EN-US">
<div class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132WordSection1">
<p class="MsoNormal">Fails with gold too:<u></u><u></u></p>
<p class="MsoNormal">Library-native.o:Library.cpp:regway: error: undefined reference to 'vtable for regwayobj'<u></u><u></u></p>
<p class="MsoNormal">/home/dcallahan/fbsource/fbcode/third-party-buck/platform007/tools/binutils/bin/gold/ld: the vtable symbol may be undefined because the class is missing its key function<u></u><u></u></p>
<p class="MsoNormal">clang-8: error: linker command failed with exit code 1 (use -v to see invocation)<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(181,196,223);padding:3pt 0in 0in">
<p class="MsoNormal"><b><span style="font-size:12pt;color:black">From: </span></b><span style="font-size:12pt;color:black">Teresa Johnson <<a href="mailto:tejohnson@google.com" target="_blank">tejohnson@google.com</a>><br>
<b>Date: </b>Tuesday, January 8, 2019 at 4:57 PM</span></p></div></div></div><div lang="EN-US"><div class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132WordSection1"><div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(181,196,223);padding:3pt 0in 0in"><p class="MsoNormal"><span style="font-size:12pt;color:black"><br>
<b>To: </b>David Callahan <<a href="mailto:dcallahan@fb.com" target="_blank">dcallahan@fb.com</a>><br>
<b>Cc: </b>LLVM Dev Mailing list <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>><br>
<b>Subject: </b>Re: [llvm-dev] distributed thinlto usage<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div>
<p class="MsoNormal">On Tue, Jan 8, 2019 at 4:36 PM David Callahan <<a href="mailto:dcallahan@fb.com" target="_blank">dcallahan@fb.com</a>> wrote:<u></u><u></u></p>
</div>
<blockquote style="border-top:none;border-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in">
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<div>
<p class="MsoNormal">Thanks Teresa<u></u><u></u></p>
<p class="MsoNormal">Yes it is astar, happen to send a tar of the sources but they are just copies from the spec distribution<u></u><u></u></p>
<p class="MsoNormal">The ld command is:<u></u><u></u></p>
<p class="MsoNormal">GNU ld (GNU Binutils) 2.29.1<u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Could you try with either a recent gold or lld to see if it still reproduces? We don't test llvm LTO with GNU ld, so I can't be sure there are no issues there.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<blockquote style="border-top:none;border-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Thanks for the guidance on path names. The prefix-replace just effects the string written to the object files right? So we could post-process that file with other tools as well,
correct?<u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<div>
<p class="MsoNormal">Correct.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Teresa<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<blockquote style="border-top:none;border-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Thanks again<u></u><u></u></p>
<p class="MsoNormal" style="margin-bottom:12pt">--david<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(181,196,223);padding:3pt 0in 0in">
<p class="MsoNormal"><b><span style="font-size:12pt;color:black">From:
</span></b><span style="font-size:12pt;color:black">Teresa Johnson <<a href="mailto:tejohnson@google.com" target="_blank">tejohnson@google.com</a>><br>
<b>Date: </b>Tuesday, January 8, 2019 at 4:11 PM<br>
<b>To: </b>David Callahan <<a href="mailto:dcallahan@fb.com" target="_blank">dcallahan@fb.com</a>><br>
<b>Cc: </b>LLVM Dev Mailing list <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>><br>
<b>Subject: </b>Re: [llvm-dev] distributed thinlto usage</span><u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Hi David,
<u></u><u></u></p>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">That looks basically right, so I am not sure offhand what is wrong. Looks like this is the astar spec binary, so I will try to repro it tomorrow morning. What linker are you using?<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Note that if your link involves archives of .a files, you will want to ensure that the final native link includes only those files selected by the linker. That is output in the
file given to the "-Wl,-plugin-opt,thinlto-index-only=files.out" option. What we do is use that in combination with the '-Wl,-plugin-opt,<span class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102m7798277218057141552gmail-il">thinlto</span>-prefix-replace=path1;path2' option
to simplify the final link invocation. Specifically, if you do something like:<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> "-Wl,-plugin-opt,<span class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102m7798277218057141552gmail-il">thinlto</span>-<span class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102m7798277218057141552gmail-il">index</span>-<span class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102m7798277218057141552gmail-il">only</span>=files.out
-Wl,-plugin-opt,<span class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102m7798277218057141552gmail-il">thinlto</span>-prefix-replace=path1;path2"<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">for the indexing link step, the output files from the thin link will be written to a directory tree with the original path substring "path1" replaced with "path2", and the object
names in the file emitted by thinlto-index-only= ("files.out" in the above example), will have their path names adjusted to the new path as well - if your native .o files use the new path then this is a simple way of getting a list of input files for the final
link, which can be passed via @files.out to gold (note the gold manpage does not document "@" but the gnu ld manpage does).<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<p class="MsoNormal">I.e. something like:<br>
<br>
clang++ -flto=thin -O3 -c -o path1/foo.o foo.cpp <u></u><u></u></p>
<div>
<p class="MsoNormal">...<br>
clang++ -flto=thin -O3 -Wl,-plugin-opt,thinlto-index-only=files.out -Wl,-plugin-opt,<span class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102m7798277218057141552gmail-il">thinlto</span>-prefix-replace=path1;path2" foo.o ...<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">clang++ -c -x ir path1/foo.o -O3 -o path2/foo.o -fthinlto-index=path2/foo.o.thinlto.bc<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">...<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">clang++ -flto=thin -O3 -o a.out @files.out<u></u><u></u></p>
</div>
<div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">But again, that should only come into play if you are linking archives of bitcode files...<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Teresa<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"> <u></u><u></u></p>
</div>
</div>
<p class="MsoNormal"> <u></u><u></u></p>
<div>
<div>
<p class="MsoNormal">On Tue, Jan 8, 2019 at 2:38 PM David Callahan 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>
</div>
<blockquote style="border-top:none;border-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin:5pt 0in 5pt 4.8pt">
<div>
<div>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
I am trying to work through the usage of thinlto for distributed builds.<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
Here is the simple thinlto usage, just add -flto=thin everywhere, easy:<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o CreateWay_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else CreateWay_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o Places_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else Places_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o RegBounds_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else RegBounds_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o RegMng_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else RegMng_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o Way2_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else Way2_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o WayInit_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else WayInit_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o Library.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else Library.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o Random.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else Random.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o Region_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else Region_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o RegWay_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else RegWay_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o Way_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else Way_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -o astar.thin CreateWay_.o Places_.o RegBounds_.o RegMng_.o Way2_.o WayInit_.o Library.o Random.o Region_.o RegWay_.o Way_.o<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
My understanding is for the distributed, you need to do the inital compiles as above,<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
then a special link to get the thinlto index files, then compile again to get<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
native files, and then a final link. This looks like the following but<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
it does not work:<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o CreateWay_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else CreateWay_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o Places_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else Places_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o RegBounds_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else RegBounds_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o RegMng_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else RegMng_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o Way2_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else Way2_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o WayInit_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else WayInit_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o Library.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else Library.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o Random.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else Random.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o Region_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else Region_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o RegWay_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else RegWay_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -c -o Way_.o -DSPEC_CPU -DNDEBUG -DSPEC_CPU_LITTLE_ENDIAN -Wno-dangling-else Way_.cpp<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -flto=thin -O3 -o thinlto.objects <span style="background:yellow">
-Wl,-plugin-opt,thinlto-index-only=thinlto.objects</span> CreateWay_.o Places_.o RegBounds_.o RegMng_.o Way2_.o WayInit_.o Library.o Random.o Region_.o RegWay_.o Way_.o<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -c -x ir CreateWay_.o -O3 -o CreateWay_-native.o -fthinlto-index=CreateWay_.o.thinlto.bc<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -c -x ir Places_.o -O3 -o Places_-native.o -fthinlto-index=Places_.o.thinlto.bc<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -c -x ir RegBounds_.o -O3 -o RegBounds_-native.o -fthinlto-index=RegBounds_.o.thinlto.bc<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -c -x ir RegMng_.o -O3 -o RegMng_-native.o -fthinlto-index=RegMng_.o.thinlto.bc<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -c -x ir Way2_.o -O3 -o Way2_-native.o -fthinlto-index=Way2_.o.thinlto.bc<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -c -x ir WayInit_.o -O3 -o WayInit_-native.o -fthinlto-index=WayInit_.o.thinlto.bc<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -c -x ir Library.o -O3 -o Library-native.o -fthinlto-index=Library.o.thinlto.bc<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -c -x ir Random.o -O3 -o Random-native.o -fthinlto-index=Random.o.thinlto.bc<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -c -x ir Region_.o -O3 -o Region_-native.o -fthinlto-index=Region_.o.thinlto.bc<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -c -x ir RegWay_.o -O3 -o RegWay_-native.o -fthinlto-index=RegWay_.o.thinlto.bc<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -c -x ir Way_.o -O3 -o Way_-native.o -fthinlto-index=Way_.o.thinlto.bc<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang++ -o astar CreateWay_-native.o Places_-native.o RegBounds_-native.o RegMng_-native.o Way2_-native.o WayInit_-native.o Library-native.o Random-native.o Region_-native.o RegWay_-native.o Way_-native.o<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
<span style="background:aqua">Library-native.o:(.data+0x0): undefined reference to `vtable for regwayobj'</span><u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
clang-8: error: linker command failed with exit code 1 (use -v to see invocation)<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
make: *** [astar] Error 1<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
Did I miss a step? <u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
<u></u><u></u></p>
<p class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail-m_5400992142184465009m_4421731697753909132gmail-m-1186397316812610102gmail-m7798277218057141552gmail-m-3179742789606246467msoplaintext">
<u></u><u></u></p>
</div>
</div>
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<p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,sans-serif;color:rgb(85,85,85)">Teresa Johnson |</span><u></u><u></u></p>
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<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">-- <u></u><u></u></p>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail-m_7933712474072841744gmail-m_6008515586581161835gmail_signature"><div dir="ltr"><div><span style="font-family:Times;font-size:medium"><table cellspacing="0" cellpadding="0"><tbody><tr style="color:rgb(85,85,85);font-family:sans-serif;font-size:small"><td nowrap style="border-top:2px solid rgb(213,15,37)">Teresa Johnson |</td><td nowrap style="border-top:2px solid rgb(51,105,232)"> Software Engineer |</td><td nowrap style="border-top:2px solid rgb(0,153,57)"> <a href="mailto:tejohnson@google.com" target="_blank">tejohnson@google.com</a> |</td><td nowrap style="border-top:2px solid rgb(238,178,17)"><br></td></tr></tbody></table></span></div></div></div>