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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">+Alexey<o:p></o:p></span></p>
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<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"> Sunita Chandrasekaran [mailto:schandra@udel.edu]
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<b>Sent:</b> Wednesday, December 4, 2019 7:02 PM<br>
<b>To:</b> openmp-dev@lists.llvm.org<br>
<b>Cc:</b> Jeffrey Kelling <j.kelling@hzdr.de>; Guido Juckeland <g.juckeland@hzdr.de>; Narayanaswamy, Ravi <ravi.narayanaswamy@intel.com>; Doerfert, Johannes Rudolf <jdoerfert@anl.gov><br>
<b>Subject:</b> Clang9 warning and compiler error with atomics<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">Hello Everyone <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">I guess I have not posted to this alias in the near past, but I probably *can* !<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">Guess we will find out :-) <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">(copying Ravi and Johannes just in case my mail doesn't get thru the mailing list..please let me know) <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">Some of us are working on an application PIConGPU which is also one of the 8 ORNL CAAR projects for Frontier system. There are 2 issues pointed out by the developer Jeffrey Kelling (copied
here) while he is running Alpaka tests with LLVM. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">1. Clang9 is spamming the a pointless warning:<br>
warning: Non-trivial type 'const<br>
alpaka::vec::Vec<std::__1::integral_constant<unsigned long, 1>, unsigned<br>
long>' is mapped, only trivial types are guara<br>
nteed to be mapped correctly [-Wopenmp-target]<br>
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While we are aware that the warning will appear, we need to turn off -werror<br>
because of this, may miss more important warnings due to the spam. Jeff also does not want to turn of -Wopenmp-target, because these should be the most<br>
interesting warnings. It would be nice, if this one could be fixed.<br>
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2. Jeff also just encountered an internal compiler error with atomics and the NVPTX backend, and created a bug report:<br>
<a href="https://bugs.llvm.org/show_bug.cgi?id=44219">https://bugs.llvm.org/show_bug.cgi?id=44219</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">Addressing these issues for CAAR is very time critical and that led me to send an email to this mailing list to get some quick advice/insights into both these issues.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">Thank you very much for your time!!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">Cheers<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">sunita<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">----------------------------------------</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">Sunita Chandrasekaran<br>
Asst. Prof. Computer and Information Sciences<br>
Affiliated, Center for Bioinformatics and Computational Biology</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">Affiliated, Data Science Institute </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">University of Delaware </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">430 Smith Hall, Newark, DE, USA</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">p: 302-831-2714 e: <a href="mailto:schandra@udel.edu" target="_blank"><span style="color:#1155CC">schandra@udel.edu</span></a></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">Adjunct Prof. Dept. of Computer Science</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">University of Houston, TX<br>
----------------------------------------</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">CRPL <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">Research Group: <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif"><a href="http://crpl.cis.udel.edu/" target="_blank"><span style="color:#1155CC">http://crpl.cis.udel.edu/</span></a></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Trebuchet MS",sans-serif">t: <a href="https://twitter.com/sunitachandra29" target="_blank"><span style="color:#1155CC">https://twitter.com/sunitachandra29</span></a><br>
w: <a href="https://www.eecis.udel.edu/~schandra/" target="_blank"><span style="color:#1155CC">https://www.eecis.udel.edu/~schandra/</span></a></span><o:p></o:p></p>
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