<div dir="ltr">FTR, I've disabled libcxx checkout on that particular <a href="http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fuzzer">bot</a> to make it green.<div>The problem remains, of course. :(</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Dec 11, 2016 at 7:23 AM, James Knight <span dir="ltr"><<a href="mailto:jyknight@google.com" target="_blank">jyknight@google.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Dec 11, 2016, at 3:33 AM, Eric Fiselier via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>> wrote:<br>
> So it seems that libatomic went missing between build #1379 and #1380, so I don't think this is related to the -std=c++11 failure. Instead it seems likely that the compile test for -std=c++11 is failing due to mis-configuring -latomic.<br>
><br>
> Can you confirm the bot has libatomic installed?<br>
<br>
</span>You shouldn't need it on x86-64. The issue there is that cmake is reporting, incorrectly:<br>
-- Performing Test LIBCXX_HAVE_CXX_ATOMICS_<wbr>WITHOUT_LIB<br>
-- Performing Test LIBCXX_HAVE_CXX_ATOMICS_<wbr>WITHOUT_LIB - Failed<br>
<br>
despite that previously in the same run, the same test configuring llvm itself worked:<br>
-- Performing Test HAVE_CXX_ATOMICS_WITHOUT_LIB<br>
-- Performing Test HAVE_CXX_ATOMICS_WITHOUT_LIB - Success<br>
<br>
I suspect that the flags change has somehow caused *all* compiler invocations to fail, and that results in both the erroneously-failed atomic check and the erroneously-failed std=c++11 check.</blockquote></div><br></div>