<html>
    <head>
      <base href="https://llvm.org/bugs/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Aarch64: libstdc++ std::thread, when compiled with clang, "pure virtual method called""
   href="https://llvm.org/bugs/show_bug.cgi?id=23428">23428</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Aarch64: libstdc++ std::thread, when compiled with clang, "pure virtual method called"
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>C++11
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>danilo.piparo@cern.ch
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>cat stdthreadbug.cpp
#include <thread>

int main()
{
   std::thread t([](){});
   t.join();
}

$clang++ -v
clang version 3.7.0 (trunk 236571) (llvm/trunk 236570)
Target: aarch64-unknown-linux-gnu
Thread model: posix

$clang++ -std=c++11 -pthread stdthreadbug.cpp -o stdthreadbug 

$./stdthreadbug 
pure virtual method called
terminate called without an active exception
Aborted

Note that this works:

cat stdthreadbugkludge.cpp
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8

#include <thread>

int main()
{
   std::thread t([](){});
   t.join();
}

One of the many ways in which one might fix this is the following:

Index: lib/Basic/Targets.cpp
===================================================================
--- lib/Basic/Targets.cpp       (revision 236571)
+++ lib/Basic/Targets.cpp       (working copy)
@@ -4926,6 +4926,11 @@

     if (Crypto)
       Builder.defineMacro("__ARM_FEATURE_CRYPTO");
+
+    Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1");
+    Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2");
+    Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4");
+    Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8");
   }

   void getTargetBuiltins(const Builtin::Info *&Records,</pre>
        </div>
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