<html>
    <head>
      <base href="http://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 --- - Member functions of class templates not instantiated despite [[gnu::used]]"
   href="http://llvm.org/bugs/show_bug.cgi?id=19923">19923</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Member functions of class templates not instantiated despite [[gnu::used]]
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>3.4
          </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++
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>llvm-bugs@quasiparticle.net
          </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>In a class template, g++ instantiates member functions marked with
[[gnu::used]] even when those functions are used nowhere in the program. clang
does not. This causes code to compile that doesn't compile on g++, e.g.

#include <type_traits>

template<class I>
class X {
  [[gnu::used]]
  static void check() {
    static_assert(std::is_enum<I>::value, "");
  }
};

X<int> x;</pre>
        </div>
      </p>
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