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    <head>
      <base href="http://llvm.org/bugs/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Visibility attribute ignored on variable templates"
   href="http://llvm.org/bugs/show_bug.cgi?id=19597">19597</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Visibility attribute ignored on variable templates
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>All
          </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>LLVM Codegen
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>david.majnemer@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>consider:
template <typename T> __attribute__((visibility("hidden"))) const int &x = 4;
template const int &x<void>;

codgen looks bad:
@_Z1xIvE = weak_odr constant i32* @_ZGR1xIvE, align 8

however, it works fine for non-static data members, their close relatives:
template <typename T> struct S {
  __attribute__((visibility("hidden"))) static const int &x;
};
template <typename T> const int &S<T>::x = 4;
template const int &S<void>::x;

@_ZN1SIvE1xE = weak_odr hidden constant i32* @_ZGRN1SIvE1xE, align 8</pre>
        </div>
      </p>
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