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      <base href="http://llvm.org/bugs/" />

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    <body><span class="vcard"><a class="email" href="mailto:mclow.lists@gmail.com" title="Marshall Clow (home) <mclow.lists@gmail.com>"> <span class="fn">Marshall Clow (home)</span></a>

</span> changed

              <a class="bz_bug_link 

          bz_status_RESOLVED  bz_closed"

   title="RESOLVED INVALID - Linker errors on std::getline when including only <string> and not <istream>"

   href="http://llvm.org/bugs/show_bug.cgi?id=20960">bug 20960</a>

        <br>

             <table border="1" cellspacing="0" cellpadding="8">

          <tr>

            <th>What</th>

            <th>Removed</th>

            <th>Added</th>

          </tr>

         <tr>

           <td style="text-align:right;">Status</td>

           <td>NEW

           </td>

           <td>RESOLVED

           </td>

         </tr>

         <tr>

           <td style="text-align:right;">Resolution</td>

           <td>---

           </td>

           <td>INVALID

           </td>

         </tr></table>

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        <div>

            <b><a class="bz_bug_link 

          bz_status_RESOLVED  bz_closed"

   title="RESOLVED INVALID - Linker errors on std::getline when including only <string> and not <istream>"

   href="http://llvm.org/bugs/show_bug.cgi?id=20960#c1">Comment # 1</a>

              on <a class="bz_bug_link 

          bz_status_RESOLVED  bz_closed"

   title="RESOLVED INVALID - Linker errors on std::getline when including only <string> and not <istream>"

   href="http://llvm.org/bugs/show_bug.cgi?id=20960">bug 20960</a>

              from <span class="vcard"><a class="email" href="mailto:mclow.lists@gmail.com" title="Marshall Clow (home) <mclow.lists@gmail.com>"> <span class="fn">Marshall Clow (home)</span></a>

</span></b>

        <pre>Howard provided me with this reference:

17.6.2.2 [using.headers]/p3 A translation unit shall include a header only

outside of any external declaration or definition, and shall include the header

lexically before the first reference in that translation unit to any of the

entities declared in that header. No diagnostic is required.

This states that your example code is undefined behavior (with no diagnostic

required!) because you reference std::istream without #include <istream>.</pre>

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