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    <head>
      <base href="https://bugs.llvm.org/">
    </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 - Support -std=c++20/gnu++20"
   href="https://bugs.llvm.org/show_bug.cgi?id=44939">44939</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Support -std=c++20/gnu++20
          </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>All
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>C++2a
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>romain.geissler@amadeus.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Hi,

C++20 was marked as (technically) done at the Prague meeting last week, so now
there is no need to call this standard C++2a, it is officially C++20. Thus
clang should accept -std=c++20/gnu++20 which doesn't seem to be the case with
the current trunk (at least on Compiler Explorer). gcc has added this very
recently with this commit:
<a href="https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=fb26050409473f5be54465beca114b7e48de43aa">https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=fb26050409473f5be54465beca114b7e48de43aa</a>

I also think this is a possible candidate for a backport into the soon to be
released Clang 10.

Cheers,
Romain</pre>
        </div>
      </p>


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