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      <base href="https://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 --- - error: too many arguments to function call, expected single argument '__pq', have 2 arguments void swap(priority_queue __pq) noexcept(noexcept(swap(comp, comp)));"
   href="https://llvm.org/bugs/show_bug.cgi?id=28423">28423</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>error: too many arguments to function call, expected single argument '__pq', have 2 arguments   void swap(priority_queue __pq) noexcept(noexcept(swap(comp, comp)));
          </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>Modules
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>biancacristinacristescu@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>This issue is seen when building llvm self-hosted with libstdc++.
The invocation is:
"/home/biancacr/clang_build_/inst/bin/clang-3.9" -cc1  -D
__STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I
includes/home/biancacr/clang_build_/objmod/lib/CodeGen -I
includes/home/biancacr/clang_build_/src/lib/CodeGen -I
includes/home/biancacr/clang_build_/objmod/include -I
includes/home/biancacr/clang_build_/src/include  -I
includes/usr/include/c++/5.2.1 -I
includes/usr/include/x86_64-linux-gnu/c++/5.2.1 -I
includes/usr/include/x86_64-linux-gnu/c++/5.2.1  -I includes/usr/local/include
-I includes/home/biancacr/clang_build_/inst/lib/clang/3.9.0/include -I
includes/usr/include/x86_64-linux-gnu  -I includes/usr/include  -std=c++11 
-fmodules -fimplicit-module-maps -fmodules-cache-path=./module.cache 
-fmodules-local-submodule-visibility  LiveDebugValues.cpp

It seems like there is a misbehaviour between how the:
#pragma GCC system_header
is treated in the non-module case and in the modules case.

The reproducer needs to use namespace std{} as well. There might be a specific
code path that is taken only in the case of std.</pre>
        </div>
      </p>
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