<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 --- - diagnostics missing from -Wc++-compat"
   href="http://llvm.org/bugs/show_bug.cgi?id=21524">21524</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>diagnostics missing from -Wc++-compat
          </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>C++
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>richard-llvm@metafoo.co.uk
          </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>From <a href="http://lists.cs.uiuc.edu/pipermail/cfe-dev/2014-November/039875.html">http://lists.cs.uiuc.edu/pipermail/cfe-dev/2014-November/039875.html</a>

clang doesn't print warning for following test-case:

compiled with: clang -fsyntax-only -Wc++-compat

int new;
struct A
{
  struct B
  {
    int x;
  }bs;
  int y;
};
struct B b;


gcc -fsyntax-only -Wc++-compat prints following warnings (gcc-4.9.1 ubuntu):

t.c:1:5: warning: identifier ‘new’ conflicts with C++ keyword [-Wc++-compat]
 int new;
      ^
t.c:13:8: warning: struct defined in struct or union is not visible in
C++ [-Wc++-compat]
 struct B b;
           ^
t.c:5:10: note: struct defined here
   struct B
             ^</pre>
        </div>
      </p>
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