<html>
    <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 - static object mangling conflicts"
   href="https://bugs.llvm.org/show_bug.cgi?id=37885">37885</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>static object mangling conflicts
          </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>Linux
          </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++
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>zhonghao@pku.org.cn
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>I found that gcc+ produces errors when it compiles the following code:
extern "C" void abort();
static int i;
int *p = &i;
int main()

 int i;
 { 
 extern int i;
 i = 1;
 *p = 2;
 if (i == 2)
 abort ();
 }
 return 0;
}

When compiling the above code, clang++ does not produce any errors. The code
comes from <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - clang should probably mangle statics"
   href="show_bug.cgi?id=5966">https://bugs.llvm.org/show_bug.cgi?id=5966</a>

Indeed, the situation is more complicated. The above bug report of clang says
that the code comes from a bug report of gcc:
<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31775">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=31775</a>

I reported the difference to gcc:
<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86181">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86181</a>

After reading the bug report, Richard Biener made the following comment: "I
think the clang bug is incomplete and misses the 2nd TU which defines i.  So
GCC works (and the testcase is in the testsuite)."

Is this a recurring bug in clang? Hope that the comment from Richard Biener can
further improve clang.</pre>
        </div>
      </p>


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