<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 - Block scope function declaration with implicit int + GNU attribute"
   href="https://bugs.llvm.org/show_bug.cgi?id=48672">48672</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Block scope function declaration with implicit int + GNU attribute
          </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>Windows NT
          </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>aaron@aaronballman.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>In the following in C89 mode, h() is treated as a function declaration with an
implicit int return type in GCC, but is rejected by Clang as an invalid
declaration:

```
__attribute__(()) g(); // Accepted by both Clang and GCC

void func(void) {
  __attribute__(()) h(); // Rejected by Clang, accepted by GCC
  __attribute__(()) extern i(); // Accepted by both Clang and GCC
  j(); // Function call expr to an implicitly-declared function j() in
       // both Clang and GCC.
}
```
GCC and Clang both use the presence of a GNU-style attribute to signal that
what follows is a declaration, but it seems that Clang's handling requires some
kind of declaration specifier (like the `extern` keyword) to get this correct
at block scope.</pre>
        </div>
      </p>


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