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      <base href="http://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 --- - __attirbute__ ((common)) has no expected effect when compiling for iOS or iOS Simulator"

   href="http://llvm.org/bugs/show_bug.cgi?id=16330">16330</a>

          </td>

        </tr>

        <tr>

          <th>Summary</th>

          <td>__attirbute__ ((common)) has no expected effect when compiling for iOS or iOS Simulator

          </td>

        </tr>

        <tr>

          <th>Product</th>

          <td>dragonegg

          </td>

        </tr>

        <tr>

          <th>Version</th>

          <td>unspecified

          </td>

        </tr>

        <tr>

          <th>Hardware</th>

          <td>Macintosh

          </td>

        </tr>

        <tr>

          <th>OS</th>

          <td>MacOS X

          </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>New Bugs

          </td>

        </tr>

        <tr>

          <th>Assignee</th>

          <td>baldrick@free.fr

          </td>

        </tr>

        <tr>

          <th>Reporter</th>

          <td>petr.lefner@aponia.com

          </td>

        </tr>

        <tr>

          <th>CC</th>

          <td>llvmbugs@cs.uiuc.edu

          </td>

        </tr>

        <tr>

          <th>Classification</th>

          <td>Unclassified

          </td>

        </tr></table>

      <p>

        <div>

        <pre>Hello,

had someone ever used Clang's extensions inside ObjC++ file, namely the

__attribute__ ((common)) ?

For me, there's a problem with that, LLVM Linker reports 'duplicit symbol'

error if I declare a variable with same name in .mm file and one or more .m or

.cpp files:

/* foo_A.m */

__attribute__ ((common)) int foo;

/* foo_B.m */

__attribute__ ((common)) int foo;

/* foo_C.mm */

__attribute__ ((common)) int foo;

Gives linker error.

However, everything is fine, once I obey the use of 'foo' in the 'foo_C.mm', or

just rename the variable - linker feels happy.

Is this behavior expected?

Reported clang version:

clang++ --version

Apple LLVM version 5.0 (clang-500.1.58) (based on LLVM 3.3svn)

Target: x86_64-apple-darwin12.4.0

Thread model: posix

LLVM version:

llvm-g++-4.2 --version

i686-apple-darwin11-llvm-g++-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658)

(LLVM build 2336.11.00)

This is free software; see the source for copying conditions.  There is NO

warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.</pre>

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