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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 --- - configure complains that cxxabi.h is present but cannot be compiled"
   href="http://llvm.org/bugs/show_bug.cgi?id=15877">15877</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>configure complains that cxxabi.h is present but cannot be compiled
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>Build scripts
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </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>autoconf
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>bugzilla@jwwalker.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>I was in a build directory that's a sibling of the llvm repository directory,
and typed

  ../llvm/configure --prefix=/opt --enable-optimized

Among lots of output was this:

checking cxxabi.h usability... no
checking cxxabi.h presence... yes
configure: WARNING: cxxabi.h: present but cannot be compiled
configure: WARNING: cxxabi.h:     check for missing prerequisite headers?
configure: WARNING: cxxabi.h: see the Autoconf documentation
configure: WARNING: cxxabi.h:     section "Present But Cannot Be Compiled"
configure: WARNING: cxxabi.h: proceeding with the preprocessor's result
configure: WARNING: cxxabi.h: in the future, the compiler will take precedence
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to <a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> ##
configure: WARNING:     ## ------------------------------------ ##
checking for cxxabi.h... yes


I don't know what it's about, but it says to report it.

llvm svn revision 180835.  Mac OS X 10.7.5.  Xcode 4.6.2.</pre>
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