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    <head>
      <base href="http://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 - Clang manual should describe the include file search process"
   href="http://bugs.llvm.org/show_bug.cgi?id=32742">32742</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Clang manual should describe the include file search process
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </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>Documentation
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>guy@alum.mit.edu
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>I'm in the middle of trying to figure out why somebody's Wireshark build on
macOS fails with autotools and succeeds with CMake; it appears that it's not
finding header files in /usr/local/include with the autotools build but finding
them with the CMake build.

The CMake build is building with -isystem /usr/local/include, but the autotools
build isn't - but I can't find anything that would describe why adding it would
make a difference.  The Clang manual at

    <a href="http://clang.llvm.org/docs/UsersManual.html">http://clang.llvm.org/docs/UsersManual.html</a>

doesn't appear to say very much about it.

The version of Clang they're using is

Apple LLVM version 8.1.0 (clang-802.0.42)
Target: x86_64-apple-darwin16.5.0
Thread model: posix
InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

I have the same version on my machine, but my autotools builds work Just Fine,
finding the headers in /usr/local/include.</pre>
        </div>
      </p>


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