<html>
    <head>
      <base href="http://llvm.org/bugs/" />
    </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 --- - modules do not work with relative -I paths"
   href="http://llvm.org/bugs/show_bug.cgi?id=15207">15207</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>modules do not work with relative -I paths
          </td>
        </tr>

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

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

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

        <tr>
          <th>Reporter</th>
          <td>richard-llvm@metafoo.co.uk
          </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>$ mkdir bar
$ touch bar/foo.h
$ echo 'module foo { header "foo.h" }' > bar/module.map
$ echo '@import foo;' > foo.mm
$ clang foo.mm -Xclang -fmodules -I bar -c
<module-includes>:1:9: fatal error: 'bar/foo.h' file not found
#import "bar/foo.h"
        ^
1 error generated.
$ clang foo.mm -Xclang -fmodules -I $PWD/bar -c
$

I believe the problem is that we run the module compilation from within the
directory containing the module.map file, but the -I paths are relative to the
directory containing the original source file.</pre>
        </div>
      </p>
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