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    <head>
      <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 --- - .d files should contain relative paths if relative paths are specified in the module map"
   href="http://llvm.org/bugs/show_bug.cgi?id=21612">21612</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>.d files should contain relative paths if relative paths are specified in the module map
          </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>Linux
          </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>Modules
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>klimek@google.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Basic test (minus correct CHECK line ;)

test/Modules/dependency-gen.cppmap:
// RUN: cd %S
// RUN: %clang_cc1 -x c++ -fmodule-name=test -emit-module dependency-gen.cppmap
dependency-file %t.d -MT %t.pcm
// RUN: FileCheck %s < %t.d
module "test" {
  header "Inputs/dependency-gen.h"
}

Currently the .d file will contain the absolute path to
Inputs/dependency-gen.h, which is explicitly done when we create the C++ code
buffer with the #include lines.
The relative path in the module file means "relatively to the module file",
which is actually very similar to how -include directives are handled. The main
reason we can't trigger the same code path as -include currently is that we
don't have a file, as the code we parse is in a virtual buffer, which has no
way to point back to the module map file.</pre>
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