<html>
    <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 --- - Support -FI with clang-cl"
   href="http://llvm.org/bugs/show_bug.cgi?id=17369">17369</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Support -FI with clang-cl
          </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>All
          </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>Driver
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>jmuizelaar@mozilla.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 imagine this would look something like:

diff --git a/include/clang/Driver/CLCompatOptions.td
b/include/clang/Driver/CLCompatOptions.td
index c912acc..565abdc 100644
--- a/include/clang/Driver/CLCompatOptions.td
+++ b/include/clang/Driver/CLCompatOptions.td
@@ -50,16 +50,18 @@ class CLRemainingArgs<string name> : Option<["/", "-"],
name,

 // Aliases:
 // (We don't put any of these in cl_compile_Group as the options they alias
are
 // already in the right group.)

 def _SLASH_c : CLFlag<"c">, HelpText<"Compile only">, Alias<c>;
 def _SLASH_D : CLJoinedOrSeparate<"D">, HelpText<"Define macro">,
   MetaVarName<"<macro[=value]>">, Alias<D>;
+def _SLASH_FI : CLJoinedOrSeparate<"FI">,
+  HelpText<"Include file before parsing"">, Alias<include>;
 def _SLASH_GR : CLFlag<"GR">, HelpText<"Enable RTTI">, Alias<frtti>;
 def _SLASH_GR_ : CLFlag<"GR-">, HelpText<"Disable RTTI">, Alias<fno_rtti>;
 def _SLASH_help : CLFlag<"help">, Alias<help>,
   HelpText<"Display available options">;
 def _SLASH_I : CLJoinedOrSeparate<"I">,
   HelpText<"Add directory to include search path">, MetaVarName<"<dir>">,
   Alias<I>;
 def _SLASH_J : CLFlag<"J">, HelpText<"Make char type unsigned">,</pre>
        </div>
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