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<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">It won't be required for the scan stage will it?<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">No, it won’t be.<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">-- Gaby<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal"><b>From:</b> Modules &lt;modules-bounces@lists.isocpp.org&gt; <b>On Behalf Of
</b>Mathias Stearn<br>
<b>Sent:</b> Wednesday, March 6, 2019 12:02 PM<br>
<b>To:</b> Ben Boeckel via Modules &lt;modules@lists.isocpp.org&gt;<br>
<b>Cc:</b> boris@codesynthesis.com; brad.king@kitware.com; WG21 Tooling Study Group SG15 &lt;tooling@open-std.org&gt;; Ben Boeckel &lt;ben.boeckel@kitware.com&gt;<br>
<b>Subject:</b> Re: [isocpp-modules] [Tooling] Dependency information for module-aware build tools<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">On Wed, Mar 6, 2019 at 10:18 AM Nathan Sidwell &lt;<a href="mailto:nathan@acm.org">nathan@acm.org</a>&gt; wrote:<o:p></o:p></p>
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<p class="MsoNormal">Yes, a BMI is required for a header import.&nbsp; Textually including the
<br>
header import's original header file is not equivalent.<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">It won't be required for the scan stage will it? If it is, there is a bootstrapping problem because there is no good way to figure out which order to build the header-unit BMIs in if they import other header-units. I've been assuming that
 the scan stage will be able to just temporarily mask off the defines and replace them with the correct ones for the header-unit while scanning a file, so that scanning has no generated dependencies.<o:p></o:p></p>
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