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+<a name="Module-Preprocessing"></a>
+<h4 class="subsection">3.23.2 Module Preprocessing</h4>
+<a name="index-C_002b_002b-Module-Preprocessing"></a>
+
+<p>Modules affect preprocessing because of header units and include
+translation.  Some uses of the preprocessor as a separate step either
+do not produce a correct output, or require CMIs to be available.
+</p>
+<p>Header units import macros.  These macros can affect later conditional
+inclusion, which therefore can cascade to differing import sets.  When
+preprocessing, it is necessary to load the CMI.  If a header unit is
+unavailable, the preprocessor issues a warning and continue (when
+not just preprocessing, an error is emitted).  Detecting such imports
+requires preprocessor tokenization of the input stream to phase 4
+(macro expansion).
+</p>
+<p>Include translation converts <code>#include</code>, <code>#include_next</code> and
+<code>#import</code> directives to internal <code>import</code> declarations.
+Whether a particular directive is translated is controlled by the
+module mapper.  Header unit names are canonicalized during
+preprocessing.
+</p>
+<p>Dependency information can be emitted for macro import, extending the
+functionality of <samp>-MD</samp> and <samp>-MMD</samp> options.  Detection of
+import declarations also requires phase 4 preprocessing, and thus
+requires full preprocessing (or compilation).
+</p>
+<p>The <samp>-M</samp>, <samp>-MM</samp> and <samp>-E -fdirectives-only</samp> options halt
+preprocessing before phase 4.
+</p>
+<p>The <samp>-save-temps</samp> option uses <samp>-fdirectives-only</samp> for
+preprocessing, and preserve the macro definitions in the preprocessed
+output.  Usually you also want to use this option when explicitly
+preprocessing a header-unit, or consuming such preprocessed output:
+</p>
+<div class="smallexample">
+<pre class="smallexample">g++ -fmodules-ts -E -fdirectives-only my-header.hh -o my-header.ii
+g++ -x c++-header -fmodules-ts -fpreprocessed -fdirectives-only my-header.ii
+</pre></div>
+
+
+
+
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