toolchain/gcc-linaro-6.3.1-2017.02-x8.../share/doc/gcc/H8_002f300-Options.html

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<title>Using the GNU Compiler Collection (GCC): H8/300 Options</title>

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<a name="H8_002f300-Options-1"></a>
<h4 class="subsection">3.18.16 H8/300 Options</h4>

<p>These &lsquo;<samp>-m</samp>&rsquo; options are defined for the H8/300 implementations:
</p>
<dl compact="compact">
<dt><code>-mrelax</code></dt>
<dd><a name="index-mrelax-1"></a>
<p>Shorten some address references at link time, when possible; uses the
linker option <samp>-relax</samp>.  See <a href="http://sourceware.org/binutils/docs/ld/H8_002f300.html#H8_002f300"><code>ld</code> and the H8/300</a> in <cite>Using ld</cite>, for a fuller description.
</p>
</dd>
<dt><code>-mh</code></dt>
<dd><a name="index-mh"></a>
<p>Generate code for the H8/300H.
</p>
</dd>
<dt><code>-ms</code></dt>
<dd><a name="index-ms"></a>
<p>Generate code for the H8S.
</p>
</dd>
<dt><code>-mn</code></dt>
<dd><a name="index-mn"></a>
<p>Generate code for the H8S and H8/300H in the normal mode.  This switch
must be used either with <samp>-mh</samp> or <samp>-ms</samp>.
</p>
</dd>
<dt><code>-ms2600</code></dt>
<dd><a name="index-ms2600"></a>
<p>Generate code for the H8S/2600.  This switch must be used with <samp>-ms</samp>.
</p>
</dd>
<dt><code>-mexr</code></dt>
<dd><a name="index-mexr"></a>
<p>Extended registers are stored on stack before execution of function
with monitor attribute. Default option is <samp>-mexr</samp>.
This option is valid only for H8S targets.
</p>
</dd>
<dt><code>-mno-exr</code></dt>
<dd><a name="index-mno_002dexr"></a>
<p>Extended registers are not stored on stack before execution of function
with monitor attribute. Default option is <samp>-mno-exr</samp>.
This option is valid only for H8S targets.
</p>
</dd>
<dt><code>-mint32</code></dt>
<dd><a name="index-mint32-1"></a>
<p>Make <code>int</code> data 32 bits by default.
</p>
</dd>
<dt><code>-malign-300</code></dt>
<dd><a name="index-malign_002d300"></a>
<p>On the H8/300H and H8S, use the same alignment rules as for the H8/300.
The default for the H8/300H and H8S is to align longs and floats on
4-byte boundaries.
<samp>-malign-300</samp> causes them to be aligned on 2-byte boundaries.
This option has no effect on the H8/300.
</p></dd>
</dl>


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