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<title>Using the GNU Compiler Collection (GCC): MN10300 Options</title>
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<a name="MN10300-Options"></a>
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<div class="header">
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<p>
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Next: <a href="Moxie-Options.html#Moxie-Options" accesskey="n" rel="next">Moxie Options</a>, Previous: <a href="MMIX-Options.html#MMIX-Options" accesskey="p" rel="prev">MMIX Options</a>, Up: <a href="Submodel-Options.html#Submodel-Options" accesskey="u" rel="up">Submodel Options</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="MN10300-Options-1"></a>
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<h4 class="subsection">3.18.28 MN10300 Options</h4>
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<a name="index-MN10300-options"></a>
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<p>These <samp>-m</samp> options are defined for Matsushita MN10300 architectures:
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</p>
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<dl compact="compact">
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<dt><code>-mmult-bug</code></dt>
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<dd><a name="index-mmult_002dbug"></a>
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<p>Generate code to avoid bugs in the multiply instructions for the MN10300
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processors. This is the default.
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</p>
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</dd>
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<dt><code>-mno-mult-bug</code></dt>
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<dd><a name="index-mno_002dmult_002dbug"></a>
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<p>Do not generate code to avoid bugs in the multiply instructions for the
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MN10300 processors.
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</p>
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</dd>
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<dt><code>-mam33</code></dt>
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<dd><a name="index-mam33"></a>
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<p>Generate code using features specific to the AM33 processor.
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</p>
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</dd>
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<dt><code>-mno-am33</code></dt>
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<dd><a name="index-mno_002dam33"></a>
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<p>Do not generate code using features specific to the AM33 processor. This
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is the default.
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</p>
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</dd>
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<dt><code>-mam33-2</code></dt>
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<dd><a name="index-mam33_002d2"></a>
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<p>Generate code using features specific to the AM33/2.0 processor.
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</p>
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</dd>
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<dt><code>-mam34</code></dt>
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<dd><a name="index-mam34"></a>
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<p>Generate code using features specific to the AM34 processor.
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</p>
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</dd>
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<dt><code>-mtune=<var>cpu-type</var></code></dt>
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<dd><a name="index-mtune-9"></a>
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<p>Use the timing characteristics of the indicated CPU type when
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scheduling instructions. This does not change the targeted processor
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type. The CPU type must be one of ‘<samp>mn10300</samp>’, ‘<samp>am33</samp>’,
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‘<samp>am33-2</samp>’ or ‘<samp>am34</samp>’.
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</p>
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</dd>
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<dt><code>-mreturn-pointer-on-d0</code></dt>
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<dd><a name="index-mreturn_002dpointer_002don_002dd0"></a>
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<p>When generating a function that returns a pointer, return the pointer
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in both <code>a0</code> and <code>d0</code>. Otherwise, the pointer is returned
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only in <code>a0</code>, and attempts to call such functions without a prototype
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result in errors. Note that this option is on by default; use
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<samp>-mno-return-pointer-on-d0</samp> to disable it.
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</p>
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</dd>
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<dt><code>-mno-crt0</code></dt>
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<dd><a name="index-mno_002dcrt0"></a>
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<p>Do not link in the C run-time initialization object file.
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</p>
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</dd>
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<dt><code>-mrelax</code></dt>
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<dd><a name="index-mrelax-2"></a>
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<p>Indicate to the linker that it should perform a relaxation optimization pass
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to shorten branches, calls and absolute memory addresses. This option only
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has an effect when used on the command line for the final link step.
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</p>
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<p>This option makes symbolic debugging impossible.
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</p>
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</dd>
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<dt><code>-mliw</code></dt>
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<dd><a name="index-mliw"></a>
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<p>Allow the compiler to generate <em>Long Instruction Word</em>
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instructions if the target is the ‘<samp>AM33</samp>’ or later. This is the
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default. This option defines the preprocessor macro <code>__LIW__</code>.
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</p>
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</dd>
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<dt><code>-mnoliw</code></dt>
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<dd><a name="index-mnoliw"></a>
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<p>Do not allow the compiler to generate <em>Long Instruction Word</em>
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instructions. This option defines the preprocessor macro
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<code>__NO_LIW__</code>.
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</p>
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</dd>
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<dt><code>-msetlb</code></dt>
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<dd><a name="index-msetlb"></a>
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<p>Allow the compiler to generate the <em>SETLB</em> and <em>Lcc</em>
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instructions if the target is the ‘<samp>AM33</samp>’ or later. This is the
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default. This option defines the preprocessor macro <code>__SETLB__</code>.
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</p>
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</dd>
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<dt><code>-mnosetlb</code></dt>
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<dd><a name="index-mnosetlb"></a>
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<p>Do not allow the compiler to generate <em>SETLB</em> or <em>Lcc</em>
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instructions. This option defines the preprocessor macro
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<code>__NO_SETLB__</code>.
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</p>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Moxie-Options.html#Moxie-Options" accesskey="n" rel="next">Moxie Options</a>, Previous: <a href="MMIX-Options.html#MMIX-Options" accesskey="p" rel="prev">MMIX Options</a>, Up: <a href="Submodel-Options.html#Submodel-Options" accesskey="u" rel="up">Submodel Options</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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