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<title>Using the GNU Compiler Collection (GCC): MSP430 Options</title>

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<a name="MSP430-Options"></a>
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<hr>
<a name="MSP430-Options-1"></a>
<h4 class="subsection">3.18.30 MSP430 Options</h4>
<a name="index-MSP430-Options"></a>

<p>These options are defined for the MSP430:
</p>
<dl compact="compact">
<dt><code>-masm-hex</code></dt>
<dd><a name="index-masm_002dhex"></a>
<p>Force assembly output to always use hex constants.  Normally such
constants are signed decimals, but this option is available for
testsuite and/or aesthetic purposes.
</p>
</dd>
<dt><code>-mmcu=</code></dt>
<dd><a name="index-mmcu_003d"></a>
<p>Select the MCU to target.  This is used to create a C preprocessor
symbol based upon the MCU name, converted to upper case and pre- and
post-fixed with &lsquo;<samp>__</samp>&rsquo;.  This in turn is used by the
<samp>msp430.h</samp> header file to select an MCU-specific supplementary
header file.
</p>
<p>The option also sets the ISA to use.  If the MCU name is one that is
known to only support the 430 ISA then that is selected, otherwise the
430X ISA is selected.  A generic MCU name of &lsquo;<samp>msp430</samp>&rsquo; can also be
used to select the 430 ISA.  Similarly the generic &lsquo;<samp>msp430x</samp>&rsquo; MCU
name selects the 430X ISA.
</p>
<p>In addition an MCU-specific linker script is added to the linker
command line.  The script&rsquo;s name is the name of the MCU with
<samp>.ld</samp> appended.  Thus specifying <samp>-mmcu=xxx</samp> on the <code>gcc</code>
command line defines the C preprocessor symbol <code>__XXX__</code> and
cause the linker to search for a script called <samp>xxx.ld</samp>.
</p>
<p>This option is also passed on to the assembler.
</p>
</dd>
<dt><code>-mwarn-mcu</code></dt>
<dt><code>-mno-warn-mcu</code></dt>
<dd><a name="index-mwarn_002dmcu"></a>
<a name="index-mno_002dwarn_002dmcu"></a>
<p>This option enables or disables warnings about conflicts between the
MCU name specified by the <samp>-mmcu</samp> option and the ISA set by the
<samp>-mcpu</samp> option and/or the hardware multiply support set by the
<samp>-mhwmult</samp> option.  It also toggles warnings about unrecognized
MCU names.  This option is on by default.
</p>
</dd>
<dt><code>-mcpu=</code></dt>
<dd><a name="index-mcpu_003d-3"></a>
<p>Specifies the ISA to use.  Accepted values are &lsquo;<samp>msp430</samp>&rsquo;,
&lsquo;<samp>msp430x</samp>&rsquo; and &lsquo;<samp>msp430xv2</samp>&rsquo;.  This option is deprecated.  The
<samp>-mmcu=</samp> option should be used to select the ISA.
</p>
</dd>
<dt><code>-msim</code></dt>
<dd><a name="index-msim-6"></a>
<p>Link to the simulator runtime libraries and linker script.  Overrides
any scripts that would be selected by the <samp>-mmcu=</samp> option.
</p>
</dd>
<dt><code>-mlarge</code></dt>
<dd><a name="index-mlarge"></a>
<p>Use large-model addressing (20-bit pointers, 32-bit <code>size_t</code>).
</p>
</dd>
<dt><code>-msmall</code></dt>
<dd><a name="index-msmall"></a>
<p>Use small-model addressing (16-bit pointers, 16-bit <code>size_t</code>).
</p>
</dd>
<dt><code>-mrelax</code></dt>
<dd><a name="index-mrelax-3"></a>
<p>This option is passed to the assembler and linker, and allows the
linker to perform certain optimizations that cannot be done until
the final link.
</p>
</dd>
<dt><code>mhwmult=</code></dt>
<dd><a name="index-mhwmult_003d"></a>
<p>Describes the type of hardware multiply supported by the target.
Accepted values are &lsquo;<samp>none</samp>&rsquo; for no hardware multiply, &lsquo;<samp>16bit</samp>&rsquo;
for the original 16-bit-only multiply supported by early MCUs.
&lsquo;<samp>32bit</samp>&rsquo; for the 16/32-bit multiply supported by later MCUs and
&lsquo;<samp>f5series</samp>&rsquo; for the 16/32-bit multiply supported by F5-series MCUs.
A value of &lsquo;<samp>auto</samp>&rsquo; can also be given.  This tells GCC to deduce
the hardware multiply support based upon the MCU name provided by the
<samp>-mmcu</samp> option.  If no <samp>-mmcu</samp> option is specified or if
the MCU name is not recognized then no hardware multiply support is
assumed.  <code>auto</code> is the default setting.
</p>
<p>Hardware multiplies are normally performed by calling a library
routine.  This saves space in the generated code.  When compiling at
<samp>-O3</samp> or higher however the hardware multiplier is invoked
inline.  This makes for bigger, but faster code.
</p>
<p>The hardware multiply routines disable interrupts whilst running and
restore the previous interrupt state when they finish.  This makes
them safe to use inside interrupt handlers as well as in normal code.
</p>
</dd>
<dt><code>-minrt</code></dt>
<dd><a name="index-minrt"></a>
<p>Enable the use of a minimum runtime environment - no static
initializers or constructors.  This is intended for memory-constrained
devices.  The compiler includes special symbols in some objects
that tell the linker and runtime which code fragments are required.
</p>
</dd>
<dt><code>-mcode-region=</code></dt>
<dt><code>-mdata-region=</code></dt>
<dd><a name="index-mcode_002dregion"></a>
<a name="index-mdata_002dregion"></a>
<p>These options tell the compiler where to place functions and data that
do not have one of the <code>lower</code>, <code>upper</code>, <code>either</code> or
<code>section</code> attributes.  Possible values are <code>lower</code>,
<code>upper</code>, <code>either</code> or <code>any</code>.  The first three behave
like the corresponding attribute.  The fourth possible value -
<code>any</code> - is the default.  It leaves placement entirely up to the
linker script and how it assigns the standard sections
(<code>.text</code>, <code>.data</code>, etc) to the memory regions.
</p>
</dd>
<dt><code>-msilicon-errata=</code></dt>
<dd><a name="index-msilicon_002derrata"></a>
<p>This option passes on a request to assembler to enable the fixes for
the named silicon errata.
</p>
</dd>
<dt><code>-msilicon-errata-warn=</code></dt>
<dd><a name="index-msilicon_002derrata_002dwarn"></a>
<p>This option passes on a request to the assembler to enable warning
messages when a silicon errata might need to be applied.
</p>
</dd>
</dl>

<hr>
<div class="header">
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