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| <a name="MSP430-Options-1"></a> |
| <h4 class="subsection">3.17.31 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 <code>__</code>. This in turn will be used by the |
| <code>msp430.h</code> header file to select an MCU specific supplimentary |
| 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 <code>msp430</code> can also be |
| used to select the 430 ISA. Similarly the generic <code>msp430x</code> MCU |
| name will select the 430X ISA. |
| </p> |
| <p>In addition an MCU specific linker script will be added to the linker |
| command line. The script’s name is the name of the MCU with |
| <code>.ld</code> appended. Thus specifying <samp>-mmcu=xxx</samp> on the gcc |
| command line will define 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>-mcpu=</code></dt> |
| <dd><a name="index-_002dmcpu_003d"></a> |
| <p>Specifies the ISA to use. Accepted values are <code>msp430</code>, |
| <code>msp430x</code> and <code>msp430xv2</code>. 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-5"></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 <code>none</code> for no hardware multiply, <code>16bit</code> |
| for the original 16-bit-only multiply supported by early MCUs. |
| <code>32bit</code> for the 16/32-bit multiply supported by later MCUs and |
| <code>f5series</code> for the 16/32-bit multiply supported by F5-series MCUs. |
| A value of <code>auto</code> 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 then |
| <code>32bit</code> 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 |
| <code>-O3</code> 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 will include special symbols in some objects |
| that tell the linker and runtime which code fragments are required. |
| </p> |
| </dd> |
| </dl> |
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