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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<a name="ARM-Options"></a>
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<div class="header">
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<p>
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Next: <a href="ARM-Syntax.html#ARM-Syntax" accesskey="n" rel="next">ARM Syntax</a>, Up: <a href="ARM_002dDependent.html#ARM_002dDependent" accesskey="u" rel="up">ARM-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Options-3"></a>
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<h4 class="subsection">9.4.1 Options</h4>
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<a name="index-ARM-options-_0028none_0029"></a>
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<a name="index-options-for-ARM-_0028none_0029"></a>
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<dl compact="compact">
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<dd>
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<a name="index-_002dmcpu_003d-command_002dline-option_002c-ARM"></a>
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</dd>
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<dt><code>-mcpu=<var>processor</var>[+<var>extension</var>…]</code></dt>
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<dd><p>This option specifies the target processor. The assembler will issue an
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error message if an attempt is made to assemble an instruction which
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will not execute on the target processor. The following processor names are
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recognized:
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<code>arm1</code>,
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<code>arm2</code>,
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<code>arm250</code>,
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<code>arm3</code>,
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<code>arm6</code>,
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<code>arm60</code>,
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<code>arm600</code>,
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<code>arm610</code>,
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<code>arm620</code>,
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<code>arm7</code>,
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<code>arm7m</code>,
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<code>arm7d</code>,
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<code>arm7dm</code>,
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<code>arm7di</code>,
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<code>arm7dmi</code>,
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<code>arm70</code>,
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<code>arm700</code>,
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<code>arm700i</code>,
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<code>arm710</code>,
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<code>arm710t</code>,
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<code>arm720</code>,
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<code>arm720t</code>,
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<code>arm740t</code>,
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<code>arm710c</code>,
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<code>arm7100</code>,
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<code>arm7500</code>,
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<code>arm7500fe</code>,
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<code>arm7t</code>,
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<code>arm7tdmi</code>,
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<code>arm7tdmi-s</code>,
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<code>arm8</code>,
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<code>arm810</code>,
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<code>strongarm</code>,
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<code>strongarm1</code>,
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<code>strongarm110</code>,
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<code>strongarm1100</code>,
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<code>strongarm1110</code>,
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<code>arm9</code>,
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<code>arm920</code>,
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<code>arm920t</code>,
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<code>arm922t</code>,
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<code>arm940t</code>,
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<code>arm9tdmi</code>,
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<code>fa526</code> (Faraday FA526 processor),
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<code>fa626</code> (Faraday FA626 processor),
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<code>arm9e</code>,
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<code>arm926e</code>,
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<code>arm926ej-s</code>,
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<code>arm946e-r0</code>,
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<code>arm946e</code>,
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<code>arm946e-s</code>,
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<code>arm966e-r0</code>,
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<code>arm966e</code>,
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<code>arm966e-s</code>,
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<code>arm968e-s</code>,
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<code>arm10t</code>,
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<code>arm10tdmi</code>,
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<code>arm10e</code>,
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<code>arm1020</code>,
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<code>arm1020t</code>,
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<code>arm1020e</code>,
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<code>arm1022e</code>,
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<code>arm1026ej-s</code>,
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<code>fa606te</code> (Faraday FA606TE processor),
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<code>fa616te</code> (Faraday FA616TE processor),
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<code>fa626te</code> (Faraday FA626TE processor),
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<code>fmp626</code> (Faraday FMP626 processor),
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<code>fa726te</code> (Faraday FA726TE processor),
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<code>arm1136j-s</code>,
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<code>arm1136jf-s</code>,
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<code>arm1156t2-s</code>,
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<code>arm1156t2f-s</code>,
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<code>arm1176jz-s</code>,
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<code>arm1176jzf-s</code>,
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<code>mpcore</code>,
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<code>mpcorenovfp</code>,
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<code>cortex-a5</code>,
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<code>cortex-a7</code>,
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<code>cortex-a8</code>,
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<code>cortex-a9</code>,
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<code>cortex-a15</code>,
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<code>cortex-a17</code>,
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<code>cortex-a32</code>,
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<code>cortex-a35</code>,
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<code>cortex-a53</code>,
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<code>cortex-a55</code>,
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<code>cortex-a57</code>,
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<code>cortex-a72</code>,
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<code>cortex-a73</code>,
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<code>cortex-a75</code>,
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<code>cortex-a76</code>,
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<code>ares</code>,
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<code>cortex-r4</code>,
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<code>cortex-r4f</code>,
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<code>cortex-r5</code>,
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<code>cortex-r7</code>,
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<code>cortex-r8</code>,
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<code>cortex-r52</code>,
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<code>cortex-m33</code>,
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<code>cortex-m23</code>,
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<code>cortex-m7</code>,
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<code>cortex-m4</code>,
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<code>cortex-m3</code>,
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<code>cortex-m1</code>,
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<code>cortex-m0</code>,
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<code>cortex-m0plus</code>,
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<code>exynos-m1</code>,
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<code>marvell-pj4</code>,
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<code>marvell-whitney</code>,
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<code>xgene1</code>,
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<code>xgene2</code>,
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<code>ep9312</code> (ARM920 with Cirrus Maverick coprocessor),
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<code>i80200</code> (Intel XScale processor)
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<code>iwmmxt</code> (Intel(r) XScale processor with Wireless MMX(tm) technology coprocessor)
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and
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<code>xscale</code>.
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The special name <code>all</code> may be used to allow the
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assembler to accept instructions valid for any ARM processor.
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</p>
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<p>In addition to the basic instruction set, the assembler can be told to
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accept various extension mnemonics that extend the processor using the
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co-processor instruction space. For example, <code>-mcpu=arm920+maverick</code>
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is equivalent to specifying <code>-mcpu=ep9312</code>.
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</p>
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<p>Multiple extensions may be specified, separated by a <code>+</code>. The
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extensions should be specified in ascending alphabetical order.
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</p>
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<p>Some extensions may be restricted to particular architectures; this is
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documented in the list of extensions below.
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</p>
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<p>Extension mnemonics may also be removed from those the assembler accepts.
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This is done be prepending <code>no</code> to the option that adds the extension.
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Extensions that are removed should be listed after all extensions which have
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been added, again in ascending alphabetical order. For example,
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<code>-mcpu=ep9312+nomaverick</code> is equivalent to specifying <code>-mcpu=arm920</code>.
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</p>
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<p>The following extensions are currently supported:
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<code>crc</code>
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<code>crypto</code> (Cryptography Extensions for v8-A architecture, implies <code>fp+simd</code>),
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<code>dotprod</code> (Dot Product Extensions for v8.2-A architecture, implies <code>fp+simd</code>),
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<code>fp</code> (Floating Point Extensions for v8-A architecture),
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<code>fp16</code> (FP16 Extensions for v8.2-A architecture, implies <code>fp</code>),
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<code>fp16fml</code> (FP16 Floating Point Multiplication Variant Extensions for v8.2-A architecture, implies <code>fp16</code>),
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<code>idiv</code> (Integer Divide Extensions for v7-A and v7-R architectures),
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<code>iwmmxt</code>,
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<code>iwmmxt2</code>,
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<code>xscale</code>,
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<code>maverick</code>,
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<code>mp</code> (Multiprocessing Extensions for v7-A and v7-R
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architectures),
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<code>os</code> (Operating System for v6M architecture),
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<code>predres</code> (Execution and Data Prediction Restriction Instruction for
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v8-A architectures, added by default from v8.5-A),
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<code>sb</code> (Speculation Barrier Instruction for v8-A architectures, added by
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default from v8.5-A),
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<code>sec</code> (Security Extensions for v6K and v7-A architectures),
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<code>simd</code> (Advanced SIMD Extensions for v8-A architecture, implies <code>fp</code>),
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<code>virt</code> (Virtualization Extensions for v7-A architecture, implies
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<code>idiv</code>),
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<code>pan</code> (Privileged Access Never Extensions for v8-A architecture),
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<code>ras</code> (Reliability, Availability and Serviceability extensions
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for v8-A architecture),
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<code>rdma</code> (ARMv8.1 Advanced SIMD extensions for v8-A architecture, implies
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<code>simd</code>)
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and
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<code>xscale</code>.
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</p>
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<a name="index-_002dmarch_003d-command_002dline-option_002c-ARM"></a>
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</dd>
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<dt><code>-march=<var>architecture</var>[+<var>extension</var>…]</code></dt>
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<dd><p>This option specifies the target architecture. The assembler will issue
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an error message if an attempt is made to assemble an instruction which
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will not execute on the target architecture. The following architecture
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names are recognized:
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<code>armv1</code>,
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<code>armv2</code>,
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<code>armv2a</code>,
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<code>armv2s</code>,
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<code>armv3</code>,
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<code>armv3m</code>,
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<code>armv4</code>,
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<code>armv4xm</code>,
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<code>armv4t</code>,
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<code>armv4txm</code>,
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<code>armv5</code>,
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<code>armv5t</code>,
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<code>armv5txm</code>,
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<code>armv5te</code>,
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<code>armv5texp</code>,
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<code>armv6</code>,
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<code>armv6j</code>,
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<code>armv6k</code>,
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<code>armv6z</code>,
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<code>armv6kz</code>,
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<code>armv6-m</code>,
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<code>armv6s-m</code>,
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<code>armv7</code>,
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<code>armv7-a</code>,
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<code>armv7ve</code>,
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<code>armv7-r</code>,
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<code>armv7-m</code>,
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<code>armv7e-m</code>,
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<code>armv8-a</code>,
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<code>armv8.1-a</code>,
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<code>armv8.2-a</code>,
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<code>armv8.3-a</code>,
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<code>armv8-r</code>,
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<code>armv8.4-a</code>,
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<code>armv8.5-a</code>,
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<code>iwmmxt</code>
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<code>iwmmxt2</code>
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and
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<code>xscale</code>.
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If both <code>-mcpu</code> and
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<code>-march</code> are specified, the assembler will use
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the setting for <code>-mcpu</code>.
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</p>
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<p>The architecture option can be extended with the same instruction set
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extension options as the <code>-mcpu</code> option.
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</p>
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<a name="index-_002dmfpu_003d-command_002dline-option_002c-ARM"></a>
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</dd>
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<dt><code>-mfpu=<var>floating-point-format</var></code></dt>
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<dd>
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<p>This option specifies the floating point format to assemble for. The
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assembler will issue an error message if an attempt is made to assemble
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an instruction which will not execute on the target floating point unit.
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The following format options are recognized:
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<code>softfpa</code>,
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<code>fpe</code>,
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<code>fpe2</code>,
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<code>fpe3</code>,
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<code>fpa</code>,
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<code>fpa10</code>,
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<code>fpa11</code>,
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<code>arm7500fe</code>,
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<code>softvfp</code>,
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<code>softvfp+vfp</code>,
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<code>vfp</code>,
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<code>vfp10</code>,
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<code>vfp10-r0</code>,
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<code>vfp9</code>,
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<code>vfpxd</code>,
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<code>vfpv2</code>,
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<code>vfpv3</code>,
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<code>vfpv3-fp16</code>,
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<code>vfpv3-d16</code>,
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<code>vfpv3-d16-fp16</code>,
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<code>vfpv3xd</code>,
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<code>vfpv3xd-d16</code>,
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<code>vfpv4</code>,
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<code>vfpv4-d16</code>,
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<code>fpv4-sp-d16</code>,
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<code>fpv5-sp-d16</code>,
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<code>fpv5-d16</code>,
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<code>fp-armv8</code>,
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<code>arm1020t</code>,
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<code>arm1020e</code>,
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<code>arm1136jf-s</code>,
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<code>maverick</code>,
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<code>neon</code>,
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<code>neon-vfpv3</code>,
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<code>neon-fp16</code>,
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<code>neon-vfpv4</code>,
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<code>neon-fp-armv8</code>,
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<code>crypto-neon-fp-armv8</code>,
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<code>neon-fp-armv8.1</code>
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and
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<code>crypto-neon-fp-armv8.1</code>.
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</p>
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<p>In addition to determining which instructions are assembled, this option
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also affects the way in which the <code>.double</code> assembler directive behaves
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when assembling little-endian code.
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</p>
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<p>The default is dependent on the processor selected. For Architecture 5 or
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later, the default is to assemble for VFP instructions; for earlier
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architectures the default is to assemble for FPA instructions.
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</p>
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<a name="index-_002dmthumb-command_002dline-option_002c-ARM"></a>
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</dd>
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<dt><code>-mthumb</code></dt>
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<dd><p>This option specifies that the assembler should start assembling Thumb
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instructions; that is, it should behave as though the file starts with a
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<code>.code 16</code> directive.
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</p>
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<a name="index-_002dmthumb_002dinterwork-command_002dline-option_002c-ARM"></a>
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</dd>
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<dt><code>-mthumb-interwork</code></dt>
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<dd><p>This option specifies that the output generated by the assembler should
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be marked as supporting interworking. It also affects the behaviour
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of the <code>ADR</code> and <code>ADRL</code> pseudo opcodes.
|
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</p>
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|
<a name="index-_002dmimplicit_002dit-command_002dline-option_002c-ARM"></a>
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</dd>
|
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<dt><code>-mimplicit-it=never</code></dt>
|
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<dt><code>-mimplicit-it=always</code></dt>
|
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<dt><code>-mimplicit-it=arm</code></dt>
|
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<dt><code>-mimplicit-it=thumb</code></dt>
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<dd><p>The <code>-mimplicit-it</code> option controls the behavior of the assembler when
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conditional instructions are not enclosed in IT blocks.
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There are four possible behaviors.
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If <code>never</code> is specified, such constructs cause a warning in ARM
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code and an error in Thumb-2 code.
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If <code>always</code> is specified, such constructs are accepted in both
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ARM and Thumb-2 code, where the IT instruction is added implicitly.
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If <code>arm</code> is specified, such constructs are accepted in ARM code
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and cause an error in Thumb-2 code.
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If <code>thumb</code> is specified, such constructs cause a warning in ARM
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code and are accepted in Thumb-2 code. If you omit this option, the
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behavior is equivalent to <code>-mimplicit-it=arm</code>.
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</p>
|
|
<a name="index-_002dmapcs_002d26-command_002dline-option_002c-ARM"></a>
|
|
<a name="index-_002dmapcs_002d32-command_002dline-option_002c-ARM"></a>
|
|
</dd>
|
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<dt><code>-mapcs-26</code></dt>
|
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<dt><code>-mapcs-32</code></dt>
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<dd><p>These options specify that the output generated by the assembler should
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|
be marked as supporting the indicated version of the Arm Procedure.
|
|
Calling Standard.
|
|
</p>
|
|
<a name="index-_002dmatpcs-command_002dline-option_002c-ARM"></a>
|
|
</dd>
|
|
<dt><code>-matpcs</code></dt>
|
|
<dd><p>This option specifies that the output generated by the assembler should
|
|
be marked as supporting the Arm/Thumb Procedure Calling Standard. If
|
|
enabled this option will cause the assembler to create an empty
|
|
debugging section in the object file called .arm.atpcs. Debuggers can
|
|
use this to determine the ABI being used by.
|
|
</p>
|
|
<a name="index-_002dmapcs_002dfloat-command_002dline-option_002c-ARM"></a>
|
|
</dd>
|
|
<dt><code>-mapcs-float</code></dt>
|
|
<dd><p>This indicates the floating point variant of the APCS should be
|
|
used. In this variant floating point arguments are passed in FP
|
|
registers rather than integer registers.
|
|
</p>
|
|
<a name="index-_002dmapcs_002dreentrant-command_002dline-option_002c-ARM"></a>
|
|
</dd>
|
|
<dt><code>-mapcs-reentrant</code></dt>
|
|
<dd><p>This indicates that the reentrant variant of the APCS should be used.
|
|
This variant supports position independent code.
|
|
</p>
|
|
<a name="index-_002dmfloat_002dabi_003d-command_002dline-option_002c-ARM"></a>
|
|
</dd>
|
|
<dt><code>-mfloat-abi=<var>abi</var></code></dt>
|
|
<dd><p>This option specifies that the output generated by the assembler should be
|
|
marked as using specified floating point ABI.
|
|
The following values are recognized:
|
|
<code>soft</code>,
|
|
<code>softfp</code>
|
|
and
|
|
<code>hard</code>.
|
|
</p>
|
|
<a name="index-_002deabi_003d-command_002dline-option_002c-ARM"></a>
|
|
</dd>
|
|
<dt><code>-meabi=<var>ver</var></code></dt>
|
|
<dd><p>This option specifies which EABI version the produced object files should
|
|
conform to.
|
|
The following values are recognized:
|
|
<code>gnu</code>,
|
|
<code>4</code>
|
|
and
|
|
<code>5</code>.
|
|
</p>
|
|
<a name="index-_002dEB-command_002dline-option_002c-ARM"></a>
|
|
</dd>
|
|
<dt><code>-EB</code></dt>
|
|
<dd><p>This option specifies that the output generated by the assembler should
|
|
be marked as being encoded for a big-endian processor.
|
|
</p>
|
|
<p>Note: If a program is being built for a system with big-endian data
|
|
and little-endian instructions then it should be assembled with the
|
|
<samp>-EB</samp> option, (all of it, code and data) and then linked with
|
|
the <samp>--be8</samp> option. This will reverse the endianness of the
|
|
instructions back to little-endian, but leave the data as big-endian.
|
|
</p>
|
|
<a name="index-_002dEL-command_002dline-option_002c-ARM"></a>
|
|
</dd>
|
|
<dt><code>-EL</code></dt>
|
|
<dd><p>This option specifies that the output generated by the assembler should
|
|
be marked as being encoded for a little-endian processor.
|
|
</p>
|
|
<a name="index-_002dk-command_002dline-option_002c-ARM"></a>
|
|
<a name="index-PIC-code-generation-for-ARM"></a>
|
|
</dd>
|
|
<dt><code>-k</code></dt>
|
|
<dd><p>This option specifies that the output of the assembler should be marked
|
|
as position-independent code (PIC).
|
|
</p>
|
|
<a name="index-_002d_002dfix_002dv4bx-command_002dline-option_002c-ARM"></a>
|
|
</dd>
|
|
<dt><code>--fix-v4bx</code></dt>
|
|
<dd><p>Allow <code>BX</code> instructions in ARMv4 code. This is intended for use with
|
|
the linker option of the same name.
|
|
</p>
|
|
<a name="index-_002dmwarn_002ddeprecated-command_002dline-option_002c-ARM"></a>
|
|
</dd>
|
|
<dt><code>-mwarn-deprecated</code></dt>
|
|
<dt><code>-mno-warn-deprecated</code></dt>
|
|
<dd><p>Enable or disable warnings about using deprecated options or
|
|
features. The default is to warn.
|
|
</p>
|
|
<a name="index-_002dmccs-command_002dline-option_002c-ARM"></a>
|
|
</dd>
|
|
<dt><code>-mccs</code></dt>
|
|
<dd><p>Turns on CodeComposer Studio assembly syntax compatibility mode.
|
|
</p>
|
|
<a name="index-_002dmwarn_002dsyms-command_002dline-option_002c-ARM"></a>
|
|
</dd>
|
|
<dt><code>-mwarn-syms</code></dt>
|
|
<dt><code>-mno-warn-syms</code></dt>
|
|
<dd><p>Enable or disable warnings about symbols that match the names of ARM
|
|
instructions. The default is to warn.
|
|
</p>
|
|
</dd>
|
|
</dl>
|
|
|
|
|
|
<hr>
|
|
<div class="header">
|
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<p>
|
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Next: <a href="ARM-Syntax.html#ARM-Syntax" accesskey="n" rel="next">ARM Syntax</a>, Up: <a href="ARM_002dDependent.html#ARM_002dDependent" accesskey="u" rel="up">ARM-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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