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<title>Z80 Options - Using as</title>
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2015 Free Software Foundation, Inc.
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<a name="Z80-Options"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Z80-Syntax.html#Z80-Syntax">Z80 Syntax</a>,
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Up: <a rel="up" accesskey="u" href="Z80_002dDependent.html#Z80_002dDependent">Z80-Dependent</a>
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<hr>
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</div>
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<h4 class="subsection">9.53.1 Options</h4>
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<p><a name="index-Z80-options-2500"></a><a name="index-options-for-Z80-2501"></a>The Zilog Z80 and Ascii R800 version of <code>as</code> have a few machine
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dependent options.
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<a name="index-g_t_0040code_007b_002dz80_007d-command-line-option_002c-Z80-2502"></a>
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<dl><dt><samp><span class="option">-z80</span></samp><dd>Produce code for the Z80 processor. There are additional options to
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request warnings and error messages for undocumented instructions.
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<br><dt><samp><span class="option">-ignore-undocumented-instructions</span></samp><dt><samp><span class="option">-Wnud</span></samp><dd>Silently assemble undocumented Z80-instructions that have been adopted
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as documented R800-instructions.
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<br><dt><samp><span class="option">-ignore-unportable-instructions</span></samp><dt><samp><span class="option">-Wnup</span></samp><dd>Silently assemble all undocumented Z80-instructions.
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<br><dt><samp><span class="option">-warn-undocumented-instructions</span></samp><dt><samp><span class="option">-Wud</span></samp><dd>Issue warnings for undocumented Z80-instructions that work on R800, do
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not assemble other undocumented instructions without warning.
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<br><dt><samp><span class="option">-warn-unportable-instructions</span></samp><dt><samp><span class="option">-Wup</span></samp><dd>Issue warnings for other undocumented Z80-instructions, do not treat any
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undocumented instructions as errors.
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<br><dt><samp><span class="option">-forbid-undocumented-instructions</span></samp><dt><samp><span class="option">-Fud</span></samp><dd>Treat all undocumented z80-instructions as errors.
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<br><dt><samp><span class="option">-forbid-unportable-instructions</span></samp><dt><samp><span class="option">-Fup</span></samp><dd>Treat undocumented z80-instructions that do not work on R800 as errors.
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<p><a name="index-g_t_0040code_007b_002dr800_007d-command-line-option_002c-Z80-2503"></a><br><dt><samp><span class="option">-r800</span></samp><dd>Produce code for the R800 processor. The assembler does not support
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undocumented instructions for the R800.
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In line with common practice, <code>as</code> uses Z80 instruction names
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for the R800 processor, as far as they exist.
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</dl>
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<p><a name="index-Z80-Syntax-2504"></a>
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</body></html>
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