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<p>
Next:&nbsp;<a rel="next" accesskey="n" href="Invoking.html#Invoking">Invoking</a>,
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<h2 class="chapter">1 Overview</h2>
<p><a name="index-invocation-summary-1"></a><a name="index-option-summary-2"></a><a name="index-summary-of-options-3"></a>Here is a brief summary of how to invoke <samp><span class="command">as</span></samp>. For details,
see <a href="Invoking.html#Invoking">Command-Line Options</a>.
<!-- man title AS the portable GNU assembler. -->
<!-- We don't use deffn and friends for the following because they seem -->
<!-- to be limited to one line for the header. -->
<pre class="smallexample"> <!-- man begin SYNOPSIS -->
as [<b>-a</b>[<b>cdghlns</b>][=<var>file</var>]] [<b>--alternate</b>] [<b>-D</b>]
[<b>--debug-prefix-map</b> <var>old</var>=<var>new</var>]
[<b>--defsym</b> <var>sym</var>=<var>val</var>] [<b>-f</b>] [<b>-g</b>] [<b>--gstabs</b>]
[<b>--gstabs+</b>] [<b>--gdwarf-2</b>] [<b>--help</b>] [<b>-I</b> <var>dir</var>] [<b>-J</b>]
[<b>-K</b>] [<b>-L</b>] [<b>--listing-lhs-width</b>=<var>NUM</var>]
[<b>--listing-lhs-width2</b>=<var>NUM</var>] [<b>--listing-rhs-width</b>=<var>NUM</var>]
[<b>--listing-cont-lines</b>=<var>NUM</var>] [<b>--keep-locals</b>] [<b>-o</b>
<var>objfile</var>] [<b>-R</b>] [<b>--reduce-memory-overheads</b>] [<b>--statistics</b>]
[<b>-v</b>] [<b>-version</b>] [<b>--version</b>] [<b>-W</b>] [<b>--warn</b>]
[<b>--fatal-warnings</b>] [<b>-w</b>] [<b>-x</b>] [<b>-Z</b>] [<b>@</b><var>FILE</var>]
[<b>--target-help</b>] [<var>target-options</var>]
[<b>--</b>|<var>files</var> ...]
<!-- Target dependent options are listed below. Keep the list sorted. -->
<!-- Add an empty line for separation. -->
<em>Target Alpha options:</em>
[<b>-m</b><var>cpu</var>]
[<b>-mdebug</b> | <b>-no-mdebug</b>]
[<b>-replace</b> | <b>-noreplace</b>]
[<b>-relax</b>] [<b>-g</b>] [<b>-G</b><var>size</var>]
[<b>-F</b>] [<b>-32addr</b>]
<em>Target ARC options:</em>
[<b>-marc[5|6|7|8]</b>]
[<b>-EB</b>|<b>-EL</b>]
<em>Target ARM options:</em>
<!-- Don't document the deprecated options -->
[<b>-mcpu</b>=<var>processor</var>[+<var>extension</var>...]]
[<b>-march</b>=<var>architecture</var>[+<var>extension</var>...]]
[<b>-mfpu</b>=<var>floating-point-format</var>]
[<b>-mfloat-abi</b>=<var>abi</var>]
[<b>-meabi</b>=<var>ver</var>]
[<b>-mthumb</b>]
[<b>-EB</b>|<b>-EL</b>]
[<b>-mapcs-32</b>|<b>-mapcs-26</b>|<b>-mapcs-float</b>|
<b>-mapcs-reentrant</b>]
[<b>-mthumb-interwork</b>] [<b>-k</b>]
<em>Target Blackfin options:</em>
[<b>-mcpu</b>=<var>processor</var>[-<var>sirevision</var>]]
[<b>-mfdpic</b>]
[<b>-mno-fdpic</b>]
[<b>-mnopic</b>]
<em>Target CRIS options:</em>
[<b>--underscore</b> | <b>--no-underscore</b>]
[<b>--pic</b>] [<b>-N</b>]
[<b>--emulation=criself</b> | <b>--emulation=crisaout</b>]
[<b>--march=v0_v10</b> | <b>--march=v10</b> | <b>--march=v32</b> | <b>--march=common_v10_v32</b>]
<!-- Deprecated - deliberately not documented. -->
<!-- [@b{-h}] [@b{-H}] -->
<em>Target D10V options:</em>
[<b>-O</b>]
<em>Target D30V options:</em>
[<b>-O</b>|<b>-n</b>|<b>-N</b>]
<em>Target H8/300 options:</em>
[-h-tick-hex]
<!-- HPPA has no machine-dependent assembler options (yet). -->
<em>Target i386 options:</em>
[<b>--32</b>|<b>--64</b>] [<b>-n</b>]
[<b>-march</b>=<var>CPU</var>[+<var>EXTENSION</var>...]] [<b>-mtune</b>=<var>CPU</var>]
<em>Target i960 options:</em>
<!-- see md_parse_option in tc-i960.c -->
[<b>-ACA</b>|<b>-ACA_A</b>|<b>-ACB</b>|<b>-ACC</b>|<b>-AKA</b>|<b>-AKB</b>|
<b>-AKC</b>|<b>-AMC</b>]
[<b>-b</b>] [<b>-no-relax</b>]
<em>Target IA-64 options:</em>
[<b>-mconstant-gp</b>|<b>-mauto-pic</b>]
[<b>-milp32</b>|<b>-milp64</b>|<b>-mlp64</b>|<b>-mp64</b>]
[<b>-mle</b>|<b>mbe</b>]
[<b>-mtune=itanium1</b>|<b>-mtune=itanium2</b>]
[<b>-munwind-check=warning</b>|<b>-munwind-check=error</b>]
[<b>-mhint.b=ok</b>|<b>-mhint.b=warning</b>|<b>-mhint.b=error</b>]
[<b>-x</b>|<b>-xexplicit</b>] [<b>-xauto</b>] [<b>-xdebug</b>]
<em>Target IP2K options:</em>
[<b>-mip2022</b>|<b>-mip2022ext</b>]
<em>Target M32C options:</em>
[<b>-m32c</b>|<b>-m16c</b>] [-relax] [-h-tick-hex]
<em>Target M32R options:</em>
[<b>--m32rx</b>|<b>--[no-]warn-explicit-parallel-conflicts</b>|
<b>--W[n]p</b>]
<em>Target M680X0 options:</em>
[<b>-l</b>] [<b>-m68000</b>|<b>-m68010</b>|<b>-m68020</b>|...]
<em>Target M68HC11 options:</em>
[<b>-m68hc11</b>|<b>-m68hc12</b>|<b>-m68hcs12</b>]
[<b>-mshort</b>|<b>-mlong</b>]
[<b>-mshort-double</b>|<b>-mlong-double</b>]
[<b>--force-long-branches</b>] [<b>--short-branches</b>]
[<b>--strict-direct-mode</b>] [<b>--print-insn-syntax</b>]
[<b>--print-opcodes</b>] [<b>--generate-example</b>]
<em>Target MCORE options:</em>
[<b>-jsri2bsr</b>] [<b>-sifilter</b>] [<b>-relax</b>]
[<b>-mcpu=[210|340]</b>]
<em>Target MICROBLAZE options:</em>
<!-- MicroBlaze has no machine-dependent assembler options. -->
<em>Target MIPS options:</em>
[<b>-nocpp</b>] [<b>-EL</b>] [<b>-EB</b>] [<b>-O</b>[<var>optimization level</var>]]
[<b>-g</b>[<var>debug level</var>]] [<b>-G</b> <var>num</var>] [<b>-KPIC</b>] [<b>-call_shared</b>]
[<b>-non_shared</b>] [<b>-xgot</b> [<b>-mvxworks-pic</b>]
[<b>-mabi</b>=<var>ABI</var>] [<b>-32</b>] [<b>-n32</b>] [<b>-64</b>] [<b>-mfp32</b>] [<b>-mgp32</b>]
[<b>-march</b>=<var>CPU</var>] [<b>-mtune</b>=<var>CPU</var>] [<b>-mips1</b>] [<b>-mips2</b>]
[<b>-mips3</b>] [<b>-mips4</b>] [<b>-mips5</b>] [<b>-mips32</b>] [<b>-mips32r2</b>]
[<b>-mips64</b>] [<b>-mips64r2</b>]
[<b>-construct-floats</b>] [<b>-no-construct-floats</b>]
[<b>-trap</b>] [<b>-no-break</b>] [<b>-break</b>] [<b>-no-trap</b>]
[<b>-mips16</b>] [<b>-no-mips16</b>]
[<b>-mmicromips</b>] [<b>-mno-micromips</b>]
[<b>-msmartmips</b>] [<b>-mno-smartmips</b>]
[<b>-mips3d</b>] [<b>-no-mips3d</b>]
[<b>-mdmx</b>] [<b>-no-mdmx</b>]
[<b>-mdsp</b>] [<b>-mno-dsp</b>]
[<b>-mdspr2</b>] [<b>-mno-dspr2</b>]
[<b>-mmt</b>] [<b>-mno-mt</b>]
[<b>-mmcu</b>] [<b>-mno-mcu</b>]
[<b>-mfix7000</b>] [<b>-mno-fix7000</b>]
[<b>-mfix-vr4120</b>] [<b>-mno-fix-vr4120</b>]
[<b>-mfix-vr4130</b>] [<b>-mno-fix-vr4130</b>]
[<b>-mdebug</b>] [<b>-no-mdebug</b>]
[<b>-mpdr</b>] [<b>-mno-pdr</b>]
<em>Target MMIX options:</em>
[<b>--fixed-special-register-names</b>] [<b>--globalize-symbols</b>]
[<b>--gnu-syntax</b>] [<b>--relax</b>] [<b>--no-predefined-symbols</b>]
[<b>--no-expand</b>] [<b>--no-merge-gregs</b>] [<b>-x</b>]
[<b>--linker-allocated-gregs</b>]
<em>Target PDP11 options:</em>
[<b>-mpic</b>|<b>-mno-pic</b>] [<b>-mall</b>] [<b>-mno-extensions</b>]
[<b>-m</b><var>extension</var>|<b>-mno-</b><var>extension</var>]
[<b>-m</b><var>cpu</var>] [<b>-m</b><var>machine</var>]
<em>Target picoJava options:</em>
[<b>-mb</b>|<b>-me</b>]
<em>Target PowerPC options:</em>
[<b>-mpwrx</b>|<b>-mpwr2</b>|<b>-mpwr</b>|<b>-m601</b>|<b>-mppc</b>|<b>-mppc32</b>|<b>-m603</b>|<b>-m604</b>|
<b>-m403</b>|<b>-m405</b>|<b>-mppc64</b>|<b>-m620</b>|<b>-mppc64bridge</b>|<b>-mbooke</b>]
[<b>-mcom</b>|<b>-many</b>|<b>-maltivec</b>|<b>-mvsx</b>] [<b>-memb</b>]
[<b>-mregnames</b>|<b>-mno-regnames</b>]
[<b>-mrelocatable</b>|<b>-mrelocatable-lib</b>]
[<b>-mlittle</b>|<b>-mlittle-endian</b>|<b>-mbig</b>|<b>-mbig-endian</b>]
[<b>-msolaris</b>|<b>-mno-solaris</b>]
<em>Target RX options:</em>
[<b>-mlittle-endian</b>|<b>-mbig-endian</b>]
[<b>-m32bit-ints</b>|<b>-m16bit-ints</b>]
[<b>-m32bit-doubles</b>|<b>-m64bit-doubles</b>]
<em>Target s390 options:</em>
[<b>-m31</b>|<b>-m64</b>] [<b>-mesa</b>|<b>-mzarch</b>] [<b>-march</b>=<var>CPU</var>]
[<b>-mregnames</b>|<b>-mno-regnames</b>]
[<b>-mwarn-areg-zero</b>]
<em>Target SCORE options:</em>
[<b>-EB</b>][<b>-EL</b>][<b>-FIXDD</b>][<b>-NWARN</b>]
[<b>-SCORE5</b>][<b>-SCORE5U</b>][<b>-SCORE7</b>][<b>-SCORE3</b>]
[<b>-march=score7</b>][<b>-march=score3</b>]
[<b>-USE_R1</b>][<b>-KPIC</b>][<b>-O0</b>][<b>-G</b> <var>num</var>][<b>-V</b>]
<em>Target SPARC options:</em>
<!-- The order here is important. See c-sparc.texi. -->
[<b>-Av6</b>|<b>-Av7</b>|<b>-Av8</b>|<b>-Asparclet</b>|<b>-Asparclite</b>
<b>-Av8plus</b>|<b>-Av8plusa</b>|<b>-Av9</b>|<b>-Av9a</b>]
[<b>-xarch=v8plus</b>|<b>-xarch=v8plusa</b>] [<b>-bump</b>]
[<b>-32</b>|<b>-64</b>]
<em>Target TIC54X options:</em>
[<b>-mcpu=54[123589]</b>|<b>-mcpu=54[56]lp</b>] [<b>-mfar-mode</b>|<b>-mf</b>]
[<b>-merrors-to-file</b> <var>&lt;filename&gt;</var>|<b>-me</b> <var>&lt;filename&gt;</var>]
<em>Target TIC6X options:</em>
[<b>-march=</b><var>arch</var>] [<b>-matomic</b>|<b>-mno-atomic</b>]
[<b>-mbig-endian</b>|<b>-mlittle-endian</b>] [<b>-mdsbt</b>|<b>-mno-dsbt</b>]
[<b>-mpid=no</b>|<b>-mpid=near</b>|<b>-mpid=far</b>] [<b>-mpic</b>|<b>-mno-pic</b>]
<em>Target Z80 options:</em>
[<b>-z80</b>] [<b>-r800</b>]
[<b> -ignore-undocumented-instructions</b>] [<b>-Wnud</b>]
[<b> -ignore-unportable-instructions</b>] [<b>-Wnup</b>]
[<b> -warn-undocumented-instructions</b>] [<b>-Wud</b>]
[<b> -warn-unportable-instructions</b>] [<b>-Wup</b>]
[<b> -forbid-undocumented-instructions</b>] [<b>-Fud</b>]
[<b> -forbid-unportable-instructions</b>] [<b>-Fup</b>]
<!-- Z8000 has no machine-dependent assembler options -->
<em>Target Xtensa options:</em>
[<b>--[no-]text-section-literals</b>] [<b>--[no-]absolute-literals</b>]
[<b>--[no-]target-align</b>] [<b>--[no-]longcalls</b>]
[<b>--[no-]transform</b>]
[<b>--rename-section</b> <var>oldname</var>=<var>newname</var>]
<!-- man end -->
</pre>
<!-- man begin OPTIONS -->
<dl>
<!-- This file is designed to be included in manuals that use -->
<!-- expandargv. -->
<dt><code>@</code><var>file</var><dd>Read command-line options from <var>file</var>. The options read are
inserted in place of the original @<var>file</var> option. If <var>file</var>
does not exist, or cannot be read, then the option will be treated
literally, and not removed.
<p>Options in <var>file</var> are separated by whitespace. A whitespace
character may be included in an option by surrounding the entire
option in either single or double quotes. Any character (including a
backslash) may be included by prefixing the character to be included
with a backslash. The <var>file</var> may itself contain additional
@<var>file</var> options; any such options will be processed recursively.
<br><dt><code>-a[cdghlmns]</code><dd>Turn on listings, in any of a variety of ways:
<dl>
<dt><code>-ac</code><dd>omit false conditionals
<br><dt><code>-ad</code><dd>omit debugging directives
<br><dt><code>-ag</code><dd>include general information, like as version and options passed
<br><dt><code>-ah</code><dd>include high-level source
<br><dt><code>-al</code><dd>include assembly
<br><dt><code>-am</code><dd>include macro expansions
<br><dt><code>-an</code><dd>omit forms processing
<br><dt><code>-as</code><dd>include symbols
<br><dt><code>=file</code><dd>set the name of the listing file
</dl>
<p>You may combine these options; for example, use &lsquo;<samp><span class="samp">-aln</span></samp>&rsquo; for assembly
listing without forms processing. The &lsquo;<samp><span class="samp">=file</span></samp>&rsquo; option, if used, must be
the last one. By itself, &lsquo;<samp><span class="samp">-a</span></samp>&rsquo; defaults to &lsquo;<samp><span class="samp">-ahls</span></samp>&rsquo;.
<br><dt><code>--alternate</code><dd>Begin in alternate macro mode.
See <a href="Altmacro.html#Altmacro"><code>.altmacro</code></a>.
<br><dt><code>-D</code><dd>Ignored. This option is accepted for script compatibility with calls to
other assemblers.
<br><dt><code>--debug-prefix-map </code><var>old</var><code>=</code><var>new</var><dd>When assembling files in directory <samp><var>old</var></samp>, record debugging
information describing them as in <samp><var>new</var></samp> instead.
<br><dt><code>--defsym </code><var>sym</var><code>=</code><var>value</var><dd>Define the symbol <var>sym</var> to be <var>value</var> before assembling the input file.
<var>value</var> must be an integer constant. As in C, a leading &lsquo;<samp><span class="samp">0x</span></samp>&rsquo;
indicates a hexadecimal value, and a leading &lsquo;<samp><span class="samp">0</span></samp>&rsquo; indicates an octal
value. The value of the symbol can be overridden inside a source file via the
use of a <code>.set</code> pseudo-op.
<br><dt><code>-f</code><dd>&ldquo;fast&rdquo;&mdash;skip whitespace and comment preprocessing (assume source is
compiler output).
<br><dt><code>-g</code><dt><code>--gen-debug</code><dd>Generate debugging information for each assembler source line using whichever
debug format is preferred by the target. This currently means either STABS,
ECOFF or DWARF2.
<br><dt><code>--gstabs</code><dd>Generate stabs debugging information for each assembler line. This
may help debugging assembler code, if the debugger can handle it.
<br><dt><code>--gstabs+</code><dd>Generate stabs debugging information for each assembler line, with GNU
extensions that probably only gdb can handle, and that could make other
debuggers crash or refuse to read your program. This
may help debugging assembler code. Currently the only GNU extension is
the location of the current working directory at assembling time.
<br><dt><code>--gdwarf-2</code><dd>Generate DWARF2 debugging information for each assembler line. This
may help debugging assembler code, if the debugger can handle it. Note&mdash;this
option is only supported by some targets, not all of them.
<br><dt><code>--help</code><dd>Print a summary of the command line options and exit.
<br><dt><code>--target-help</code><dd>Print a summary of all target specific options and exit.
<br><dt><code>-I </code><var>dir</var><dd>Add directory <var>dir</var> to the search list for <code>.include</code> directives.
<br><dt><code>-J</code><dd>Don't warn about signed overflow.
<br><dt><code>-K</code><dd>Issue warnings when difference tables altered for long displacements.
<br><dt><code>-L</code><dt><code>--keep-locals</code><dd>Keep (in the symbol table) local symbols. These symbols start with
system-specific local label prefixes, typically &lsquo;<samp><span class="samp">.L</span></samp>&rsquo; for ELF systems
or &lsquo;<samp><span class="samp">L</span></samp>&rsquo; for traditional a.out systems.
See <a href="Symbol-Names.html#Symbol-Names">Symbol Names</a>.
<br><dt><code>--listing-lhs-width=</code><var>number</var><dd>Set the maximum width, in words, of the output data column for an assembler
listing to <var>number</var>.
<br><dt><code>--listing-lhs-width2=</code><var>number</var><dd>Set the maximum width, in words, of the output data column for continuation
lines in an assembler listing to <var>number</var>.
<br><dt><code>--listing-rhs-width=</code><var>number</var><dd>Set the maximum width of an input source line, as displayed in a listing, to
<var>number</var> bytes.
<br><dt><code>--listing-cont-lines=</code><var>number</var><dd>Set the maximum number of lines printed in a listing for a single line of input
to <var>number</var> + 1.
<br><dt><code>-o </code><var>objfile</var><dd>Name the object-file output from <samp><span class="command">as</span></samp> <var>objfile</var>.
<br><dt><code>-R</code><dd>Fold the data section into the text section.
<p><a name="index-g_t_002d_002dhash_002dsize_003d_0040var_007bnumber_007d-4"></a>Set the default size of GAS's hash tables to a prime number close to
<var>number</var>. Increasing this value can reduce the length of time it takes the
assembler to perform its tasks, at the expense of increasing the assembler's
memory requirements. Similarly reducing this value can reduce the memory
requirements at the expense of speed.
<br><dt><code>--reduce-memory-overheads</code><dd>This option reduces GAS's memory requirements, at the expense of making the
assembly processes slower. Currently this switch is a synonym for
&lsquo;<samp><span class="samp">--hash-size=4051</span></samp>&rsquo;, but in the future it may have other effects as well.
<br><dt><code>--statistics</code><dd>Print the maximum space (in bytes) and total time (in seconds) used by
assembly.
<br><dt><code>--strip-local-absolute</code><dd>Remove local absolute symbols from the outgoing symbol table.
<br><dt><code>-v</code><dt><code>-version</code><dd>Print the <samp><span class="command">as</span></samp> version.
<br><dt><code>--version</code><dd>Print the <samp><span class="command">as</span></samp> version and exit.
<br><dt><code>-W</code><dt><code>--no-warn</code><dd>Suppress warning messages.
<br><dt><code>--fatal-warnings</code><dd>Treat warnings as errors.
<br><dt><code>--warn</code><dd>Don't suppress warning messages or treat them as errors.
<br><dt><code>-w</code><dd>Ignored.
<br><dt><code>-x</code><dd>Ignored.
<br><dt><code>-Z</code><dd>Generate an object file even after errors.
<br><dt><code>-- | </code><var>files</var><code> ...</code><dd>Standard input, or source files to assemble.
</dl>
<p>The following options are available when as is configured for
an ARC processor.
<dl>
<dt><code>-marc[5|6|7|8]</code><dd>This option selects the core processor variant.
<br><dt><code>-EB | -EL</code><dd>Select either big-endian (-EB) or little-endian (-EL) output.
</dl>
<p>The following options are available when as is configured for the ARM
processor family.
<dl>
<dt><code>-mcpu=</code><var>processor</var><code>[+</code><var>extension</var><code>...]</code><dd>Specify which ARM processor variant is the target.
<br><dt><code>-march=</code><var>architecture</var><code>[+</code><var>extension</var><code>...]</code><dd>Specify which ARM architecture variant is used by the target.
<br><dt><code>-mfpu=</code><var>floating-point-format</var><dd>Select which Floating Point architecture is the target.
<br><dt><code>-mfloat-abi=</code><var>abi</var><dd>Select which floating point ABI is in use.
<br><dt><code>-mthumb</code><dd>Enable Thumb only instruction decoding.
<br><dt><code>-mapcs-32 | -mapcs-26 | -mapcs-float | -mapcs-reentrant</code><dd>Select which procedure calling convention is in use.
<br><dt><code>-EB | -EL</code><dd>Select either big-endian (-EB) or little-endian (-EL) output.
<br><dt><code>-mthumb-interwork</code><dd>Specify that the code has been generated with interworking between Thumb and
ARM code in mind.
<br><dt><code>-k</code><dd>Specify that PIC code has been generated.
</dl>
<p>The following options are available when as is configured for
the Blackfin processor family.
<dl>
<dt><code>-mcpu=</code><var>processor</var><span class="roman">[</span><code>-</code><var>sirevision</var><span class="roman">]</span><dd>This option specifies the target processor. The optional <var>sirevision</var>
is not used in assembler.
<br><dt><code>-mfdpic</code><dd>Assemble for the FDPIC ABI.
<br><dt><code>-mno-fdpic</code><dt><code>-mnopic</code><dd>Disable -mfdpic.
</dl>
<p>See the info pages for documentation of the CRIS-specific options.
<p>The following options are available when as is configured for
a D10V processor.
<a name="index-D10V-optimization-5"></a>
<a name="index-optimization_002c-D10V-6"></a>
<dl><dt><code>-O</code><dd>Optimize output by parallelizing instructions.
</dl>
<p>The following options are available when as is configured for a D30V
processor.
<a name="index-D30V-optimization-7"></a>
<a name="index-optimization_002c-D30V-8"></a>
<dl><dt><code>-O</code><dd>Optimize output by parallelizing instructions.
<p><a name="index-D30V-nops-9"></a><br><dt><code>-n</code><dd>Warn when nops are generated.
<p><a name="index-D30V-nops-after-32_002dbit-multiply-10"></a><br><dt><code>-N</code><dd>Warn when a nop after a 32-bit multiply instruction is generated.
</dl>
<p>The following options are available when as is configured for the
Intel 80960 processor.
<dl>
<dt><code>-ACA | -ACA_A | -ACB | -ACC | -AKA | -AKB | -AKC | -AMC</code><dd>Specify which variant of the 960 architecture is the target.
<br><dt><code>-b</code><dd>Add code to collect statistics about branches taken.
<br><dt><code>-no-relax</code><dd>Do not alter compare-and-branch instructions for long displacements;
error if necessary.
</dl>
<p>The following options are available when as is configured for the
Ubicom IP2K series.
<dl>
<dt><code>-mip2022ext</code><dd>Specifies that the extended IP2022 instructions are allowed.
<br><dt><code>-mip2022</code><dd>Restores the default behaviour, which restricts the permitted instructions to
just the basic IP2022 ones.
</dl>
<p>The following options are available when as is configured for the
Renesas M32C and M16C processors.
<dl>
<dt><code>-m32c</code><dd>Assemble M32C instructions.
<br><dt><code>-m16c</code><dd>Assemble M16C instructions (the default).
<br><dt><code>-relax</code><dd>Enable support for link-time relaxations.
<br><dt><code>-h-tick-hex</code><dd>Support H'00 style hex constants in addition to 0x00 style.
</dl>
<p>The following options are available when as is configured for the
Renesas M32R (formerly Mitsubishi M32R) series.
<dl>
<dt><code>--m32rx</code><dd>Specify which processor in the M32R family is the target. The default
is normally the M32R, but this option changes it to the M32RX.
<br><dt><code>--warn-explicit-parallel-conflicts or --Wp</code><dd>Produce warning messages when questionable parallel constructs are
encountered.
<br><dt><code>--no-warn-explicit-parallel-conflicts or --Wnp</code><dd>Do not produce warning messages when questionable parallel constructs are
encountered.
</dl>
<p>The following options are available when as is configured for the
Motorola 68000 series.
<dl>
<dt><code>-l</code><dd>Shorten references to undefined symbols, to one word instead of two.
<br><dt><code>-m68000 | -m68008 | -m68010 | -m68020 | -m68030</code><dt><code>| -m68040 | -m68060 | -m68302 | -m68331 | -m68332</code><dt><code>| -m68333 | -m68340 | -mcpu32 | -m5200</code><dd>Specify what processor in the 68000 family is the target. The default
is normally the 68020, but this can be changed at configuration time.
<br><dt><code>-m68881 | -m68882 | -mno-68881 | -mno-68882</code><dd>The target machine does (or does not) have a floating-point coprocessor.
The default is to assume a coprocessor for 68020, 68030, and cpu32. Although
the basic 68000 is not compatible with the 68881, a combination of the
two can be specified, since it's possible to do emulation of the
coprocessor instructions with the main processor.
<br><dt><code>-m68851 | -mno-68851</code><dd>The target machine does (or does not) have a memory-management
unit coprocessor. The default is to assume an MMU for 68020 and up.
</dl>
<p>For details about the PDP-11 machine dependent features options,
see <a href="PDP_002d11_002dOptions.html#PDP_002d11_002dOptions">PDP-11-Options</a>.
<dl>
<dt><code>-mpic | -mno-pic</code><dd>Generate position-independent (or position-dependent) code. The
default is <samp><span class="option">-mpic</span></samp>.
<br><dt><code>-mall</code><dt><code>-mall-extensions</code><dd>Enable all instruction set extensions. This is the default.
<br><dt><code>-mno-extensions</code><dd>Disable all instruction set extensions.
<br><dt><code>-m</code><var>extension</var><code> | -mno-</code><var>extension</var><dd>Enable (or disable) a particular instruction set extension.
<br><dt><code>-m</code><var>cpu</var><dd>Enable the instruction set extensions supported by a particular CPU, and
disable all other extensions.
<br><dt><code>-m</code><var>machine</var><dd>Enable the instruction set extensions supported by a particular machine
model, and disable all other extensions.
</dl>
<p>The following options are available when as is configured for
a picoJava processor.
<a name="index-PJ-endianness-11"></a>
<a name="index-endianness_002c-PJ-12"></a>
<a name="index-big-endian-output_002c-PJ-13"></a>
<dl><dt><code>-mb</code><dd>Generate &ldquo;big endian&rdquo; format output.
<p><a name="index-little-endian-output_002c-PJ-14"></a><br><dt><code>-ml</code><dd>Generate &ldquo;little endian&rdquo; format output.
</dl>
<p>The following options are available when as is configured for the
Motorola 68HC11 or 68HC12 series.
<dl>
<dt><code>-m68hc11 | -m68hc12 | -m68hcs12</code><dd>Specify what processor is the target. The default is
defined by the configuration option when building the assembler.
<br><dt><code>-mshort</code><dd>Specify to use the 16-bit integer ABI.
<br><dt><code>-mlong</code><dd>Specify to use the 32-bit integer ABI.
<br><dt><code>-mshort-double</code><dd>Specify to use the 32-bit double ABI.
<br><dt><code>-mlong-double</code><dd>Specify to use the 64-bit double ABI.
<br><dt><code>--force-long-branches</code><dd>Relative branches are turned into absolute ones. This concerns
conditional branches, unconditional branches and branches to a
sub routine.
<br><dt><code>-S | --short-branches</code><dd>Do not turn relative branches into absolute ones
when the offset is out of range.
<br><dt><code>--strict-direct-mode</code><dd>Do not turn the direct addressing mode into extended addressing mode
when the instruction does not support direct addressing mode.
<br><dt><code>--print-insn-syntax</code><dd>Print the syntax of instruction in case of error.
<br><dt><code>--print-opcodes</code><dd>print the list of instructions with syntax and then exit.
<br><dt><code>--generate-example</code><dd>print an example of instruction for each possible instruction and then exit.
This option is only useful for testing <samp><span class="command">as</span></samp>.
</dl>
<p>The following options are available when <samp><span class="command">as</span></samp> is configured
for the SPARC architecture:
<dl>
<dt><code>-Av6 | -Av7 | -Av8 | -Asparclet | -Asparclite</code><dt><code>-Av8plus | -Av8plusa | -Av9 | -Av9a</code><dd>Explicitly select a variant of the SPARC architecture.
<p>&lsquo;<samp><span class="samp">-Av8plus</span></samp>&rsquo; and &lsquo;<samp><span class="samp">-Av8plusa</span></samp>&rsquo; select a 32 bit environment.
&lsquo;<samp><span class="samp">-Av9</span></samp>&rsquo; and &lsquo;<samp><span class="samp">-Av9a</span></samp>&rsquo; select a 64 bit environment.
<p>&lsquo;<samp><span class="samp">-Av8plusa</span></samp>&rsquo; and &lsquo;<samp><span class="samp">-Av9a</span></samp>&rsquo; enable the SPARC V9 instruction set with
UltraSPARC extensions.
<br><dt><code>-xarch=v8plus | -xarch=v8plusa</code><dd>For compatibility with the Solaris v9 assembler. These options are
equivalent to -Av8plus and -Av8plusa, respectively.
<br><dt><code>-bump</code><dd>Warn when the assembler switches to another architecture.
</dl>
<p>The following options are available when as is configured for the 'c54x
architecture.
<dl>
<dt><code>-mfar-mode</code><dd>Enable extended addressing mode. All addresses and relocations will assume
extended addressing (usually 23 bits).
<br><dt><code>-mcpu=</code><var>CPU_VERSION</var><dd>Sets the CPU version being compiled for.
<br><dt><code>-merrors-to-file </code><var>FILENAME</var><dd>Redirect error output to a file, for broken systems which don't support such
behaviour in the shell.
</dl>
<p>The following options are available when as is configured for
a <span class="sc">mips</span> processor.
<dl>
<dt><code>-G </code><var>num</var><dd>This option sets the largest size of an object that can be referenced
implicitly with the <code>gp</code> register. It is only accepted for targets that
use ECOFF format, such as a DECstation running Ultrix. The default value is 8.
<p><a name="index-MIPS-endianness-15"></a><a name="index-endianness_002c-MIPS-16"></a><a name="index-big-endian-output_002c-MIPS-17"></a><br><dt><code>-EB</code><dd>Generate &ldquo;big endian&rdquo; format output.
<p><a name="index-little-endian-output_002c-MIPS-18"></a><br><dt><code>-EL</code><dd>Generate &ldquo;little endian&rdquo; format output.
<p><a name="index-MIPS-ISA-19"></a><br><dt><code>-mips1</code><dt><code>-mips2</code><dt><code>-mips3</code><dt><code>-mips4</code><dt><code>-mips5</code><dt><code>-mips32</code><dt><code>-mips32r2</code><dt><code>-mips64</code><dt><code>-mips64r2</code><dd>Generate code for a particular <span class="sc">mips</span> Instruction Set Architecture level.
&lsquo;<samp><span class="samp">-mips1</span></samp>&rsquo; is an alias for &lsquo;<samp><span class="samp">-march=r3000</span></samp>&rsquo;, &lsquo;<samp><span class="samp">-mips2</span></samp>&rsquo; is an
alias for &lsquo;<samp><span class="samp">-march=r6000</span></samp>&rsquo;, &lsquo;<samp><span class="samp">-mips3</span></samp>&rsquo; is an alias for
&lsquo;<samp><span class="samp">-march=r4000</span></samp>&rsquo; and &lsquo;<samp><span class="samp">-mips4</span></samp>&rsquo; is an alias for &lsquo;<samp><span class="samp">-march=r8000</span></samp>&rsquo;.
&lsquo;<samp><span class="samp">-mips5</span></samp>&rsquo;, &lsquo;<samp><span class="samp">-mips32</span></samp>&rsquo;, &lsquo;<samp><span class="samp">-mips32r2</span></samp>&rsquo;, &lsquo;<samp><span class="samp">-mips64</span></samp>&rsquo;, and
&lsquo;<samp><span class="samp">-mips64r2</span></samp>&rsquo;
correspond to generic
&lsquo;<samp><span class="samp">MIPS V</span></samp>&rsquo;, &lsquo;<samp><span class="samp">MIPS32</span></samp>&rsquo;, &lsquo;<samp><span class="samp">MIPS32 Release 2</span></samp>&rsquo;, &lsquo;<samp><span class="samp">MIPS64</span></samp>&rsquo;,
and &lsquo;<samp><span class="samp">MIPS64 Release 2</span></samp>&rsquo;
ISA processors, respectively.
<br><dt><code>-march=</code><var>CPU</var><dd>Generate code for a particular <span class="sc">mips</span> cpu.
<br><dt><code>-mtune=</code><var>cpu</var><dd>Schedule and tune for a particular <span class="sc">mips</span> cpu.
<br><dt><code>-mfix7000</code><dt><code>-mno-fix7000</code><dd>Cause nops to be inserted if the read of the destination register
of an mfhi or mflo instruction occurs in the following two instructions.
<br><dt><code>-mdebug</code><dt><code>-no-mdebug</code><dd>Cause stabs-style debugging output to go into an ECOFF-style .mdebug
section instead of the standard ELF .stabs sections.
<br><dt><code>-mpdr</code><dt><code>-mno-pdr</code><dd>Control generation of <code>.pdr</code> sections.
<br><dt><code>-mgp32</code><dt><code>-mfp32</code><dd>The register sizes are normally inferred from the ISA and ABI, but these
flags force a certain group of registers to be treated as 32 bits wide at
all times. &lsquo;<samp><span class="samp">-mgp32</span></samp>&rsquo; controls the size of general-purpose registers
and &lsquo;<samp><span class="samp">-mfp32</span></samp>&rsquo; controls the size of floating-point registers.
<br><dt><code>-mips16</code><dt><code>-no-mips16</code><dd>Generate code for the MIPS 16 processor. This is equivalent to putting
<code>.set mips16</code> at the start of the assembly file. &lsquo;<samp><span class="samp">-no-mips16</span></samp>&rsquo;
turns off this option.
<br><dt><code>-mmicromips</code><dt><code>-mno-micromips</code><dd>Generate code for the microMIPS processor. This is equivalent to putting
<code>.set micromips</code> at the start of the assembly file. &lsquo;<samp><span class="samp">-mno-micromips</span></samp>&rsquo;
turns off this option. This is equivalent to putting <code>.set nomicromips</code>
at the start of the assembly file.
<br><dt><code>-msmartmips</code><dt><code>-mno-smartmips</code><dd>Enables the SmartMIPS extension to the MIPS32 instruction set. This is
equivalent to putting <code>.set smartmips</code> at the start of the assembly file.
&lsquo;<samp><span class="samp">-mno-smartmips</span></samp>&rsquo; turns off this option.
<br><dt><code>-mips3d</code><dt><code>-no-mips3d</code><dd>Generate code for the MIPS-3D Application Specific Extension.
This tells the assembler to accept MIPS-3D instructions.
&lsquo;<samp><span class="samp">-no-mips3d</span></samp>&rsquo; turns off this option.
<br><dt><code>-mdmx</code><dt><code>-no-mdmx</code><dd>Generate code for the MDMX Application Specific Extension.
This tells the assembler to accept MDMX instructions.
&lsquo;<samp><span class="samp">-no-mdmx</span></samp>&rsquo; turns off this option.
<br><dt><code>-mdsp</code><dt><code>-mno-dsp</code><dd>Generate code for the DSP Release 1 Application Specific Extension.
This tells the assembler to accept DSP Release 1 instructions.
&lsquo;<samp><span class="samp">-mno-dsp</span></samp>&rsquo; turns off this option.
<br><dt><code>-mdspr2</code><dt><code>-mno-dspr2</code><dd>Generate code for the DSP Release 2 Application Specific Extension.
This option implies -mdsp.
This tells the assembler to accept DSP Release 2 instructions.
&lsquo;<samp><span class="samp">-mno-dspr2</span></samp>&rsquo; turns off this option.
<br><dt><code>-mmt</code><dt><code>-mno-mt</code><dd>Generate code for the MT Application Specific Extension.
This tells the assembler to accept MT instructions.
&lsquo;<samp><span class="samp">-mno-mt</span></samp>&rsquo; turns off this option.
<br><dt><code>-mmcu</code><dt><code>-mno-mcu</code><dd>Generate code for the MCU Application Specific Extension.
This tells the assembler to accept MCU instructions.
&lsquo;<samp><span class="samp">-mno-mcu</span></samp>&rsquo; turns off this option.
<br><dt><code>--construct-floats</code><dt><code>--no-construct-floats</code><dd>The &lsquo;<samp><span class="samp">--no-construct-floats</span></samp>&rsquo; option disables the construction of
double width floating point constants by loading the two halves of the
value into the two single width floating point registers that make up
the double width register. By default &lsquo;<samp><span class="samp">--construct-floats</span></samp>&rsquo; is
selected, allowing construction of these floating point constants.
<p><a name="index-emulation-20"></a><br><dt><code>--emulation=</code><var>name</var><dd>This option causes <samp><span class="command">as</span></samp> to emulate <samp><span class="command">as</span></samp> configured
for some other target, in all respects, including output format (choosing
between ELF and ECOFF only), handling of pseudo-opcodes which may generate
debugging information or store symbol table information, and default
endianness. The available configuration names are: &lsquo;<samp><span class="samp">mipsecoff</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">mipself</span></samp>&rsquo;, &lsquo;<samp><span class="samp">mipslecoff</span></samp>&rsquo;, &lsquo;<samp><span class="samp">mipsbecoff</span></samp>&rsquo;, &lsquo;<samp><span class="samp">mipslelf</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">mipsbelf</span></samp>&rsquo;. The first two do not alter the default endianness from that
of the primary target for which the assembler was configured; the others change
the default to little- or big-endian as indicated by the &lsquo;<samp><span class="samp">b</span></samp>&rsquo; or &lsquo;<samp><span class="samp">l</span></samp>&rsquo;
in the name. Using &lsquo;<samp><span class="samp">-EB</span></samp>&rsquo; or &lsquo;<samp><span class="samp">-EL</span></samp>&rsquo; will override the endianness
selection in any case.
<p>This option is currently supported only when the primary target
<samp><span class="command">as</span></samp> is configured for is a <span class="sc">mips</span> ELF or ECOFF target.
Furthermore, the primary target or others specified with
&lsquo;<samp><span class="samp">--enable-targets=...</span></samp>&rsquo; at configuration time must include support for
the other format, if both are to be available. For example, the Irix 5
configuration includes support for both.
<p>Eventually, this option will support more configurations, with more
fine-grained control over the assembler's behavior, and will be supported for
more processors.
<br><dt><code>-nocpp</code><dd><samp><span class="command">as</span></samp> ignores this option. It is accepted for compatibility with
the native tools.
<br><dt><code>--trap</code><dt><code>--no-trap</code><dt><code>--break</code><dt><code>--no-break</code><dd>Control how to deal with multiplication overflow and division by zero.
&lsquo;<samp><span class="samp">--trap</span></samp>&rsquo; or &lsquo;<samp><span class="samp">--no-break</span></samp>&rsquo; (which are synonyms) take a trap exception
(and only work for Instruction Set Architecture level 2 and higher);
&lsquo;<samp><span class="samp">--break</span></samp>&rsquo; or &lsquo;<samp><span class="samp">--no-trap</span></samp>&rsquo; (also synonyms, and the default) take a
break exception.
<br><dt><code>-n</code><dd>When this option is used, <samp><span class="command">as</span></samp> will issue a warning every
time it generates a nop instruction from a macro.
</dl>
<p>The following options are available when as is configured for
an MCore processor.
<dl>
<dt><code>-jsri2bsr</code><dt><code>-nojsri2bsr</code><dd>Enable or disable the JSRI to BSR transformation. By default this is enabled.
The command line option &lsquo;<samp><span class="samp">-nojsri2bsr</span></samp>&rsquo; can be used to disable it.
<br><dt><code>-sifilter</code><dt><code>-nosifilter</code><dd>Enable or disable the silicon filter behaviour. By default this is disabled.
The default can be overridden by the &lsquo;<samp><span class="samp">-sifilter</span></samp>&rsquo; command line option.
<br><dt><code>-relax</code><dd>Alter jump instructions for long displacements.
<br><dt><code>-mcpu=[210|340]</code><dd>Select the cpu type on the target hardware. This controls which instructions
can be assembled.
<br><dt><code>-EB</code><dd>Assemble for a big endian target.
<br><dt><code>-EL</code><dd>Assemble for a little endian target.
</dl>
<p>See the info pages for documentation of the MMIX-specific options.
<p>See the info pages for documentation of the RX-specific options.
<p>The following options are available when as is configured for the s390
processor family.
<dl>
<dt><code>-m31</code><dt><code>-m64</code><dd>Select the word size, either 31/32 bits or 64 bits.
<br><dt><code>-mesa</code><br><dt><code>-mzarch</code><dd>Select the architecture mode, either the Enterprise System
Architecture (esa) or the z/Architecture mode (zarch).
<br><dt><code>-march=</code><var>processor</var><dd>Specify which s390 processor variant is the target, &lsquo;<samp><span class="samp">g6</span></samp>&rsquo;, &lsquo;<samp><span class="samp">g6</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">z900</span></samp>&rsquo;, &lsquo;<samp><span class="samp">z990</span></samp>&rsquo;, &lsquo;<samp><span class="samp">z9-109</span></samp>&rsquo;, &lsquo;<samp><span class="samp">z9-ec</span></samp>&rsquo;, or &lsquo;<samp><span class="samp">z10</span></samp>&rsquo;.
<br><dt><code>-mregnames</code><dt><code>-mno-regnames</code><dd>Allow or disallow symbolic names for registers.
<br><dt><code>-mwarn-areg-zero</code><dd>Warn whenever the operand for a base or index register has been specified
but evaluates to zero.
</dl>
<p>The following options are available when as is configured for a
TMS320C6000 processor.
<dl>
<dt><code>-march=</code><var>arch</var><dd>Enable (only) instructions from architecture <var>arch</var>. By default,
all instructions are permitted.
<p>The following values of <var>arch</var> are accepted: <code>c62x</code>,
<code>c64x</code>, <code>c64x+</code>, <code>c67x</code>, <code>c67x+</code>, <code>c674x</code>.
<br><dt><code>-matomic</code><dt><code>-mno-atomic</code><dd>Enable or disable the optional C64x+ atomic operation instructions.
By default, they are enabled if no <samp><span class="option">-march</span></samp> option is given, or
if an architecture is specified with <samp><span class="option">-march</span></samp> that implies
these instructions are present (currently, there are no such
architectures); they are disabled if an architecture is specified with
<samp><span class="option">-march</span></samp> on which the instructions are optional or not
present. This option overrides such a default from the architecture,
independent of the order in which the <samp><span class="option">-march</span></samp> or
<samp><span class="option">-matomic</span></samp> or <samp><span class="option">-mno-atomic</span></samp> options are passed.
<br><dt><code>-mdsbt</code><dt><code>-mno-dsbt</code><dd>The <samp><span class="option">-mdsbt</span></samp> option causes the assembler to generate the
<code>Tag_ABI_DSBT</code> attribute with a value of 1, indicating that the
code is using DSBT addressing. The <samp><span class="option">-mno-dsbt</span></samp> option, the
default, causes the tag to have a value of 0, indicating that the code
does not use DSBT addressing. The linker will emit a warning if
objects of different type (DSBT and non-DSBT) are linked together.
<br><dt><code>-mpid=no</code><dt><code>-mpid=near</code><dt><code>-mpid=far</code><dd>The <samp><span class="option">-mpid=</span></samp> option causes the assembler to generate the
<code>Tag_ABI_PID</code> attribute with a value indicating the form of data
addressing used by the code. <samp><span class="option">-mpid=no</span></samp>, the default,
indicates position-dependent data addressing, <samp><span class="option">-mpid=near</span></samp>
indicates position-independent addressing with GOT accesses using near
DP addressing, and <samp><span class="option">-mpid=far</span></samp> indicates position-independent
addressing with GOT accesses using far DP addressing. The linker will
emit a warning if objects built with different settings of this option
are linked together.
<br><dt><code>-mpic</code><dt><code>-mno-pic</code><dd>The <samp><span class="option">-mpic</span></samp> option causes the assembler to generate the
<code>Tag_ABI_PIC</code> attribute with a value of 1, indicating that the
code is using position-independent code addressing, The
<code>-mno-pic</code> option, the default, causes the tag to have a value of
0, indicating position-dependent code addressing. The linker will
emit a warning if objects of different type (position-dependent and
position-independent) are linked together.
<br><dt><code>-mbig-endian</code><dt><code>-mlittle-endian</code><dd>Generate code for the specified endianness. The default is
little-endian.
</dl>
<p>The following options are available when as is configured for
an Xtensa processor.
<dl>
<dt><code>--text-section-literals | --no-text-section-literals</code><dd>With <samp><span class="option">--text-section-literals</span></samp>, literal pools are interspersed
in the text section. The default is
<samp><span class="option">--no-text-section-literals</span></samp>, which places literals in a
separate section in the output file. These options only affect literals
referenced via PC-relative <code>L32R</code> instructions; literals for
absolute mode <code>L32R</code> instructions are handled separately.
<br><dt><code>--absolute-literals | --no-absolute-literals</code><dd>Indicate to the assembler whether <code>L32R</code> instructions use absolute
or PC-relative addressing. The default is to assume absolute addressing
if the Xtensa processor includes the absolute <code>L32R</code> addressing
option. Otherwise, only the PC-relative <code>L32R</code> mode can be used.
<br><dt><code>--target-align | --no-target-align</code><dd>Enable or disable automatic alignment to reduce branch penalties at the
expense of some code density. The default is <samp><span class="option">--target-align</span></samp>.
<br><dt><code>--longcalls | --no-longcalls</code><dd>Enable or disable transformation of call instructions to allow calls
across a greater range of addresses. The default is
<samp><span class="option">--no-longcalls</span></samp>.
<br><dt><code>--transform | --no-transform</code><dd>Enable or disable all assembler transformations of Xtensa instructions.
The default is <samp><span class="option">--transform</span></samp>;
<samp><span class="option">--no-transform</span></samp> should be used only in the rare cases when the
instructions must be exactly as specified in the assembly source.
<br><dt><code>--rename-section </code><var>oldname</var><code>=</code><var>newname</var><dd>When generating output sections, rename the <var>oldname</var> section to
<var>newname</var>.
</dl>
<p>The following options are available when as is configured for
a Z80 family processor.
<dl>
<dt><code>-z80</code><dd>Assemble for Z80 processor.
<br><dt><code>-r800</code><dd>Assemble for R800 processor.
<br><dt><code>-ignore-undocumented-instructions</code><dt><code>-Wnud</code><dd>Assemble undocumented Z80 instructions that also work on R800 without warning.
<br><dt><code>-ignore-unportable-instructions</code><dt><code>-Wnup</code><dd>Assemble all undocumented Z80 instructions without warning.
<br><dt><code>-warn-undocumented-instructions</code><dt><code>-Wud</code><dd>Issue a warning for undocumented Z80 instructions that also work on R800.
<br><dt><code>-warn-unportable-instructions</code><dt><code>-Wup</code><dd>Issue a warning for undocumented Z80 instructions that do not work on R800.
<br><dt><code>-forbid-undocumented-instructions</code><dt><code>-Fud</code><dd>Treat all undocumented instructions as errors.
<br><dt><code>-forbid-unportable-instructions</code><dt><code>-Fup</code><dd>Treat undocumented Z80 instructions that do not work on R800 as errors.
</dl>
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