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<title>Using as: IA-64 Options</title>

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<a name="IA_002d64-Options"></a>
<div class="header">
<p>
Next: <a href="IA_002d64-Syntax.html#IA_002d64-Syntax" accesskey="n" rel="next">IA-64 Syntax</a>, Up: <a href="IA_002d64_002dDependent.html#IA_002d64_002dDependent" accesskey="u" rel="up">IA-64-Dependent</a> &nbsp; [<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>
</div>
<hr>
<a name="Options-11"></a>
<h4 class="subsection">9.18.1 Options</h4>
<a name="index-IA_002d64-options"></a>
<a name="index-options-for-IA_002d64"></a>

<dl compact="compact">
<dd><a name="index-_002dmconstant_002dgp-command-line-option_002c-IA_002d64"></a>

</dd>
<dt><samp>-mconstant-gp</samp></dt>
<dd><p>This option instructs the assembler to mark the resulting object file
as using the &ldquo;constant GP&rdquo; model.  With this model, it is assumed
that the entire program uses a single global pointer (GP) value.  Note
that this option does not in any fashion affect the machine code
emitted by the assembler.  All it does is turn on the EF_IA_64_CONS_GP
flag in the ELF file header.
</p>
</dd>
<dt><samp>-mauto-pic</samp></dt>
<dd><p>This option instructs the assembler to mark the resulting object file
as using the &ldquo;constant GP without function descriptor&rdquo; data model.
This model is like the &ldquo;constant GP&rdquo; model, except that it
additionally does away with function descriptors.  What this means is
that the address of a function refers directly to the function&rsquo;s code
entry-point.  Normally, such an address would refer to a function
descriptor, which contains both the code entry-point and the GP-value
needed by the function.  Note that this option does not in any fashion
affect the machine code emitted by the assembler.  All it does is
turn on the EF_IA_64_NOFUNCDESC_CONS_GP flag in the ELF file header.
</p>
</dd>
<dt><samp>-milp32</samp></dt>
<dt><samp>-milp64</samp></dt>
<dt><samp>-mlp64</samp></dt>
<dt><samp>-mp64</samp></dt>
<dd><p>These options select the data model.  The assembler defaults to <code>-mlp64</code>
(LP64 data model).
</p>
</dd>
<dt><samp>-mle</samp></dt>
<dt><samp>-mbe</samp></dt>
<dd><p>These options select the byte order.  The <code>-mle</code> option selects little-endian
byte order (default) and <code>-mbe</code> selects big-endian byte order.  Note that
IA-64 machine code always uses little-endian byte order.
</p>
</dd>
<dt><samp>-mtune=itanium1</samp></dt>
<dt><samp>-mtune=itanium2</samp></dt>
<dd><p>Tune for a particular IA-64 CPU, <var>itanium1</var> or <var>itanium2</var>. The
default is <var>itanium2</var>.
</p>
</dd>
<dt><samp>-munwind-check=warning</samp></dt>
<dt><samp>-munwind-check=error</samp></dt>
<dd><p>These options control what the assembler will do when performing
consistency checks on unwind directives.  <code>-munwind-check=warning</code>
will make the assembler issue a warning when an unwind directive check
fails.  This is the default.  <code>-munwind-check=error</code> will make the
assembler issue an error when an unwind directive check fails.
</p>
</dd>
<dt><samp>-mhint.b=ok</samp></dt>
<dt><samp>-mhint.b=warning</samp></dt>
<dt><samp>-mhint.b=error</samp></dt>
<dd><p>These options control what the assembler will do when the &lsquo;<samp>hint.b</samp>&rsquo;
instruction is used.  <code>-mhint.b=ok</code> will make the assembler accept
&lsquo;<samp>hint.b</samp>&rsquo;.  <code>-mint.b=warning</code> will make the assembler issue a
warning when &lsquo;<samp>hint.b</samp>&rsquo; is used.  <code>-mhint.b=error</code> will make
the assembler treat &lsquo;<samp>hint.b</samp>&rsquo; as an error, which is the default.
</p>
</dd>
<dt><samp>-x</samp></dt>
<dt><samp>-xexplicit</samp></dt>
<dd><p>These options turn on dependency violation checking.
</p>
</dd>
<dt><samp>-xauto</samp></dt>
<dd><p>This option instructs the assembler to automatically insert stop bits where necessary
to remove dependency violations.  This is the default mode.
</p>
</dd>
<dt><samp>-xnone</samp></dt>
<dd><p>This option turns off dependency violation checking.
</p>
</dd>
<dt><samp>-xdebug</samp></dt>
<dd><p>This turns on debug output intended to help tracking down bugs in the dependency
violation checker.
</p>
</dd>
<dt><samp>-xdebugn</samp></dt>
<dd><p>This is a shortcut for -xnone -xdebug.
</p>
</dd>
<dt><samp>-xdebugx</samp></dt>
<dd><p>This is a shortcut for -xexplicit -xdebug.
</p>
</dd>
</dl>

<a name="index-IA_002d64-Syntax"></a>
<hr>
<div class="header">
<p>
Next: <a href="IA_002d64-Syntax.html#IA_002d64-Syntax" accesskey="n" rel="next">IA-64 Syntax</a>, Up: <a href="IA_002d64_002dDependent.html#IA_002d64_002dDependent" accesskey="u" rel="up">IA-64-Dependent</a> &nbsp; [<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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