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<title>Using as: IA-64 Options</title>
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<a name="IA_002d64-Options"></a>
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<div class="header">
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<p>
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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> [<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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<hr>
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<a name="Options-12"></a>
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<h4 class="subsection">9.17.1 Options</h4>
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<a name="index-IA_002d64-options"></a>
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<a name="index-options-for-IA_002d64"></a>
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<dl compact="compact">
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<dd><a name="index-_002dmconstant_002dgp-command_002dline-option_002c-IA_002d64"></a>
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</dd>
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<dt><samp>-mconstant-gp</samp></dt>
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<dd><p>This option instructs the assembler to mark the resulting object file
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as using the “constant GP” model. With this model, it is assumed
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that the entire program uses a single global pointer (GP) value. Note
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that this option does not in any fashion affect the machine code
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emitted by the assembler. All it does is turn on the EF_IA_64_CONS_GP
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flag in the ELF file header.
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</p>
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</dd>
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<dt><samp>-mauto-pic</samp></dt>
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<dd><p>This option instructs the assembler to mark the resulting object file
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as using the “constant GP without function descriptor” data model.
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This model is like the “constant GP” model, except that it
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additionally does away with function descriptors. What this means is
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that the address of a function refers directly to the function’s code
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entry-point. Normally, such an address would refer to a function
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descriptor, which contains both the code entry-point and the GP-value
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needed by the function. Note that this option does not in any fashion
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affect the machine code emitted by the assembler. All it does is
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turn on the EF_IA_64_NOFUNCDESC_CONS_GP flag in the ELF file header.
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</p>
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</dd>
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<dt><samp>-milp32</samp></dt>
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<dt><samp>-milp64</samp></dt>
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<dt><samp>-mlp64</samp></dt>
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<dt><samp>-mp64</samp></dt>
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<dd><p>These options select the data model. The assembler defaults to <code>-mlp64</code>
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(LP64 data model).
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</p>
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</dd>
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<dt><samp>-mle</samp></dt>
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<dt><samp>-mbe</samp></dt>
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<dd><p>These options select the byte order. The <code>-mle</code> option selects little-endian
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byte order (default) and <code>-mbe</code> selects big-endian byte order. Note that
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IA-64 machine code always uses little-endian byte order.
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</p>
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</dd>
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<dt><samp>-mtune=itanium1</samp></dt>
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<dt><samp>-mtune=itanium2</samp></dt>
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<dd><p>Tune for a particular IA-64 CPU, <var>itanium1</var> or <var>itanium2</var>. The
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default is <var>itanium2</var>.
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</p>
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</dd>
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<dt><samp>-munwind-check=warning</samp></dt>
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<dt><samp>-munwind-check=error</samp></dt>
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<dd><p>These options control what the assembler will do when performing
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consistency checks on unwind directives. <code>-munwind-check=warning</code>
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will make the assembler issue a warning when an unwind directive check
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fails. This is the default. <code>-munwind-check=error</code> will make the
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assembler issue an error when an unwind directive check fails.
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</p>
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</dd>
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<dt><samp>-mhint.b=ok</samp></dt>
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<dt><samp>-mhint.b=warning</samp></dt>
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<dt><samp>-mhint.b=error</samp></dt>
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<dd><p>These options control what the assembler will do when the ‘<samp>hint.b</samp>’
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instruction is used. <code>-mhint.b=ok</code> will make the assembler accept
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‘<samp>hint.b</samp>’. <code>-mint.b=warning</code> will make the assembler issue a
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warning when ‘<samp>hint.b</samp>’ is used. <code>-mhint.b=error</code> will make
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the assembler treat ‘<samp>hint.b</samp>’ as an error, which is the default.
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</p>
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</dd>
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<dt><samp>-x</samp></dt>
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<dt><samp>-xexplicit</samp></dt>
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<dd><p>These options turn on dependency violation checking.
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</p>
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</dd>
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<dt><samp>-xauto</samp></dt>
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<dd><p>This option instructs the assembler to automatically insert stop bits where necessary
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to remove dependency violations. This is the default mode.
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</p>
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</dd>
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<dt><samp>-xnone</samp></dt>
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<dd><p>This option turns off dependency violation checking.
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</p>
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</dd>
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<dt><samp>-xdebug</samp></dt>
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<dd><p>This turns on debug output intended to help tracking down bugs in the dependency
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violation checker.
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</p>
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</dd>
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<dt><samp>-xdebugn</samp></dt>
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<dd><p>This is a shortcut for -xnone -xdebug.
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</p>
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</dd>
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<dt><samp>-xdebugx</samp></dt>
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<dd><p>This is a shortcut for -xexplicit -xdebug.
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</p>
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</dd>
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</dl>
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<a name="index-IA_002d64-Syntax"></a>
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<hr>
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<div class="header">
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<p>
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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> [<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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