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| <h4 class="subsection">9.17.1 Options</h4> |
| |
| <p><a name="index-IA_002d64-options-1279"></a><a name="index-options-for-IA_002d64-1280"></a> |
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| <a name="index-g_t_0040code_007b_002dmconstant_002dgp_007d-command_002dline-option_002c-IA_002d64-1281"></a> |
| <dl> |
| <dt><samp><span class="option">-mconstant-gp</span></samp><dd>This option instructs the assembler to mark the resulting object file |
| as using the “constant GP” 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. |
| |
| <br><dt><samp><span class="option">-mauto-pic</span></samp><dd>This option instructs the assembler to mark the resulting object file |
| as using the “constant GP without function descriptor” data model. |
| This model is like the “constant GP” 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'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. |
| |
| <br><dt><samp><span class="option">-milp32</span></samp><dt><samp><span class="option">-milp64</span></samp><dt><samp><span class="option">-mlp64</span></samp><dt><samp><span class="option">-mp64</span></samp><dd>These options select the data model. The assembler defaults to <code>-mlp64</code> |
| (LP64 data model). |
| |
| <br><dt><samp><span class="option">-mle</span></samp><dt><samp><span class="option">-mbe</span></samp><dd>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. |
| |
| <br><dt><samp><span class="option">-mtune=itanium1</span></samp><dt><samp><span class="option">-mtune=itanium2</span></samp><dd>Tune for a particular IA-64 CPU, <var>itanium1</var> or <var>itanium2</var>. The |
| default is <var>itanium2</var>. |
| |
| <br><dt><samp><span class="option">-munwind-check=warning</span></samp><dt><samp><span class="option">-munwind-check=error</span></samp><dd>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. |
| |
| <br><dt><samp><span class="option">-mhint.b=ok</span></samp><dt><samp><span class="option">-mhint.b=warning</span></samp><dt><samp><span class="option">-mhint.b=error</span></samp><dd>These options control what the assembler will do when the ‘<samp><span class="samp">hint.b</span></samp>’ |
| instruction is used. <code>-mhint.b=ok</code> will make the assembler accept |
| ‘<samp><span class="samp">hint.b</span></samp>’. <code>-mint.b=warning</code> will make the assembler issue a |
| warning when ‘<samp><span class="samp">hint.b</span></samp>’ is used. <code>-mhint.b=error</code> will make |
| the assembler treat ‘<samp><span class="samp">hint.b</span></samp>’ as an error, which is the default. |
| |
| <br><dt><samp><span class="option">-x</span></samp><dt><samp><span class="option">-xexplicit</span></samp><dd>These options turn on dependency violation checking. |
| |
| <br><dt><samp><span class="option">-xauto</span></samp><dd>This option instructs the assembler to automatically insert stop bits where necessary |
| to remove dependency violations. This is the default mode. |
| |
| <br><dt><samp><span class="option">-xnone</span></samp><dd>This option turns off dependency violation checking. |
| |
| <br><dt><samp><span class="option">-xdebug</span></samp><dd>This turns on debug output intended to help tracking down bugs in the dependency |
| violation checker. |
| |
| <br><dt><samp><span class="option">-xdebugn</span></samp><dd>This is a shortcut for -xnone -xdebug. |
| |
| <br><dt><samp><span class="option">-xdebugx</span></samp><dd>This is a shortcut for -xexplicit -xdebug. |
| |
| </dl> |
| |
| <p><a name="index-IA_002d64-Syntax-1282"></a> |
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