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| <h3 class="section">4.2 <samp><span class="command">ld</span></samp> and the Intel 960 Family</h3> |
| |
| <p><a name="index-i960-support-562"></a> |
| You can use the ‘<samp><span class="samp">-A</span><var>architecture</var></samp>’ command line option to |
| specify one of the two-letter names identifying members of the 960 |
| family; the option specifies the desired output target, and warns of any |
| incompatible instructions in the input files. It also modifies the |
| linker's search strategy for archive libraries, to support the use of |
| libraries specific to each particular architecture, by including in the |
| search loop names suffixed with the string identifying the architecture. |
| |
| <p>For example, if your <samp><span class="command">ld</span></samp> command line included ‘<samp><span class="samp">-ACA</span></samp>’<!-- /@w --> as |
| well as ‘<samp><span class="samp">-ltry</span></samp>’<!-- /@w -->, the linker would look (in its built-in search |
| paths, and in any paths you specify with ‘<samp><span class="samp">-L</span></samp>’) for a library with |
| the names |
| |
| <pre class="smallexample"> try |
| libtry.a |
| tryca |
| libtryca.a |
| </pre> |
| <p class="noindent">The first two possibilities would be considered in any event; the last |
| two are due to the use of ‘<samp><span class="samp">-ACA</span></samp>’<!-- /@w -->. |
| |
| <p>You can meaningfully use ‘<samp><span class="samp">-A</span></samp>’ more than once on a command line, since |
| the 960 architecture family allows combination of target architectures; each |
| use will add another pair of name variants to search for when ‘<samp><span class="samp">-l</span></samp>’<!-- /@w --> |
| specifies a library. |
| |
| <p><a name="index-g_t_0040option_007b_002d_002drelax_007d-on-i960-563"></a><a name="index-relaxing-on-i960-564"></a><samp><span class="command">ld</span></samp> supports the ‘<samp><span class="samp">--relax</span></samp>’ option for the i960 family. If |
| you specify ‘<samp><span class="samp">--relax</span></samp>’, <samp><span class="command">ld</span></samp> finds all <code>balx</code> and |
| <code>calx</code> instructions whose targets are within 24 bits, and turns |
| them into 24-bit program-counter relative <code>bal</code> and <code>cal</code> |
| instructions, respectively. <samp><span class="command">ld</span></samp> also turns <code>cal</code> |
| instructions into <code>bal</code> instructions when it determines that the |
| target subroutine is a leaf routine (that is, the target subroutine does |
| not itself call any subroutines). |
| |
| <p><a name="index-Cortex_002dA8-erratum-workaround-565"></a><a name="index-g_t_002d_002dfix_002dcortex_002da8-566"></a><a name="index-g_t_002d_002dno_002dfix_002dcortex_002da8-567"></a>The ‘<samp><span class="samp">--fix-cortex-a8</span></samp>’ switch enables a link-time workaround for an erratum in certain Cortex-A8 processors. The workaround is enabled by default if you are targeting the ARM v7-A architecture profile. It can be enabled otherwise by specifying ‘<samp><span class="samp">--fix-cortex-a8</span></samp>’, or disabled unconditionally by specifying ‘<samp><span class="samp">--no-fix-cortex-a8</span></samp>’. |
| |
| <p>The erratum only affects Thumb-2 code. Please contact ARM for further details. |
| |
| <p><a name="index-g_t_002d_002dmerge_002dexidx_002dentries-568"></a><a name="index-g_t_002d_002dno_002dmerge_002dexidx_002dentries-569"></a>The ‘<samp><span class="samp">--no-merge-exidx-entries</span></samp>’ switch disables the merging of adjacent exidx entries in debuginfo. |
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