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| <h4 class="subsection">3.4.2 Commands Dealing with Files</h4> |
| |
| <p><a name="index-linker-script-file-commands-346"></a>Several linker script commands deal with files. |
| |
| <dl> |
| <dt><code>INCLUDE </code><var>filename</var><dd><a name="index-INCLUDE-_0040var_007bfilename_007d-347"></a><a name="index-including-a-linker-script-348"></a>Include the linker script <var>filename</var> at this point. The file will |
| be searched for in the current directory, and in any directory specified |
| with the <samp><span class="option">-L</span></samp> option. You can nest calls to <code>INCLUDE</code> up to |
| 10 levels deep. |
| |
| <p>You can place <code>INCLUDE</code> directives at the top level, in <code>MEMORY</code> or |
| <code>SECTIONS</code> commands, or in output section descriptions. |
| |
| <br><dt><code>INPUT(</code><var>file</var><code>, </code><var>file</var><code>, ...)</code><dt><code>INPUT(</code><var>file</var> <var>file</var><code> ...)</code><dd><a name="index-INPUT_0028_0040var_007bfiles_007d_0029-349"></a><a name="index-input-files-in-linker-scripts-350"></a><a name="index-input-object-files-in-linker-scripts-351"></a><a name="index-linker-script-input-object-files-352"></a>The <code>INPUT</code> command directs the linker to include the named files |
| in the link, as though they were named on the command line. |
| |
| <p>For example, if you always want to include <samp><span class="file">subr.o</span></samp> any time you do |
| a link, but you can't be bothered to put it on every link command line, |
| then you can put ‘<samp><span class="samp">INPUT (subr.o)</span></samp>’ in your linker script. |
| |
| <p>In fact, if you like, you can list all of your input files in the linker |
| script, and then invoke the linker with nothing but a ‘<samp><span class="samp">-T</span></samp>’ option. |
| |
| <p>In case a <dfn>sysroot prefix</dfn> is configured, and the filename starts |
| with the ‘<samp><span class="samp">/</span></samp>’ character, and the script being processed was |
| located inside the <dfn>sysroot prefix</dfn>, the filename will be looked |
| for in the <dfn>sysroot prefix</dfn>. Otherwise, the linker will try to |
| open the file in the current directory. If it is not found, the |
| linker will search through the archive library search path. See the |
| description of ‘<samp><span class="samp">-L</span></samp>’ in <a href="Options.html#Options">Command Line Options</a>. |
| |
| <p>If you use ‘<samp><span class="samp">INPUT (-l</span><var>file</var><span class="samp">)</span></samp>’, <samp><span class="command">ld</span></samp> will transform the |
| name to <code>lib</code><var>file</var><code>.a</code>, as with the command line argument |
| ‘<samp><span class="samp">-l</span></samp>’. |
| |
| <p>When you use the <code>INPUT</code> command in an implicit linker script, the |
| files will be included in the link at the point at which the linker |
| script file is included. This can affect archive searching. |
| |
| <br><dt><code>GROUP(</code><var>file</var><code>, </code><var>file</var><code>, ...)</code><dt><code>GROUP(</code><var>file</var> <var>file</var><code> ...)</code><dd><a name="index-GROUP_0028_0040var_007bfiles_007d_0029-353"></a><a name="index-grouping-input-files-354"></a>The <code>GROUP</code> command is like <code>INPUT</code>, except that the named |
| files should all be archives, and they are searched repeatedly until no |
| new undefined references are created. See the description of ‘<samp><span class="samp">-(</span></samp>’ |
| in <a href="Options.html#Options">Command Line Options</a>. |
| |
| <br><dt><code>AS_NEEDED(</code><var>file</var><code>, </code><var>file</var><code>, ...)</code><dt><code>AS_NEEDED(</code><var>file</var> <var>file</var><code> ...)</code><dd><a name="index-AS_005fNEEDED_0028_0040var_007bfiles_007d_0029-355"></a>This construct can appear only inside of the <code>INPUT</code> or <code>GROUP</code> |
| commands, among other filenames. The files listed will be handled |
| as if they appear directly in the <code>INPUT</code> or <code>GROUP</code> commands, |
| with the exception of ELF shared libraries, that will be added only |
| when they are actually needed. This construct essentially enables |
| <samp><span class="option">--as-needed</span></samp> option for all the files listed inside of it |
| and restores previous <samp><span class="option">--as-needed</span></samp> resp. <samp><span class="option">--no-as-needed</span></samp> |
| setting afterwards. |
| |
| <br><dt><code>OUTPUT(</code><var>filename</var><code>)</code><dd><a name="index-OUTPUT_0028_0040var_007bfilename_007d_0029-356"></a><a name="index-output-file-name-in-linker-script-357"></a>The <code>OUTPUT</code> command names the output file. Using |
| <code>OUTPUT(</code><var>filename</var><code>)</code> in the linker script is exactly like using |
| ‘<samp><span class="samp">-o </span><var>filename</var></samp>’ on the command line (see <a href="Options.html#Options">Command Line Options</a>). If both are used, the command line option takes |
| precedence. |
| |
| <p>You can use the <code>OUTPUT</code> command to define a default name for the |
| output file other than the usual default of <samp><span class="file">a.out</span></samp>. |
| |
| <br><dt><code>SEARCH_DIR(</code><var>path</var><code>)</code><dd><a name="index-SEARCH_005fDIR_0028_0040var_007bpath_007d_0029-358"></a><a name="index-library-search-path-in-linker-script-359"></a><a name="index-archive-search-path-in-linker-script-360"></a><a name="index-search-path-in-linker-script-361"></a>The <code>SEARCH_DIR</code> command adds <var>path</var> to the list of paths where |
| <samp><span class="command">ld</span></samp> looks for archive libraries. Using |
| <code>SEARCH_DIR(</code><var>path</var><code>)</code> is exactly like using ‘<samp><span class="samp">-L </span><var>path</var></samp>’ |
| on the command line (see <a href="Options.html#Options">Command Line Options</a>). If both |
| are used, then the linker will search both paths. Paths specified using |
| the command line option are searched first. |
| |
| <br><dt><code>STARTUP(</code><var>filename</var><code>)</code><dd><a name="index-STARTUP_0028_0040var_007bfilename_007d_0029-362"></a><a name="index-first-input-file-363"></a>The <code>STARTUP</code> command is just like the <code>INPUT</code> command, except |
| that <var>filename</var> will become the first input file to be linked, as |
| though it were specified first on the command line. This may be useful |
| when using a system in which the entry point is always the start of the |
| first file. |
| </dl> |
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