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| <h4 class="subsection">2.1.1 Choosing Files</h4> |
| |
| <p>When <span class="sc">gdb</span> starts, it reads any arguments other than options as |
| specifying an executable file and core file (or process ID). This is |
| the same as if the arguments were specified by the ‘<samp><span class="samp">-se</span></samp>’ and |
| ‘<samp><span class="samp">-c</span></samp>’ (or ‘<samp><span class="samp">-p</span></samp>’) options respectively. (<span class="sc">gdb</span> reads the |
| first argument that does not have an associated option flag as |
| equivalent to the ‘<samp><span class="samp">-se</span></samp>’ option followed by that argument; and the |
| second argument that does not have an associated option flag, if any, as |
| equivalent to the ‘<samp><span class="samp">-c</span></samp>’/‘<samp><span class="samp">-p</span></samp>’ option followed by that argument.) |
| If the second argument begins with a decimal digit, <span class="sc">gdb</span> will |
| first attempt to attach to it as a process, and if that fails, attempt |
| to open it as a corefile. If you have a corefile whose name begins with |
| a digit, you can prevent <span class="sc">gdb</span> from treating it as a pid by |
| prefixing it with <samp><span class="file">./</span></samp>, e.g. <samp><span class="file">./12345</span></samp>. |
| |
| <p>If <span class="sc">gdb</span> has not been configured to included core file support, |
| such as for most embedded targets, then it will complain about a second |
| argument and ignore it. |
| |
| <p>Many options have both long and short forms; both are shown in the |
| following list. <span class="sc">gdb</span> also recognizes the long forms if you truncate |
| them, so long as enough of the option is present to be unambiguous. |
| (If you prefer, you can flag option arguments with ‘<samp><span class="samp">--</span></samp>’ rather |
| than ‘<samp><span class="samp">-</span></samp>’, though we illustrate the more usual convention.) |
| |
| <!-- NOTE: the @cindex entries here use double dashes ON PURPOSE. This --> |
| <!-- way, both those who look for -foo and -foo in the index, will find --> |
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| <dl> |
| <dt><code>-symbols </code><var>file</var><dt><code>-s </code><var>file</var><dd><a name="index-g_t_0040code_007b_002d_002dsymbols_007d-4"></a><a name="index-g_t_0040code_007b_002ds_007d-5"></a>Read symbol table from file <var>file</var>. |
| |
| <br><dt><code>-exec </code><var>file</var><dt><code>-e </code><var>file</var><dd><a name="index-g_t_0040code_007b_002d_002dexec_007d-6"></a><a name="index-g_t_0040code_007b_002de_007d-7"></a>Use file <var>file</var> as the executable file to execute when appropriate, |
| and for examining pure data in conjunction with a core dump. |
| |
| <br><dt><code>-se </code><var>file</var><dd><a name="index-g_t_0040code_007b_002d_002dse_007d-8"></a>Read symbol table from file <var>file</var> and use it as the executable |
| file. |
| |
| <br><dt><code>-core </code><var>file</var><dt><code>-c </code><var>file</var><dd><a name="index-g_t_0040code_007b_002d_002dcore_007d-9"></a><a name="index-g_t_0040code_007b_002dc_007d-10"></a>Use file <var>file</var> as a core dump to examine. |
| |
| <br><dt><code>-pid </code><var>number</var><dt><code>-p </code><var>number</var><dd><a name="index-g_t_0040code_007b_002d_002dpid_007d-11"></a><a name="index-g_t_0040code_007b_002dp_007d-12"></a>Connect to process ID <var>number</var>, as with the <code>attach</code> command. |
| |
| <br><dt><code>-command </code><var>file</var><dt><code>-x </code><var>file</var><dd><a name="index-g_t_0040code_007b_002d_002dcommand_007d-13"></a><a name="index-g_t_0040code_007b_002dx_007d-14"></a>Execute commands from file <var>file</var>. The contents of this file is |
| evaluated exactly as the <code>source</code> command would. |
| See <a href="Command-Files.html#Command-Files">Command files</a>. |
| |
| <br><dt><code>-eval-command </code><var>command</var><dt><code>-ex </code><var>command</var><dd><a name="index-g_t_0040code_007b_002d_002deval_002dcommand_007d-15"></a><a name="index-g_t_0040code_007b_002dex_007d-16"></a>Execute a single <span class="sc">gdb</span> command. |
| |
| <p>This option may be used multiple times to call multiple commands. It may |
| also be interleaved with ‘<samp><span class="samp">-command</span></samp>’ as required. |
| |
| <pre class="smallexample"> gdb -ex 'target sim' -ex 'load' \ |
| -x setbreakpoints -ex 'run' a.out |
| </pre> |
| <br><dt><code>-directory </code><var>directory</var><dt><code>-d </code><var>directory</var><dd><a name="index-g_t_0040code_007b_002d_002ddirectory_007d-17"></a><a name="index-g_t_0040code_007b_002dd_007d-18"></a>Add <var>directory</var> to the path to search for source and script files. |
| |
| <br><dt><code>-r</code><dt><code>-readnow</code><dd><a name="index-g_t_0040code_007b_002d_002dreadnow_007d-19"></a><a name="index-g_t_0040code_007b_002dr_007d-20"></a>Read each symbol file's entire symbol table immediately, rather than |
| the default, which is to read it incrementally as it is needed. |
| This makes startup slower, but makes future operations faster. |
| |
| </dl> |
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