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<h4 class="node-heading">gdb-add-index man</h4>
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<h3 class="heading">gdb-add-index</h3>
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<p>gdb-add-index <var>filename</var>
</p>
<p>When <small>GDB</small> finds a symbol file, it scans the symbols in the
file in order to construct an internal symbol table.  This lets most
<small>GDB</small> operations work quickly&ndash;at the cost of a delay early on.
For large programs, this delay can be quite lengthy, so <small>GDB</small>
provides a way to build an index, which speeds up startup.
</p>
<p>To determine whether a file contains such an index, use the command
<kbd>readelf -S filename</kbd>: the index is stored in a section named
<code>.gdb_index</code>.  The index file can only be produced on systems
which use ELF binaries and DWARF debug information (i.e., sections
named <code>.debug_*</code>).
</p>
<p><code>gdb-add-index</code> uses <small>GDB</small> and <code>objdump</code> found
in the <code>PATH</code> environment variable.  If you want to use different
versions of these programs, you can specify them through the
<code>GDB</code> and <code>OBJDUMP</code> environment variables.
</p>
<p>See more in
<a href="Index-Files.html#Index-Files">Index Files</a>.
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