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<title>Debugging with GDB: Running Configure</title>
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<a name="Running-Configure"></a>
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<div class="header">
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<p>
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Next: <a href="Separate-Objdir.html#Separate-Objdir" accesskey="n" rel="next">Separate Objdir</a>, Previous: <a href="Requirements.html#Requirements" accesskey="p" rel="prev">Requirements</a>, Up: <a href="Installing-GDB.html#Installing-GDB" accesskey="u" rel="up">Installing GDB</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Invoking-the-GDB-configure-Script"></a>
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<h3 class="section">C.2 Invoking the <small>GDB</small> <samp>configure</samp> Script</h3>
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<a name="index-configuring-GDB"></a>
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<p><small>GDB</small> comes with a <samp>configure</samp> script that automates the process
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of preparing <small>GDB</small> for installation; you can then use <code>make</code> to
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build the <code>gdb</code> program.
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</p>
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<p>The <small>GDB</small> distribution includes all the source code you need for
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<small>GDB</small> in a single directory, whose name is usually composed by
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appending the version number to ‘<samp>gdb</samp>’.
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</p>
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<p>For example, the <small>GDB</small> version 7.12.1.20170417-git distribution is in the
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<samp>gdb-7.12.1.20170417-git</samp> directory. That directory contains:
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</p>
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<dl compact="compact">
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<dt><code>gdb-7.12.1.20170417-git/configure <span class="roman">(and supporting files)</span></code></dt>
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<dd><p>script for configuring <small>GDB</small> and all its supporting libraries
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</p>
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</dd>
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<dt><code>gdb-7.12.1.20170417-git/gdb</code></dt>
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<dd><p>the source specific to <small>GDB</small> itself
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</p>
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</dd>
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<dt><code>gdb-7.12.1.20170417-git/bfd</code></dt>
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<dd><p>source for the Binary File Descriptor library
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</p>
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</dd>
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<dt><code>gdb-7.12.1.20170417-git/include</code></dt>
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<dd><p><small>GNU</small> include files
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</p>
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</dd>
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<dt><code>gdb-7.12.1.20170417-git/libiberty</code></dt>
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<dd><p>source for the ‘<samp>-liberty</samp>’ free software library
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</p>
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</dd>
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<dt><code>gdb-7.12.1.20170417-git/opcodes</code></dt>
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<dd><p>source for the library of opcode tables and disassemblers
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</p>
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</dd>
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<dt><code>gdb-7.12.1.20170417-git/readline</code></dt>
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<dd><p>source for the <small>GNU</small> command-line interface
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</p>
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</dd>
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<dt><code>gdb-7.12.1.20170417-git/glob</code></dt>
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<dd><p>source for the <small>GNU</small> filename pattern-matching subroutine
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</p>
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</dd>
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<dt><code>gdb-7.12.1.20170417-git/mmalloc</code></dt>
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<dd><p>source for the <small>GNU</small> memory-mapped malloc package
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</p></dd>
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</dl>
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<p>The simplest way to configure and build <small>GDB</small> is to run <samp>configure</samp>
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from the <samp>gdb-<var>version-number</var></samp> source directory, which in
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this example is the <samp>gdb-7.12.1.20170417-git</samp> directory.
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</p>
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<p>First switch to the <samp>gdb-<var>version-number</var></samp> source directory
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if you are not already in it; then run <samp>configure</samp>. Pass the
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identifier for the platform on which <small>GDB</small> will run as an
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argument.
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</p>
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<p>For example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">cd gdb-7.12.1.20170417-git
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./configure <var>host</var>
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make
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</pre></div>
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<p>where <var>host</var> is an identifier such as ‘<samp>sun4</samp>’ or
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‘<samp>decstation</samp>’, that identifies the platform where <small>GDB</small> will run.
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(You can often leave off <var>host</var>; <samp>configure</samp> tries to guess the
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correct value by examining your system.)
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</p>
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<p>Running ‘<samp>configure <var>host</var></samp>’ and then running <code>make</code> builds the
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<samp>bfd</samp>, <samp>readline</samp>, <samp>mmalloc</samp>, and <samp>libiberty</samp>
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libraries, then <code>gdb</code> itself. The configured source files, and the
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binaries, are left in the corresponding source directories.
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</p>
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<p><samp>configure</samp> is a Bourne-shell (<code>/bin/sh</code>) script; if your
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system does not recognize this automatically when you run a different
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shell, you may need to run <code>sh</code> on it explicitly:
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</p>
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<div class="smallexample">
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<pre class="smallexample">sh configure <var>host</var>
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</pre></div>
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<p>If you run <samp>configure</samp> from a directory that contains source
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directories for multiple libraries or programs, such as the
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<samp>gdb-7.12.1.20170417-git</samp> source directory for version 7.12.1.20170417-git,
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<samp>configure</samp>
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creates configuration files for every directory level underneath (unless
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you tell it not to, with the ‘<samp>--norecursion</samp>’ option).
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</p>
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<p>You should run the <samp>configure</samp> script from the top directory in the
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source tree, the <samp>gdb-<var>version-number</var></samp> directory. If you run
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<samp>configure</samp> from one of the subdirectories, you will configure only
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that subdirectory. That is usually not what you want. In particular,
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if you run the first <samp>configure</samp> from the <samp>gdb</samp> subdirectory
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of the <samp>gdb-<var>version-number</var></samp> directory, you will omit the
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configuration of <samp>bfd</samp>, <samp>readline</samp>, and other sibling
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directories of the <samp>gdb</samp> subdirectory. This leads to build errors
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about missing include files such as <samp>bfd/bfd.h</samp>.
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</p>
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<p>You can install <code>gdb</code> anywhere; it has no hardwired paths.
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However, you should make sure that the shell on your path (named by
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the ‘<samp>SHELL</samp>’ environment variable) is publicly readable. Remember
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that <small>GDB</small> uses the shell to start your program—some systems refuse to
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let <small>GDB</small> debug child processes whose programs are not readable.
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</p>
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<div class="header">
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<p>
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Next: <a href="Separate-Objdir.html#Separate-Objdir" accesskey="n" rel="next">Separate Objdir</a>, Previous: <a href="Requirements.html#Requirements" accesskey="p" rel="prev">Requirements</a>, Up: <a href="Installing-GDB.html#Installing-GDB" accesskey="u" rel="up">Installing GDB</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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