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<a name="Configure-Options"></a>
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<p>
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<hr>
<a name="configure-Options"></a>
<h3 class="section">C.5 <samp>configure</samp> Options</h3>

<p>Here is a summary of the <samp>configure</samp> options and arguments that
are most often useful for building <small>GDB</small>.  <samp>configure</samp>
also has several other options not listed here.  See <a href="http://www.gnu.org/software/autoconf/manual/html_node/Running-configure-scripts.html#Running-configure-scripts">(autoconf.info)Running
configure scripts</a>, for a full
explanation of <samp>configure</samp>.
</p>
<div class="smallexample">
<pre class="smallexample">configure <span class="roman">[</span>--help<span class="roman">]</span>
          <span class="roman">[</span>--prefix=<var>dir</var><span class="roman">]</span>
          <span class="roman">[</span>--exec-prefix=<var>dir</var><span class="roman">]</span>
          <span class="roman">[</span>--srcdir=<var>dirname</var><span class="roman">]</span>
          <span class="roman">[</span>--target=<var>target</var><span class="roman">]</span>
</pre></div>

<p>You may introduce options with a single &lsquo;<samp>-</samp>&rsquo; rather than
&lsquo;<samp>--</samp>&rsquo; if you prefer; but you may abbreviate option names if you use
&lsquo;<samp>--</samp>&rsquo;.
</p>
<dl compact="compact">
<dt><code>--help</code></dt>
<dd><p>Display a quick summary of how to invoke <samp>configure</samp>.
</p>
</dd>
<dt><code>--prefix=<var>dir</var></code></dt>
<dd><p>Configure the source to install programs and files under directory
<samp><var>dir</var></samp>.
</p>
</dd>
<dt><code>--exec-prefix=<var>dir</var></code></dt>
<dd><p>Configure the source to install programs under directory
<samp><var>dir</var></samp>.
</p>
</dd>
<dt><code>--srcdir=<var>dirname</var></code></dt>
<dd><p>Use this option to make configurations in directories separate from the
<small>GDB</small> source directories.  Among other things, you can use this to
build (or maintain) several configurations simultaneously, in separate
directories.  <samp>configure</samp> writes configuration-specific files in
the current directory, but arranges for them to use the source in the
directory <var>dirname</var>.  <samp>configure</samp> creates directories under
the working directory in parallel to the source directories below
<var>dirname</var>.
</p>
</dd>
<dt><code>--target=<var>target</var></code></dt>
<dd><p>Configure <small>GDB</small> for cross-debugging programs running on the specified
<var>target</var>.  Without this option, <small>GDB</small> is configured to debug
programs that run on the same machine (<var>host</var>) as <small>GDB</small> itself.
</p>
<p>There is no convenient way to generate a list of all available
targets.  Also see the <code>--enable-targets</code> option, below.
</p></dd>
</dl>

<p>There are many other options that are specific to <small>GDB</small>.  This
lists just the most common ones; there are some very specialized
options not described here.
</p>
<dl compact="compact">
<dt><code>--enable-targets=<span class="roman">[</span><var>target</var><span class="roman">]</span>&hellip;</code></dt>
<dt><code>--enable-targets=all</code></dt>
<dd><p>Configure <small>GDB</small> for cross-debugging programs running on the
specified list of targets.  The special value &lsquo;<samp>all</samp>&rsquo; configures
<small>GDB</small> for debugging programs running on any target it supports.
</p>
</dd>
<dt><code>--with-gdb-datadir=<var>path</var></code></dt>
<dd><p>Set the <small>GDB</small>-specific data directory.  <small>GDB</small> will look
here for certain supporting files or scripts.  This defaults to the
<samp>gdb</samp> subdirectory of &lsquo;<samp>datadir</samp>&rsquo; (which can be set using
<code>--datadir</code>).
</p>
</dd>
<dt><code>--with-relocated-sources=<var>dir</var></code></dt>
<dd><p>Sets up the default source path substitution rule so that directory
names recorded in debug information will be automatically adjusted for
any directory under <var>dir</var>.  <var>dir</var> should be a subdirectory of
<small>GDB</small>&rsquo;s configured prefix, the one mentioned in the
<code>--prefix</code> or <code>--exec-prefix</code> options to configure.  This
option is useful if GDB is supposed to be moved to a different place
after it is built.
</p>
</dd>
<dt><code>--enable-64-bit-bfd</code></dt>
<dd><p>Enable 64-bit support in BFD on 32-bit hosts.
</p>
</dd>
<dt><code>--disable-gdbmi</code></dt>
<dd><p>Build <small>GDB</small> without the GDB/MI machine interface
(see <a href="GDB_002fMI.html#GDB_002fMI">GDB/MI</a>).
</p>
</dd>
<dt><code>--enable-tui</code></dt>
<dd><p>Build <small>GDB</small> with the text-mode full-screen user interface
(TUI).  Requires a curses library (ncurses and cursesX are also
supported).
</p>
</dd>
<dt><code>--with-curses</code></dt>
<dd><p>Use the curses library instead of the termcap library, for text-mode
terminal operations.
</p>
</dd>
<dt><code>--with-debuginfod</code></dt>
<dd><p>Build <small>GDB</small> with libdebuginfod, the debuginfod client library.
Used to automatically fetch source files and separate debug files from
debuginfod servers using the associated executable&rsquo;s build ID. Enabled
by default if libdebuginfod is installed and found at configure time.
debuginfod is packaged with elfutils, starting with version 0.178. You
can get the latest version from &lsquo;https://sourceware.org/elfutils/&rsquo;.
</p>
</dd>
<dt><code>--with-libunwind-ia64</code></dt>
<dd><p>Use the libunwind library for unwinding function call stack on ia64
target platforms.  See http://www.nongnu.org/libunwind/index.html for
details.
</p>
</dd>
<dt><code>--with-system-readline</code></dt>
<dd><p>Use the readline library installed on the host, rather than the
library supplied as part of <small>GDB</small>.  Readline 7 or newer is
required; this is enforced by the build system.
</p>
</dd>
<dt><code>--with-system-zlib</code></dt>
<dd><p>Use the zlib library installed on the host, rather than the library
supplied as part of <small>GDB</small>.
</p>
</dd>
<dt><code>--with-expat</code></dt>
<dd><p>Build <small>GDB</small> with Expat, a library for XML parsing.  (Done by
default if libexpat is installed and found at configure time.)  This
library is used to read XML files supplied with <small>GDB</small>.  If it
is unavailable, some features, such as remote protocol memory maps,
target descriptions, and shared library lists, that are based on XML
files, will not be available in <small>GDB</small>.  If your host does not
have libexpat installed, you can get the latest version from
&lsquo;http://expat.sourceforge.net&rsquo;.
</p>
</dd>
<dt><code>--with-libiconv-prefix<span class="roman">[</span>=<var>dir</var><span class="roman">]</span></code></dt>
<dd>
<p>Build <small>GDB</small> with GNU libiconv, a character set encoding
conversion library.  This is not done by default, as on GNU systems
the <code>iconv</code> that is built in to the C library is sufficient.  If
your host does not have a working <code>iconv</code>, you can get the latest
version of GNU iconv from &lsquo;https://www.gnu.org/software/libiconv/&rsquo;.
</p>
<p><small>GDB</small>&rsquo;s build system also supports building GNU libiconv as
part of the overall build.   See <a href="Requirements.html#Requirements">Requirements</a>.
</p>
</dd>
<dt><code>--with-lzma</code></dt>
<dd><p>Build <small>GDB</small> with LZMA, a compression library.  (Done by default
if liblzma is installed and found at configure time.)  LZMA is used by
<small>GDB</small>&rsquo;s &quot;mini debuginfo&quot; feature, which is only useful on
platforms using the ELF object file format.  If your host does not
have liblzma installed, you can get the latest version from
&lsquo;https://tukaani.org/xz/&rsquo;.
</p>
</dd>
<dt><code>--with-mpfr</code></dt>
<dd><p>Build <small>GDB</small> with GNU MPFR, a library for multiple-precision
floating-point computation with correct rounding.  (Done by default if
GNU MPFR is installed and found at configure time.)  This library is
used to emulate target floating-point arithmetic during expression
evaluation when the target uses different floating-point formats than
the host.  If GNU MPFR is not available, <small>GDB</small> will fall back
to using host floating-point arithmetic.  If your host does not have
GNU MPFR installed, you can get the latest version from
&lsquo;http://www.mpfr.org&rsquo;.
</p>
</dd>
<dt><code>--with-python<span class="roman">[</span>=<var>python</var><span class="roman">]</span></code></dt>
<dd><p>Build <small>GDB</small> with Python scripting support.  (Done by default if
libpython is present and found at configure time.)  Python makes
<small>GDB</small> scripting much more powerful than the restricted CLI
scripting language.  If your host does not have Python installed, you
can find it on &lsquo;http://www.python.org/download/&rsquo;.  The oldest version
of Python supported by GDB is 2.6.  The optional argument <var>python</var>
is used to find the Python headers and libraries.  It can be either
the name of a Python executable, or the name of the directory in which
Python is installed.
</p>
</dd>
<dt><code>--with-guile[=GUILE]'</code></dt>
<dd><p>Build <small>GDB</small> with GNU Guile scripting support.  (Done by default
if libguile is present and found at configure time.)  If your host
does not have Guile installed, you can find it at
&lsquo;https://www.gnu.org/software/guile/&rsquo;.  The optional argument GUILE
can be a version number, which will cause <code>configure</code> to try to
use that version of Guile; or the file name of a <code>pkg-config</code>
executable, which will be queried to find the information needed to
compile and link against Guile.
</p>
</dd>
<dt><code>--without-included-regex</code></dt>
<dd><p>Don&rsquo;t use the regex library included with <small>GDB</small> (as part of the
libiberty library).  This is the default on hosts with version 2 of
the GNU C library.
</p>
</dd>
<dt><code>--with-sysroot=<var>dir</var></code></dt>
<dd><p>Use <var>dir</var> as the default system root directory for libraries whose
file names begin with <samp>/lib</samp>&rsquo; or <samp>/usr/lib'</samp>.  (The value of
<var>dir</var> can be modified at run time by using the <code>set
sysroot</code> command.)  If <var>dir</var> is under the <small>GDB</small> configured
prefix (set with <code>--prefix</code> or <code>--exec-prefix options</code>, the
default system root will be automatically adjusted if and when
<small>GDB</small> is moved to a different location.
</p>
</dd>
<dt><code>--with-system-gdbinit=<var>file</var></code></dt>
<dd><p>Configure <small>GDB</small> to automatically load a system-wide init file.
<var>file</var> should be an absolute file name.  If <var>file</var> is in a
directory under the configured prefix, and <small>GDB</small> is moved to
another location after being built, the location of the system-wide
init file will be adjusted accordingly.
</p>
</dd>
<dt><code>--with-system-gdbinit-dir=<var>directory</var></code></dt>
<dd><p>Configure <small>GDB</small> to automatically load init files from a
system-wide directory.  <var>directory</var> should be an absolute directory
name.  If <var>directory</var> is in a directory under the configured
prefix, and <small>GDB</small> is moved to another location after being
built, the location of the system-wide init directory will be
adjusted accordingly.
</p>
</dd>
<dt><code>--enable-build-warnings</code></dt>
<dd><p>When building the <small>GDB</small> sources, ask the compiler to warn about
any code which looks even vaguely suspicious.  It passes many
different warning flags, depending on the exact version of the
compiler you are using.
</p>
</dd>
<dt><code>--enable-werror</code></dt>
<dd><p>Treat compiler warnings as werrors.  It adds the <code>-Werror</code> flag
to the compiler, which will fail the compilation if the compiler
outputs any warning messages.
</p>
</dd>
<dt><code>--enable-ubsan</code></dt>
<dd><p>Enable the GCC undefined behavior sanitizer.  This is disabled by
default, but passing <code>--enable-ubsan=yes</code> or
<code>--enable-ubsan=auto</code> to <code>configure</code> will enable it.  The
undefined behavior sanitizer checks for C<tt>++</tt> undefined behavior.
It has a performance cost, so if you are looking at <small>GDB</small>&rsquo;s
performance, you should disable it.  The undefined behavior sanitizer
was first introduced in GCC 4.9.
</p></dd>
</dl>

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