<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Copyright (C) 1988-2019 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with the Invariant Sections being "Free Software" and "Free Software Needs Free Documentation", with the Front-Cover Texts being "A GNU Manual," and with the Back-Cover Texts as in (a) below. (a) The FSF's Back-Cover Text is: "You are free to copy and modify this GNU Manual. Buying copies from GNU Press supports the FSF in developing GNU and promoting software freedom." --> <!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ --> <head> <title>Separate Objdir (Debugging with GDB)</title> <meta name="description" content="Separate Objdir (Debugging with GDB)"> <meta name="keywords" content="Separate Objdir (Debugging with GDB)"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <link href="index.html#Top" rel="start" title="Top"> <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> <link href="Installing-GDB.html#Installing-GDB" rel="up" title="Installing GDB"> <link href="Config-Names.html#Config-Names" rel="next" title="Config Names"> <link href="Running-Configure.html#Running-Configure" rel="prev" title="Running Configure"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} blockquote.smallquotation {font-size: smaller} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} div.lisp {margin-left: 3.2em} div.smalldisplay {margin-left: 3.2em} div.smallexample {margin-left: 3.2em} div.smalllisp {margin-left: 3.2em} kbd {font-style: oblique} pre.display {font-family: inherit} pre.format {font-family: inherit} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} pre.smalldisplay {font-family: inherit; font-size: smaller} pre.smallexample {font-size: smaller} pre.smallformat {font-family: inherit; font-size: smaller} pre.smalllisp {font-size: smaller} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} ul.no-bullet {list-style: none} --> </style> </head> <body lang="en"> <a name="Separate-Objdir"></a> <div class="header"> <p> Next: <a href="Config-Names.html#Config-Names" accesskey="n" rel="next">Config Names</a>, Previous: <a href="Running-Configure.html#Running-Configure" accesskey="p" rel="prev">Running Configure</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> </div> <hr> <a name="Compiling-GDB-in-Another-Directory"></a> <h3 class="section">C.3 Compiling <small>GDB</small> in Another Directory</h3> <p>If you want to run <small>GDB</small> versions for several host or target machines, you need a different <code>gdb</code> compiled for each combination of host and target. <samp>configure</samp> is designed to make this easy by allowing you to generate each configuration in a separate subdirectory, rather than in the source directory. If your <code>make</code> program handles the ‘<samp>VPATH</samp>’ feature (<small>GNU</small> <code>make</code> does), running <code>make</code> in each of these directories builds the <code>gdb</code> program specified there. </p> <p>To build <code>gdb</code> in a separate directory, run <samp>configure</samp> with the ‘<samp>--srcdir</samp>’ option to specify where to find the source. (You also need to specify a path to find <samp>configure</samp> itself from your working directory. If the path to <samp>configure</samp> would be the same as the argument to ‘<samp>--srcdir</samp>’, you can leave out the ‘<samp>--srcdir</samp>’ option; it is assumed.) </p> <p>For example, with version 8.3, you can build <small>GDB</small> in a separate directory for a Sun 4 like this: </p> <div class="smallexample"> <pre class="smallexample">cd gdb-8.3 mkdir ../gdb-sun4 cd ../gdb-sun4 ../gdb-8.3/configure make </pre></div> <p>When <samp>configure</samp> builds a configuration using a remote source directory, it creates a tree for the binaries with the same structure (and using the same names) as the tree under the source directory. In the example, you’d find the Sun 4 library <samp>libiberty.a</samp> in the directory <samp>gdb-sun4/libiberty</samp>, and <small>GDB</small> itself in <samp>gdb-sun4/gdb</samp>. </p> <p>Make sure that your path to the <samp>configure</samp> script has just one instance of <samp>gdb</samp> in it. If your path to <samp>configure</samp> looks like <samp>../gdb-8.3/gdb/configure</samp>, you are configuring only one subdirectory of <small>GDB</small>, not the whole package. This leads to build errors about missing include files such as <samp>bfd/bfd.h</samp>. </p> <p>One popular reason to build several <small>GDB</small> configurations in separate directories is to configure <small>GDB</small> for cross-compiling (where <small>GDB</small> runs on one machine—the <em>host</em>—while debugging programs that run on another machine—the <em>target</em>). You specify a cross-debugging target by giving the ‘<samp>--target=<var>target</var></samp>’ option to <samp>configure</samp>. </p> <p>When you run <code>make</code> to build a program or library, you must run it in a configured directory—whatever directory you were in when you called <samp>configure</samp> (or one of its subdirectories). </p> <p>The <code>Makefile</code> that <samp>configure</samp> generates in each source directory also runs recursively. If you type <code>make</code> in a source directory such as <samp>gdb-8.3</samp> (or in a separate configured directory configured with ‘<samp>--srcdir=<var>dirname</var>/gdb-8.3</samp>’), you will build all the required libraries, and then build GDB. </p> <p>When you have multiple hosts or targets configured in separate directories, you can run <code>make</code> on them in parallel (for example, if they are NFS-mounted on each of the hosts); they will not interfere with each other. </p> <hr> <div class="header"> <p> Next: <a href="Config-Names.html#Config-Names" accesskey="n" rel="next">Config Names</a>, Previous: <a href="Running-Configure.html#Running-Configure" accesskey="p" rel="prev">Running Configure</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> </div> </body> </html>