1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<!-- Copyright (C) 1988-2021 Free Software Foundation, Inc. 4 5Permission is granted to copy, distribute and/or modify this document 6under the terms of the GNU Free Documentation License, Version 1.3 or 7any later version published by the Free Software Foundation; with the 8Invariant Sections being "Free Software" and "Free Software Needs 9Free Documentation", with the Front-Cover Texts being "A GNU Manual," 10and with the Back-Cover Texts as in (a) below. 11 12(a) The FSF's Back-Cover Text is: "You are free to copy and modify 13this GNU Manual. Buying copies from GNU Press supports the FSF in 14developing GNU and promoting software freedom." --> 15<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> 16<head> 17<title>Debugging with GDB: Separate Objdir</title> 18 19<meta name="description" content="Debugging with GDB: Separate Objdir"> 20<meta name="keywords" content="Debugging with GDB: Separate Objdir"> 21<meta name="resource-type" content="document"> 22<meta name="distribution" content="global"> 23<meta name="Generator" content="makeinfo"> 24<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 25<link href="index.html#Top" rel="start" title="Top"> 26<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> 27<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> 28<link href="Installing-GDB.html#Installing-GDB" rel="up" title="Installing GDB"> 29<link href="Config-Names.html#Config-Names" rel="next" title="Config Names"> 30<link href="Running-Configure.html#Running-Configure" rel="previous" title="Running Configure"> 31<style type="text/css"> 32<!-- 33a.summary-letter {text-decoration: none} 34blockquote.smallquotation {font-size: smaller} 35div.display {margin-left: 3.2em} 36div.example {margin-left: 3.2em} 37div.indentedblock {margin-left: 3.2em} 38div.lisp {margin-left: 3.2em} 39div.smalldisplay {margin-left: 3.2em} 40div.smallexample {margin-left: 3.2em} 41div.smallindentedblock {margin-left: 3.2em; font-size: smaller} 42div.smalllisp {margin-left: 3.2em} 43kbd {font-style:oblique} 44pre.display {font-family: inherit} 45pre.format {font-family: inherit} 46pre.menu-comment {font-family: serif} 47pre.menu-preformatted {font-family: serif} 48pre.smalldisplay {font-family: inherit; font-size: smaller} 49pre.smallexample {font-size: smaller} 50pre.smallformat {font-family: inherit; font-size: smaller} 51pre.smalllisp {font-size: smaller} 52span.nocodebreak {white-space:nowrap} 53span.nolinebreak {white-space:nowrap} 54span.roman {font-family:serif; font-weight:normal} 55span.sansserif {font-family:sans-serif; font-weight:normal} 56ul.no-bullet {list-style: none} 57--> 58</style> 59 60 61</head> 62 63<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> 64<a name="Separate-Objdir"></a> 65<div class="header"> 66<p> 67Next: <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="previous">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> 68</div> 69<hr> 70<a name="Compiling-GDB-in-Another-Directory"></a> 71<h3 class="section">C.3 Compiling <small>GDB</small> in Another Directory</h3> 72 73<p>If you want to run <small>GDB</small> versions for several host or target machines, 74you need a different <code>gdb</code> compiled for each combination of 75host and target. <samp>configure</samp> is designed to make this easy by 76allowing you to generate each configuration in a separate subdirectory, 77rather than in the source directory. If your <code>make</code> program 78handles the ‘<samp>VPATH</samp>’ feature (<small>GNU</small> <code>make</code> does), running 79<code>make</code> in each of these directories builds the <code>gdb</code> 80program specified there. 81</p> 82<p>To build <code>gdb</code> in a separate directory, run <samp>configure</samp> 83with the ‘<samp>--srcdir</samp>’ option to specify where to find the source. 84(You also need to specify a path to find <samp>configure</samp> 85itself from your working directory. If the path to <samp>configure</samp> 86would be the same as the argument to ‘<samp>--srcdir</samp>’, you can leave out 87the ‘<samp>--srcdir</samp>’ option; it is assumed.) 88</p> 89<p>For example, with version 10.2.90.20210621-git, you can build <small>GDB</small> in a 90separate directory for a Sun 4 like this: 91</p> 92<div class="smallexample"> 93<pre class="smallexample">cd gdb-10.2.90.20210621-git 94mkdir ../gdb-sun4 95cd ../gdb-sun4 96../gdb-10.2.90.20210621-git/configure 97make 98</pre></div> 99 100<p>When <samp>configure</samp> builds a configuration using a remote source 101directory, it creates a tree for the binaries with the same structure 102(and using the same names) as the tree under the source directory. In 103the example, you’d find the Sun 4 library <samp>libiberty.a</samp> in the 104directory <samp>gdb-sun4/libiberty</samp>, and <small>GDB</small> itself in 105<samp>gdb-sun4/gdb</samp>. 106</p> 107<p>Make sure that your path to the <samp>configure</samp> script has just one 108instance of <samp>gdb</samp> in it. If your path to <samp>configure</samp> looks 109like <samp>../gdb-10.2.90.20210621-git/gdb/configure</samp>, you are configuring only 110one subdirectory of <small>GDB</small>, not the whole package. This leads to 111build errors about missing include files such as <samp>bfd/bfd.h</samp>. 112</p> 113<p>One popular reason to build several <small>GDB</small> configurations in separate 114directories is to configure <small>GDB</small> for cross-compiling (where 115<small>GDB</small> runs on one machine—the <em>host</em>—while debugging 116programs that run on another machine—the <em>target</em>). 117You specify a cross-debugging target by 118giving the ‘<samp>--target=<var>target</var></samp>’ option to <samp>configure</samp>. 119</p> 120<p>When you run <code>make</code> to build a program or library, you must run 121it in a configured directory—whatever directory you were in when you 122called <samp>configure</samp> (or one of its subdirectories). 123</p> 124<p>The <code>Makefile</code> that <samp>configure</samp> generates in each source 125directory also runs recursively. If you type <code>make</code> in a source 126directory such as <samp>gdb-10.2.90.20210621-git</samp> (or in a separate configured 127directory configured with ‘<samp>--srcdir=<var>dirname</var>/gdb-10.2.90.20210621-git</samp>’), you 128will build all the required libraries, and then build GDB. 129</p> 130<p>When you have multiple hosts or targets configured in separate 131directories, you can run <code>make</code> on them in parallel (for example, 132if they are NFS-mounted on each of the hosts); they will not interfere 133with each other. 134</p> 135<hr> 136<div class="header"> 137<p> 138Next: <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="previous">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> 139</div> 140 141 142 143</body> 144</html> 145