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