113 lines
6.3 KiB
HTML
113 lines
6.3 KiB
HTML
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<html lang="en">
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<head>
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<title>Separate Objdir - Debugging with GDB</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Debugging with GDB">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Installing-GDB.html#Installing-GDB" title="Installing GDB">
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<link rel="prev" href="Running-Configure.html#Running-Configure" title="Running Configure">
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<link rel="next" href="Config-Names.html#Config-Names" title="Config Names">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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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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</head>
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<body>
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<div class="node">
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<a name="Separate-Objdir"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Config-Names.html#Config-Names">Config Names</a>,
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Previous: <a rel="previous" accesskey="p" href="Running-Configure.html#Running-Configure">Running Configure</a>,
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Up: <a rel="up" accesskey="u" href="Installing-GDB.html#Installing-GDB">Installing GDB</a>
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<hr>
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</div>
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<h3 class="section">C.3 Compiling <span class="sc">gdb</span> in Another Directory</h3>
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<p>If you want to run <span class="sc">gdb</span> 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><span class="file">configure</span></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><span class="samp">VPATH</span></samp>’ feature (<span class="sc">gnu</span> <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>To build <code>gdb</code> in a separate directory, run <samp><span class="file">configure</span></samp>
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with the ‘<samp><span class="samp">--srcdir</span></samp>’ option to specify where to find the source.
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(You also need to specify a path to find <samp><span class="file">configure</span></samp>
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itself from your working directory. If the path to <samp><span class="file">configure</span></samp>
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would be the same as the argument to ‘<samp><span class="samp">--srcdir</span></samp>’, you can leave out
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the ‘<samp><span class="samp">--srcdir</span></samp>’ option; it is assumed.)
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<p>For example, with version 8.3.0.20190709-git, you can build <span class="sc">gdb</span> in a
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separate directory for a Sun 4 like this:
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<pre class="smallexample"> cd gdb-8.3.0.20190709-git
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mkdir ../gdb-sun4
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cd ../gdb-sun4
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../gdb-8.3.0.20190709-git/configure
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make
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</pre>
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<p>When <samp><span class="file">configure</span></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><span class="file">libiberty.a</span></samp> in the
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directory <samp><span class="file">gdb-sun4/libiberty</span></samp>, and <span class="sc">gdb</span> itself in
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<samp><span class="file">gdb-sun4/gdb</span></samp>.
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<p>Make sure that your path to the <samp><span class="file">configure</span></samp> script has just one
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instance of <samp><span class="file">gdb</span></samp> in it. If your path to <samp><span class="file">configure</span></samp> looks
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like <samp><span class="file">../gdb-8.3.0.20190709-git/gdb/configure</span></samp>, you are configuring only
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one subdirectory of <span class="sc">gdb</span>, not the whole package. This leads to
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build errors about missing include files such as <samp><span class="file">bfd/bfd.h</span></samp>.
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<p>One popular reason to build several <span class="sc">gdb</span> configurations in separate
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directories is to configure <span class="sc">gdb</span> for cross-compiling (where
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<span class="sc">gdb</span> runs on one machine—the <dfn>host</dfn>—while debugging
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programs that run on another machine—the <dfn>target</dfn>).
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You specify a cross-debugging target by
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giving the ‘<samp><span class="samp">--target=</span><var>target</var></samp>’ option to <samp><span class="file">configure</span></samp>.
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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><span class="file">configure</span></samp> (or one of its subdirectories).
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<p>The <code>Makefile</code> that <samp><span class="file">configure</span></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><span class="file">gdb-8.3.0.20190709-git</span></samp> (or in a separate configured
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directory configured with ‘<samp><span class="samp">--srcdir=</span><var>dirname</var><span class="samp">/gdb-8.3.0.20190709-git</span></samp>’), you
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will build all the required libraries, and then build GDB.
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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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</body></html>
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