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| <h3 class="section">C.3 Compiling <span class="sc">gdb</span> in Another Directory</h3> |
| |
| <p>If you want to run <span class="sc">gdb</span> versions for several host or target machines, |
| you need a different <code>gdb</code> compiled for each combination of |
| host and target. <samp><span class="file">configure</span></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><span class="samp">VPATH</span></samp>’ feature (<span class="sc">gnu</span> <code>make</code> does), running |
| <code>make</code> in each of these directories builds the <code>gdb</code> |
| program specified there. |
| |
| <p>To build <code>gdb</code> in a separate directory, run <samp><span class="file">configure</span></samp> |
| with the ‘<samp><span class="samp">--srcdir</span></samp>’ option to specify where to find the source. |
| (You also need to specify a path to find <samp><span class="file">configure</span></samp> |
| itself from your working directory. If the path to <samp><span class="file">configure</span></samp> |
| would be the same as the argument to ‘<samp><span class="samp">--srcdir</span></samp>’, you can leave out |
| the ‘<samp><span class="samp">--srcdir</span></samp>’ option; it is assumed.) |
| |
| <p>For example, with version 8.3.0.20190709-git, you can build <span class="sc">gdb</span> in a |
| separate directory for a Sun 4 like this: |
| |
| <pre class="smallexample"> cd gdb-8.3.0.20190709-git |
| mkdir ../gdb-sun4 |
| cd ../gdb-sun4 |
| ../gdb-8.3.0.20190709-git/configure |
| make |
| </pre> |
| <p>When <samp><span class="file">configure</span></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><span class="file">libiberty.a</span></samp> in the |
| directory <samp><span class="file">gdb-sun4/libiberty</span></samp>, and <span class="sc">gdb</span> itself in |
| <samp><span class="file">gdb-sun4/gdb</span></samp>. |
| |
| <p>Make sure that your path to the <samp><span class="file">configure</span></samp> script has just one |
| instance of <samp><span class="file">gdb</span></samp> in it. If your path to <samp><span class="file">configure</span></samp> looks |
| like <samp><span class="file">../gdb-8.3.0.20190709-git/gdb/configure</span></samp>, you are configuring only |
| one subdirectory of <span class="sc">gdb</span>, not the whole package. This leads to |
| build errors about missing include files such as <samp><span class="file">bfd/bfd.h</span></samp>. |
| |
| <p>One popular reason to build several <span class="sc">gdb</span> configurations in separate |
| directories is to configure <span class="sc">gdb</span> for cross-compiling (where |
| <span class="sc">gdb</span> runs on one machine—the <dfn>host</dfn>—while debugging |
| programs that run on another machine—the <dfn>target</dfn>). |
| You specify a cross-debugging target by |
| giving the ‘<samp><span class="samp">--target=</span><var>target</var></samp>’ option to <samp><span class="file">configure</span></samp>. |
| |
| <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><span class="file">configure</span></samp> (or one of its subdirectories). |
| |
| <p>The <code>Makefile</code> that <samp><span class="file">configure</span></samp> generates in each source |
| directory also runs recursively. If you type <code>make</code> in a source |
| directory such as <samp><span class="file">gdb-8.3.0.20190709-git</span></samp> (or in a separate configured |
| directory configured with ‘<samp><span class="samp">--srcdir=</span><var>dirname</var><span class="samp">/gdb-8.3.0.20190709-git</span></samp>’), you |
| will build all the required libraries, and then build GDB. |
| |
| <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. |
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