106 lines
5.2 KiB
HTML
106 lines
5.2 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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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 no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>Linking Guile with Libraries (Guile Reference Manual)</title>
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<meta name="description" content="Linking Guile with Libraries (Guile Reference Manual)">
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<meta name="keywords" content="Linking Guile with Libraries (Guile Reference Manual)">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" 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="Programming-in-C.html" rel="up" title="Programming in C">
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<link href="General-Libguile-Concepts.html" rel="next" title="General Libguile Concepts">
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<link href="Linking-Programs-With-Guile.html" rel="prev" title="Linking Programs With Guile">
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<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
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</head>
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<body lang="en">
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<div class="section-level-extent" id="Linking-Guile-with-Libraries">
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<div class="nav-panel">
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<p>
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Next: <a href="General-Libguile-Concepts.html" accesskey="n" rel="next">General concepts for using libguile</a>, Previous: <a href="Linking-Programs-With-Guile.html" accesskey="p" rel="prev">Linking Programs With Guile</a>, Up: <a href="Programming-in-C.html" accesskey="u" rel="up">Programming in C</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<h3 class="section" id="Linking-Guile-with-Libraries-1"><span>5.3 Linking Guile with Libraries<a class="copiable-link" href="#Linking-Guile-with-Libraries-1"> ¶</a></span></h3>
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<p>The previous section has briefly explained how to write programs that
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make use of an embedded Guile interpreter. But sometimes, all you
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want to do is make new primitive procedures and data types available
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to the Scheme programmer. Writing a new version of <code class="code">guile</code> is
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inconvenient in this case and it would in fact make the life of the
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users of your new features needlessly hard.
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</p>
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<p>For example, suppose that there is a program <code class="code">guile-db</code> that is a
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version of Guile with additional features for accessing a database.
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People who want to write Scheme programs that use these features would
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have to use <code class="code">guile-db</code> instead of the usual <code class="code">guile</code> program.
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Now suppose that there is also a program <code class="code">guile-gtk</code> that extends
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Guile with access to the popular Gtk+ toolkit for graphical user
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interfaces. People who want to write GUIs in Scheme would have to use
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<code class="code">guile-gtk</code>. Now, what happens when you want to write a Scheme
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application that uses a GUI to let the user access a database? You
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would have to write a <em class="emph">third</em> program that incorporates both the
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database stuff and the GUI stuff. This might not be easy (because
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<code class="code">guile-gtk</code> might be a quite obscure program, say) and taking this
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example further makes it easy to see that this approach can not work in
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practice.
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</p>
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<p>It would have been much better if both the database features and the GUI
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feature had been provided as libraries that can just be linked with
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<code class="code">guile</code>. Guile makes it easy to do just this, and we encourage you
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to make your extensions to Guile available as libraries whenever
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possible.
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</p>
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<p>You write the new primitive procedures and data types in the normal
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fashion, and link them into a shared library instead of into a
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stand-alone program. The shared library can then be loaded dynamically
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by Guile.
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</p>
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<ul class="mini-toc">
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<li><a href="A-Sample-Guile-Extension.html" accesskey="1">A Sample Guile Extension</a></li>
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</ul>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="General-Libguile-Concepts.html">General concepts for using libguile</a>, Previous: <a href="Linking-Programs-With-Guile.html">Linking Programs With Guile</a>, Up: <a href="Programming-in-C.html">Programming in C</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" 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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