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<div class="refentry" title="Compiling GLib Applications">
<a name="glib-compiling"></a><div class="titlepage"></div>
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<td valign="top">
<h2><span class="refentrytitle">Compiling GLib Applications</span></h2>
<p>Compiling GLib Applications —
How to compile your GLib application
</p>
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<div class="refsect1" title="Compiling GLib Applications on UNIX">
<a name="id345657"></a><h2>Compiling GLib Applications on UNIX</h2>
<p>
To compile a GLib application, you need to tell the compiler where to
find the GLib header files and libraries. This is done with the
<span class="application">pkg-config</span> utility.
</p>
<p>
The following interactive shell session demonstrates how
<span class="application">pkg-config</span> is used (the actual output on
your system may be different):
</p>
<pre class="programlisting">
$ pkg-config --cflags glib-2.0
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include
$ pkg-config --libs glib-2.0
-L/usr/lib -lm -lglib-2.0
</pre>
<p>
</p>
<p>
If your application uses threads or <span class="structname">GObject</span>
features, it must be compiled and linked with the options returned by the
following <span class="application">pkg-config</span> invocations:
</p>
<pre class="programlisting">
$ pkg-config --cflags --libs gthread-2.0
$ pkg-config --cflags --libs gobject-2.0
</pre>
<p>
</p>
<p>
If your application uses modules, it must be compiled and linked with the options
returned by one of the following <span class="application">pkg-config</span> invocations:
</p>
<pre class="programlisting">
$ pkg-config --cflags --libs gmodule-no-export-2.0
$ pkg-config --cflags --libs gmodule-2.0
</pre>
<p>
The difference between the two is that gmodule-2.0 adds <code class="option">--export-dynamic</code>
to the linker flags, which is often not needed.
</p>
<p>
The simplest way to compile a program is to use the "backticks"
feature of the shell. If you enclose a command in backticks
(<span class="emphasis"><em>not single quotes</em></span>), then its output will be
substituted into the command line before execution. So to compile
a GLib Hello, World, you would type the following:
</p>
<pre class="programlisting">
$ cc `pkg-config --cflags --libs glib-2.0` hello.c -o hello
</pre>
<p>
</p>
<p>
If you want to make sure that your program doesn't use any deprecated
functions, you can define the preprocessor symbol G_DISABLE_DEPRECATED
by using the command line option <code class="literal">-DG_DISABLE_DEPRECATED=1</code>.
</p>
<p>
The recommended way of using GLib has always been to only include the
toplevel headers <code class="filename">glib.h</code>,
<code class="filename">glib-object.h</code>, <code class="filename">gio.h</code>.
Starting with 2.17, GLib enforces this by generating an error
when individual headers are directly included. To help with the
transition, the enforcement is not turned on by default for GLib
headers (it <span class="emphasis"><em>is</em></span> turned on for GObject and GIO).
To turn it on, define the preprocessor symbol G_DISABLE_SINGLE_INCLUDES
by using the command line option <code class="literal">-DG_DISABLE_SINGLE_INCLUDES</code>.
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