<dt><code>CC, CFLAGS, CXX, CXXFLAGS</code></dt>
<dd><p>These environment variables
control the C and C++ compilers used during the build. By default,
-<code>gcc</code> and <code>g++</code> are used with the options
-<code>"-g -O2"</code>.</p>
+<code>gcc</code> and <code>g++</code> are used and the debug/optimisation
+level is left unchanged.</p>
</dd>
<dt><code>LDFLAGS</code></dt>
<dd><p>An environment variable specifying flags to
-pass when linking programs. These are normally empty, but can be used
-to direct the linker to use libraries in nonstandard directories. For
-example, <code>LDFLAGS="-L/usr/X11R6/lib"</code>.</p>
+pass when linking programs. These should be empty and
+<code>PKG_CONFIG_PATH</code> is recommended to be used instead. If needed
+it can be used to direct the linker to use libraries in nonstandard
+directories. For example, <code>LDFLAGS="-L/usr/X11R6/lib"</code>.</p>
</dd>
<dt><code>PKG_CONFIG_PATH</code></dt>
-<dd><p>When available, the
-<code>pkg-config</code> utility is used to search for external libraries
+<dd><p>The
+<code>pkg-config</code> utility is a hard requirement for cofiguring and
+building mesa. It is used to search for external libraries
on the system. This environment variable is used to control the search
path for <code>pkg-config</code>. For instance, setting
<code>PKG_CONFIG_PATH=/usr/X11R6/lib/pkgconfig</code> will search for
There are also a few general options for altering the Mesa build:
</p>
<dl>
-<dt><code>--with-x</code></dt>
-<dd><p>When the X11 development libraries are
-needed, the <code>pkg-config</code> utility <a href="#pkg-config">will
-be used</a> for locating them. If they cannot be found through
-<code>pkg-config</code> a fallback routing using <code>imake</code> will
-be used. In this case, the <code>--with-x</code>,
-<code>--x-includes</code> and <code>--x-libraries</code> options can
-control the use of X for Mesa.</p>
-</dd>
-
-<dt><code>--enable-gl-osmesa</code></dt>
-<dd><p>The <a href="osmesa.html">OSMesa
-library</a> can be built on top of libGL for drivers that provide it.
-This option controls whether to build libOSMesa. By default, this is
-enabled for the Xlib driver and disabled otherwise. Note that this
-option is different than using OSMesa as the driver.</p>
-</dd>
-
<dt><code>--enable-debug</code></dt>
<dd><p>This option will enable compiler
options and macros to aid in debugging the Mesa libraries.</p>
assembly will not be used.</p>
</dd>
-<dt><code>--enable-32-bit</code></dt>
-<dt><code>--enable-64-bit</code></dt>
-<dd><p>By default, the
-build will compile code as directed by the environment variables
-<code>CC</code>, <code>CFLAGS</code>, etc. If the compiler is
-<code>gcc</code>, these options offer a helper to add the compiler flags
-to force 32- or 64-bit code generation as used on the x86 and x86_64
-architectures.</p>
+<dt><code>--build=</code></dt>
+<dt><code>--host=</code></dt>
+<dd><p>By default, the build will compile code for the architecture that
+it's running on. In order to build cross-compile Mesa on a x86-64 machine
+that is to run on a i686, one would need to set the options to:</p>
+
+<p><code>--build=x86_64-pc-linux-gnu --host=i686-pc-linux-gnu</code></p>
+
+Note that these can vary from distribution to distribution. For more
+information check with the
+<a href="https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.69/html_node/Specifying-Target-Triplets.html">
+autoconf manual</a>.
+Note that you will need to correctly set <code>PKG_CONFIG_PATH</code> as well.
+
+
+<p>In some cases a single compiler is capable of handling both architectures
+(multilib) in that case one would need to set the <code>CC,CXX</code> variables
+appending the correct machine options. Seek your compiler documentation for
+further information -
+<a href="https://gcc.gnu.org/onlinedocs/gcc/Submodel-Options.html"> gcc
+machine dependent options</a></p>
+
+<p>In addition to specifying correct <code>PKG_CONFIG_PATH</code> for the target
+architecture, the following should be sufficient to configure multilib Mesa</p>
+
+<code>./configure CC="gcc -m32" CXX="g++ -m32" --build=x86_64-pc-linux-gnu --host=i686-pc-linux-gnu ...</code>
</dd>
</dl>
There are several different driver modes that Mesa can use. These are
described in more detail in the <a href="install.html">basic
installation instructions</a>. The Mesa driver is controlled through the
-configure option --with-driver. There are currently three supported
-options in the configure script.
+configure options <code>--enable-xlib-glx</code>, <code>--enable-osmesa</code>,
+and <code>--enable-dri</code>.
</p>
-<h3 id="xlib">Xlib</h3><p>This is the default mode for building Mesa.
+<h3 id="xlib">Xlib</h3><p>
It uses Xlib as a software renderer to do all rendering. It corresponds
-to the option <code>--with-driver=xlib</code>. The libX11 and libXext
+to the option <code>--enable-xlib-glx</code>. The libX11 and libXext
libraries, as well as the X11 development headers, will be need to
support the Xlib driver.
<h3 id="dri">DRI</h3><p>This mode uses the DRI hardware drivers for
accelerated OpenGL rendering. Enable the DRI drivers with the option
-<code>--
with-driver=dri</code>. See the <a href="install.html">basic
+<code>--
enable-dri</code>. See the <a href="install.html">basic
installation instructions</a> for details on prerequisites for the DRI
drivers.
<dt><code>--enable-glx-tls</code> <dd><p>
Enable Thread Local Storage (TLS) in
GLX.
-<dt><code>--with-expat=DIR</code> <dd> The DRI-enabled libGL uses expat to
+<dt><code>--with-expat=DIR</code>
+<dd><p><strong>DEPRECATED</strong>, use <code>PKG_CONFIG_PATH</code> instead.</p>
+<p>The DRI-enabled libGL uses expat to
parse the DRI configuration files in <code>/etc/drirc</code> and
<code>~/.drirc</code>. This option allows a specific expat installation
to be used. For example, <code>--with-expat=/usr/local</code> will
<h3 id="osmesa">OSMesa </h3><p> No libGL is built in this
mode. Instead, the driver code is built into the Off-Screen Mesa
(OSMesa) library. See the <a href="osmesa.html">Off-Screen Rendering</a>
-page for more details.
+page for more details. It corresponds to the option
+<code>--enable-osmesa</code>.
<!-- OSMesa specific options -->
<dl>
projects / mesa.git / blobdiff