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buildroot.html: Fix grammer and punctuation

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Also, clarified some of the information given.

Signed-off-by: Martin Banky <Martin.Banky@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Martin Banky 2010-10-12 15:17:55 -07:00 committed by Peter Korsgaard
parent 2b504fe1f6
commit cc98404a31
1 changed files with 123 additions and 118 deletions
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docs/buildroot.html
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@ -94,7 +94,7 @@
<p>You might wonder why such a tool is needed when you can compile
<code>gcc</code>, <code>binutils</code>, <code>uClibc</code> and all
the other tools by hand. Of course doing so is possible. But, dealing with
the other tools by hand. Of course doing so is possible but, dealing with
all of the configure options and problems of every <code>gcc</code> or
<code>binutils</code> version is very time-consuming and uninteresting.
Buildroot automates this process through the use of Makefiles and has a
@ -111,7 +111,7 @@
<p>Buildroot releases are made approximately every 3
months. Direct Git access and daily snapshots are also
available if you want more bleeding edge.</p>
available, if you want more bleeding edge.</p>
<p>Releases are available at
<a href="http://buildroot.net/downloads/">http://buildroot.net/downloads/</a>.</p>
@ -121,7 +121,7 @@
and previous snapshots are also available at
<a href="http://buildroot.net/downloads/snapshots/">http://buildroot.net/downloads/snapshots/</a>.</p>
<p>To download Buildroot using Git you can simply follow
<p>To download Buildroot using Git, you can simply follow
the rules described on the &quot;Accessing Git&quot; page
(<a href= "http://buildroot.net/git.html">http://buildroot.net/git.html</a>)
of the Buildroot website
@ -166,7 +166,7 @@
the <code>libncurses5-dev</code> package is required to use the <i>
menuconfig</i> interface, <code>libqt3-mt-dev</code> is required to use
the <i>xconfig</i> interface, and <code>libglib2.0-dev, libgtk2.0-dev
and libglade2-dev</code> are needed to used the <i>gconfig</i> interface.</p>
and libglade2-dev</code> are needed to use the <i>gconfig</i> interface.</p>
<p>For each menu entry in the configuration tool, you can find associated
help that describes the purpose of the entry.</p>
@ -218,10 +218,10 @@
libraries and applications for the target that depend on other
libraries.</li>
<li><code>target/</code> which contains <i>almost</i> the root
filesystem for the target: everything needed is present except the
device files in <code>/dev/</code> (Buildroot can't create them
because Buildroot doesn't run as root and does not want to run as
<li><code>target/</code> which contains <i>almost</i> the complete
root filesystem for the target: everything needed is present except
the device files in <code>/dev/</code> (Buildroot can't create them
because Buildroot doesn't run as root and doesn't want to run as
root). Therefore, this directory <b>should not be used on your target</b>.
Instead, you should use one of the images built in the
<code>images/</code> directory. If you need an extracted image of the
@ -229,10 +229,12 @@
generated in <code>images/</code> and extract it as root.<br/>Compared
to <code>staging/</code>, <code>target/</code> contains only the
files and libraries needed to run the selected target applications:
the development files (headers, etc.) are not present.</li>
the development files (headers, etc.) are not present, unless the
<code>development files in target filesystem</code> option is selected.
</li>
<li><code>host/</code> contains the installation of tools compiled for
the host that are needed for the proper execution of Buildroot except
the host that are needed for the proper execution of Buildroot, except
for the cross-compilation toolchain which is installed under
<code>staging/</code>.</li>
@ -287,13 +289,13 @@
<h3 id="environment_variables">Environment variables</h3>
<p>Buildroot also honors some environment variables when they are passed
<p>Buildroot also honors some environment variables, when they are passed
to <code>make</code> or set in the environment:</p>
<ul>
<li><code>HOSTCXX</code>, the host C++ compiler to use</li>
<li><code>HOSTCC</code>, the host C compiler to use</li>
<li><code>UCLIBC_CONFIG_FILE=&lt;path/to/.config&gt;</code>, path to
the uClibc configuration file to use to compile uClibc if an
the uClibc configuration file, used to compile uClibc, if an
internal toolchain is being built</li>
<li><code>BUSYBOX_CONFIG_FILE=&lt;path/to/.config&gt;</code>, path to
the Busybox configuration file</li>
@ -305,14 +307,14 @@
in your $HOME:</p>
<pre>
$ make UCLIBC_CONFIG_FILE=uClibc.config BUSYBOX_CONFIG_FILE=$HOME/bb.config
$ make UCLIBC_CONFIG_FILE=uClibc.config BUSYBOX_CONFIG_FILE=$HOME/bb.config
</pre>
<p>If you want to use a compiler other than the default <code>gcc</code>
or <code>g++</code> for building helper-binaries on your host, then do</p>
<pre>
$ make HOSTCXX=g++-4.3-HEAD HOSTCC=gcc-4.3-HEAD
$ make HOSTCXX=g++-4.3-HEAD HOSTCC=gcc-4.3-HEAD
</pre>
<h2 id="custom_targetfs">Customizing the generated target filesystem</h2>
@ -335,20 +337,20 @@ $ make HOSTCXX=g++-4.3-HEAD HOSTCC=gcc-4.3-HEAD
can't do everything on this target filesystem skeleton, but changes to
it do remain even if you completely rebuild the cross-compilation
toolchain and the tools. <br /> You can also customize the <code>
target/generic/device_table.txt</code> file which is used by the
target/generic/device_table.txt</code> file, which is used by the
tools that generate the target filesystem image to properly set
permissions and create device nodes.<br /> These customizations are
deployed into <code>output/target/</code> just before the actual image
is made. Simply rebuilding the image by running make should propagate
any new changes to the image.</li>
<li>Add support for your own target in Buildroot so that you
<li>Add support for your own target in Buildroot, so that you
have your own target skeleton (see <a href="#board_support">this
section</a> for details).</li>
<li>In the Buildroot configuration, you can specify the path to a
post-build script that gets called <i>after</i> Buildroot builds all
the selected software but <i>before</i> the the rootfs packages are
post-build script, that gets called <i>after</i> Buildroot builds all
the selected software, but <i>before</i> the rootfs packages are
assembled. The destination root filesystem folder is given as the
first argument to this script, and this script can then be used to
copy programs, static data or any other needed file to your target
@ -360,7 +362,7 @@ $ make HOSTCXX=g++-4.3-HEAD HOSTCC=gcc-4.3-HEAD
<li>A special package, <i>customize</i>, stored in
<code>package/customize</code> can be used. You can put all the
files that you want to see in the final target root filesystem
in <code>package/customize/source</code> and then enable this
in <code>package/customize/source</code>, and then enable this
special package in the configuration system.</li>
</ul>
@ -368,10 +370,10 @@ $ make HOSTCXX=g++-4.3-HEAD HOSTCC=gcc-4.3-HEAD
<p><a href="http://www.busybox.net/">Busybox</a> is very configurable,
and you may want to customize it. You can follow these simple steps to
do so. This method isn't optimal, but it's simple and it works:</p>
do so. This method isn't optimal, but it's simple, and it works:</p>
<ol>
<li>Do an initial compilation of Buildroot with busybox without
<li>Do an initial compilation of Buildroot, with busybox, without
trying to customize it.</li>
<li>Invoke <code>make busybox-menuconfig</code>.
@ -382,8 +384,8 @@ $ make HOSTCXX=g++-4.3-HEAD HOSTCC=gcc-4.3-HEAD
</ol>
<p>Otherwise, you can simply change the
<code>package/busybox/busybox-&lt;version&gt;.config</code> file if you
know the options you want to change without using the configuration tool.
<code>package/busybox/busybox-&lt;version&gt;.config</code> file, if you
know the options you want to change, without using the configuration tool.
</p>
<p>If you want to use an existing config file for busybox, then see
@ -391,8 +393,8 @@ $ make HOSTCXX=g++-4.3-HEAD HOSTCC=gcc-4.3-HEAD
<h2 id="custom_uclibc">Customizing the uClibc configuration</h2>
<p>Just like <a href="#custom_busybox">BusyBox</a>, <a
href="http://www.uclibc.org/">uClibc</a> offers a lot of
<p>Just like <a href="#custom_busybox">BusyBox</a>,
<a href="http://www.uclibc.org/">uClibc</a> offers a lot of
configuration options. They allow you to select various
functionalities depending on your needs and limitations.</p>
@ -420,7 +422,7 @@ $ make HOSTCXX=g++-4.3-HEAD HOSTCC=gcc-4.3-HEAD
<p>Otherwise, you can simply change
<code>toolchain/uClibc/uClibc.config</code> or
<code>toolchain/uClibc/uClibc.config-locale</code> without running
<code>toolchain/uClibc/uClibc.config-locale</code>, without running
the configuration assistant.</p>
<p>If you want to use an existing config file for uclibc, then see
@ -428,11 +430,12 @@ $ make HOSTCXX=g++-4.3-HEAD HOSTCC=gcc-4.3-HEAD
<h2 id="custom_linux26">Customizing the Linux kernel configuration</h2>
<p>The Linux kernel configuration can be customized just like <a
href="#custom_busybox">BusyBox</a> and <a href="#custom_uclibc">uClibc</a>
using <code>make linux26-menuconfig</code>. Make sure you have
enabled the kernel build in <code>make menuconfig</code> first.
Once done, run <code>make</code> to (re)build everything.</p>
<p>The Linux kernel configuration can be customized just like
<a href="#custom_busybox">BusyBox</a> and
<a href="#custom_uclibc">uClibc</a> using <code>make linux26-menuconfig
</code>. Make sure you have enabled the kernel build in <code>make
menuconfig</code> first. Once done, run <code>make</code> to (re)build
everything.</p>
<p>If you want to use an existing config file for Linux, then see
section <a href="#environment_variables">environment variables</a>.</p>
@ -501,13 +504,13 @@ $(ZLIB_DIR)/libz.a: $(ZLIB_DIR)/.configured
<code>output/build/zlib-version/libz.a</code>.</p>
<p>Note that most packages, if not all, will progressively be
ported over the generic or the autotools infrastructure, making it
ported over to the generic or autotools infrastructure, making it
much easier to rebuild individual packages.</p>
<h2 id="buildroot_innards">How Buildroot works</h2>
<p>As mentioned above, Buildroot is basically a set of Makefiles that
downloads, configures and compiles software with the correct options. It
download, configure, and compile software with the correct options. It
also includes patches for various software packages &mdash; mainly the
ones involved in the cross-compilation tool chain (<code>gcc</code>,
<code>binutils</code> and <code>uClibc</code>).</p>
@ -632,7 +635,7 @@ endif
<code>BOARD_PATH</code> variable set to
<code>target/device/yourcompany/project-foobar</code> as it
will simplify further definitions. Then, the file might define
one or several of the following variables:
one or more of the following variables:
<ul>
<li><code>TARGET_SKELETON</code> to a directory that contains
the target skeleton for your project. If this variable is
@ -658,7 +661,7 @@ endif
<h2 id="using_toolchain">Using the generated toolchain outside Buildroot</h2>
<p>You may want to compile for your target your own programs or other
<p>You may want to compile, for your target, your own programs or other
software that are not packaged in Buildroot. In order to do this you can
use the toolchain that was generated by Buildroot.</p>
@ -686,7 +689,7 @@ endif
downloaded by the Makefiles are all stored in the <code>DL_DIR</code>
which by default is the <code>dl</code> directory. It's useful, for
example, if you want to keep a complete version of Buildroot which is
know to be working with the associated tarballs. This will allow you to
known to be working with the associated tarballs. This will allow you to
regenerate the toolchain and the target filesystem with exactly the same
versions.</p>
@ -695,7 +698,7 @@ endif
link from the <code>dl</code> directory to the shared download location:</p>
<pre>
ln -s &lt;shared download location&gt; dl
$ ln -s &lt;shared download location&gt; dl
</pre>
<p>Another way of accessing a shared download location is to
@ -705,7 +708,7 @@ ln -s &lt;shared download location&gt; dl
<code>&quot;~/.bashrc&quot;</code>.</p>
<pre>
export BUILDROOT_DL_DIR &lt;shared download location&gt;
$ export BUILDROOT_DL_DIR &lt;shared download location&gt;
</pre>
<h2 id="external_toolchain">Using an external toolchain</h2>
@ -718,7 +721,7 @@ export BUILDROOT_DL_DIR &lt;shared download location&gt;
<i>uClibc</i>). Buildroot supports using an <i>external
toolchain</i>.</p>
<p>To enable the use of an external toolchain, go in the
<p>To enable the use of an external toolchain, go to the
<code>Toolchain</code> menu, and :</p>
<ul>
@ -747,10 +750,10 @@ export BUILDROOT_DL_DIR &lt;shared download location&gt;
<h2 id="add_packages">Adding new packages to Buildroot</h2>
<p>This section covers how new packages (userspace libraries or
applications) can be integrated into Buildroot. It also allows to
understand how existing packages are integrated, which is needed to fix
issues or tune their configuration.</p>
<p>This section covers how new packages (userspace libraries or
applications) can be integrated into Buildroot. It also shows how existing
packages are integrated, which is needed for fixing issues or tuning their
configuration.</p>
<ul>
<li><a href="#package-directory">Package directory</a></li>
@ -770,13 +773,12 @@ export BUILDROOT_DL_DIR &lt;shared download location&gt;
<h3 id="package-directory">Package directory</h3>
<p>First of all, create a directory under the <code>package</code>
directory for your software, for example <code>foo</code>.</p>
directory for your software, for example <code>libfoo</code>.</p>
<p>Some packages have been grouped by topic in a sub-directory:
<code>multimedia</code>, <code>java</code>, <code>databases</code>,
<code>editors</code>, <code>x11r7</code>, <code>games</code>. If your
package fits in one of these categories, then create your package
directory in these.</p>
<code>multimedia</code>, <code>java</code>, <code>x11r7</code>, and
<code>games</code>. If your package fits in one of these
categories, then create your package directory in these.</p>
<h3 id="config-in-file"><code>Config.in</code> file</h3>
@ -816,35 +818,35 @@ source "package/libfoo/Config.in"
<h3 id="mk-file">The <code>.mk</code> file</h3>
<p>Finally, here's the hardest part. Create a file named
<code>foo.mk</code>. It describes how the package should be
<code>libfoo.mk</code>. It describes how the package should be
downloaded, configured, built, installed, etc.</p>
<p>Depending on the package type, the <code>.mk</code> file must be
written in a different way, using different infrastructures:</p>
<ul>
<li>Makefiles for generic packages (not using autotools), based on an
infrastructure similar to the one used for autotools-based packages,
but which requires a little more work from the developer : specify
what should be done at for the configuration, compilation, installation
and cleanup of the package. This infrastructure must be used for all
packages that do not use the autotools as their build system. In the
future, other specialized infrastructures might be written for other
build systems.<br/>We cover them through a
<a href="#generic-tutorial">tutorial</a> and a
<li><b>Makefiles for generic packages</b> (not using autotools): These
are based on an infrastructure similar to the one used for
autotools-based packages, but requires a little more work from the
developer. They specify what should be done for the configuration,
compilation, installation and cleanup of the package. This
infrastructure must be used for all packages that do not use the
autotools as their build system. In the future, other specialized
infrastructures might be written for other build systems.<br/>We cover
them through a <a href="#generic-tutorial">tutorial</a> and a
<a href="#generic-reference">reference</a>.</li>
<li>Makefiles for autotools-based (autoconf, automake, etc.) software.
We provide a dedicated infrastructure for such packages, since
autotools is a very common build system. This infrastructure <i>must
<li><b>Makefiles for autotools-based software</b> (autoconf, automake,
etc.): We provide a dedicated infrastructure for such packages, since
autotools is a very common build system. This infrastructure <i>must
</i> be used for new packages that rely on the autotools as their
build system.<br/>We cover them through a
<a href="#autotools-tutorial">tutorial</a> and a
<a href="#autotools-reference">reference</a>.</li>
<li>Manual Makefiles. These are currently obsolete and no new manual
Makefiles should be added. However, since there are still many of them
in the tree and because the , we keep them documented in a
<li><b>Manual Makefiles:</b> These are currently obsolete, and no new
manual Makefiles should be added. However, since there are still many
of them in the tree, we keep them documented in a
<a href="#manual-tutorial">tutorial</a>.</li>
</ul>
@ -880,7 +882,7 @@ source "package/libfoo/Config.in"
<span style="color: #000000">27:</span><span style="color: #009900"> $(eval $(call GENTARGETS,package,libfoo))</span>
</pre>
<p>The Makefile begins on line 6 to 8 by metadata informations: the
<p>The Makefile begins on line 6 to 8 with metadata information: the
version of the package (<code>LIBFOO_VERSION</code>), the name of the
tarball containing the package (<code>LIBFOO_SOURCE</code>) and the
Internet location at which the tarball can be downloaded
@ -890,7 +892,7 @@ source "package/libfoo/Config.in"
name is defined).</p>
<p>On line 9, we specify that this package wants to install something to
the staging space. This is often needed for libraries since they must
the staging space. This is often needed for libraries, since they must
install header files and other development files in the staging space.
This will ensure that the commands listed in the
<code>LIBFOO_INSTALL_STAGING_CMDS</code> variable will be executed.</p>
@ -932,13 +934,13 @@ source "package/libfoo/Config.in"
<li>The second argument is the lower-cased package name. It must match
the prefix of the variables in the <code>.mk</code> file and must
match the configuration option name in the <code>Config.in</code>
file. For example, if the package name is <code>libfoo</code>, so the
variables in the <code>.mk</code> must start with
file. For example, if the package name is <code>libfoo</code>, then the
variables in the <code>.mk</code> file must start with
<code>LIBFOO_</code> and the configuration option in the
<code>Config.in</code> file must be <code>BR2_PACKAGE_LIBFOO</code>.</li>
<li>The third argument is optional. It can be used to tell if the
package if a target package (cross-compiled for the target) or a host
package is a target package (cross-compiled for the target) or a host
package (natively compiled for the host). If unspecified, it is
assumed that it is a target package. See below for details.</li>
</ul>
@ -958,7 +960,7 @@ $(eval $(call GENTARGETS,package,libfoo,host))
<code>libfoo</code>, then the name of the package for the target is also
<code>libfoo</code>, while the name of the package for the host is
<code>host-libfoo</code>. These names should be used in the DEPENDENCIES
variables of other packages if they depend on <code>libfoo</code> or
variables of other packages, if they depend on <code>libfoo</code> or
<code>host-libfoo</code>.</p>
<p>The call to the <code>GENTARGETS</code> macro <b>must</b> be at the
@ -975,14 +977,14 @@ $(eval $(call GENTARGETS,package,libfoo,host))
details.</p>
<p>The list of variables that can be set in a <code>.mk</code> file to
give metadata informations is (assuming the package name is
give metadata information is (assuming the package name is
<code>libfoo</code>) :</p>
<ul>
<li><code>LIBFOO_VERSION</code>, mandatory, must contain the version
of the package. Note that if <code>HOST_LIBFOO_VERSION</code> doesn't
exist, it is assumed to be the same as <code>LIBFOO_VERSION</code>.
<br/>Example: <code>LIBFOO_VERSION=0.1.2</code></li>
exist, it is assumed to be the same as <code>LIBFOO_VERSION</code>.<br/>
Example: <code>LIBFOO_VERSION = 0.1.2</code></li>
<li><code>LIBFOO_SOURCE</code> may contain the name of the tarball of
the package. If <code>HOST_LIBFOO_SOURCE</code> is not specified, it
@ -1006,7 +1008,7 @@ $(eval $(call GENTARGETS,package,libfoo,host))
specified, then the location is assumed to be
<code>http://$$(BR2_SOURCEFORGE_MIRROR).dl.sourceforge.net/sourceforge/packagename</code>.
<br/>Example:
<code>LIBFOO_SITE=http://www.foosoftware.org/libfoo</code>.</li>
<code>LIBFOO_SITE=http://www.libfoosoftware.org/libfoo</code>.</li>
<li><code>LIBFOO_DEPENDENCIES</code> lists the dependencies (in terms
of package name) that are required for the current target package to
@ -1029,7 +1031,7 @@ $(eval $(call GENTARGETS,package,libfoo,host))
syntax:</p>
<pre>
LIBFOO_VERSION=2.32
LIBFOO_VERSION = 2.32
</pre>
<p>Now, the variables that define what should be performed at the
@ -1053,9 +1055,11 @@ LIBFOO_VERSION=2.32
to be performed to install the package to the target directory, when
the package is a target package. The package must install its files to
the directory given by <code>$(TARGET_DIR)</code>. Only the files
required for <i>execution</i> of the package
should be installed. Header files and documentation should not be
installed.</li>
required for <i>documentation</i> and <i>execution</i> of the package
should be installed. Header files should not be installed, they will
be copied to the target, if the
<code>development files in target filesystem</code> option is selected.
</li>
<li><code>LIBFOO_INSTALL_STAGING_CMDS</code>, used to list the actions
to be performed to install the package to the staging directory, when
@ -1104,12 +1108,16 @@ endef
</ul>
<p>The last feature of the generic infrastructure is the ability to add
hook more actions after existing steps. These hooks aren't really useful
for generic packages, since the <code>.mk</code> file already has full
control over the actions performed in each step of the package
construction. The hooks are more useful for packages using the autotools
infrastructure described below. But since they are provided by the
generic infrastructure, they are documented here.</p>
hooks. These define further actions to perform after existing steps.
Most hooks aren't really useful for generic packages, since the
<code>.mk</code> file already has full control over the actions
performed in each step of the package construction. The hooks are more
useful for packages using the autotools infrastructure described below.
However, since they are provided by the generic infrastructure, they are
documented here. The exception is <code>LIBFOO_POST_PATCH_HOOKS</code>.
Patching the package is not user definable, so
<code>LIBFOO_POST_PATCH_HOOKS</code> will be userful for generic packages.
</p>
<p>The following hook points are available:</p>
@ -1122,7 +1130,7 @@ endef
<li><code>LIBFOO_POST_INSTALL_TARGET_HOOKS</code> (for target packages only)</li>
</ul>
<p>This variables are <i>lists</i> of variable names containing actions
<p>These variables are <i>lists</i> of variable names containing actions
to be performed at this hook point. This allows several hooks to be
registered at a given hook point. Here is an example:</p>
@ -1205,7 +1213,7 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
works by defining a number of variables before calling the
<code>AUTOTARGETS</code> macro.</p>
<p>First, all the package meta-information variables that exist in the
<p>First, all the package metadata information variables that exist in the
generic infrastructure also exist in the autotools infrastructure:
<code>LIBFOO_VERSION</code>, <code>LIBFOO_SOURCE</code>,
<code>LIBFOO_PATCH</code>, <code>LIBFOO_SITE</code>,
@ -1230,11 +1238,11 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
options to pass to the configure script. By default, empty.</li>
<li><code>LIBFOO_MAKE</code>, to specify an alternate <code>make</code>
command. This is typically useful when parallel make it enabled in
command. This is typically useful when parallel make is enabled in
the configuration (using <code>BR2_JLEVEL</code>) but that this
feature should be disabled for the given package, for one reason or
another. By default, set to <code>$(MAKE)</code>. If parallel building
is not supported by the package, then it should do
is not supported by the package, then it should be set to
<code>LIBFOO_MAKE=$(MAKE1)</code>.</li>
<li><code>LIBFOO_MAKE_ENV</code>, to specify additional environment
@ -1261,11 +1269,11 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
default, the value is <code>YES</code></li>
<li><code>LIBFOO_USE_CONFIG_CACHE</code> tells whether the configure
script should really on a cache file that caches test results from
previous configure script. Usually, this variable should be left to
its default value. Only for specific packages having issues with the
configure cache can set this variable to the <code>NO</code> value
(but this is more a work-around than a really fix)</li>
script should use the central configure cache, which caches test
results from previous configure scripts. Usually, this variable should
be left to its default value. Only packages having issues with the
configure cache, can set this variable to the <code>NO</code> value
(but this is more of a work-around than a fix)</li>
<li><code>LIBFOO_INSTALL_STAGING_OPT</code> contains the make options
used to install the package to the staging directory. By default, the
@ -1275,12 +1283,9 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
<li><code>LIBFOO_INSTALL_TARGET_OPT</code> contains the make options
used to install the package to the target directory. By default, the
value is <code>DESTDIR=$$(TARGET_DIR) install-strip</code> if
<code>BR2_ENABLE_DEBUG</code> is not set, and
<code>DESTDIR=$$(TARGET_DIR) install-exec</code> if
<code>BR2_ENABLE_DEBUG</code> is set. These default values are correct
for most autotools packages, but it is still possible to override them
if needed.</li>
value is <code>DESTDIR=$$(TARGET_DIR) install</code>. The default
value is correct for most autotools packages, but it is still possible
to override it if needed.</li>
<li><code>LIBFOO_CLEAN_OPT</code> contains the make options used to
clean the package. By default, the value is <code>clean</code>.</li>
@ -1297,7 +1302,7 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
<p>With the autotools infrastructure, all the steps required to build
and install the packages are already defined, and they generally work
well for most autotools-based packages. However, when required, it is
still possible to customize what is done in particular step:</p>
still possible to customize what is done in any particular step:</p>
<ul>
<li>By adding a post-operation hook (after extract, patch, configure,
@ -1305,7 +1310,7 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
infrastructure for details.</li>
<li>By overriding one of the steps. For example, even if the autotools
infrastructure is used, if the package <code>.mk</code> defines its
infrastructure is used, if the package <code>.mk</code> file defines its
own <code>LIBFOO_CONFIGURE_CMDS</code> variable, it will be used
instead of the default autotools one. However, using this method
should be restricted to very specific cases. Do not use it in the
@ -1317,7 +1322,7 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
<p><b>NOTE: new manual makefiles should not be created, and existing
manual makefiles should be converted either to the generic
infrastructure or the autotools infrastructure. This section is only
kept to document the existing manual makefiles and help understanding
kept to document the existing manual makefiles and to help understand
how they work.</b></p>
<pre>
@ -1419,11 +1424,11 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
<p>Lines <a href="#ex2line16">16-18</a> define a target and associated
rules that uncompress the downloaded tarball. As you can see, this
target depends on the tarball file so that the previous target (lines <a
href="#ex2line13">13-14</a>) is called before executing the rules of the
current target. Uncompressing is followed by <i>touching</i> a hidden
file to mark the software as having been uncompressed. This trick is
used everywhere in a Buildroot Makefile to split steps (download,
target depends on the tarball file so that the previous target (lines
<a href="#ex2line13">13-14</a>) is called before executing the rules of
the current target. Uncompressing is followed by <i>touching</i> a
hidden file to mark the software as having been uncompressed. This trick
is used everywhere in a Buildroot Makefile to split steps (download,
uncompress, configure, compile, install) while still having correct
dependencies.</p>
@ -1435,7 +1440,7 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
cross-compilation, <code>target</code>, <code>host</code> and
<code>build</code> arguments are given. The prefix is also set to
<code>/usr</code>, not because the software will be installed in
<code>/usr</code> on your host system, but because the software will bin
<code>/usr</code> on your host system, but because the software will be
installed in <code> /usr</code> on the target filesystem. Finally it
creates a <code>.configured</code> file to mark the software as
configured.</p>
@ -1458,7 +1463,7 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
to save space. </p>
<p>Line <a href="#ex2line40">40</a> defines the main target of the
software &mdash; the one that will be eventually be used by the top level
software &mdash; the one that will eventually be used by the top level
<code>Makefile</code> to download, compile, and then install this
package. This target should first of all depend on all needed
dependencies of the software (in our example, <i>uclibc</i> and
@ -1468,13 +1473,13 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
<p>Line <a href="#ex2line42">42</a> defines a simple target that only
downloads the code source. This is not used during normal operation of
Buildroot, but is needed if you intend to download all required sources
at once for later offline build. Note that if you add a new package
at once for later offline build. Note that if you add a new package,
providing a <code>libfoo-source</code> target is <i>mandatory</i> to
support users that wish to do offline-builds. Furthermore it eases
support users that wish to do offline-builds. Furthermore, it eases
checking if all package-sources are downloadable.</p>
<p>Lines <a href="#ex2line44">44-46</a> define a simple target to clean
the software build by calling the Makefiles with the appropriate option.
the software build by calling the Makefile with the appropriate options.
The <code>-clean</code> target should run <code>make clean</code> on
$(BUILD_DIR)/package-version and MUST uninstall all files of the package
from $(STAGING_DIR) and from $(TARGET_DIR).</p>
@ -1485,7 +1490,7 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
completely rm $(BUILD_DIR)/ package-version.</p>
<p>Lines <a href="#ex2line51">51-58</a> add the target <code>libfoo</code>
to the list of targets to be compiled by Buildroot by first checking if
to the list of targets to be compiled by Buildroot, by first checking if
the configuration option for this package has been enabled using the
configuration tool. If so, it then &quot;subscribes&quot; this package
to be compiled by adding the package to the TARGETS global variable.
@ -1497,14 +1502,14 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
<h3 id="gettext-integration">Gettext integration and interaction with packages</h3>
<p>Many packages that support internationalization use the gettext
library. Dependency on this library are fairly complicated and therefore
deserves a few explanations.</p>
library. Dependencies for this library are fairly complicated and therefore,
deserves some explanation.</p>
<p>The <i>uClibc</i> C library doesn't implement gettext functionality,
therefore with this C library, a separate gettext must be compiled. On
the other hand, the <i>glibc</i> C library does integrate its own
gettext, and in this case, the separate gettext library should not be
compiled, because it creates various kind of build failures.</p>
compiled, because it creates various kinds of build failures.</p>
<p>Additionally, some packages (such as libglib2) do require gettext
unconditionally, while other packages (those who support
@ -1525,7 +1530,7 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
<ol>
<li>Use <code>select BR2_PACKAGE_GETTEXT if BR2_NEEDS_GETTEXT</code>
and possibly <code>select BR2_PACKAGE_LIBINTL if BR2_NEEDS_GETTEXT</code>
and possibly <code>select BR2_PACKAGE_LIBINTL if BR2_NEEDS_GETTEXT</code>,
if libintl is also needed</li>
<li>Use <code>$(if $(BR2_NEEDS_GETTEXT),gettext)</code> in the package
@ -1539,7 +1544,7 @@ LIBFOO_POST_PATCH_HOOKS += LIBFOO_POST_PATCH_FIXUP
<li>Use
<code>select BR2_PACKAGE_GETTEXT if BR2_NEEDS_GETTEXT_IF_LOCALE</code>
and possibly
<code>select BR2_PACKAGE_LIBINTL if BR2_NEEDS_GETTEXT_IF_LOCALE</code>
<code>select BR2_PACKAGE_LIBINTL if BR2_NEEDS_GETTEXT_IF_LOCALE</code>,
if libintl is also needed</li>
<li>Use <code>$(if $(BR2_NEEDS_GETTEXT_IF_LOCALE),gettext)</code> in