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updated example Makefile and descriptions
git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@1443 3c298f89-4303-0410-b956-a3cf2f4a3e73
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@ -452,31 +452,31 @@ foo-compile: bar-compile
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<p>Finally, here's the hardest part. Create a file named
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<code>Makefile</code>. It will contain the <i>Makefile</i> rules that
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are in charge of downloading, configuring, compiling and installing
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the software. Below is an example that we will comment
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afterwards.</p>
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the software. Below is an example that we will comment afterwards.</p>
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<pre>
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1 # $Id$
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2 include $(TOPDIR)/rules.mk
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3 PKG_NAME:=foo
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4 PKG_VERSION:=1.0
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5 PKG_RELEASE:=1
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6 PKG_MD5SUM:=4584f226523776a3cdd2fb6f8212ba8d
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8 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
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9 PKG_SOURCE_URL:=http://www.foosoftware.org/downloads
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10 PKG_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
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11 PKG_IPK:=$(PACKAGE_DIR)/$(PKG_NAME)_$(PKG_VERSION)-$(PKG_RELEASE)_$(ARCH).ipk
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12 PKG_IPK_DIR:=$(PKG_DIR)/ipkg
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13
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14 $(DL_DIR)/$(PKG_SOURCE):
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15 $(SCRIPT_DIR)/download.pl $(DL_DIR) $(PKG_SOURCE) $(PKG_MD5SUM) $(PKG_SOURCE_URL)
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2
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3 include $(TOPDIR)/rules.mk
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4
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5 PKG_NAME:=foo
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6 PKG_VERSION:=1.0
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7 PKG_RELEASE:=1
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8 PKG_MD5SUM:=4584f226523776a3cdd2fb6f8212ba8d
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9
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10 PKG_SOURCE_URL:=http://www.foosoftware.org/downloads
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11 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
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12 PKG_CAT:=zcat
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13
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14 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
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15 PKG_INSTALL_DIR:=$(PKG_BUILD_DIR)/ipkg-install
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16
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17 $(PKG_DIR)/.source: $(DL_DIR)/$(PKG_SOURCE)
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18 zcat $(DL_DIR)/$(PKG_SOURCE) | tar -C $(BUILD_DIR) $(TAR_OPTIONS) -
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19 touch $(PKG_DIR)/.source
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17 include $(TOPDIR)/package/rules.mk
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18
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19 $(eval $(call PKG_template,FOO,foo,$(PKG_VERSION)-$(PKG_RELEASE),$(ARCH)))
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20
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21 $(PKG_DIR)/.configured: $(PKG_DIR)/.source
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22 (cd $(PKG_DIR); \
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21 $(PKG_BUILD_DIR)/.configured: $(PKG_BUILD_DIR)/.prepared
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22 (cd $(PKG_BUILD_DIR); \
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23 $(TARGET_CONFIGURE_OPTS) \
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24 CFLAGS="$(TARGET_CFLAGS)" \
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25 ./configure \
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@ -485,36 +485,37 @@ foo-compile: bar-compile
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28 --build=$(GNU_HOST_NAME) \
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29 --prefix=/usr \
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30 --sysconfdir=/etc \
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31 );
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32 touch $(PKG_DIR)/.configured;
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33
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34 $(PKG_DIR)/$(PKG_NAME): $(PKG_DIR)/.configured
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35 $(MAKE) CC=$(TARGET_CC) -C $(PKG_DIR)
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36
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37 $(PKG_IPK): $(PKG_DIR)/$(PKG_NAME)
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38 $(SCRIPT_DIR)/make-ipkg-dir.sh $(PKG_IPK_DIR) $(PKG_NAME).control $(PKG_VERSION)-$(PKG_RELEASE) $(ARCH)
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39 $(MAKE) prefix=$(PKG_IPK_DIR)/usr -C $(PKG_DIR) install
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40 rm -Rf $(PKG_IPK_DIR)/usr/man
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41 $(IPKG_BUILD) $(PKG_IPK_DIR) $(PACKAGE_DIR)
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42
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43 $(IPKG_STATE_DIR)/info/$(PKG_NAME).list: $(PKG_IPK)
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44 $(IPKG) install $(PKG_IPK)
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45
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46 prepare: $(PKG_DIR)/.source
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47 compile: $(PKG_IPK)
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48 install: $(IPKG_STATE_DIR)/info/$(PKG_NAME).list
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49 clean:
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50 rm -rf $(PKG_DIR)
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51 rm -f $(PKG_IPK)
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31 --with-bar="$(STAGING_DIR)/usr" \
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32 );
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33 touch $@
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34
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35 $(PKG_BUILD_DIR)/.built:
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36 rm -rf $(PKG_INSTALL_DIR)
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37 mkdir -p $(PKG_INSTALL_DIR)
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38 $(MAKE) -C $(PKG_BUILD_DIR) \
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39 $(TARGET_CONFIGURE_OPTS) \
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40 install_prefix="$(PKG_INSTALL_DIR)" \
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41 all install
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42 touch $@
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43
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44 $(IPKG_FOO):
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46 install -d -m0755 $(IDIR_FOO)/usr/sbin
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47 cp -fpR $(PKG_INSTALL_DIR)/usr/sbin/foo $(IDIR_FOO)/usr/sbin
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49 $(RSTRIP) $(IDIR_FOO)
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50 $(IPKG_BUILD) $(IDIR_FOO) $(PACKAGE_DIR)
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51
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52 mostlyclean:
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53 make -C $(PKG_BUILD_DIR) clean
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54 rm $(PKG_BUILD_DIR)/.built
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</pre>
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<p>First of all, this <i>Makefile</i> example works for a single
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binary software. For other software such as libraries or more
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complex stuff with multiple binaries, it should be adapted. Look at
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the other <code>Makefile</code> files in the <code>package</code>
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the other <code>Makefile</code> files in the <code>package/</code>
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directory.</p>
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<p>At lines 3-12, a couple of useful variables are defined :</p>
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<p>At lines 5-15, a couple of useful variables are defined:</p>
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<ul>
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<li><code>PKG_NAME</code> : The package name, e.g. <i>foo</i>.</li>
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@ -523,45 +524,42 @@ foo-compile: bar-compile
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should be downloaded.</li>
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<li><code>PKG_RELEASE</code> : The release number that will be
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appended to the version number of your <i>ipkg</i> package.
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appended to the version number of your <i>ipkg</i> package.</li>
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<li><code>PKG_MD5SUM</code> : The md5sum of the software archive.
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<li><code>PKG_SOURCE</code> : The name of the tarball of
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your package on the download website of FTP site. As you can see
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<code>PKG_NAME</code> and <code>PKG_VERSION</code> are used.</li>
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<li><code>PKG_MD5SUM</code> : The md5sum of the software archive.</li>
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<li><code>PKG_SOURCE_URL</code> : Space separated list of the HTTP
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or FTP sites from which the archive is downloaded. It must include the complete
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path to the directory where <code>FOO_SOURCE</code> can be
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found.</li>
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<li><code>PKG_DIR</code> : The directory into which the software
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<li><code>PKG_SOURCE</code> : The name of the tarball of
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your package on the download website of FTP site. As you can see
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<code>PKG_NAME</code> and <code>PKG_VERSION</code> are used.</li>
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<li><code>PKG_CAT</code> : The tool needed for extraction of the
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software archive.</li>
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<li><code>PKG_BUILD_DIR</code> : The directory into which the software
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will be configured and compiled. Basically, it's a subdirectory
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of <code>BUILD_DIR</code> which is created upon decompression of
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of <code>BUILD_DIR</code> which is created upon extraction of
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the tarball.</li>
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<li><code>PKG_IPK</code> : The resulting <i>ipkg</i> package
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<li><code>PKG_INSTALL_DIR</code> : The directory into the software
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will be installed. It is a subdirectory of <code>PKG_BUILD_DIR</code>.</li>
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</ul>
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<p>Lines 14-15 defines a target that downloads the tarball from
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the remote site to the download directory
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(<code>DL_DIR</code>).</p>
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<p>In Line 3 and 17 we include common variables and routines to simplify
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the process of ipkg creation. It includes routines to download, verify
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and extract the software package archives.</p>
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<p>Lines 17-19 defines a target and associated rules that
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uncompress the downloaded tarball. As you can see, this target
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depends on the tarball file, so that the previous target (line
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14-15) is called before executing the rules of the current
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target. Uncompressing is followed by <i>touching</i> a hidden file
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to mark the software has having been uncompressed. This trick is
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used everywhere in Buildroot <i>Makefile</i> to split steps
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(download, uncompress, configure, compile, install) while still
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having correct dependencies.</p>
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<p>Line 19 contains the magic line which automatically creates the
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ipkg for us.</p>
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<p>Lines 21-32 defines a target and associated rules that
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<p>Lines 21-33 defines a target and associated rules that
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configures the software. It depends on the previous target (the
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hidden <code>.source</code> file) so that we are sure the software has
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hidden <code>.prepared</code> file) so that we are sure the software has
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been uncompressed. In order to configure it, it basically runs the
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well-known <code>./configure</code>script. As we may be doing
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cross-compilation, <code>target</code>, <code>host</code> and
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@ -571,41 +569,21 @@ foo-compile: bar-compile
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filesystem. Finally it creates a <code>.configured</code> file to
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mark the software as configured.</p>
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<p>Lines 34-35 defines a target and a rule that compiles the
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<p>Lines 35-42 defines a target and a rule that compiles the
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software. This target will create the binary file in the
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compilation directory, and depends on the software being already
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configured (hence the reference to the <code>.configured</code>
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file). It basically runs <code>make</code> inside the source
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directory.</p>
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file). Afterwards it installs the resulting binary into the
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<code>PKG_INSTALL_DIR</code>. It basically runs
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<code>make install</code> inside the source directory.</p>
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<p>Lines 37-41 defines a target and associated rules that create
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the <i>ipkg</i> package which can optionally be embedded into
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the resulting firmware image. It depends on the binary file in
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the source directory, to make sure the software has been compiled.
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It uses the make-ipkg-dir.sh script, which will create the ipkg
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build directory for your package, copy your control file into
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that directory and add version and architecture information.
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Then it calls the <code>install</code> target of the
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software <code>Makefile</code> by passing a <code>prefix</code>
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argument, so that the <code>Makefile</code> doesn't try to install
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the software inside host <code>/usr</code> but inside target
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<code>/usr</code>. After the installation, the
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<code>/usr/man</code> directory inside the target filesystem is
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removed to save space.
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<p>Lines 44-50 defines a target and associated rules that create
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the <i>ipkg</i> package, which can optionally be embedded into
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the resulting firmware image. It manually installs all files you
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want to integrate in your resulting ipkg. <code>RSTRIP</code> will
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recursevily strip all binaries and libraries.
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Finally <code>IPKG_BUILD</code> is called to create the package.</p>
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<p>Line 43 and 44 define the installation target of your package,
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which will embed the software into the target filesystem.</p>
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<p>Lines 46-51 define the main targets that the Makefile in the
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<code>package</code> dir calls.
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<ul>
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<li><code>prepare</code> : Download and unpack the source</li>
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<li><code>compile</code> : Compile the source and create the package</li>
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<li><code>install</code> : Embed the package into the target filesystem</li>
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<li><code>clean</code> : Remove all the files created by the build process</li>
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</ul></p>
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<h3>Conclusion</h3>
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<p>As you can see, adding a software to buildroot is simply a
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@ -614,12 +592,14 @@ foo-compile: bar-compile
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the software.</p>
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<p>If you package software that might be useful for other persons,
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don't forget to send a patch to OpenWrt developers !</p>
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don't forget to send a patch to OpenWrt developers!
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Use the mail address: patches@openwrt.org
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</p>
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<h2><a name="links" id="links"></a>Resources</h2>
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<p>To learn more about OpenWrt Buildroot you can visit this
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website: <a href="http://openwrt.org/">http://openwrt.org/</a></p>
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<p>To learn more about OpenWrt you can visit this website:
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<a href="http://openwrt.org/">http://openwrt.org/</a></p>
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</div>
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</body>
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