// -*- mode:doc; -*-
// vim: set syntax=asciidoc:

Infrastructure for autotools-based packages
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[[auto-package-tutorial]]

First, let's see how to write a +Makefile+ file for an autotools-based
package, with an example:

------------------------
01: # This file is part of the OpenADK project. OpenADK is copyrighted
02: # material, please see the LICENCE file in the top-level directory.
03: 
04: include ${TOPDIR}/rules.mk
05:
06: PKG_NAME:=		libfoo
07: PKG_VERSION:=	1.0
08: PKG_RELEASE:=	1
09: PKG_MD5SUM:=	ba526cd8f4403a5d351a9efaa8608fbc
10: PKG_DESCR:=		foo library
11: PKG_SECTION:=	libs
12: PKG_BUILDDEP:=	openssl
13: PKG_DEPENDS:=	libopenssl
14: PKG_URL:=		http://www.libfoo.org/
15: PKG_SITES:=		http://downloads.libfoo.org/
16:
17: include ${TOPDIR}/mk/package.mk
18:
19: $(eval $(call PKG_template,LIBFOO,libfoo,${PKG_VERSION}-${PKG_RELEASE},${PKG_DEPENDS},${PKG_DESCR},${PKG_SECTION}))
20:
21: libfoo-install:
22:	${INSTALL_DIR} ${IDIR_LIBFOO}/usr/lib
23:	${CP} ${WRKINST}/usr/lib/libfoo.so* ${IDIR_LIBFOO}/usr/lib
24:
25: include ${TOPDIR}/mk/pkg-bottom.mk

------------------------

The Makefile begins with line 4 with the inclusion of the top level rules.mk
file.  After that the Makefile starts on line 6 to 15 with metadata
information: the name of the package (+PKG_NAME+), the version of the package
(+PKG_VERSION+), the release number of the package (+PKG_RELEASE+), which is
used in OpenADK to mark any package updates, the md5 hash of the source archive
(+PKG_MD5SUM+), the short one line description for the package (+PKG_DESCR+),
the package section for the menu configuration system (+PKG_SECTION+), the
package buildtime dependencies (+PKG_BUILDDEP+), the package runtime
dependencies (+PKG_DEPENDS+), the package homepage (+PKG_URL+) and finally the
internet locations at which the tarball can be downloaded from (+PKG_SITES+).
Normally ${PKG_NAME}-${PKG_VERSION}.tar.gz will be downloaded. You can
overwrite the default via the +DISTFILES+ variable. You can add more then one
archive name in +DISTFILES+ via space separated. If you have no source archive
at all, just use the boolean variable +NO_DISTFILES+ and set it to 1.

On line 17 the +mk/package.mk+ file is included, which contains the PKG_template
function, which is used in line 19.

On line 21-23 we install the shared library into the package installation
directory, which is used to create the resulting binary package or tar archive
for the target.

On line 25 we include +mk/pkg-bottom.mk+, which includes common functions used
by the package fetching and building process.

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 any particular step.
By adding a post-operation hook (after extract, patch, configure,
build or install). See xref:hooks[] for details.