docs/manual: document the waf-package infra

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Romain Naour <romain.naour@openwide.fr>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
[Thomas: adjust to the changes in the infra, fix typos.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

docs/manual/adding-packages-waf.txt

@@ -0,0 +1,67 @@
+// -*- mode:doc; -*-
+// vim: set syntax=asciidoc:
+
+=== Infrastructure for Waf-based packages
+
+[[waf-package-tutorial]]
+
+==== +waf-package+ tutorial
+
+First, let's see how to write a +.mk+ file for a Waf-based package, with
+an example :
+
+------------------------
+01: ################################################################################
+02: #
+03: # libfoo
+04: #
+05: ################################################################################
+06:
+07: LIBFOO_VERSION = 1.0
+08: LIBFOO_SOURCE = libfoo-$(LIBFOO_VERSION).tar.gz
+09: LIBFOO_SITE = http://www.foosoftware.org/download
+10: LIBFOO_CONF_OPTS = --enable-bar --disable-baz
+11: LIBFOO_DEPENDENCIES = bar
+12:
+13: $(eval $(waf-package))
+------------------------
+
+On line 7, we declare the version of the package.
+
+On line 8 and 9, we declare the name of the tarball (xz-ed tarball
+recommended) and the location of the tarball on the Web. Buildroot
+will automatically download the tarball from this location.
+
+On line 10, we tell Buildroot what options to enable for libfoo.
+
+On line 11, we tell Buildroot the depednencies of libfoo.
+
+Finally, on line line 13, we invoke the +waf-package+
+macro that generates all the Makefile rules that actually allows the
+package to be built.
+
+[[waf-package-reference]]
+
+==== +waf-package+ reference
+
+The main macro of the Waf package infrastructure is +waf-package+.
+It is similar to the +generic-package+ macro.
+
+Just like the generic infrastructure, the Waf infrastructure works
+by defining a number of variables before calling the +waf-package+
+macro.
+
+First, all the package metadata information variables that exist in
+the generic infrastructure also exist in the Waf infrastructure:
++LIBFOO_VERSION+, +LIBFOO_SOURCE+, +LIBFOO_PATCH+, +LIBFOO_SITE+,
++LIBFOO_SUBDIR+, +LIBFOO_DEPENDENCIES+, +LIBFOO_INSTALL_STAGING+,
++LIBFOO_INSTALL_TARGET+.
+
+An additional variable, specific to the Waf infrastructure, can
+also be defined.
+
+* +LIBFOO_NEEDS_EXTERNAL_WAF+ can be set to +YES+ or +NO+ to tell
+  Buildroot to use the bundled +waf+ executable. If set to +NO+, the
+  default, then Buildroot will use the waf executable provided in the
+  package source tree; if set to +YES+, then Buidlroot will download,
+  install waf as a host tool and use it to build the package.

docs/manual/adding-packages.txt

@@ -29,6 +29,8 @@ include::adding-packages-kconfig.txt[]
 
 include::adding-packages-rebar.txt[]
 
+include::adding-packages-waf.txt[]
+
 include::adding-packages-kernel-module.txt[]
 
 include::adding-packages-asciidoc.txt[]