// -*- mode:doc; -*-
// vim: set syntax=asciidoc:
-=== Integration of Meson-based packages
+=== Infrastructure for Meson-based packages
[[meson-package-tutorial]]
==== +meson-package+ tutorial
http://mesonbuild.com[Meson] is an open source build system meant to be both
-extremely fast, and, even more importantly, as user friendly as possible.
+extremely fast, and, even more importantly, as user friendly as possible. It
+uses https://ninja-build.org[Ninja] as a companion tool to perform the actual
+build operations.
-Buildroot does not (yet) provide a dedicated package infrastructure for
-meson-based packages. So, we will explain how to write a +.mk+ file for such a
-package. Let's start with an example:
+Let's see how to write a +.mk+ file for a Meson-based package, with an example:
------------------------------
01: ################################################################################
11: FOO_LICENSE_FILES = COPYING
12: FOO_INSTALL_STAGING = YES
13:
-14: FOO_DEPENDENCIES = host-meson host-pkgconf bar
+14: FOO_DEPENDENCIES = host-pkgconf bar
15:
-16: FOO_CONF_OPTS += \
-17: --prefix=/usr \
-18: --buildtype $(if $(BR2_ENABLE_DEBUG),debug,release) \
-19: --cross-file $(HOST_DIR)/etc/meson/cross-compilation.conf
-20:
-21: FOO_NINJA_OPTS = $(if $(VERBOSE),-v) -j$(PARALLEL_JOBS)
+16: ifeq ($(BR2_PACKAGE_BAZ),y)
+17: FOO_CONF_OPTS += -Dbaz=true
+18: FOO_DEPENDENCIES += baz
+19: else
+20: FOO_CONF_OPTS += -Dbaz=false
+21: endif
22:
-23: ifeq ($(BR2_PACKAGE_BAZ),y)
-24: FOO_CONF_OPTS += -Dbaz
-25: endif
-26:
-27: define FOO_CONFIGURE_CMDS
-28: rm -rf $(@D)/build
-29: mkdir -p $(@D)/build
-30: $(TARGET_MAKE_ENV) meson $(FOO_CONF_OPTS) $(@D) $(@D)/build
-31: endef
-32:
-33: define FOO_BUILD_CMDS
-34: $(TARGET_MAKE_ENV) ninja $(FOO_NINJA_OPTS) -C $(@D)/build
-35: endef
-36:
-37: define FOO_INSTALL_TARGET_CMDS
-38: $(TARGET_MAKE_ENV) DESTDIR=$(TARGET_DIR) ninja $(FOO_NINJA_OPTS) \
-39: -C $(@D)/build install
-40: endef
-41:
-42: define FOO_INSTALL_STAGING_CMDS
-43: $(TARGET_MAKE_ENV) DESTDIR=$(STAGING_DIR) ninja $(FOO_NINJA_OPTS) \
-44: -C $(@D)/build install
-45: endef
-46:
-47: $(eval $(generic-package))
+23: $(eval $(meson-package))
--------------------------------
The Makefile starts with the definition of the standard variables for package
declaration (lines 7 to 11).
-As seen in line 47, it is based on the
-xref:generic-package-tutorial[+generic-package+ infrastructure]. So, it defines
-the variables required by this particular infrastructure, where Meson and its
-companion tool, Ninja, are invoked:
+On line line 23, we invoke the +meson-package+ macro that generates all the
+Makefile rules that actually allows the package to be built.
-* +FOO_CONFIGURE_CMDS+: the build directory required by Meson is created, and
- Meson is invoked to generate the Ninja build file. The options required to
- configure the cross-compilation of the package are passed via
- +FOO_CONF_OPTS+.
+In the example, +host-pkgconf+ and +bar+ are declared as dependencies in
++FOO_DEPENDENCIES+ at line 14 because the Meson build file of +foo+ uses
+`pkg-config` to determine the compilation flags and libraries of package +bar+.
-* +FOO_BUILD_CMDS+: Ninja is invoked to perform the build.
+Note that it is not necessary to add +host-meson+ in the +FOO_DEPENDENCIES+
+variable of a package, since this basic dependency is automatically added as
+needed by the Meson package infrastructure.
-* +FOO_INSTALL_TARGET_CMDS+: Ninja is invoked to install the files generated
- during the build step in the target directory.
-
-* +FOO_INSTALL_STAGING_CMDS+: Ninja is invoked to install the files generated
- during the build step in the staging directory, as +FOO_INSTALL_STAGING+ is
- set to "YES".
-
-In order to have Meson available for the build, +FOO_DEPENDENCIES+ needs to
-contain +host-meson+. In the example, +host-pkgconf+ and +bar+ are also
-declared as dependencies because the Meson build file of +foo+ uses `pkg-config`
-to determine the compilation flags and libraries of package +bar+.
-
-If the "baz" package is selected, then support for the "baz" feature in "foo"
-is activated by adding +-Dbaz+ to +FOO_CONF_OPTS+, as specified in the
-+meson_options.txt+ file in "foo" source tree.
+If the "baz" package is selected, then support for the "baz" feature in "foo" is
+activated by adding +-Dbaz=true+ to +FOO_CONF_OPTS+ at line 17, as specified in
+the +meson_options.txt+ file in "foo" source tree. The "baz" package is also
+added to +FOO_DEPENDENCIES+. Note that the support for +baz+ is explicitly
+disabled at line 20, if the package is not selected.
To sum it up, to add a new meson-based package, the Makefile example can be
copied verbatim then edited to replace all occurences of +FOO+ with the
uppercase name of the new package and update the values of the standard
variables.
+
+[[meson-package-reference]]
+
+==== +meson-package+ reference
+
+The main macro of the Meson package infrastructure is +meson-package+. It is
+similar to the +generic-package+ macro. The ability to have target and host
+packages is also available, with the +host-meson-package+ macro.
+
+Just like the generic infrastructure, the Meson infrastructure works by defining
+a number of variables before calling the +meson-package+ macro.
+
+First, all the package metadata information variables that exist in the generic
+infrastructure also exist in the Meson infrastructure: +FOO_VERSION+,
++FOO_SOURCE+, +FOO_PATCH+, +FOO_SITE+, +FOO_SUBDIR+, +FOO_DEPENDENCIES+,
++FOO_INSTALL_STAGING+, +FOO_INSTALL_TARGET+.
+
+A few additional variables, specific to the Meson infrastructure, can also be
+defined. Many of them are only useful in very specific cases, typical packages
+will therefore only use a few of them.
+
+* +FOO_CONF_ENV+, to specify additional environment variables to pass to
+ +meson+ for the configuration step. By default, empty.
+
+* +FOO_CONF_OPTS+, to specify additional options to pass to +meson+ for the
+ configuration step. By default, empty.
+
+* +FOO_NINJA_ENV+, to specify additional environment variables to pass to
+ +ninja+, meson companion tool in charge of the build operations. By default,
+ empty.
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