455a354c96
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Thomas De Schampheleire <patrickdepinguin@gmail.com> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Reviewed-by: Samuel Martin <s.martin49@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
71 lines
2.8 KiB
Makefile
71 lines
2.8 KiB
Makefile
################################################################################
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# Virtual package infrastructure
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#
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# This file implements an infrastructure that eases development of
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# package .mk files for virtual packages. It should be used for all
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# virtual packages.
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#
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# See the Buildroot documentation for details on the usage of this
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# infrastructure
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#
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# In terms of implementation, this virtual infrastructure requires
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# the .mk file to only call the 'virtual-package' macro.
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#
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################################################################################
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################################################################################
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# inner-virtual-package -- defines the dependency rules of the virtual
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# package against its provider.
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#
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# argument 1 is the lowercase package name
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# argument 2 is the uppercase package name, including an HOST_ prefix
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# for host packages
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# argument 3 is the uppercase package name, without the HOST_ prefix
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# for host packages
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# argument 4 is the type (target or host)
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################################################################################
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# Note: putting this comment here rather than in the define block, otherwise
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# make would try to expand the $(error ...) in the comment, which is not
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# really what we want.
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# We need to use second-expansion for the $(error ...) call, below,
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# so it is not evaluated now, but as part of the generated make code.
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define inner-virtual-package
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# Ensure the virtual package has an implementation defined.
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ifeq ($(BR2_PACKAGE_HAS_$(2)),y)
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ifeq ($(call qstrip,$(BR2_PACKAGE_PROVIDES_$(2))),)
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$$(error No implementation selected for virtual package $(1). Configuration error)
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endif
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endif
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# A virtual package does not have any source associated
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$(2)_SOURCE =
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# Fake a version string, so it looks nicer in the build log
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$(3)_VERSION = virtual
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HOST_$(3)_VERSION = virtual
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# This must be repeated from inner-generic-package, otherwise we get an empty
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# _DEPENDENCIES
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$(2)_DEPENDENCIES ?= $(filter-out host-toolchain $(1),\
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$(patsubst host-host-%,host-%,$(addprefix host-,$($(3)_DEPENDENCIES))))
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# Add dependency against the provider
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$(2)_DEPENDENCIES += $(call qstrip,$(BR2_PACKAGE_PROVIDES_$(2)))
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# Call the generic package infrastructure to generate the necessary
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# make targets
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$(call inner-generic-package,$(1),$(2),$(3),$(4))
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endef
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################################################################################
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# virtual-package -- the target generator macro for virtual packages
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################################################################################
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virtual-package = $(call inner-virtual-package,$(pkgname),$(call UPPERCASE,$(pkgname)),$(call UPPERCASE,$(pkgname)),target)
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host-virtual-package = $(call inner-virtual-package,host-$(pkgname),$(call UPPERCASE,host-$(pkgname)),$(call UPPERCASE,$(pkgname)),host)
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