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[packages/trusty/cirros-testvm.git] / cirros-testvm / src-cirros / buildroot-2015.05 / package / pkg-virtual.mk

diff --git a/cirros-testvm/src-cirros/buildroot-2015.05/package/pkg-virtual.mk b/cirros-testvm/src-cirros/buildroot-2015.05/package/pkg-virtual.mk
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+++ b/cirros-testvm/src-cirros/buildroot-2015.05/package/pkg-virtual.mk
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+################################################################################
+# Virtual package infrastructure
+#
+# This file implements an infrastructure that eases development of
+# package .mk files for virtual packages. It should be used for all
+# virtual packages.
+#
+# See the Buildroot documentation for details on the usage of this
+# infrastructure
+#
+# In terms of implementation, this virtual infrastructure requires
+# the .mk file to only call the 'virtual-package' macro.
+#
+################################################################################
+
+
+################################################################################
+# inner-virtual-package -- defines the dependency rules of the virtual
+# package against its provider.
+#
+#  argument 1 is the lowercase package name
+#  argument 2 is the uppercase package name, including a HOST_ prefix
+#             for host packages
+#  argument 3 is the uppercase package name, without the HOST_ prefix
+#             for host packages
+#  argument 4 is the type (target or host)
+################################################################################
+
+# Note: putting this comment here rather than in the define block, otherwise
+# make would try to expand the $(error ...) in the comment, which is not
+# really what we want.
+# We need to use second-expansion for the $(error ...) call, below,
+# so it is not evaluated now, but as part of the generated make code.
+
+define inner-virtual-package
+
+# Ensure the virtual package has an implementation defined.
+ifeq ($$(BR2_PACKAGE_HAS_$(2)),y)
+ifeq ($$(call qstrip,$$(BR2_PACKAGE_PROVIDES_$(2))),)
+$$(error No implementation selected for virtual package $(1). Configuration error)
+endif
+endif
+
+# A virtual package does not have any source associated
+$(2)_SOURCE =
+
+# Fake a version string, so it looks nicer in the build log
+$(2)_VERSION = virtual
+
+# This must be repeated from inner-generic-package, otherwise we get an empty
+# _DEPENDENCIES
+ifeq ($(4),host)
+$(2)_DEPENDENCIES ?= $$(filter-out host-toolchain $(1),\
+       $$(patsubst host-host-%,host-%,$$(addprefix host-,$$($(3)_DEPENDENCIES))))
+endif
+
+# Add dependency against the provider
+$(2)_DEPENDENCIES += $$(call qstrip,$$(BR2_PACKAGE_PROVIDES_$(2)))
+
+# Call the generic package infrastructure to generate the necessary
+# make targets
+$(call inner-generic-package,$(1),$(2),$(3),$(4))
+
+endef
+
+################################################################################
+# virtual-package -- the target generator macro for virtual packages
+################################################################################
+
+virtual-package = $(call inner-virtual-package,$(pkgname),$(call UPPERCASE,$(pkgname)),$(call UPPERCASE,$(pkgname)),target)
+host-virtual-package = $(call inner-virtual-package,host-$(pkgname),$(call UPPERCASE,host-$(pkgname)),$(call UPPERCASE,$(pkgname)),host)