32d2de2a6f
Recently a build failure was reported which was traced back to to the fact that the user had a TOOLCHAIN_VERSION environment variable set which leads to a strange looking error message: toolchain/toolchain/toolchain.mk:40: *** TOOLCHAIN_SITE cannot be empty when TOOLCHAIN_SOURCE is not. Stop. Environment variables automatically gets converted to make variables by GNU make - E.G. from the manual (https://www.gnu.org/software/make/manual/html_node/Environment.html): Variables in make can come from the environment in which make is run. Every environment variable that make sees when it starts up is transformed into a make variable with the same name and value So we end up in make with TOOLCHAIN_VERSION set to the value of the environment variable. As virtual packages do not have a version, there is no explicit TOOLCHAIN_VERSION = .. line in toolchain.mk overriding this value, and the logic in package/pkg-generic.mk sets a default value for TOOLCHAIN_SOURCE when TOOLCHAIN_VERSION is set, and finally errors out as TOOLCHAIN_SITE isn't set. As a workaround, explicitly set <pkg>_VERSION and <pkg>_SOURCE to the empty string in the virtual package infrastructure. Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
78 lines
3 KiB
Makefile
78 lines
3 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 a 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 $(1). Configuration error)
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endif
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endif
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# explicitly set these so we do not get confused by environment
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# variables with the same names.
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$(2)_VERSION =
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$(2)_SOURCE =
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$(2)_IS_VIRTUAL = YES
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# Add dependency against the provider
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# For a host package, there is no corresponding BR2_PACKAGE_PROVIDES_HOST_FOO,
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# so we need to compute it from the target variant.
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ifeq ($(4),target)
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$(2)_DEPENDENCIES += $$(call qstrip,$$(BR2_PACKAGE_PROVIDES_$(2)))
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else
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ifeq ($$(call qstrip,$$(BR2_PACKAGE_PROVIDES_$(2))),)
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# Inherit from target package BR2_PACKAGE_PROVIDES_FOO
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$(2)_DEPENDENCIES += host-$$(call qstrip,$$(BR2_PACKAGE_PROVIDES_$(3)))
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else
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# BR2_PACKAGE_PROVIDES_HOST_<pkg> is explicitly defined
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$(2)_DEPENDENCIES += $$(call qstrip,$$(BR2_PACKAGE_PROVIDES_$(2)))
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endif
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endif
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# Call the generic package infrastructure to generate the necessary
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# make targets
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$(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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