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The new 'select_from_ports' function allows a target description file to query the path to an installed port. All ports are stored in a central location specified as CONTRIB_DIR. By default, CONTRIB_DIR is defined as '<genode-dir>/contrib'. Ports of 3rd-party source code are managed using the tools at '<genode-dir>/tool/ports/'. Issue #1082
46 lines
1.8 KiB
PHP
46 lines
1.8 KiB
PHP
#
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# Utility for selecting files from the list of repositories
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#
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select_from_repositories = $(firstword $(foreach REP,$(REPOSITORIES),$(wildcard $(REP)/$(1))))
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#
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# Check presence of argument $1. Back out with error message $2 if not defined.
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#
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_assert = $(if $1,$1,$(error Error: $2))
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#
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# Append value $1 to variable named $2 and return value $1
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#
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# We must not specify an '=' here. Even though the make documentation states
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# that the omission of '=' should be equivalent to '=', the behaviour is not
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# the same.
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#
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define _capture
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$(eval $2 += $1)
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$1
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endef
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#
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# Lookup port directory by a given port name
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#
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# The location of the port directory is determined by the hash value stored
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# in the corresponding 'ports/<port>.hash' file. First we have to find the
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# hash file in one of the REPOSITORIES. Once we found the hash file, we use
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# its contained hash number to construct the path to the corresponding
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# subdirectory within CONTRIB_DIR. Finally, we check if the path exists.
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#
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# When reading the hash file in the '_hash_of_port' function, we feed stdin
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# to 'cat' to prevent 'cat' from blocking if the hash file is missing.
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#
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# As a side effect of calling 'select_from_ports' we log the used hash file
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# in the 'PORT_HASH_FILES' variable. This enables us incorporate the hash file
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# as dependency for all object files.
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#
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_lookup_port_hash_file = $(wildcard $(addsuffix /ports/$1.hash,$(REPOSITORIES)))
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_capture_port_hash_file = $(call _capture,$(call _lookup_port_hash_file,$1),PORT_HASH_FILES)
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_hash_of_port = $(shell echo | cat $(call _capture_port_hash_file,$1))
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_port_dir = $(wildcard $(CONTRIB_DIR)/$1-$(call _hash_of_port,$1))
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_checked_port_dir = $(call _assert,$(call _port_dir,$1),$1 is not prepared or outdated)
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select_from_ports = $(call _checked_port_dir,$1)
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