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437fd21ba0
Use _file_content function to retrieve port hash instead of 'echo | cat' construct that lead to 'Broken pipe' erros in GNU Make 4.4. issue #4725
72 lines
2.6 KiB
PHP
72 lines
2.6 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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# Utility to read content from a file if it exists and the given file name
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# is not empty.
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#
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_file_content = $(if $(wildcard $1),$(shell cat $1),)
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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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# 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 = $(call _file_content,$(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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#
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# We accumulate missing ports instead of stopping only if the environment
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# explicitely states that it is aware of it. This ensures that environments
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# that are not aware can't run into troubles with missing ports.
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#
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ifeq (ACCUMULATE_MISSING_PORTS,)
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_checked_port_dir = $(call _assert,$(call _port_dir,$1),$1 is not prepared or outdated)
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else
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_port_missing = $(eval DEP_MISSING_PORTS += $1)
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_checked_port = $(if $2,$2,$(call _port_missing,$1))
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_checked_port_dir = $(call _checked_port,$1,$(call _port_dir,$1))
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endif
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#
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# Search port within the 'CONTRIB_DIR' if defined, which is the case when
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# using the build system in the regular way. If the build system is invoked
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# by the package-build tool, however, all source codes are - by definition -
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# part of the package. In this case, 'CONTRIB_DIR' is undefined and we can
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# simply return the package's 'REP_DIR'.
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#
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ifneq ($(CONTRIB_DIR),)
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select_from_ports = $(call _checked_port_dir,$1)
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else
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select_from_ports = $(REP_DIR)
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endif
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