c293dd141c
There's a particular problem with lazy evaluation in case of BOOT_LANG: mkimage uses internal variable, BOOT_LANG = $(GLOBAL_BOOT_LANG) (note the lack of immediate assignment there), and if we set up export GLOBAL_BOOT_LANG = $(BOOT_LANG) in the same namespace we end up with recursively defined pair of variables; a ":=" in either place would save the day _but_ it's not there in m-p due to accumulator variables, e.g. USERS, which are defined and exported by a corresponding feature and then get populated *after* having been declared for export, _and_ it's not in mkimage as of 0.2.16 for some reason that might even be good (I don't know yet).
65 lines
2.0 KiB
Makefile
65 lines
2.0 KiB
Makefile
# NB: don"t use ANY quotes ('/") for put()/add()/set() arguments!
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# shell will get confused by ' or args get spammed with "
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# pay attention to the context functions get called in:
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# e.g. features.in/syslinux/config.mk introduces conditionals
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# this one adds whatever is given as an argument
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put = $(and $(1),$(put_body))
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define put_body
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{ $(log_body); \
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printf '%s\n' '$(1)' >> "$(CONFIG)"; }
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endef
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# these three take two args
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# add() just appends an additive rule...
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add = $(and $(1),$(2),$(add_body))
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define add_body
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$(if $(filter GLOBAL_% INFO_%,$(1)),$(warning add,$(1) might be a problem)) \
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{ $(log_body); \
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printf '%s += %s\n' '$(1)' '$(2)' >> "$(CONFIG)"; }
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endef
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# ...set() comments out any previous definition
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# and then appends an assigning rule...
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# NB: $(2) could be empty
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set = $(and $(1),$(set_body))
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define set_body
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{ $(log_body); \
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sed -i 's|^$(1)[ ]*[+?]*=.*$$|#& # overridden by $@|' "$(CONFIG)"; \
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printf '%s = %s\n' '$(1)' '$(2)' >> "$(CONFIG)"; }
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endef
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# try() appends a conditionally-assigning rule
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try = $(and $(1),$(2),$(try_body))
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define try_body
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{ $(log_body); \
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printf '%s ?= %s\n' '$(1)' '$(2)' >> "$(CONFIG)"; }
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endef
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# xport() requests a variable to be exported to the scripts
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# NB: immediate assignment would break accumulators like USERS
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xport = $(and $(1),$(xport_body))
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define xport_body
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{ $(log_body); \
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v='$(1:GLOBAL_%=%)'; \
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printf 'export GLOBAL_%s = $$(%s)\n' "$$v" "$$v" >> "$(CONFIG)"; }
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endef
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# if the rule being executed isn't logged yet, log it
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define log_body
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{ [ -s "$(CONFIG)" ] && \
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grep -q '^# $@$$' "$(CONFIG)" || printf '# %s\n' '$@' >> "$(CONFIG)"; }
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endef
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# in a use/feature/particularly target, we need a "feature" bit
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add_feature = $(call add,FEATURES,$(word 2,$(subst /, ,$@)))
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# convert tag list into a list of relative package list paths
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# NB: tags can do boolean expressions: (tag1 && !(tag2 || tag3))
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tags = $(and $(strip $(1)),$(addprefix tagged/,$(shell echo "$(1)" \
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| tags2lists pkg.in/lists/tagged)))
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# toplevel Makefile convenience
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addsuffices = $(foreach s,$(1),$(call addsuffix,$s,$(2)))
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