forked from OSchip/llvm-project
93 lines
2.8 KiB
Makefile
93 lines
2.8 KiB
Makefile
# This file is intended to be included from each subdirectory makefile.
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#
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# Subdirectory makefiles must define:
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# SubDirs - The subdirectories to traverse.
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#
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# Subdirectory makefiles may define:
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# ModuleName - The library name for objects in that directory.
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# ObjNames - The objects available in that directory.
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# Implementation - The library configuration the objects should go in (Generic
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# or Optimized)
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# Dependencies - Any dependences for the object files.
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# OnlyArchs - Only build the objects for the listed archs.
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# OnlyConfigs - Only build the objects for the listed configurations.
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ifeq ($(Dir),)
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$(error "No Dir variable defined.")
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endif
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###
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# Include child makefile fragments
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# The list of variables which are intended to be overridden in a subdirectory
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# makefile.
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RequiredSubdirVariables := SubDirs
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OptionalSubdirVariables := ModuleName OnlyArchs OnlyConfigs \
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ObjNames Implementation Dependencies
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# Template: subdir_traverse_template subdir
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define subdir_traverse_template
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$(call Set,Dir,$(1))
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ifneq ($(DEBUGMAKE),)
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$$(info MAKE: $(Dir): Processing subdirectory)
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endif
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# Construct the variable key for this directory.
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$(call Set,DirKey,SubDir.$(subst .,,$(subst /,__,$(1))))
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$(call Append,SubDirKeys,$(DirKey))
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$(call Set,$(DirKey).Dir,$(Dir))
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# Reset subdirectory specific variables to sentinel value.
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$$(foreach var,$$(RequiredSubdirVariables) $$(OptionalSubdirVariables),\
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$$(call Set,$$(var),UNDEFINED))
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# Get the subdirectory variables.
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include $(1)/Makefile.mk
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ifeq ($(DEBUGMAKE),2)
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$$(foreach var,$(RequiredSubdirVariables) $(OptionalSubdirVariables),\
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$$(if $$(call strneq,UNDEFINED,$$($$(var))), \
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$$(info MAKE: $(Dir): $$(var) is defined), \
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$$(info MAKE: $(Dir): $$(var) is undefined)))
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endif
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# Check for undefined required variables, and unset sentinel value from optional
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# variables.
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$$(foreach var,$(RequiredSubdirVariables),\
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$$(if $$(call strneq,UNDEFINED,$$($$(var))),, \
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$$(error $(Dir): variable '$$(var)' was not undefined)))
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$$(foreach var,$(OptionalSubdirVariables),\
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$$(if $$(call strneq,UNDEFINED,$$($$(var))),, \
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$$(call Set,$$(var),)))
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# Collect all subdirectory variables for subsequent use.
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$$(foreach var,$(RequiredSubdirVariables) $(OptionalSubdirVariables),\
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$$(call Set,$(DirKey).$$(var),$$($$(var))))
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# Recurse.
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include make/subdir.mk
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# Restore directory variable, for cleanliness.
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$$(call Set,Dir,$(1))
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ifneq ($(DEBUGMAKE),)
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$$(info MAKE: $$(Dir): Done processing subdirectory)
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endif
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endef
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# Evaluate this now so we do not have to worry about order of evaluation.
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SubDirsList := $(strip \
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$(if $(call streq,.,$(Dir)),\
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$(SubDirs),\
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$(SubDirs:%=$(Dir)/%)))
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ifeq ($(SubDirsList),)
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else
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ifneq ($(DEBUGMAKE),)
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$(info MAKE: Descending into subdirs: $(SubDirsList))
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endif
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$(foreach subdir,$(SubDirsList),\
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$(eval $(call subdir_traverse_template,$(subdir))))
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endif
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