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subdir.mk
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# Input
#
# subdirs tells the subdirectories to descend
#
# Output
#
# set srcs gen-srcs
# set cflags-$(oname) cflags-remove-$(oname)
# cxxflags-$(oname) cxxflags-remove-$(oname)
# aflags-$(oname) aflags-remove-$(oname)
# cppflags-$(oname) cppflags-remove-$(oname)
# incdirs-$(oname)
# incdirs-lib$(libname)-$(sm) [if libname is defined]
# cppflags-lib$(libname)-$(sm) [if libname is defined]
# cflags-lib$(libname)-$(sm) [if libname is defined]
# cxxflags-lib$(libname)-$(sm) [if libname is defined]
# for each file found, oname is the name of the object file for corresponding
# source file
srcs :=
gen-srcs :=
asm-defines-files :=
define process-subdir-srcs-y
ifeq ($$(sub-dir),.)
srcs += $1
oname := $(out-dir)/$(base-prefix)$(basename $1).o
else
ifneq ($(filter /%,$(1)),)
# $1 is an absolute path - start with "/"
srcs += $1
oname := $(out-dir)/$(base-prefix)$(basename $1).o
else
srcs += $(sub-dir)/$1
oname := $(out-dir)/$(base-prefix)$(basename $$(sub-dir)/$1).o
endif
endif
cflags-$$(oname) := $$(cflags-y) $$(cflags-$(1)-y)
cflags-remove-$$(oname) := $$(cflags-remove-y) \
$$(cflags-remove-$(1)-y)
cxxflags-$$(oname) := $$(cxxflags-y) $$(cxxflags-$(1)-y)
cxxflags-remove-$$(oname) := $$(cxxflags-remove-y) \
$$(cxxflags-remove-$(1)-y)
cppflags-$$(oname) := $$(cppflags-y) $$(cppflags-$(1)-y)
cppflags-remove-$$(oname) := $$(cppflags-remove-y) \
$$(cppflags-remove-$(1)-y)
aflags-$$(oname) := $$(aflags-y) $$(aflags-$(1)-y)
aflags-remove-$$(oname) := $$(aflags-remove-y) \
$$(aflags-remove-$(1)-y)
incdirs-$$(oname) := $$(thissubdir-incdirs) $$(addprefix $(sub-dir)/,$$(incdirs-$(1)-y))
# Clear local filename specific variables to avoid accidental reuse
# in another subdirectory
cflags-$(1)-y :=
cflags-remove-$(1)-y :=
cflags-lib-y :=
cxxflags-$(1)-y :=
cxxflags-remove-$(1)-y :=
cxxflags-lib-y :=
cppflags-$(1)-y :=
cppflags-remove-$(1)-y :=
cppflags-lib-y :=
aflags-$(1)-y :=
aflags-remove-$(1)-y :=
incdirs-$(1)-y :=
fname :=
oname :=
endef #process-subdir-srcs-y
define process-subdir-gensrcs-helper
# $1 gensrc-y element
# $2 full path and name of generated source file
# $3 full path and name of object file compiled from source file
# $4 full path to out directory
# $5 y if $2 must be generated before $(sm) starts building (e.g., .h file)
gen-srcs += $2
cleanfiles += $2
oname := $3
FORCE-GENSRC$(sm): $(if $(filter y,$5),$2,)
$$(addprefix $4,$$(produce-additional-$1)): $2
subdir-$2 := $$(sub-dir)
recipe-$2 := $$(recipe-$1)
$2: $$(depends-$1)
@$(cmd-echo-silent) ' GEN $2'
$(q)mkdir -p $4
$(q)$$(recipe-$2)
cflags-$$(oname) := $$(cflags-y) $$(cflags-$(1)-y)
cflags-remove-$$(oname) := $$(cflags-remove-y) \
$$(cflags-remove-$(1)-y)
cxxflags-$$(oname) := $$(cxxflags-y) $$(cxxflags-$(1)-y)
cxxflags-remove-$$(oname) := $$(cxxflags-remove-y) \
$$(cxxflags-remove-$(1)-y)
cppflags-$$(oname) := $$(cppflags-y) $$(cppflags-$(1)-y)
cppflags-remove-$$(oname) := $$(cppflags-remove-y) \
$$(cppflags-remove-$(1)-y)
aflags-$$(oname) := $$(aflags-y) $$(aflags-$(1)-y)
aflags-remove-$$(oname) := $$(aflags-remove-y) \
$$(aflags-remove-$(1)-y)
incdirs-$$(oname) := $$(thissubdir-incdirs) $$(addprefix $(sub-dir)/,$$(incdirs-$(1)-y))
# Clear local filename specific variables to avoid accidental reuse
# in another subdirectory
cflags-$(1)-y :=
cflags-remove-$(1)-y :=
cflags-lib-y :=
cxxflags-$(1)-y :=
cxxflags-remove-$(1)-y :=
cxxflags-lib-y :=
cppflags-$(1)-y :=
cppflags-remove-$(1)-y :=
cppflags-lib-y :=
aflags-$(1)-y :=
aflags-remove-$(1)-y :=
incdirs-$(1)-y :=
fname :=
oname :=
endef #process-subdir-gensrcs-helper
define process-subdir-gensrcs-y
$$(eval $$(call process-subdir-gensrcs-helper,$1,$(sub-dir-out)/$$(produce-$1),$(sub-dir-out)/$(basename $(produce-$1)).o,$(sub-dir-out),$(force-gensrc-$1)))
endef #process-subdir-gensrcs-y
define process-subdir-asm-defines-y
asm-defines-files += $(sub-dir)/$1
endef #process-subdir-asm-defines-y
define process-subdir
sub-dir := $1
ifeq ($1,.)
sub-dir-out := $(patsubst %/,%,$(out-dir)/$(base-prefix))
else
sub-dir-out := $(out-dir)/$(base-prefix)$1
endif
include $1/sub.mk
sub-subdirs := $$(addprefix $1/,$$(subdirs-y))
incdirs$(sm) := $(incdirs$(sm)) $$(addprefix $1/,$$(global-incdirs-y))
thissubdir-incdirs := $(out-dir)/$(base-prefix)$1 $$(addprefix $1/,$$(incdirs-y))
ifneq ($$(libname),)
incdirs-lib$$(libname)-$$(sm) := $$(incdirs-lib$$(libname)-$$(sm)) $$(addprefix $1/,$$(incdirs-lib-y))
cflags-lib$$(libname)-$$(sm) := $$(cflags-lib$$(libname)-$$(sm)) $$(cflags-lib-y)
cxxflags-lib$$(libname)-$$(sm) := $$(cxxflags-lib$$(libname)-$$(sm)) $$(cxxflags-lib-y)
cppflags-lib$$(libname)-$$(sm) := $$(cppflags-lib$$(libname)-$$(sm)) $$(cppflags-lib-y)
endif
# Process files in current directory
$$(foreach g, $$(gensrcs-y), $$(eval $$(call process-subdir-gensrcs-y,$$(g))))
$$(foreach s, $$(srcs-y), $$(eval $$(call process-subdir-srcs-y,$$(s))))
$$(foreach a, $$(asm-defines-y), $$(eval $$(call process-subdir-asm-defines-y,$$(a))))
# Clear flags used when processing current directory
srcs-y :=
cflags-y :=
cflags-lib-y :=
cxxflags-y :=
cxxflags-lib-y :=
cppflags-y :=
cppflags-lib-y :=
aflags-y :=
cflags-remove-y :=
cxxflags-remove-y :=
aflags-remove-y :=
subdirs-y :=
global-incdirs-y :=
incdirs-lib-y :=
incdirs-y :=
gensrcs-y :=
this-out-dir :=
asm-defines-y :=
# Process subdirectories in current directory
$$(foreach sd, $$(sub-subdirs), $$(eval $$(call process-subdir,$$(sd))))
endef #process-subdir
# Top subdirectories
$(foreach sd, $(subdirs), $(eval $(call process-subdir,$(sd))))