This file is included several times in a row, once

for each element of $(extra-libs). $(extra-libs-left)

is initialized first to $(extra-libs) so that with each

inclusion, we advance $(lib) to the next library name (e.g. libfoo).

The variable $($(lib)-routines) defines the list of modules

to be included in that library. A sysdep Makefile can add to

$(lib)-sysdep_routines to include additional modules.

Libraries listed in $(extra-libs-noinstall) are built, but not

installed.

lib := $(firstword $(extra-libs-left)) extra-libs-left := $(filter-out $(lib),$(extra-libs-left))

object-suffixes-$(lib) := $(filter-out $($(lib)-inhibit-o),$(object-suffixes))

ifneq (,$($(lib)-static-only-routines)) ifneq (,$(filter yes%,$(build-shared)$($(lib).so-version))) object-suffixes-$(lib) += $(filter-out $($(lib)-inhibit-o),.oS) endif endif

ifneq (,$(object-suffixes-$(lib)))

Make sure these are simply-expanded variables before we append to them,

since we want the expressions we append to be expanded right now.

install-lib := $(install-lib) extra-objs := $(extra-objs)

The modules that go in $(lib).

all-$(lib)-routines := $($(lib)-routines) $($(lib)-sysdep_routines)

Add each flavor of library to the lists of things to build and install.

ifeq (,$(filter $(lib), $(extra-libs-noinstall))) install-lib += $(foreach o,$(object-suffixes-$(lib)),$(lib:lib%=$(libtype$o))) endif extra-objs += $(foreach o,$(filter-out .os .oS,$(object-suffixes-$(lib))),\ $(patsubst %,%$o,$(filter-out \ $($(lib)-shared-only-routines),\ $(all-$(lib)-routines)))) ifneq (,$(filter .os,$(object-suffixes-$(lib)))) extra-objs += $(patsubst %,%.os,$(filter-out $($(lib)-static-only-routines),\ $(all-$(lib)-routines))) endif ifneq (,$(filter .oS,$(object-suffixes-$(lib)))) extra-objs += $(patsubst %,%.oS,$(filter $($(lib)-static-only-routines),\ $(all-$(lib)-routines))) endif alltypes-$(lib) := $(foreach o,$(object-suffixes-$(lib)),\ $(objpfx)$(patsubst %,$(libtype$o),\ $(lib:lib%=%)))

ifeq (,$(filter $(lib),$(extra-libs-others))) lib-noranlib: $(alltypes-$(lib)) ifeq (yes,$(build-shared)) lib-noranlib: $(objpfx)$(lib).so$($(lib).so-version) endif else others: $(alltypes-$(lib)) endif

The linked shared library is never a dependent of lib-noranlib,

because linking it will depend on libc.so already being built.

ifneq (,$(filter .os,$(object-suffixes-$(lib)))) others: $(objpfx)$(lib).so$($(lib).so-version) endif

Use o-iterator.mk to generate a rule for each flavor of library.

ifneq (,$(filter-out .os .oS,$(object-suffixes-$(lib)))) define o-iterator-doit $(objpfx)$(patsubst %,$(libtype$o),$(lib:lib%=%)): \ $(patsubst %,$(objpfx)%$o,\ $(filter-out $($(lib)-shared-only-routines),\ $(all-$(lib)-routines))); \ $$(build-extra-lib) endef object-suffixes-left = $(filter-out .os .oS,$(object-suffixes-$(lib))) include $(patsubst %,$(..)o-iterator.mk,$(object-suffixes-left)) endif

ifneq (,$(filter .os,$(object-suffixes-$(lib)))) $(objpfx)$(patsubst %,$(libtype.os),$(lib:lib%=%)): \ $(patsubst %,$(objpfx)%.os,\ $(filter-out $($(lib)-static-only-routines),\ $(all-$(lib)-routines))) $(build-extra-lib) endif

ifneq (,$(filter .oS,$(object-suffixes-$(lib)))) $(objpfx)$(patsubst %,$(libtype.oS),$(lib:lib%=%)): \ $(patsubst %,$(objpfx)%.oS,\ $(filter $($(lib)-static-only-routines),\ $(all-$(lib)-routines))) $(build-extra-lib) endif

ifeq ($(build-shared),yes)

Add the version script to the dependencies of the shared library.

$(objpfx)$(lib).so: $(firstword $($(lib)-map) \ $(addprefix $(common-objpfx), \ $(filter $(lib).map, \ $(version-maps)))) endif

endif

This will define `libof-ROUTINE := LIB' for each of the routines.

cpp-srcs-left := $($(lib)-routines) $($(lib)-sysdep_routines) ifneq (,$(cpp-srcs-left)) include $(patsubst %,$(..)libof-iterator.mk,$(cpp-srcs-left)) endif