glibc/Makerules

# Copyright (C) 1991-2014 Free Software Foundation, Inc.
# This file is part of the GNU C Library.

# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.

# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <http://www.gnu.org/licenses/>.

#
#	Common rules for making the GNU C library.  This file is included
#	by the top-level Makefile and by all subdirectory makefiles
#	(through Rules).
#
ifneq (,)
This makefile requires GNU Make.
endif

REQUIRED_MAKE_VERSION = 3.74
REAL_MAKE_VERSION = $(firstword $(MAKE_VERSION))

ifneq ($(REQUIRED_MAKE_VERSION), \
       $(firstword $(sort $(REAL_MAKE_VERSION) $(REQUIRED_MAKE_VERSION))))
Wrong GNU Make version.  See above for the version needed.
endif


ifdef	subdir
..	:= ../
endif	# subdir

# If `sources' was defined by the parent makefile, undefine it so
# we will later get it from wildcard search in this directory.
ifneq	"$(findstring env,$(origin sources))" ""
sources :=
endif

oPATH := $(PATH)
PATH := this definition should take precedence over $(oPATH)
ifeq ($(PATH),$(oPATH))
You must not use the -e flag when building the GNU C library.
else
PATH := $(oPATH)
endif

ifndef +included-Makeconfig
include $(..)Makeconfig
endif

# This variable is used in ``include $(o-iterator)'' after defining
# $(o-iterator-doit) to produce some desired rule using $o for the object
# suffix, and setting $(object-suffixes-left) to $(object-suffixes); a copy
# is produced for each object suffix in use.
o-iterator = $(patsubst %,$(..)o-iterator.mk,$(object-suffixes-left))

# Include any system-specific makefiles.

# This is here so things in sysdep Makefiles can easily depend on foo.h as
# appropriate and not worry about where foo.h comes from, which may be
# system dependent and not known by that Makefile.
vpath %.h $(subst $(empty) ,:,$(strip $(common-objpfx) $(objpfx) \
				      $(+sysdep_dirs) $(..)))

# The same is true for RPC source files.
vpath %.x $(subst $(empty) ,:,$(strip $(common-objpfx) $(objpfx) \
				      $(+sysdep_dirs) $(..)))

# Some sysdep makefiles use this to distinguish being included here from
# being included individually by a subdir makefile (hurd/Makefile needs this).
in-Makerules := yes

sysdep-makefiles := $(wildcard $(sysdirs:=/Makefile))
ifneq (,$(sysdep-makefiles))
include $(sysdep-makefiles)
endif


# Reorder before-compile so that mach things come first, and hurd things
# second, before all else.  The mach and hurd subdirectories have many
# generated header files which the much of rest of the library depends on,
# so it is best to build them first (and mach before hurd, at that).
before-compile := $(filter $(common-objpfx)mach% $(common-objpfx)hurd%,\
			   $(before-compile)) \
		  $(filter-out $(common-objpfx)mach% $(common-objpfx)hurd%,\
			       $(before-compile))

# Even before that, we need abi-versions.h which is generated right here.
ifeq ($(build-shared),yes)
ifndef avoid-generated
before-compile := $(common-objpfx)abi-versions.h $(before-compile)
$(common-objpfx)abi-versions.h: $(..)scripts/abi-versions.awk \
				$(common-objpfx)Versions.all
	LC_ALL=C $(AWK) -v oldest_abi=$(oldest-abi) -f $^ > $@T
	mv -f $@T $@

$(common-objpfx)%.latest: $(common-objpfx)abi-versions.h
	sed -n '/ VERSION_$*_/{s/^.*_\([A-Z0-9_]*\).*$$/\1/;h;};$${g;p;}' \
	    $(common-objpfx)abi-versions.h > $@T
	mv -f $@T $@
endif # avoid-generated
endif # $(build-shared) = yes

ifndef avoid-generated
before-compile := $(common-objpfx)libc-abis.h $(before-compile)
$(common-objpfx)libc-abis.h: $(common-objpfx)libc-abis.stamp; @:
$(common-objpfx)libc-abis.stamp: $(..)scripts/gen-libc-abis \
			     $(firstword $(wildcard $(sysdirs:=/libc-abis)) \
					 $(..)libc-abis) \
			     $(..)Makerules
	$(SHELL) $< \
		 $(base-machine)-$(config-vendor)-$(config-os) \
		 < $(word 2,$^) > $(@:.stamp=.h)T
	$(move-if-change) $(@:.stamp=.h)T $(@:.stamp=.h)
	touch $@
common-generated += $(common-objpfx)libc-abis.h
endif # avoid-generated

# Make sure the subdirectory for object files gets created.
ifdef objpfx
ifeq (,$(wildcard $(objpfx).))
before-compile += $(objpfx).
$(objpfx).:
	$(make-target-directory)
endif
endif

# Remove existing files from `before-compile'.  Things are added there when
# they must exist for dependency generation to work right, but once they
# exist there is no further need for every single file to depend on them,
# and those gratuitous dependencies result in many gratuitous
# recompilations.
before-compile := $(filter-out $(wildcard $(before-compile)),$(before-compile))

# Don't let any before-compile file be an intermediate and get removed.
ifdef before-compile
$(before-compile):
endif

# We don't want $(common-objpfx) files to depend on miscellaneous stuff
# in subdirs.
ifdef subdir
common-before-compile := $(filter-out $(objpfx)%,$(before-compile))
else
common-before-compile = $(before-compile)
endif

ifndef subdir
# If a makefile needs to do something conditional on something that
# can only be figured out from headers, write a FOO.make.c input
# file that uses cpp contructs and contains @@@ LINE @@@ for each LINE
# to emit in the generated makefile, and use -include $(common-objpfx)FOO.make.
#
# We only generate these in the top-level makefile, to avoid any weirdness
# from subdir-specific makefile tweaks creeping in on an update.
$(common-objpfx)%.make: $(..)%.make.c $(..)Makerules $(common-before-compile)
	rm -f $@T $@.dT
	(echo '# Generated from $*.make.c by Makerules.'; \
	 $(CC) $(CFLAGS) $(CPPFLAGS) -E -DASSEMBLER $< \
	       -MD -MP -MT '$$(common-objpfx)$*.make' -MF $@.dT \
	 | sed -n '/@@@/{s/@@@[	 ]*\(.*\)@@@/\1/;s/[	 ]*$$//p;}'; \
	 echo 'common-generated += $(@F)'; \
	 sed $(sed-remove-objpfx) $(sed-remove-dotdot) $@.dT; \
	 rm -f $@.dT) > $@T
	mv -f $@T $@
endif

ifdef subdir
sed-remove-dotdot := -e 's@  *\.\.\/\([^ 	\]*\)@ $$(..)\1@g' \
		     -e 's@^\.\.\/\([^ 	\]*\)@$$(..)\1@g'
else
sed-remove-dotdot := -e 's@  *\([^ 	\/$$][^ 	\]*\)@ $$(..)\1@g' \
		     -e 's@^\([^ 	\/$$][^ 	\]*\)@$$(..)\1@g'
endif


ifdef gen-as-const-headers
# Generating headers for assembly constants.
# We need this defined early to get into before-compile before
# it's used in sysd-rules, below.
$(common-objpfx)%.h $(common-objpfx)%.h.d: $(..)scripts/gen-as-const.awk \
					   %.sym $(common-before-compile)
	$(AWK) -f $< $(filter %.sym,$^) \
	| $(CC) -S -o $(@:.h.d=.h)T3 $(CFLAGS) $(CPPFLAGS) -x c - \
		-MD -MP -MF $(@:.h=.h.d)T -MT '$(@:.h=.h.d) $(@:.h.d=.h)'
	sed -n 's/^.*@@@name@@@\([^@]*\)@@@value@@@[^0-9Xxa-fA-F-]*\([0-9Xxa-fA-F-][0-9Xxa-fA-F-]*\).*@@@end@@@.*$$/#define \1 \2/p' \
		$(@:.h.d=.h)T3 > $(@:.h.d=.h)T
	rm -f $(@:.h.d=.h)T3
	sed $(sed-remove-objpfx) $(sed-remove-dotdot) \
	    $(@:.h=.h.d)T > $(@:.h=.h.d)T2
	rm -f $(@:.h=.h.d)T
	mv -f $(@:.h=.h.d)T2 $(@:.h=.h.d)
	mv -f $(@:.h.d=.h)T $(@:.h.d=.h)
vpath %.sym $(sysdirs)
before-compile += $(gen-as-const-headers:%.sym=$(common-objpfx)%.h)

tests += $(gen-as-const-headers:%.sym=test-as-const-%)
generated += $(gen-as-const-headers:%.sym=test-as-const-%.c)
$(objpfx)test-as-const-%.c: $(..)scripts/gen-as-const.awk $(..)Makerules \
			    %.sym $(common-objpfx)%.h
	($(AWK) '{ sub(/^/, "asconst_", $$2); print; }' $(filter %.h,$^); \
	 $(AWK) -v test=1 -f $< $(filter %.sym,$^); \
	 echo '#include "$(..)test-skeleton.c"') > $@T
	mv -f $@T $@
endif

# Generate an ordered list of implicit rules which find the source files in
# each sysdep directory.  The old method was to use vpath to search all the
# sysdep directories.  However, that had the problem that a .S file in a
# later directory would be chosen over a .c file in an earlier directory,
# which does not preserve the desired sysdeps ordering behavior.

# System-dependent makefiles can put in `inhibit-sysdep-asm' regexps
# matching sysdep directories whose assembly source files should be
# suppressed.

-include $(common-objpfx)sysd-rules
ifneq ($(sysd-rules-sysdirs),$(config-sysdirs))
# The value of $(+sysdep_dirs) the sysd-rules was computed for
# differs from the one we are using now.  So force a rebuild of sysd-rules.
sysd-rules-force = FORCE
FORCE:
endif
$(common-objpfx)sysd-rules: $(..)scripts/sysd-rules.awk \
			    $(common-objpfx)config.make $(..)Makerules \
			    $(sysdep-makefiles) $(sysdep-makeconfigs) \
			    $(sysd-rules-force)
	-@rm -f $@T
	LC_ALL=C $(AWK) -f $< > $@T \
			-v all_object_suffixes='$(all-object-suffixes)' \
			-v inhibit_sysdep_asm='$(inhibit-sysdep-asm)' \
			-v sysd_rules_patterns='$(sysd-rules-patterns)' \
			-v config_sysdirs='$(config-sysdirs)'
	mv -f $@T $@

ifndef sysd-rules-done
# Don't do deps until this exists, because it provides rules to make the deps.
no_deps=t
endif

define o-iterator-doit
$(objpfx)%$o: %.S $(before-compile); $$(compile-command.S)
endef
object-suffixes-left := $(all-object-suffixes)
include $(o-iterator)

define o-iterator-doit
$(objpfx)%$o: %.c $(before-compile); $$(compile-command.c)
endef
object-suffixes-left := $(all-object-suffixes)
include $(o-iterator)

define o-iterator-doit
$(objpfx)%$o: %.cc $(before-compile); $$(compile-command.cc)
endef
object-suffixes-left := $(all-object-suffixes)
include $(o-iterator)

# Omit the objpfx rules when building in the source tree, because
# objpfx is empty and so these rules just override the ones above.
ifdef objpfx
# Define first rules to find the source files in $(objpfx).
# Generated source files will end up there.
define o-iterator-doit
$(objpfx)%$o: $(objpfx)%.S $(before-compile); $$(compile-command.S)
endef
object-suffixes-left := $(all-object-suffixes)
include $(o-iterator)

define o-iterator-doit
$(objpfx)%$o: $(objpfx)%.c $(before-compile); $$(compile-command.c)
endef
object-suffixes-left := $(all-object-suffixes)
include $(o-iterator)
endif

# Generate version maps, but wait until sysdep-subdirs is known
ifeq ($(sysd-sorted-done),t)
ifeq ($(build-shared),yes)
-include $(common-objpfx)sysd-versions
$(addprefix $(common-objpfx),$(version-maps)): $(common-objpfx)sysd-versions
common-generated += $(version-maps)
postclean-generated += sysd-versions Versions.all abi-versions.h \
		       Versions.def Versions.v.i Versions.v

ifndef avoid-generated
ifneq ($(sysd-versions-subdirs),$(sorted-subdirs) $(config-sysdirs))
sysd-versions-force = FORCE
FORCE:
endif

$(common-objpfx)Versions.def: $(..)scripts/versionlist.awk \
			      $(common-objpfx)Versions.v
	LC_ALL=C $(AWK) -f $^ > $@T
	mv -f $@T $@

$(common-objpfx)Versions.all: $(..)scripts/firstversions.awk \
			      $(common-objpfx)soversions.i \
			      $(common-objpfx)Versions.def
	{ while read which lib version setname; do \
	    test x"$$which" = xDEFAULT || continue; \
	    test -z "$$setname" || echo "$$lib : $$setname"; \
	  done < $(word 2,$^); \
	  cat $(word 3,$^); \
	} | LC_ALL=C $(AWK) -f $< > $@T
	mv -f $@T $@
# See %.v/%.v.i implicit rules in Makeconfig.
$(common-objpfx)Versions.v.i: $(wildcard $(subdirs:%=$(..)%/Versions)) \
			      $(wildcard $(sysdirs:%=%/Versions)) \
			      $(sysd-versions-force)
$(common-objpfx)sysd-versions: $(common-objpfx)Versions.all \
			       $(common-objpfx)Versions.v \
			       $(..)scripts/versions.awk
	( echo 'sysd-versions-subdirs = $(subdirs) $(config-sysdirs)' ; \
	  cat $(word 2,$^) \
	  | LC_ALL=C $(AWK) -v buildroot=$(common-objpfx) -v defsfile=$< \
			    -v move_if_change='$(move-if-change)' \
			    -f $(word 3,$^); \
	) > $@T
	mv -f $@T $@
endif # avoid-generated
endif # $(build-shared) = yes
endif # sysd-sorted-done

# Generate .dT files as we compile.
compile-mkdep-flags = -MD -MP -MF $@.dt -MT $@
compile-command.S = $(compile.S) $(OUTPUT_OPTION) $(compile-mkdep-flags)
compile-command.c = $(compile.c) $(OUTPUT_OPTION) $(compile-mkdep-flags)
compile-command.cc = $(compile.cc) $(OUTPUT_OPTION) $(compile-mkdep-flags)

# Like compile-mkdep-flags, but for use with $(BUILD_CC).  We don't want to
# track system includes here, they may spuriously trigger an install rule,
# and would cause the check-local-headers test to fail.
native-compile-mkdep-flags = -MMD -MP -MF $@.dt -MT $@

# GCC can grok options after the file name, and it looks nicer that way.
compile.c = $(CC) $< -c $(CFLAGS) $(CPPFLAGS)
compile.cc = $(CXX) $< -c $(CXXFLAGS) $(CPPFLAGS)
compile.S = $(CC) $< -c $(CPPFLAGS) $(S-CPPFLAGS) \
		  $(ASFLAGS) $(ASFLAGS-$(suffix $@))
COMPILE.c = $(CC) -c $(CFLAGS) $(CPPFLAGS)
COMPILE.S = $(CC) -c $(CPPFLAGS) $(S-CPPFLAGS) \
		  $(ASFLAGS) $(ASFLAGS-$(suffix $@))

# We need this for the output to go in the right place.  It will default to
# empty if make was configured to work with a cc that can't grok -c and -o
# together.  You can't compile the C library with such a compiler.
OUTPUT_OPTION = -o $@

# This is the end of the pipeline for compiling generated C code.
compile-stdin.c = $(COMPILE.c) -o $@ -x c - $(compile-mkdep-flags)

# We need the $(CFLAGS) to be in there to have the right predefines during
# the dependency run for C sources.  But having it for assembly sources can
# get the wrong predefines.
S-CPPFLAGS = -DASSEMBLER $(asm-CPPFLAGS)

define +make-deps
$(make-target-directory)
$(+mkdep) $< $(if $(filter %.c,$<),$(CFLAGS)) \
	     $(CPPFLAGS) $($(patsubst .%,%,$(suffix $(<F)))-CPPFLAGS) | sed -e\
's,$(subst .,\.,$(@F:.d=.o)),$(foreach o,$(all-object-suffixes),$(@:.d=$o)) $@,' \
$(sed-remove-objpfx) $(sed-remove-dotdot) > $(@:.d=.T)
mv -f $(@:.d=.T) $@ $(generate-md5)
endef

ifneq (,$(objpfx))
# Continuation lines here are dangerous because they introduce spaces!
define sed-remove-objpfx
-e 's@ $(subst .,\.,$(subst @,\@,$(common-objpfx)))@ $$(common-objpfx)@g' \
-e 's@^$(subst .,\.,$(subst @,\@,$(common-objpfx)))@$$(common-objpfx)@g'
endef
endif

# Modify the list of routines we build for different targets

ifeq (yes,$(build-shared))
ifndef libc.so-version
# Undefine this because it can't work when we libc.so is unversioned.
static-only-routines =
endif
endif

elide-routines.oS += $(filter-out $(static-only-routines),\
				  $(routines) $(aux) $(sysdep_routines))
elide-routines.os += $(static-only-routines)

# If we have versioned code we don't need the old versions in any of the
# static libraries.
elide-routines.o  += $(shared-only-routines)
elide-routines.op += $(shared-only-routines)
elide-routines.og += $(shared-only-routines)

# Shared library building.

ifeq (yes,$(build-shared))

# Reference map file only when shared libraries are built and a map file name
# is given.
ifeq ($(build-shared),yes)
map-file = $(firstword $($(@F:.so=-map)) \
		       $(addprefix $(common-objpfx), \
				   $(filter $(@F:.so=.map),$(version-maps))))
load-map-file = $(map-file:%=-Wl,--version-script=%)
endif

# Compiler arguments to use to link a shared object with libc and
# ld.so.  This is intended to be as similar as possible to a default
# link with an installed libc.
link-libc-args = -Wl,--start-group \
		 $(libc-for-link) \
		 $(common-objpfx)libc_nonshared.a \
		 $(as-needed) $(elfobjdir)/ld.so $(no-as-needed) \
		 -Wl,--end-group

# The corresponding shared libc to use.  This may be modified for a
# particular target.
libc-for-link = $(common-objpfx)libc.so

# The corresponding dependencies.  As these are used in dependencies,
# not just commands, they cannot use target-specific variables so need
# to name both possible libc.so objects.
link-libc-deps = $(common-objpfx)libc.so $(common-objpfx)linkobj/libc.so \
		 $(common-objpfx)libc_nonshared.a $(elfobjdir)/ld.so

# Pattern rule to build a shared object from an archive of PIC objects.
# This must come after the installation rules so Make doesn't try to
# build shared libraries in place from the installed *_pic.a files.
# $(LDLIBS-%.so) may contain -l switches to generate run-time dependencies
# on other shared objects.  The linking with libc and ld.so is intended
# to be as similar as possible to a default link with an installed libc.
lib%.so: lib%_pic.a $(+preinit) $(+postinit) $(+interp) $(link-libc-deps)
	$(build-shlib) $(link-libc-args)

define build-shlib-helper
$(LINK.o) -shared $(static-libgcc) -Wl,-O1 $(sysdep-LDFLAGS) \
	  $(if $($(@F)-no-z-defs)$(no-z-defs),,-Wl,-z,defs) $(rtld-LDFLAGS) \
	  $(extra-B-$(@F:lib%.so=%).so) -B$(csu-objpfx) \
	  $(extra-B-$(@F:lib%.so=%).so) $(load-map-file) \
	  -Wl,-soname=lib$(libprefix)$(@F:lib%.so=%).so$($(@F)-version) \
	  $(LDFLAGS.so) $(LDFLAGS-$(@F:lib%.so=%).so) \
	  -L$(subst :, -L,$(rpath-link)) -Wl,-rpath-link=$(rpath-link)
endef

ifeq (yes,$(use-default-link))
# If the linker is good enough, we can let it use its default linker script.
shlib-lds =
shlib-lds-flags =
else
# binutils only position loadable notes into the first page for binaries,
# not for shared objects
$(common-objpfx)shlib.lds: $(common-objpfx)config.make $(..)Makerules
	$(LINK.o) -shared -Wl,-O1 \
		  -nostdlib -nostartfiles \
		  $(sysdep-LDFLAGS) $(rtld-LDFLAGS) $(LDFLAGS.so) \
		  -Wl,--verbose 2>&1 | \
	  sed > $@T \
	      -e '/^=========/,/^=========/!d;/^=========/d' \
	      $(if $(filter yes,$(have-hash-style)), \
		   -e 's/^.*\.gnu\.hash[ 	]*:.*$$/  .note.ABI-tag : { *(.note.ABI-tag) } &/' \
		   -e '/^[ 	]*\.hash[ 	]*:.*$$/{h;d;}' \
		   -e '/DATA_SEGMENT_ALIGN/{H;g}' \
		, \
		   -e 's/^.*\.hash[ 	]*:.*$$/  .note.ABI-tag : { *(.note.ABI-tag) } &/' \
	       ) \
	      -e 's/^.*\*(\.dynbss).*$$/& \
		 PROVIDE(__start___libc_freeres_ptrs = .); \
		 *(__libc_freeres_ptrs) \
		 PROVIDE(__stop___libc_freeres_ptrs = .);/'\
	      -e 's@^.*\*(\.jcr).*$$@& \
		 PROVIDE(__start___libc_subfreeres = .);\
		 __libc_subfreeres : { *(__libc_subfreeres) }\
		 PROVIDE(__stop___libc_subfreeres = .);\
		 PROVIDE(__start___libc_atexit = .);\
		 __libc_atexit : { *(__libc_atexit) }\
		 PROVIDE(__stop___libc_atexit = .);\
		 PROVIDE(__start___libc_thread_subfreeres = .);\
		 __libc_thread_subfreeres : { *(__libc_thread_subfreeres) }\
		 PROVIDE(__stop___libc_thread_subfreeres = .);\
		 /DISCARD/ : { *(.gnu.glibc-stub.*) }@'
	test -s $@T
	mv -f $@T $@
common-generated += shlib.lds

shlib-lds = $(common-objpfx)shlib.lds
shlib-lds-flags = -T $(shlib-lds)
endif

define build-shlib
$(build-shlib-helper) -o $@ $(shlib-lds-flags) \
	  $(csu-objpfx)abi-note.o $(build-shlib-objlist)
endef

define build-module-helper
$(LINK.o) -shared $(static-libgcc) $(sysdep-LDFLAGS) $(rtld-LDFLAGS) \
	  $(if $($(@F)-no-z-defs)$(no-z-defs),,-Wl,-z,defs) \
	  -B$(csu-objpfx) $(load-map-file) \
	  $(LDFLAGS.so) $(LDFLAGS-$(@F:%.so=%).so) \
	  -L$(subst :, -L,$(rpath-link)) -Wl,-rpath-link=$(rpath-link)
endef

# This macro is similar to build-shlib but it does not define a soname
# and it does not depend on the destination name to start with `lib'.
# binutils only position loadable notes into the first page for binaries,
# not for shared objects
define build-module
$(build-module-helper) -o $@ $(shlib-lds-flags) \
	  $(csu-objpfx)abi-note.o $(build-module-objlist) $(link-libc-args)
endef
define build-module-asneeded
$(build-module-helper) -o $@ $(shlib-lds-flags) \
	  $(csu-objpfx)abi-note.o \
	  -Wl,--as-needed $(build-module-objlist) -Wl,--no-as-needed \
	  $(link-libc-args)
endef

build-module-helper-objlist = \
	$(patsubst %_pic.a,$(whole-archive) %_pic.a $(no-whole-archive),\
		   $(filter-out %.lds $(map-file) $(+preinit) $(+postinit) \
				$(link-libc-deps),$^))

build-module-objlist = $(build-module-helper-objlist) $(LDLIBS-$(@F:%.so=%).so)
build-shlib-objlist = $(build-module-helper-objlist) \
		      $(LDLIBS-$(@F:lib%.so=%).so)

# Don't try to use -lc when making libc.so itself.
# Also omits crti.o and crtn.o, which we do not want
# since we define our own `.init' section specially.
LDFLAGS-c.so = -nostdlib -nostartfiles
# But we still want to link libc.so against $(libc.so-gnulib).
LDLIBS-c.so += $(libc.so-gnulib)
# Give libc.so an entry point and make it directly runnable itself.
LDFLAGS-c.so += -e __libc_main
# If lazy relocation is disabled add the -z now flag.
ifeq ($(bind-now),yes)
LDFLAGS-c.so += -Wl,-z,now
endif
# Pre-link the objects of libc_pic.a so that we can locally resolve
# COMMON symbols before we link against ld.so.  This is because ld.so
# contains some of libc_pic.a already, which will prevent the COMMONs
# from being allocated in libc.so, which introduces evil dependencies
# between libc.so and ld.so, which can make it impossible to upgrade.
$(common-objpfx)libc_pic.os: $(common-objpfx)libc_pic.a
	$(LINK.o) -nostdlib -nostartfiles -r -o $@ \
	$(LDFLAGS-c_pic.os) -Wl,-d $(whole-archive) $^ -o $@

ifeq (,$(strip $(shlib-lds-flags)))
# Generate a list of -R options to excise .gnu.glibc-stub.* sections.
$(common-objpfx)libc_pic.opts: $(common-objpfx)libc_pic.os
	$(OBJDUMP) -h $< | \
	$(AWK) '$$2 ~ /\.gnu\.glibc-stub\./ { print "-R", $$2 }' \
		> $@T
	mv -f $@T $@
# Apply those -R options.
$(common-objpfx)libc_pic.os.clean: $(common-objpfx)libc_pic.opts \
				   $(common-objpfx)libc_pic.os
	$(OBJCOPY) @$^ $@
generated += libc_pic.opts libc_pic.os.clean

libc_pic_clean := .clean
endif

# Build a possibly-modified version of libc_pic.a for use in building
# linkobj/libc.so.
ifeq (,$(filter sunrpc,$(subdirs)))
$(common-objpfx)linkobj/libc_pic.a: $(common-objpfx)libc_pic.a
	$(make-target-directory)
	ln -f $< $@
else
$(common-objpfx)linkobj/libc_pic.a: $(common-objpfx)libc_pic.a \
				    $(common-objpfx)sunrpc/librpc_compat_pic.a
	$(make-target-directory)
	(cd $(common-objpfx)linkobj; \
	 $(AR) x ../libc_pic.a; \
	 rm $$($(AR) t ../sunrpc/librpc_compat_pic.a | sed 's/^compat-//'); \
	 $(AR) x ../sunrpc/librpc_compat_pic.a; \
	 $(AR) cr libc_pic.a *.os; \
	 rm *.os)
endif # $(subdirs) contains sunrpc

# Clear link-libc-deps for the libc.so libraries so build-shlibs does not
# filter ld.so out of the list of linked objects.
$(common-objpfx)libc.so: link-libc-deps = # empty
$(common-objpfx)linkobj/libc.so: link-libc-deps = # empty

# Use our own special initializer and finalizer files for the libc.so
# libraries.
$(common-objpfx)libc.so: $(elfobjdir)/soinit.os \
			 $(common-objpfx)libc_pic.os$(libc_pic_clean) \
			 $(elfobjdir)/sofini.os \
			 $(elfobjdir)/interp.os \
			 $(elfobjdir)/ld.so \
			 $(shlib-lds)
	$(build-shlib)

$(common-objpfx)linkobj/libc.so: $(elfobjdir)/soinit.os \
			 $(common-objpfx)linkobj/libc_pic.a \
			 $(elfobjdir)/sofini.os \
			 $(elfobjdir)/interp.os \
			 $(elfobjdir)/ld.so \
			 $(shlib-lds)
	$(build-shlib)

ifeq ($(build-shared),yes)
$(common-objpfx)libc.so: $(common-objpfx)libc.map
endif
common-generated += libc.so libc_pic.os
ifdef libc.so-version
$(common-objpfx)libc.so$(libc.so-version): $(common-objpfx)libc.so
	$(make-link)
common-generated += libc.so$(libc.so-version)
endif
endif

# Figure out the source filenames in this directory.

override sources := $(addsuffix .c,\
			$(filter-out $(elided-routines),\
			    $(routines) $(aux) \
			    $(sysdep_routines)))
sysdep_routines := $(sysdep_routines)

headers := $(headers) $(sysdep_headers)

# This is the list of all object files, gotten by
# replacing every ".c" in `sources' with a ".o".
override objects := $(addprefix $(objpfx),$(sources:.c=.o))


# The makefile may define $(extra-libs) with `libfoo libbar'
# to build libfoo.a et al from the modules listed in $(libfoo-routines).
ifdef extra-libs
# extra-lib.mk is included once for each extra lib to define rules
# to build it, and to add its objects to the various variables.
# During its evaluation, $(lib) is set to the name of the library.
extra-libs-left := $(extra-libs)
include $(patsubst %,$(..)extra-lib.mk,$(extra-libs))
endif


# The makefile may define $(modules-names) to build additional modules.
# These are built with $(build-module), except any in $(modules-names-nobuild).
ifdef modules-names
# extra-lib.mk is included once for each extra lib to define rules
# to build it, and to add its objects to the various variables.
# During its evaluation, $(lib) is set to the name of the library.
extra-modules-left := $(modules-names)
include $(patsubst %,$(..)extra-modules.mk,$(modules-names))

extra-modules-build := $(filter-out $(modules-names-nobuild),$(modules-names))
$(extra-modules-build:%=$(objpfx)%.so): $(objpfx)%.so: \
		$(objpfx)%.os $(shlib-lds) $(link-libs-deps)
	$(build-module)
endif

+depfiles := $(sources:.c=.d) \
	     $(patsubst %.o,%.d,$(filter %.o,$(extra-objs:.os=.o))) \
	     $(patsubst %.oS,%.d,$(filter %.oS,$(extra-objs))) \
	     $(patsubst %.o,%.d,$(filter %.o,$(extra-test-objs:.os=.o))) \
	     $(addsuffix .d,$(tests) $(xtests) $(test-srcs))
ifeq ($(build-programs),yes)
+depfiles += $(addsuffix .d,$(others) $(sysdep-others))
endif
+depfiles := $(addprefix $(objpfx),\
			 $(filter-out $(addsuffix .d,$(omit-deps)),\
				      $(+depfiles)))
all-dt-files := $(foreach o,$(object-suffixes-for-libc),$(+depfiles:.d=$o.dt))
+depfiles := $(patsubst %.dt,%.d,$(wildcard $(all-dt-files))) \
	     $(wildcard $(all-dt-files:.dt=.d))

# This is a funny rule in that it removes its input file.
%.d: %.dt
	@sed $(sed-remove-objpfx) $< > $(@:.d=.T) && \
	 mv -f $(@:.d=.T) $@ && \
	 rm -f $<

# Avoid the .h.d files for any .sym files whose .h files don't exist yet.
# They will be generated when they're needed, and trying too early won't work.
+gen-as-const := $(gen-as-const-headers:%.sym=$(common-objpfx)%.h)
+depfiles += $(addsuffix .d,$(filter $(wildcard $(+gen-as-const)),\
						$(+gen-as-const)))

ifdef +depfiles
ifneq ($(no_deps),t)
-include $(+depfiles)
endif
endif

# Maximize efficiency by minimizing the number of rules.
.SUFFIXES:	# Clear the suffix list.  We don't use suffix rules.
# Don't define any builtin rules.
MAKEFLAGS := $(MAKEFLAGS)r

# Generic rule for making directories.
%/:
# mkdir isn't smart enough to strip a trailing /.
# We always require a mkdir which supports the -p option to avoid error
# messages in case of races.
	mkdir -p $(@:%/=%)

# Make sure that object files are not removed
# when they are intermediates between sources and library members.
.PRECIOUS: $(addprefix $(objpfx)%,$(all-object-suffixes))

# Make sure that the parent library archive is never removed.
.PRECIOUS: $(foreach l,$(libtypes),$(patsubst %,$(common-objpfx)$l,c))

# Use the verbose option of ar and tar when not running silently.
ifeq	"$(findstring s,$(MAKEFLAGS))" ""	# if not -s
verbose := v
else	   					# -s
verbose	:=
endif						# not -s

ARFLAGS := r$(verbose)
CREATE_ARFLAGS := cru$(verbose)

# This makes all the object files in the parent library archive.

.PHONY: lib lib-noranlib
lib: lib-noranlib $(foreach l,$(libtypes),$(patsubst %,$(common-objpfx)$l,c))
lib-noranlib: libobjs

# For object-suffix $o, the list of objects with that suffix.
# Makefiles can define `elide-routines.so = foo' to leave foo.so out.
o-objects = $(patsubst %.o,%$o,$(filter-out $(patsubst %,$(objpfx)%.o,\
						       $(elide-routines$o)),\
					    $(objects))) \
	    $(addprefix $(objpfx),$(o-objects$o))

others: $(addprefix $(objpfx),$(install-lib))

ifndef objects

# Create the stamp$o files to keep the parent makefile happy.
subdir_lib: $(foreach o,$(object-suffixes-for-libc),$(objpfx)stamp$o)
$(foreach o,$(object-suffixes-for-libc),$(objpfx)stamp$o):
	$(make-target-directory)
	rm -f $@; > $@
else

# Define explicit rules to update each $(objpfx)stamp.SUFFIX
# timestamp file; these rules (one explicit rule is generated for each
# object suffix) write a list of objects to update in the stamp file.
# The parent will then actually add them all to the archive in the
# archive rule, below.
define o-iterator-doit
$(objpfx)stamp$o: $(o-objects); $$(do-stamp)
endef
define do-stamp
$(make-target-directory)
echo '$(patsubst $(objpfx)%,$(addsuffix /,$(subdir))%,$^)' > $@T
mv -f $@T $@
endef
object-suffixes-left := $(object-suffixes-for-libc)
include $(o-iterator)

endif

# Now define explicit rules to build the library archives; these depend
# on the stamp files built above.
define o-iterator-doit
$(common-objpfx)$(patsubst %,$(libtype$o),c): \
		$(subdirs-stamp-o) $(common-objpfx)stamp$o; $$(do-makelib)
endef
define do-makelib
cd $(common-objdir) && \
$(AR) $(CREATE_ARFLAGS) $(@F) `cat $(patsubst $(common-objpfx)%,%,$^)`
endef
subdirs-stamps := $(foreach d,$(subdirs),$(common-objpfx)$d/stamp%)
subdirs-stamp-o = $(subst %,$o,$(subdirs-stamps))
ifndef subdir
$(subdirs-stamps): subdir_lib;
endif
object-suffixes-left = $(object-suffixes-for-libc)
include $(o-iterator)


# This makes all the object files.
.PHONY: objects objs libobjs extra-objs
objects objs: libobjs extra-objs
libobjs: $(foreach o,$(object-suffixes-for-libc),$(objpfx)stamp$o)
extra-objs: $(addprefix $(objpfx),$(extra-objs))

# Canned sequence for building an extra library archive.
define build-extra-lib
$(patsubst %/,cd % &&,$(objpfx)) \
$(AR) $(CREATE_ARFLAGS) $(@:$(objpfx)%=%) \
      $(patsubst $(objpfx)%,%,$^)
endef

# Installation.

.PHONY: force-install
force-install:

# $(install-lib) are installed from the object directory into $(libdir);
# files in $(install-lib) matching `lib%.a' are ranlib'd after installation
# unless they also appear in $(non-lib.a).  $(install-data) are installed as
# they are into $(datadir).  $(headers) are installed as they are in
# $(includedir).  $(install-bin), $(install-bin-script) and $(install-sbin)
# are installed from the object directory into $(bindir), $(bindir) and
# $(sbindir), respectively.  $(install-others) and $(install-others-programs)
# are absolute path names of files to install; rules to install them are
# defined elsewhere.

# The simple library name to install libc.a under.
# This could be defined by a sysdep Makefile.
ifndef libc-name
libc-name := c
endif

define do-install
$(make-target-directory)
$(INSTALL_DATA) $< $@
endef

# Make the target directory if it doesn't exist, using the `mkinstalldirs'
# script that does `mkdir -p' even if `mkdir' doesn't support that flag.
define make-target-directory
$(addprefix $(..)./scripts/mkinstalldirs ,\
	    $(filter-out $(wildcard $(@D:%/=%)),$(@D:%/=%)))
endef

# Any directory (parent or subdir) should install libc.a; this way
# "make install" in a subdir is guaranteed to install everything it changes.
installed-libcs := $(foreach o,$(filter-out .os,$(object-suffixes-for-libc)),\
			     $(inst_libdir)/$(patsubst %,$(libtype$o),\
						     $(libprefix)$(libc-name)))
install: $(installed-libcs)
$(installed-libcs): $(inst_libdir)/lib$(libprefix)%: lib $(+force)
	$(make-target-directory)
	$(INSTALL_DATA) $(common-objpfx)lib$(*:$(libc-name)%=c%) $@

define do-install-program
$(make-target-directory)
$(INSTALL_PROGRAM) $< $@.new
mv -f $@.new $@
endef

define do-install-script
$(make-target-directory)
$(INSTALL_SCRIPT) $< $@.new
mv -f $@.new $@
endef

install-lib.so := $(filter %.so,$(install-lib:%_pic.a=%.so))
install-lib := $(filter-out %.so %_pic.a,$(install-lib))

ifeq (yes,$(build-shared))
# Find which .so's have versions.
versioned := $(strip $(foreach so,$(install-lib.so),\
			       $(patsubst %,$(so),$($(so)-version))))

install-lib.so-versioned := $(filter $(versioned), $(install-lib.so))
install-lib.so-unversioned := $(filter-out $(versioned), $(install-lib.so))

# For versioned libraries, we install three files:
#	$(inst_libdir)/libfoo.so	-- for linking, symlink or ld script
#	$(inst_slibdir)/libfoo.so.NN	-- for loading by SONAME, symlink
#	$(inst_slibdir)/libfoo-X.Y.Z.so -- the real shared object file
lib-version := $(firstword $($(subdir)-version) $(version))
install-lib-nosubdir: $(install-lib.so-unversioned:%=$(inst_slibdir)/%) \
		      $(foreach L,$(install-lib.so-versioned),\
				$(inst_libdir)/$L \
				$(inst_slibdir)/$(L:.so=)-$(lib-version).so \
				$(inst_slibdir)/$L$($L-version))

# Install all the unversioned shared libraries.
$(install-lib.so-unversioned:%=$(inst_slibdir)/%): $(inst_slibdir)/%.so: \
    $(objpfx)%.so $(+force)
	$(do-install-program)

ifneq ($(findstring -s,$(LN_S)),)
define make-link
rm -f $@.new
$(SHELL) $(..)scripts/rellns-sh $< $@.new
mv -f $@.new $@
endef
else
# If we have no symbolic links don't bother with rellns-sh.
define make-link
rm -f $@.new
$(LN_S) $< $@.new
mv -f $@.new $@
endef
endif

ifeq (yes,$(build-shared))
ifeq (no,$(cross-compiling))
symbolic-link-prog := $(common-objpfx)elf/sln
symbolic-link-list := $(common-objpfx)elf/symlink.list
define make-shlib-link
echo `$(..)scripts/rellns-sh -p $< $@` $@ >> $(symbolic-link-list)
endef
else # cross-compiling
# We need a definition that can be used by elf/Makefile's install rules.
symbolic-link-prog = $(LN_S)
endif
endif
ifndef make-shlib-link
define make-shlib-link
rm -f $@
$(LN_S) `$(..)scripts/rellns-sh -p $< $@` $@
endef
endif

ifdef libc.so-version
# For a library specified to be version N, install three files:
# libc.so	->	libc.so.N	(e.g. libc.so.6)
# libc.so.6	->	libc-VERSION.so	(e.g. libc-1.10.so)

$(inst_slibdir)/libc.so$(libc.so-version): $(inst_slibdir)/libc-$(version).so \
					   $(+force)
	$(make-shlib-link)
$(inst_slibdir)/libc-$(version).so: $(common-objpfx)libc.so $(+force)
	$(do-install-program)
install: $(inst_slibdir)/libc.so$(libc.so-version)

# This fragment of linker script gives the OUTPUT_FORMAT statement
# for the configuration we are building.  We put this statement into
# the linker scripts we install for -lc et al so that they will not be
# used by a link for a different format on a multi-architecture system.
$(common-objpfx)format.lds: $(..)scripts/output-format.sed \
			    $(common-objpfx)config.make \
			    $(common-objpfx)config.h $(..)Makerules
ifneq (unknown,$(output-format))
	echo > $@.new 'OUTPUT_FORMAT($(output-format))'
else
	$(LINK.o) -shared $(sysdep-LDFLAGS) $(rtld-LDFLAGS) $(LDFLAGS.so) \
		  -x c /dev/null -o $@.so -Wl,--verbose -v 2>&1 \
	| sed -n -f $< > $@.new
	test -s $@.new
	rm -f $@.so
endif
	mv -f $@.new $@
common-generated += format.lds

ifndef subdir
# What we install as libc.so for programs to link against is in fact a
# link script.  It contains references for the various libraries we need.
# The libc.so object is not complete since some functions are only defined
# in libc_nonshared.a.
# We need to use absolute paths since otherwise local copies (if they exist)
# of the files are taken by the linker.
install: $(inst_libdir)/libc.so
$(inst_libdir)/libc.so: $(common-objpfx)format.lds \
			$(common-objpfx)libc.so$(libc.so-version) \
			$(inst_libdir)/$(patsubst %,$(libtype.oS),\
						  $(libprefix)$(libc-name)) \
			$(+force)
	(echo '/* GNU ld script';\
	 echo '   Use the shared library, but some functions are only in';\
	 echo '   the static library, so try that secondarily.  */';\
	 cat $<; \
	 echo 'GROUP ( $(slibdir)/libc.so$(libc.so-version)' \
	      '$(libdir)/$(patsubst %,$(libtype.oS),$(libprefix)$(libc-name))'\
	      ' AS_NEEDED (' $(rtlddir)/$(rtld-installed-name) ') )' \
	) > $@.new
	mv -f $@.new $@

endif

else
install: $(inst_slibdir)/libc.so
$(inst_slibdir)/libc.so: $(common-objpfx)libc.so $(+force)
	$(do-install-program)
endif

ifneq (,$(versioned))
# Produce three sets of rules as above for all the smaller versioned libraries.

define o-iterator-doit
$(inst_libdir)/$o: $(inst_slibdir)/$o$($o-version) $(+force); $$(make-link)
endef
object-suffixes-left := $(filter-out $(install-lib-ldscripts),$(versioned))
ifneq (,$(object-suffixes-left))
include $(o-iterator)
endif

# Make symlinks in the build directory, because the versioned names might
# be referenced by a DT_NEEDED in another library.
define o-iterator-doit
$(objpfx)$o$($o-version): $(objpfx)$o; $$(make-link)
endef
object-suffixes-left := $(versioned)
include $(o-iterator)

generated += $(foreach o,$(versioned),$o$($o-version))

ifeq (,$($(subdir)-version))
define o-iterator-doit
$(inst_slibdir)/$o$($o-version): $(inst_slibdir)/$(o:.so=)-$(version).so \
				 $(+force);
	$$(make-shlib-link)
endef
object-suffixes-left := $(versioned)
include $(o-iterator)

define o-iterator-doit
$(inst_slibdir)/$(o:.so=)-$(version).so: $(objpfx)$o $(+force);
	$$(do-install-program)
endef
object-suffixes-left := $(versioned)
include $(o-iterator)
else
define o-iterator-doit
$(inst_slibdir)/$o$($o-version): \
  $(inst_slibdir)/$(o:.so=)-$($(subdir)-version).so $(+force);
	$$(make-shlib-link)
endef
object-suffixes-left := $(versioned)
include $(o-iterator)

define o-iterator-doit
$(inst_slibdir)/$(o:.so=)-$($(subdir)-version).so: $(objpfx)$o $(+force);
	$$(do-install-program)
endef
object-suffixes-left := $(versioned)
include $(o-iterator)
endif
endif

define do-install-so
$(do-install-program)
$(patsubst %,ln -s -f $(@F) $(@D)/$(patsubst %$*.so,%,$(<F))$(libprefix)$*.so,\
	   $(filter-out %.so,$@))
endef

so-versions := $(sort $(foreach so,$(install-lib.so),.so$($(so)-version)))
$(foreach v,$(so-versions),\
	  $(inst_slibdir)/lib$(libprefix)%$v): $(common-objpfx)lib%.so \
					       $(+force)
	$(do-install-so)
$(foreach v,$(so-versions),\
	  $(inst_slibdir)/$(libprefix)%$v): $(common-objpfx)%.so $(+force)
	$(do-install-so)
endif

ifdef install-bin
$(addprefix $(inst_bindir)/,$(install-bin)): \
    $(inst_bindir)/%: $(objpfx)% $(+force)
	$(do-install-program)
endif
ifdef install-bin-script
$(addprefix $(inst_bindir)/,$(install-bin-script)): \
    $(inst_bindir)/%: $(objpfx)% $(+force)
	$(do-install-script)
endif
ifdef install-rootsbin
$(addprefix $(inst_rootsbindir)/,$(install-rootsbin)): \
   $(inst_rootsbindir)/%: $(objpfx)% $(+force)
	$(do-install-program)
endif
ifdef install-sbin
$(addprefix $(inst_sbindir)/,$(install-sbin)): \
    $(inst_sbindir)/%: $(objpfx)% $(+force)
	$(do-install-program)
endif
ifdef install-lib
install-lib.a := $(filter lib%.a,$(install-lib))
install-lib-non.a := $(filter-out lib%.a,$(install-lib))
ifdef install-lib-non.a
$(addprefix $(inst_libdir)/$(libprefix),$(install-lib-non.a)): \
  $(inst_libdir)/$(libprefix)%: $(objpfx)% $(+force)
	$(do-install)
endif
ifdef install-lib.a
$(install-lib.a:lib%.a=$(inst_libdir)/lib$(libprefix)%.a): \
  $(inst_libdir)/lib$(libprefix)%.a: $(objpfx)lib%.a $(+force)
	$(do-install)
endif
endif
ifdef install-data
$(addprefix $(inst_datadir)/,$(install-data)): $(inst_datadir)/%: % $(+force)
	$(do-install)
endif
headers := $(strip $(headers))
ifdef headers
# This implicit rule installs headers from the source directory.
# It may be ignored in preference to rules from sysd-rules to find
# headers in the sysdeps tree.
$(inst_includedir)/%.h: $(objpfx)%.h $(+force)
	$(do-install)
$(inst_includedir)/%.h: $(common-objpfx)%.h $(+force)
	$(do-install)
$(inst_includedir)/%.h: %.h $(+force)
	$(do-install)
$(inst_includedir)/%.h: $(..)include/%.h $(+force)
	$(do-install)
headers-nonh := $(filter-out %.h,$(headers))
ifdef headers-nonh
$(addprefix $(inst_includedir)/,$(headers-nonh)): $(inst_includedir)/%: \
						 % $(+force)
	$(do-install)
endif	# headers-nonh
endif	# headers

.PHONY: install-bin-nosubdir install-bin-script-nosubdir \
	install-rootsbin-nosubdir install-sbin-nosubdir install-lib-nosubdir \
	install-data-nosubdir install-headers-nosubdir
install-bin-nosubdir: $(addprefix $(inst_bindir)/,$(install-bin))
install-bin-script-nosubdir: $(addprefix $(inst_bindir)/,$(install-bin-script))
install-rootsbin-nosubdir: \
	$(addprefix $(inst_rootsbindir)/,$(install-rootsbin))
install-sbin-nosubdir: $(addprefix $(inst_sbindir)/,$(install-sbin))
install-lib-nosubdir: $(addprefix $(inst_libdir)/,\
		       $(patsubst lib%.a,lib$(libprefix)%.a,$(install-lib.a)) \
		       $(addprefix $(libprefix),$(install-lib-non.a)))
install-data-nosubdir: $(addprefix $(inst_datadir)/,$(install-data))
install-headers-nosubdir: $(addprefix $(inst_includedir)/,$(headers))
install-others-nosubdir: $(install-others)
install-others-programs-nosubdir: $(install-others-programs)

# We need all the `-nosubdir' targets so that `install' in the parent
# doesn't depend on several things which each iterate over the subdirs.
# This rule makes `install-FOO' always use `install-FOO-nosubdir' as a
# subroutine.  Then in the parent `install-FOO' also causes subdir makes.
install-%:: install-%-nosubdir ;

.PHONY: install install-no-libc.a-nosubdir
install-no-libc.a-nosubdir: install-headers-nosubdir install-data-nosubdir \
			    install-lib-nosubdir install-others-nosubdir
ifeq ($(build-programs),yes)
install-no-libc.a-nosubdir: install-bin-nosubdir install-bin-script-nosubdir \
			    install-rootsbin-nosubdir install-sbin-nosubdir \
			    install-others-programs-nosubdir
endif
install: install-no-libc.a-nosubdir

# Command to compile $< using the native libraries.
define native-compile
$(make-target-directory)
$(BUILD_CC) $($(basename $(<F))-CFLAGS) $(ALL_BUILD_CFLAGS) \
	    $< $(OUTPUT_OPTION) $(BUILD_LDFLAGS)
endef

# We always want to use configuration definitions.
ALL_BUILD_CFLAGS = $(BUILD_CFLAGS) $(BUILD_CPPFLAGS) -D_GNU_SOURCE \
		   -DIS_IN_build -include $(common-objpfx)config.h

# Support the GNU standard name for this target.
.PHONY: check
check: tests
# Special target to run tests which cannot be run unconditionally.
# Maintainers should use this target.
.PHONY: xcheck
xcheck: xtests

all-nonlib = $(strip $(tests) $(xtests) $(test-srcs) $(test-extras) $(others))
ifneq (,$(all-nonlib))
cpp-srcs-left = $(all-nonlib:=.c) $(all-nonlib:=.cc)
lib := nonlib
include $(patsubst %,$(..)cppflags-iterator.mk,$(cpp-srcs-left))
endif

# The include magic above causes those files to use this variable for flags.
CPPFLAGS-nonlib = -DNOT_IN_libc=1


ifeq ($(build-shared),yes)
# Generate normalized lists of symbols, versions, and data sizes.
# This is handy for checking against existing library binaries.

%.symlist: $(..)scripts/abilist.awk %.dynsym
	LC_ALL=C $(AWK) -f $^ > $@T
	mv -f $@T $@

%.dynsym: %.so
	LC_ALL=C $(OBJDUMP) --dynamic-syms $< > $@T
	mv -f $@T $@

# A sysdeps/.../Makefile can set abilist-pattern to something like
# %-foo.abilist to look for libc-foo.abilist instead of libc.abilist.
# This makes sense if multiple ABIs can be most cleanly supported by a
# configuration without using separate sysdeps directories for each.
ifdef abilist-pattern
vpath $(abilist-pattern) $(+sysdep_dirs)
endif

vpath %.abilist $(+sysdep_dirs)

# The .PRECIOUS rule prevents the files built by an implicit rule whose
# target pattern is %.symlist from being considered "intermediate files"
# and automatically removed.  We only want these files to be removed by
# 'make clean', which is handled by the 'generated' variable.
.PRECIOUS: %.symlist
generated += $(extra-libs:=.symlist)

ifdef abilist-pattern
$(objpfx)check-abi-%.out: $(common-objpfx)config.make $(abilist-pattern) \
			  $(objpfx)%.symlist
	$(check-abi-pattern); \
	$(evaluate-test)
$(objpfx)check-abi-%.out: $(common-objpfx)config.make $(abilist-pattern) \
			  $(common-objpfx)%.symlist
	$(check-abi-pattern); \
	$(evaluate-test)
endif
$(objpfx)check-abi-%.out: $(common-objpfx)config.make %.abilist \
			  $(objpfx)%.symlist
	$(check-abi); \
	$(evaluate-test)
$(objpfx)check-abi-%.out: $(common-objpfx)config.make %.abilist \
			  $(common-objpfx)%.symlist
	$(check-abi); \
	$(evaluate-test)
define check-abi-pattern
	diff -p -U 0 $(filter $(abilist-pattern),$^) $(filter %.symlist,$^) \
	     > $@
endef
define check-abi
	diff -p -U 0 $(filter %.abilist,$^) $(filter %.symlist,$^) > $@
endef

ifdef abilist-pattern
update-abi-%: $(objpfx)%.symlist $(abilist-pattern)
	$(update-abi-pattern)
update-abi-%: $(common-objpfx)%.symlist $(abilist-pattern)
	$(update-abi-pattern)
endif
update-abi-%: $(objpfx)%.symlist %.abilist
	$(update-abi)
update-abi-%: $(common-objpfx)%.symlist %.abilist
	$(update-abi)
define update-abi-pattern
@if cmp -s $^ 2> /dev/null; \
 then \
      echo '+++ $(filter $(abilist-pattern),$^) is unchanged'; \
 else cp -f $^; \
      echo '*** Now check $(filter $(abilist-pattern),$^) changes for correctness ***'; \
 fi
endef
define update-abi
@if cmp -s $^ 2> /dev/null; \
 then \
      echo '+++ $(filter %.abilist,$^) is unchanged'; \
 else cp -f $^; \
      echo '*** Now check $(filter %.abilist,$^) changes for correctness ***'; \
 fi
endef

.PHONY: update-abi check-abi
update-abi: $(patsubst %.so,update-abi-%,$(install-lib.so-versioned))
check-abi-list = $(patsubst %.so,$(objpfx)check-abi-%.out, \
				 $(install-lib.so-versioned))
check-abi: $(check-abi-list)
ifdef subdir
subdir_check-abi: check-abi
subdir_update-abi: update-abi
else
check-abi: subdir_check-abi
	if grep -q '^FAIL:' $(objpfx)*/check-abi*.test-result; then exit 1; fi
update-abi: subdir_update-abi
endif

ifeq ($(subdir),elf)
check-abi: $(objpfx)check-abi-libc.out
tests-special += $(objpfx)check-abi-libc.out
update-abi: update-abi-libc
common-generated += libc.symlist
endif

ifeq ($(build-shared),yes)
ifdef subdir
tests-special += $(check-abi-list)
endif
endif

endif

# These will have been set by sysdeps/posix/Makefile.
L_tmpnam  ?= 1
TMP_MAX   ?= 0
L_ctermid ?= 1
L_cuserid ?= 1

stdio_lim = $(common-objpfx)bits/stdio_lim.h

$(stdio_lim:lim.h=%.h) $(stdio_lim:lim.h=%.d): $(stdio_lim:lim.h=%.st); @:
$(stdio_lim:h=st): $(..)stdio-common/stdio_lim.h.in $(..)Rules \
		   $(common-objpfx)config.make
	$(make-target-directory)
	{ echo '#include "$(..)posix/bits/posix1_lim.h"';		\
	  echo '#define _LIBC 1';					\
	  echo '#include "$(..)misc/sys/uio.h"'; } |			\
	$(CC) -E -dM -MD -MP -MF $(@:st=dT) -MT '$(@:st=h) $(@:st=d)' 	\
	      $(CPPUNDEFS) $(+includes) -xc - -o $(@:st=hT)
	sed $(sed-remove-objpfx) $(sed-remove-dotdot)			\
	    $(@:st=dT) > $(@:st=dt)
	mv -f $(@:st=dt) $(@:st=d)
	fopen_max=`sed -n 's/^#define OPEN_MAX //1p' $(@:st=hT)`; 	\
	filename_max=`sed -n 's/^#define PATH_MAX //1p' $(@:st=hT)`;	\
	iov_max=`sed -n 's/^#define UIO_MAXIOV //p' $(@:st=hT)`;	\
	fopen_max=$${fopen_max:-16};					\
	filename_max=$${filename_max:-1024};				\
	if [ -z "$$iov_max" ]; then					\
	  define_iov_max="# undef IOV_MAX";				\
	else								\
	  define_iov_max="# define IOV_MAX $$iov_max";			\
	fi;								\
	sed -e "s/@FOPEN_MAX@/$$fopen_max/"				\
	    -e "s/@FILENAME_MAX@/$$filename_max/"			\
	    -e "s/@L_tmpnam@/$(L_tmpnam)/"				\
	    -e "s/@TMP_MAX@/$(TMP_MAX)/"				\
	    -e "s/@L_ctermid@/$(L_ctermid)/"				\
	    -e "s/@L_cuserid@/$(L_cuserid)/"				\
	    -e "s/@define_IOV_MAX@/$$define_iov_max/"			\
	    $< > $(@:st=h.new)
	$(move-if-change) $(@:st=h.new) $(@:st=h)
# Remove these last so that they can be examined if something went wrong.
	rm -f $(@:st=hT) $(@:st=dT) $(@:st=dt)
	touch $@
# Get dependencies.
ifndef no_deps
-include $(stdio_lim:h=d)
endif
common-generated += bits/stdio_lim.h bits/stdio_lim.d bits/stdio_lim.st

FORCE:

.PHONY: echo-headers
echo-headers:
	@echo $(headers)

%.bz2: %; bzip2 -9vk $<
%.gz: %; gzip -9vnc $< > $@.new && mv -f $@.new $@
%.xz: %; xz -9evk $<

# Common cleaning targets.

.PHONY: common-mostlyclean common-clean mostlyclean clean do-tests-clean
clean: common-clean
mostlyclean: common-mostlyclean

do-tests-clean:
	-rm -f $(addprefix $(objpfx),$(addsuffix .out,$(tests) $(xtests) \
						      $(test-srcs)) \
				     $(addsuffix .test-result,$(tests) \
							      $(xtests) \
							      $(test-srcs)))

# Remove the object files.
common-mostlyclean:
	-rm -f $(addprefix $(objpfx),$(tests) $(xtests) $(test-srcs) \
				     $(others) $(sysdep-others) stubs \
				     $(addsuffix .o,$(tests) $(xtests) \
						    $(test-srcs) $(others) \
						    $(sysdep-others)) \
				     $(addsuffix .out,$(tests) $(xtests) \
						      $(test-srcs)) \
				     $(addsuffix .test-result,$(tests) \
							      $(xtests) \
							      $(test-srcs)))
	-rm -f $(addprefix $(objpfx),$(extra-objs) $(extra-test-objs) \
				     $(install-lib) $(install-lib.so) \
				     $(install-lib.so:%.so=%_pic.a))
	-rm -f core
	-rm -f $(objpfx)rtld-*.os
	$(rmobjs)
define rmobjs
$(foreach o,$(object-suffixes-for-libc),
-rm -f $(objpfx)stamp$o $(o-objects))
endef

# Also remove the dependencies and generated source files.
common-clean: common-mostlyclean
	-rm -f $(addprefix $(objpfx),$(generated))
	-rm -f $(objpfx)*.d $(objpfx)*.dt
	-rm -fr $(addprefix $(objpfx),$(generated-dirs))
	-rm -f $(addprefix $(common-objpfx),$(common-generated))
	-rm -f $(gen-as-const-headers:%.sym=$(common-objpfx)%.h)

# Produce a file `stubs' which contains `#define __stub_FUNCTION'
# for each function which is a stub.

ifdef objpfx
.PHONY: stubs # The parent Makefile calls this target.
stubs: $(objpfx)stubs
endif
objs-for-stubs := $(foreach o,$(object-suffixes-for-libc),$(o-objects)) \
		  $(addprefix $(objpfx),$(extra-objs))
$(objpfx)stubs: $(objs-for-stubs)
ifneq (,$(strip $(objs-for-stubs)))
	(cd $(objpfx).; $(OBJDUMP) -h $(patsubst $(objpfx)%,%,$^)) | \
	$(AWK) '/\.gnu\.glibc-stub\./ { \
		  sub(/\.gnu\.glibc-stub\./, "", $$2); \
		  stubs[$$2] = 1; } \
		END { for (s in stubs) print "#define __stub_" s }' > $@T
	mv -f $@T $@
else
	> $@
endif

ifneq (,$(strip $(gpl2lgpl)))
ifneq (,$(wildcard $(..)gpl2lgpl.sed))
# Snarf from the master source and frob the copying notice.
$(gpl2lgpl): %: $(..)gpl2lgpl.sed /home/gd/gnu/lib/%
	sed -f $^ > $@-tmp
# So I don't edit them by mistake.
	chmod a-w $@-tmp
	mv -f $@-tmp $@
endif
endif

# Local Variables:
# mode: makefile
# End: