Makerules

# Copyright (C) 1991-1999, 2000,2001 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 Library General Public License as
# published by the Free Software Foundation; either version 2 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
# Library General Public License for more details.

# You should have received a copy of the GNU Library General Public
# License along with the GNU C Library; see the file COPYING.LIB.  If not,
# write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.

#
#	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

# `configure' writes a definition of `config-sysdirs' in `config.make'.
sysdirs = $(strip $(full_config_sysdirs))

+sysdir_pfx = $(common-objpfx)

export sysdirs := $(sysdirs)

+sysdep_dirs := $(full_config_sysdirs)
ifdef objdir
+sysdep_dirs := $(objdir) $(+sysdep_dirs)
endif

# Add -I switches to get the right sysdep directories.
# `+includes' in Makeconfig references $(+sysdep-includes).
+sysdep-includes := $(addprefix -I,$(+sysdep_dirs))

# 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 $(full_config_sysdirs:=/Makefile))
ifneq (,$(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 ($(versioning),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 # $(versioning) = yes


# 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

# 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.

# When making the list of .d files to include, we can't know which ones
# have source in .s files, and thus do not in fact need a .d file.
# So we must define rules to make .d files for .s files.
define make-dummy-dep
$(addprefix ln $(common-objpfx)dummy.d ,$(filter-out $(wildcard $@),$@))
endef
$(common-objpfx)dummy.d:
	echo '# .s files cannot contain includes, so they need no deps.' > $@

# It matters that this set of rules, for compiling from sources in
# the current directory (the $srcdir/$subdir) come before the
# generated sysdep rules in included from sysd-rules below.  When
# compiling in the source tree, generated sources go into the current
# directory, and those should be chosen before any sources in sysdeps.
define o-iterator-doit
$(objpfx)%$o: %.S $(before-compile); $$(compile-command.S)
endef
object-suffixes-left := $(all-object-suffixes)
include $(o-iterator)
$(objpfx)%.d: %.S $(before-compile); $(+make-deps)

define o-iterator-doit
$(objpfx)%$o: %.s $(before-compile); $$(compile-command.s)
endef
object-suffixes-left := $(all-object-suffixes)
include $(o-iterator)
$(objpfx)%.d: %.s $(common-objpfx)dummy.d; $(make-dummy-dep)

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

# 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)
$(objpfx)%.d: $(objpfx)%.S $(before-compile); $(+make-deps)

define o-iterator-doit
$(objpfx)%$o: $(objpfx)%.s $(before-compile); $$(compile-command.s)
endef
object-suffixes-left := $(all-object-suffixes)
include $(o-iterator)
$(objpfx)%.d: $(objpfx)%.s $(common-objpfx)dummy.d; $(make-dummy-dep)

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

# System-dependent makefiles can put in `inhibit-sysdep-asm' wildcard
# patterns matching sysdep directories whose assembly source files should
# be suppressed.
ifdef inhibit-sysdep-asm
define open-check-inhibit-asm
case $$sysdir in $(subst $(empty) ,|,$(inhibit-sysdep-asm))) : ;; *)
endef
close-check-inhibit-asm = ;; esac ;
endif

-include $(+sysdir_pfx)sysd-rules
ifneq ($(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
$(+sysdir_pfx)sysd-rules: $(+sysdir_pfx)config.make $(..)Makerules \
			  $(wildcard $(foreach dir,$(sysdirs),\
					       $(dir)/Makefile))\
			  $(sysd-rules-force)
	-@rm -f $@T
	(echo 'sysd-rules-sysdirs := $(config-sysdirs)';		      \
	 for dir in $(config-sysdirs:%='$$(..)%'); do			      \
	   for o in $(all-object-suffixes); do \
	     $(open-check-inhibit-asm) \
	     echo "\$$(objpfx)%$$o: $$dir/%.S \$$(before-compile); \
		  \$$(compile-command.S)";				      \
	     echo "\$$(objpfx)%$$o: $$dir/%.s \$$(before-compile); \
		  \$$(compile-command.s)";				      \
	     $(close-check-inhibit-asm)	\
	     echo "\$$(objpfx)%$$o: $$dir/%.c \$$(before-compile); \
		  \$$(compile-command.c)";				      \
	   done; \
	   $(open-check-inhibit-asm) \
	   echo "\$$(objpfx)%.d: $$dir/%.s \$$(common-objpfx)dummy.d; \
		\$$(make-dummy-dep)";			       \
	   echo "\$$(objpfx)%.d: $$dir/%.S \$$(before-compile); \
		\$$(+make-deps)";					      \
	   $(close-check-inhibit-asm)	\
	   echo "\$$(objpfx)%.d: $$dir/%.c \$$(before-compile); \
		\$$(+make-deps)";					      \
	 done;								      \
	 echo 'sysd-rules-done = t') > $@T
	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

# Generate version maps, but wait until sysdep-subdirs is known
ifeq ($(sysd-sorted-done),t)
ifeq ($(versioning),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

ifndef avoid-generated
ifneq ($(sysd-versions-subdirs),$(all-subdirs) $(config-sysdirs))
sysd-versions-force = FORCE
FORCE:
endif
$(common-objpfx)Versions.all: $(..)scripts/firstversions.awk \
			      $(common-objpfx)soversions.i \
	                      $(..)Versions.def \
			      $(wildcard $(add-ons:%=$(..)%/Versions.def))
	{ while read lib version setname; do \
	    test -z "$$setname" || echo "$$lib : $$setname"; \
	  done < $(word 2,$^); \
	  cat $(filter-out $< $(word 2,$^),$^) \
	  | $(preprocess-versions); \
	} | LC_ALL=C $(AWK) -f $< > $@T
	mv -f $@T $@
$(common-objpfx)sysd-versions: $(common-objpfx)Versions.all \
			       $(..)scripts/versions.awk \
			       $(wildcard $(all-subdirs:%=$(..)%/Versions)) \
			       $(wildcard $(sysdirs:%=%/Versions)) \
			       $(sysd-versions-force)
	( echo 'sysd-versions-subdirs = $(all-subdirs) $(config-sysdirs)' ; \
	  cat $(filter-out $< $(word 2,$^) $(sysd-versions-force),$^) \
	  | $(preprocess-versions) \
	  | LC_ALL=C $(AWK) -v buildroot=$(common-objpfx) -v defsfile=$< \
			    -v move_if_change='$(move-if-change)' \
			    -f $(word 2,$^); \
	) > $@T
	mv -f $@T $@
endif # avoid-generated
endif # $(versioning) = yes
endif # sysd-sorted-done


ifndef compile-command.S
compile-command.S = $(compile.S) $(OUTPUT_OPTION)
endif
ifndef compile-command.s
compile-command.s = $(COMPILE.s) $< $(OUTPUT_OPTION)
endif
ifndef compile-command.c
compile-command.c = $(compile.c) $(OUTPUT_OPTION)
endif

# GCC can grok options after the file name, and it looks nicer that way.
compile.c = $(CC) $< -c $(CFLAGS) $(CPPFLAGS)
compile.S = \
  $(CC) $< -c $(CPPFLAGS) -DASSEMBLER $(asm-CPPFLAGS) $(ASFLAGS-$(suffix $@))
COMPILE.S = \
  $(CC) -c $(CPPFLAGS) -DASSEMBLER $(asm-CPPFLAGS) $(ASFLAGS-$(suffix $@))
COMPILE.s = $(filter-out -pipe,$(CC)) -c $(ASFLAGS)

# If we want to generate MD% checksums for the sources do this now.
ifeq ($(md5),yes)
generate-md5 = ; rm -f $(@:.d=.md5); \
$(CC) -E $< $(CFLAGS) $(CPPFLAGS) $($(<:$*.%=%)-CPPFLAGS) | \
sed '/^\#/d;/^[[:space:]]*$$/d' | md5sum > $(@:.d=.md5)
else
generate-md5 =
endif

# 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 $@

S-CPPFLAGS = $(asm-CPPFLAGS)
define +make-deps
$(make-target-directory)
-@rm -f $@
$(+mkdep) $< $(CFLAGS) $(CPPFLAGS) $($(<:$*.%=%)-CPPFLAGS) | \
sed \
-e 's,$(subst .,\.,$*)\.o,$(foreach o,$(all-object-suffixes),$(@:.d=$o)) $@,' \
$(sed-remove-objpfx) > $(@:.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 (yesyes,$(build-shared)$(elf))
ifndef libc.so-version
# Undefine this because it can't work when we libc.so is unversioned.
static-only-routines =
endif
endif

# Bounded pointer thunks are only built for *.ob
elide-bp-thunks = $(addprefix $(bppfx),$(bp-thunks))

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

# 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-bp-thunks)
elide-routines.op += $(shared-only-routines) $(elide-bp-thunks)
elide-routines.og += $(shared-only-routines) $(elide-bp-thunks)
elide-routines.ob += $(shared-only-routines)

# Shared library building.

ifeq (yes,$(build-shared))

# Reference map file only when versioning is selected and a map file name
# is given.
ifeq ($(versioning),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

# 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.
lib%.so: lib%_pic.a $(+preinit) $(+postinit) $(+interp)
ifneq (,$(findstring aix,$(config-os)))
	(echo '#!'; \
	 dump -g $< | sed '1,6d' | cut -f2 | sort | uniq) > $(<:a=exp)
endif
	$(build-shlib)

ifeq ($(elf),yes)
define build-shlib-helper
$(LINK.o) -shared -Wl,-O1 $(sysdep-LDFLAGS) $(config-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=$(rpath-link)
endef
else
ifneq (,$(findstring aix,$(config-os)))
define build-shlib-helper
$(LINK.o) -G -bM:SRE -bnoentry -bE:$(<:a=exp) \
	  $(sysdep-LDFLAGS) $(config-LDFLAGS) $(extra-B-$(@F:lib%.so=%).so) \
	  $(extra-B-$(@F:lib%.so=%).so) $(load-map-file) \
	  $(LDFLAGS.so) $(LDFLAGS-$(@F:lib%.so=%).so) \
	  -L$(subst :, -L,$(rpath-link))
endef
else
endif
endif

ifeq (yes,$(elf))
# binutils only position loadable notes into the first page for binaries,
# not for shared objects
define build-shlib
$(build-shlib-helper) \
	  -o $@.new $(csu-objpfx)abi-note.o -Wl,--verbose \
	  $(LDLIBS-$(@F:lib%.so=%).so) 2>&1 | \
	  sed -e '/^=========/,/^=========/!d;/^=========/d' \
	      -e 's/^.*\.hash[ 	]*:.*$$/  .note.ABI-tag : { *(.note.ABI-tag) } &/' \
	  > $@.lds
rm -f $@.new
$(build-shlib-helper) -o $@ -T $@.lds \
	  $(csu-objpfx)abi-note.o $(build-shlib-objlist)
rm -f $@.lds
endef
else
ifneq (,$(findstring aix,$(config-os)))
define build-shlib
$(build-shlib-helper) \
	-o $@ \
	$(filter-out $(map-file) $(+preinit) $(+postinit),$^) \
	$(no-whole-archive) $(LDLIBS-$(@F:lib%.so=%).so)
endef
define build-shlib
$(build-shlib-helper) \
	  $(build-shlib-objlist)
endef
endif
endif

ifneq (,$(findstring aix,$(config-os)))
define build-module-helper
$(LINK.o) -Wl,-G -Wl,-bM:SRE -Wl,-bnoentry -Wl,-bexpall \
	  $(sysdep-LDFLAGS) $(config-LDFLAGS) \
	  $(load-map-file) \
	  $(LDFLAGS.so) $(LDFLAGS-$(@F:%.so=%).so) \
	  -L$(subst :, -L,$(rpath-link)) -Wl,-L=$(rpath-link)
endef
else
define build-module-helper
$(LINK.o) -shared $(sysdep-LDFLAGS) $(config-LDFLAGS) \
	  -B$(csu-objpfx) $(load-map-file) \
	  $(LDFLAGS.so) $(LDFLAGS-$(@F:%.so=%).so) \
	  -L$(subst :, -L,$(rpath-link)) -Wl,-rpath-link=$(rpath-link)
endef
endif

# 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'.
ifeq (yes,$(elf))
# binutils only position loadable notes into the first page for binaries,
# not for shared objects
define build-module
$(build-module-helper) \
	  -o $@.new $(csu-objpfx)abi-note.o -Wl,--verbose \
	  $(LDLIBS-$(@F:lib%.so=%).so) 2>&1 | \
	  sed -e '/^=========/,/^=========/!d;/^=========/d' \
	      -e 's/^.*\.hash[ 	]*:.*$$/  .note.ABI-tag : { *(.note.ABI-tag) } &/' \
	  > $@.lds
rm -f $@.new
$(build-module-helper) -o $@ -T $@.lds \
	  $(csu-objpfx)abi-note.o $(build-module-objlist)
rm -f $@.lds
endef
else
ifneq (,$(findstring aix,$(config-os)))
define build-module
$(build-module-helper) \
	  -o $@ \
	  $(filter-out $(map-file) $(+preinit) $(+postinit),$^) \
	  $(no-whole-archive) $(LDLIBS-$(@F:%.so=%).so)
endef
else
define build-module
define build-module
$(build-module-helper) \
	  -o $@ \
	  $(build-module-objlist)
endef
endif
endif

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

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 $(gnulib).
LDLIBS-c.so += $(gnulib)
# Give libc.so an entry point and make it directly runnable itself.
LDFLAGS-c.so += -e __libc_main
# Force the backward compatibility EH functions to be linked.
LDFLAGS-c.so += -u __register_frame
# Pre-link the objects of libc_pic.a so that we can locally resolve
# COMMON symbols before we link against ld.so.  This is because ld.so
# contains some of libc_pic.a already, which will prevent the COMMONs
# from being allocated in libc.so, which introduces evil dependencies
# between libc.so and ld.so, which can make it impossible to upgrade.
ifeq ($(elf),yes)
$(common-objpfx)libc_pic.os: $(common-objpfx)libc_pic.a
	$(LINK.o) -nostdlib -nostartfiles -r -o $@ \
	$(LDFLAGS-c_pic.os) -Wl,-d -Wl,--whole-archive $^
# Use our own special initializer and finalizer files for libc.so.
$(common-objpfx)libc.so: $(elfobjdir)/soinit.os \
			 $(common-objpfx)libc_pic.os \
			 $(elfobjdir)/sofini.os \
			 $(elfobjdir)/interp.os $(elfobjdir)/ld.so
	$(build-shlib)
ifeq ($(versioning),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
else
ifneq (,$(findstring aix,$(config-os)))
$(common-objpfx)libc.so: $(common-objpfx)libc_pic.a
	@rm -f $@
	(echo '#!'; \
	 dump -g $^ | sed '1,6d' | cut -f2 | sort | uniq) > $(^:a=exp)
	sed '/__mulh/d;/__mull/d;/__divss/d;/__divus/d;/__quoss/d;/__quous/d' \
	    /lib/syscalls.exp > $(common-objpfx)syscalls.exp
	$(LINK.o) -G -bM:SRE -bnoentry -bE:$(^:a=exp) \
		  -bE:$(common-objpfx)syscalls.exp \
		  -bI:$(common-objpfx)syscalls.exp \
		  -L$(common-objpfx) -o $@ $^
# AIX runtime ld wants libc.so to be libc.a(shr.o) hardwired
	cp $@ $(common-objpfx)shr.o
	$(AR) $(ARFLAGS) $(common-objpfx)libc.a $(common-objpfx)shr.o
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".
# We also add bounded-pointer thunks, which are later
# elided for all suffixes except for `.ob'.
override objects := $(addprefix $(objpfx),$(sources:.c=.o) \
		      $(patsubst %,$(bppfx)%.o,\
			$(filter $(routines) $(sysdep_routines),$(bp-thunks))))


# 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

+depfiles := $(sources:.c=.d) \
	     $(patsubst %.o,%.d,$(filter %.o,$(extra-objs:.os=.o))) \
	     $(addsuffix .d,$(tests) $(test-srcs))
ifeq ($(build-programs),yes)
+depfiles += $(addsuffix .d,$(others) $(sysdep-others))
endif
+depfiles := $(addprefix $(objpfx),\
			 $(filter-out $(addsuffix .d,$(omit-deps)),\
				      $(+depfiles)))

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 /.
	mkdir $(@:%/=%)

# 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
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 $(common-objpfx)%,%,$^)`
$(RANLIB) $@
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 $(objpfx)%,%,$^)
$(RANLIB) $@
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) and $(install-sbin) are installed from the
# object directory into $(bindir) and $(sbindir), respectively.
# $(install-others) 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%) $@
# Running ranlib after installing makes the __.SYMDEF time stamp up to
# date, which avoids messages from some linkers.
	$(RANLIB) $@

define do-install-program
$(make-target-directory)
$(INSTALL_PROGRAM) $< $@.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))

install-lib-nosubdir: $(install-lib.so-versioned:%=$(inst_libdir)/%) \
		      $(install-lib.so-unversioned:%=$(inst_slibdir)/%)

# 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 $(<F) $@ >> $(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) $(<F) $@
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)

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: $(common-objpfx)libc.so$(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.  */';\
	 echo 'GROUP ( $(slibdir)/libc.so$(libc.so-version)' \
	      '$(libdir)/$(patsubst %,$(libtype.oS),$(libprefix)$(libc-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 := $(versioned)
include $(o-iterator)

# 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-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)
	$(patsubst %,$(RANLIB) $@,$(filter-out $(non-lib.a),$(<F)))
endif
endif
ifdef install-data
$(addprefix $(inst_datadir)/,$(install-data)): $(inst_datadir)/%: % $(+force)
	$(do-install)
endif
headers := $(strip $(headers))
ifdef headers
$(addprefix $(inst_includedir)/,$(headers)): $(inst_includedir)/%: % $(+force)
	$(do-install)
endif	# headers

.PHONY: install-bin-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-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)

# 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
ifeq ($(build-programs),yes)
install-no-libc.a-nosubdir: install-headers-nosubdir install-data-nosubdir\
			    install-bin-nosubdir install-lib-nosubdir	\
			    install-others-nosubdir install-rootsbin-nosubdir \
			    install-sbin-nosubdir
else
install-no-libc.a-nosubdir: install-headers-nosubdir install-data-nosubdir\
			    install-lib-nosubdir install-others-nosubdir
endif
install: install-no-libc.a-nosubdir

# Command to compile $< in $(objdir) using the native libraries.
define native-compile
$(make-target-directory)
$(patsubst %/,cd % &&,$(objpfx)) \
$(BUILD_CC) $($(basename $(<F))-CFLAGS) $(ALL_BUILD_CFLAGS) \
	    $(firstword $(filter /%,$< $(shell pwd)/$<)) -o $(@F)
endef

# Command to compile $< in $(common-objdir) using the native libraries.
# We must cd to $(objdir) anyway so that $(..)config.h is valid.
define common-objdir-compile
$(patsubst %/,cd % &&,$(objpfx)) \
$(BUILD_CC) $($(basename $(<F))-CFLAGS) $(ALL_BUILD_CFLAGS) \
	    $(firstword $(filter /%,$< $(shell pwd)/$<)) -o $(..)$(@F)
endef

# We always want to use configuration definitions.
# Note that this is only used for commands running in $(objpfx).
ALL_BUILD_CFLAGS = $(BUILD_CFLAGS) -include $(..)config.h

# Support the GNU standard name for this target.
.PHONY: check
check: tests

.PHONY: TAGS
TAGS: $(objpfx)distinfo $(..)MakeTAGS
	$(MAKE) $(addprefix -f ,$^) $@

$(..)po/%.pot: $(objpfx)distinfo $(..)MakeTAGS FORCE
	$(MAKE) $(addprefix -f ,$(filter-out FORCE,$^)) $@
FORCE:


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


# 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) $(test-srcs)) \
				     $(addsuffix -bp.out,$(tests) $(test-srcs)))

# Remove the object files.
common-mostlyclean:
	-rm -f $(addprefix $(objpfx),$(tests) $(test-srcs) $(others) \
				     $(sysdep-others) stubs \
				     $(addsuffix .o,$(tests) $(test-srcs) \
						    $(others) \
						    $(sysdep-others)) \
				     $(addsuffix -bp,$(tests) $(test-srcs)) \
				     $(addsuffix .out,$(tests) $(test-srcs)) \
				     $(addsuffix -bp.out,$(tests) $(test-srcs)))
	-rm -f $(addprefix $(objpfx),$(extra-objs) $(install-lib) \
				     $(install-lib.so) \
				     $(install-lib.so:%.so=%_pic.a))
	-rm -f core
	$(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)) $(+depfiles)
	-rm -fr $(addprefix $(objpfx),$(generated-dirs))
	-rm -f $(addprefix $(common-objpfx),$(common-generated))
	-rm -f $(objpfx)distinfo

# Produce a file `stubs' which contains `#define __stub_FUNCTION'
# for each function which is a stub.  We grovel over all the .d files
# looking for references to <stub-tag.h>.  Then we grovel over each
# referenced source file to see what stub function it defines.

ifdef objpfx
.PHONY: stubs # The parent Makefile calls this target.
stubs: $(objpfx)stubs
endif
s = $(sysdep_dir)/generic
$(objpfx)stubs: $(+depfiles)
# Use /dev/null since `...` might expand to empty.
	(s=`cd $s && $(PWD_P)`; \
	 $(patsubst %/,cd % &&,$(objpfx)) \
	 sed -n 's/^stub_warning *(\([^)]*\).*$$/#define __stub_\1/p' \
	  `sed -n -e '\@ $s/[^ ]*\.c@{; s@^.* $s/\([^ ]*\.c\).*$$@'"$$s"'/\1@; h; }' \
		-e '/stub-tag\.h/{; g; p; }' \
		  $(patsubst $(objpfx)%,%,$^) /dev/null` \
	     /dev/null) > $@T
	mv -f $@T $@

# Make the distribution tar file.

.PHONY: dist
dist: $(objpfx)distinfo $(..)Make-dist
	$(MAKE) -f $< -f $(word 2,$^) $(Make-dist-args)

# Avoid depending on source files found in sysdeps dirs,
# because the references affect implicit rule selection.
dist: $(filter-out %.c %.S %.s,$(distribute))

# We used to simply export all these variables, but that frequently made the
# environment get too large.  Instead, we write all the information into
# a generated makefile fragment `distinfo', and then include it with -f in
# the sub-make that makes the distribution (above).
$(objpfx)distinfo: Makefile $(..)Makerules \
		   $(wildcard $(foreach dir,$(sysdirs),$(dir)/Makefile))
	$(make-target-directory)
	$(distinfo-vars)
	mv -f $@.new $@
.PHONY: subdir_distinfo
subdir_distinfo: $(objpfx)distinfo

define distinfo-vars
rm -f $@.new
echo > $@.new 'subdir := $(subdir)'
$(foreach var,subdir-dirs sources elided-routines sysdep_routines \
	      headers sysdep_headers distribute dont_distribute generated \
	      others tests test-srcs extra-libs $(extra-libs:%=%-routines) \
	      versioned \
	      $(addprefix install-,lib lib.so data bin sbin others),
echo >> $@.new '$(subdir)-$(var) := $($(var))'
echo >> $@.new '$(var) = $$($(subdir)-$(var))')
endef

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 $@
ifeq ($(with-cvs),yes)
	test ! -d CVS || cvs $(CVSOPTS) commit -m'Updated from $^' $@
endif
endif
endif