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+# Subroutine makefile for compiling libc modules linked into dynamic linker.
+
+# Copyright (C) 2002 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, write to the Free
+# Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+# 02111-1307 USA.
+
+# This makefile is never used by itself, but only from the rtld-libc.a
+# rule in Makefile, which does make -f librtld.mk -f rtld-Rules.
+# librtld.mk is the generated file containing variable definitions for
+# `rtld-subdirs', a subset of the top-level $(subdirs) list; and for each
+# SUBDIR in $(rtld-subdirs), `rtld-SUBDIR' listing `module.os' file names.
+
+.PHONY: rtld-all
+rtld-all:
+
+# When run from the elf/Makefile to build rtld-libc.a, $(subdir) is elf.
+ifeq ($(subdir),elf)
+
+ifndef rtld-subdirs
+error This is makefile is a subroutine of elf/Makefile not to be used directly
+endif
+
+include ../Makeconfig
+
+rtld-all: $(objpfx)rtld-libc.a
+
+$(objpfx)rtld-libc.a: $(foreach dir,$(rtld-subdirs),\
+				$(addprefix $(common-objpfx)$(dir)/rtld-,\
+					    $(rtld-$(dir))))
+	@-rm -f $@T
+	$(AR) cq $@T $^
+	$(RANLIB) $@T
+	mv -f $@T $@
+
+# For each subdirectory, define a pattern rule that makes all of that
+# subdirectory's modules at once with one recursive make command.
+object-suffixes-left := $(rtld-subdirs)
+define o-iterator-doit
+$(foreach obj,$(rtld-$o),$(common-objpfx)%/rtld-$(obj)): FORCE ; \
+	+$$(rtld-subdir-make)
+endef
+include $(patsubst %,../o-iterator.mk,$(object-suffixes-left))
+
+# This is how we descend into each subdirectory.  See below.
+define rtld-subdir-make
+$(MAKE) -C ../$* objdir=$(objdir) -f Makefile -f ../elf/rtld-Rules rtld-all \
+	rtld-modules='$(addprefix rtld-,$(rtld-$*))'
+endef
+
+FORCE:
+
+else
+
+# In this case we are being run by $(rtld-subdir-make), above.
+# Some other subdir's Makefile has provided all its normal rules,
+# and we just provide some additional definitions.
+
+# These are the basic compilation rules corresponding to the Makerules ones.
+# The sysd-rules generated makefile already defines pattern rules for rtld-%
+# targets built from sysdeps source files.
+$(objpfx)rtld-%.os: %.S $(before-compile); $(compile-command.S)
+$(objpfx)rtld-%.d: %.S $(before-compile); $(+make-deps)
+$(objpfx)rtld-%.os: %.s $(before-compile); $(compile-command.s)
+$(objpfx)rtld-%.d: %.s $(before-compile); $(+make-deps)
+$(objpfx)rtld-%.os: %.c $(before-compile); $(compile-command.c)
+$(objpfx)rtld-%.d: %.c $(before-compile); $(+make-deps)
+
+# The rules for generated source files.
+$(objpfx)rtld-%.os: $(objpfx)%.S $(before-compile); $(compile-command.S)
+$(objpfx)rtld-%.d: $(objpfx)%.S $(before-compile); $(+make-deps)
+$(objpfx)rtld-%.os: $(objpfx)%.s $(before-compile); $(compile-command.s)
+$(objpfx)rtld-%.d: $(objpfx)%.s $(before-compile); $(+make-deps)
+$(objpfx)rtld-%.os: $(objpfx)%.c $(before-compile); $(compile-command.c)
+$(objpfx)rtld-%.d: $(objpfx)%.c $(before-compile); $(+make-deps)
+
+# The command line setting of rtld-modules (see above) tells us
+# what we need to build, and that tells us what dependency files we need.
+rtld-all: $(addprefix $(objpfx),$(rtld-modules))
+
+# Figure out the dependency files we need.  After respecting the $(omit-deps)
+# list as applied to the names without the `rtld-', there may be none left.
+rtld-depfiles := $(patsubst %,$(objpfx)rtld-%.d,\
+			    $(filter-out $(omit-deps),\
+					 $(rtld-modules:rtld-%.os=%)))
+ifdef rtld-depfiles
+-include $(rtld-depfiles)
+endif
+
+# Just in case we wind up e.g. regenerating dependencies for non-rtld objects,
+# we don't unconditionally modify the flags.  For rtld-% targets, use the
+# special flags set below.
+CFLAGS   += $(if $(filter rtld-%,$(@F)),$(CFLAGS-rtld))
+CPPFLAGS += $(if $(filter rtld-%,$(@F)),$(CPPFLAGS-rtld))
+
+
+# This here is the whole point of all the shenanigans.
+CPPFLAGS-rtld := -DNOT_IN_libc=1 -DIS_IN_rtld=1
+CFLAGS-rtld := # blah
+
+
+endif