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# Makefile for elf subdirectory of GNU C Library.
# Copyright (C) 1995, 1996 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., 675 Mass Ave,
# Cambridge, MA 02139, USA.
subdir := elf
headers = elf.h elfclass.h link.h dlfcn.h
routines = init-first $(dl-routines) \
dl-open dl-close dl-symbol dl-support
# The core dynamic linking functions are in libc for the static and
# profiled libraries.
dl-routines = $(addprefix dl-,load lookup object reloc deps \
runtime error init fini)
# But they are absent from the shared libc, because that code is in ld.so.
elide-routines.so = $(dl-routines) dl-support
# ld.so uses those routines, plus some special stuff for being the program
# interpreter and operating independent of libc.
rtld-routines := rtld $(dl-routines) dl-sysdep dl-minimal
distribute = $(rtld-routines:=.c) dynamic-link.h do-rel.h dl-machine.h \
soinit.c sofini.c ldd.sh.in linux-compat.c
extra-libs = libdl
libdl-routines := dlopen dlclose dlsym dlerror dladdr
all: # Make this the default target; it will be defined in Rules.
include ../Makeconfig
ifeq (yes,$(build-shared))
extra-objs = $(rtld-routines:=.so) soinit.so sofini.so
generated = librtld.so dl-allobjs.so
install-others = $(slibdir)/$(rtld-installed-name)
install-bin = ldd
# Make sure these things are built in the `make lib' pass so they can be used
# to run programs during the `make others' pass.
lib-noranlib: $(objpfx)$(rtld-installed-name) \
$(addprefix $(objpfx),$(extra-objs))
ifneq (,$(filter linux% linux,$(config-os)))
extra-objs += linux-compat.so
install-others += $(slibdir)/ld-linux.so.1
lib-noranlib: $(objpfx)ld-linux.so.1
endif
endif
include ../Rules
# Command to link into a larger single relocatable object.
reloc-link = $(LINK.o) -nostdlib -nostartfiles -r -o $@
$(objpfx)dl-allobjs.so: $(rtld-routines:%=$(objpfx)%.so)
$(reloc-link) $^
# Link together the dynamic linker into a single relocatable object.
# We use this to produce both the ABI-compliant and Linux-compatible
# dynamic linker shared objects below.
$(objpfx)librtld.so: $(objpfx)dl-allobjs.so \
$(patsubst %,$(common-objpfx)lib%_pic.a,\
c $(LDLIBS-c.so:-l%=%))
$(reloc-link) '-Wl,-(' $^ -lgcc '-Wl,-)'
$(objpfx)ld.so: $(objpfx)librtld.so
$(rtld-link) -Wl,-soname=$(rtld-installed-name)
$(objpfx)ld-linux.so.1: $(objpfx)librtld.so
$(rtld-link) -Wl,-soname=ld-linux.so.1
define rtld-link
$(LINK.o) -nostdlib -nostartfiles -shared -o $@ \
-Wl,-rpath=$(default-rpath) $^
endef
# The dl code in the static libc needs a default library path.
CFLAGS-dl-support.c = -D'DEFAULT_RPATH="$(default-rpath)"'
ifneq (ld.so, $(rtld-installed-name))
# Make sure ld-gnu.so.1 exists in the build directory so we can link
# against it.
$(objpfx)$(rtld-installed-name): $(objpfx)ld.so
rm -f $@
ln $< $@
endif
# The Linux-compatible dynamic linker shared object is just the same
# with one object file of compatibility initialization code added.
$(objpfx)ld-linux.so.1: $(objpfx)linux-compat.so
# Specify the dependencies of libdl.so; its commands come from the generic
# rule to build a shared library.
$(objpfx)libdl.so: $(objpfx)libdl_pic.a $(common-objpfx)libc.so $(objpfx)ld.so
$(slibdir)/$(rtld-installed-name): $(objpfx)ld.so; $(do-install-program)
$(slibdir)/ld-linux.so.1: $(objpfx)ld-linux.so.1; $(do-install-program)
$(objpfx)ldd: ldd.sh.in Makefile
sed 's%@RTLD@%$(slibdir)/$(rtld-installed-name)%g' < $< > $@.new
chmod 555 $@.new
mv -f $@.new $@
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