elf/Makefile

   1 # Makefile for elf subdirectory of GNU C Library.
   2
   3 # Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   4 # This file is part of the GNU C Library.
   5
   6 # The GNU C Library is free software; you can redistribute it and/or
   7 # modify it under the terms of the GNU Library General Public License as
   8 # published by the Free Software Foundation; either version 2 of the
   9 # License, or (at your option) any later version.
  10
  11 # The GNU C Library is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 # Library General Public License for more details.
  15
  16 # You should have received a copy of the GNU Library General Public
  17 # License along with the GNU C Library; see the file COPYING.LIB.  If
  18 # not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  19 # Cambridge, MA 02139, USA.
  20
  21 subdir          := elf
  22
  23 headers         = elf.h elfclass.h link.h dlfcn.h
  24 routines        = init-first $(dl-routines) \
  25                   dl-open dl-close dl-symbol dl-support
  26
  27 # The core dynamic linking functions are in libc for the static and
  28 # profiled libraries.
  29 dl-routines     = $(addprefix dl-,load lookup object reloc deps \
  30                                   runtime error init fini)
  31 # But they are absent from the shared libc, because that code is in ld.so.
  32 elide-routines.so = $(dl-routines) dl-support
  33
  34 # ld.so uses those routines, plus some special stuff for being the program
  35 # interpreter and operating independent of libc.
  36 rtld-routines   := rtld $(dl-routines) dl-sysdep dl-minimal
  37 distribute      = $(rtld-routines:=.c) dynamic-link.h do-rel.h dl-machine.h \
  38                   soinit.c sofini.c ldd.sh.in linux-compat.c
  39
  40 extra-libs      = libdl
  41 libdl-routines  := dlopen dlclose dlsym dlerror dladdr
  42
  43
  44 all: # Make this the default target; it will be defined in Rules.
  45
  46 include ../Makeconfig
  47
  48 ifeq (yes,$(build-shared))
  49 extra-objs      = $(rtld-routines:=.so) soinit.so sofini.so
  50 generated       = librtld.so dl-allobjs.so
  51 install-others  = $(slibdir)/$(rtld-installed-name)
  52 install-bin     = ldd
  53
  54 # Make sure these things are built in the `make lib' pass so they can be used
  55 # to run programs during the `make others' pass.
  56 lib-noranlib: $(objpfx)$(rtld-installed-name) \
  57               $(addprefix $(objpfx),$(extra-objs))
  58
  59 ifneq (,$(filter linux% linux,$(config-os)))
  60 extra-objs      += linux-compat.so
  61 install-others  += $(slibdir)/ld-linux.so.1
  62 lib-noranlib: $(objpfx)ld-linux.so.1
  63 endif
  64 endif
  65
  66 include ../Rules
  67
  68
  69 # Command to link into a larger single relocatable object.
  70 reloc-link = $(LINK.o) -nostdlib -nostartfiles -r -o $@
  71
  72 $(objpfx)dl-allobjs.so: $(rtld-routines:%=$(objpfx)%.so)
  73         $(reloc-link) $^
  74
  75 # Link together the dynamic linker into a single relocatable object.
  76 # We use this to produce both the ABI-compliant and Linux-compatible
  77 # dynamic linker shared objects below.
  78 $(objpfx)librtld.so: $(objpfx)dl-allobjs.so \
  79                      $(patsubst %,$(common-objpfx)lib%_pic.a,\
  80                                 c $(LDLIBS-c.so:-l%=%))
  81         $(reloc-link) '-Wl,-(' $^ -lgcc '-Wl,-)'
  82
  83 $(objpfx)ld.so: $(objpfx)librtld.so
  84         $(rtld-link) -Wl,-soname=$(rtld-installed-name)
  85 $(objpfx)ld-linux.so.1: $(objpfx)librtld.so
  86         $(rtld-link) -Wl,-soname=ld-linux.so.1
  87
  88 define rtld-link
  89 $(LINK.o) -nostdlib -nostartfiles -shared -o $@ \
  90           -Wl,-rpath=$(default-rpath) $^
  91 endef
  92
  93 # The dl code in the static libc needs a default library path.
  94 CFLAGS-dl-support.c = -D'DEFAULT_RPATH="$(default-rpath)"'
  95
  96 ifneq (ld.so, $(rtld-installed-name))
  97 # Make sure ld-gnu.so.1 exists in the build directory so we can link
  98 # against it.
  99 $(objpfx)$(rtld-installed-name): $(objpfx)ld.so
 100         rm -f $@
 101         ln $< $@
 102 endif
 103
 104 # The Linux-compatible dynamic linker shared object is just the same
 105 # with one object file of compatibility initialization code added.
 106 $(objpfx)ld-linux.so.1: $(objpfx)linux-compat.so
 107
 108
 109 # Specify the dependencies of libdl.so; its commands come from the generic
 110 # rule to build a shared library.
 111 $(objpfx)libdl.so: $(objpfx)libdl_pic.a $(common-objpfx)libc.so $(objpfx)ld.so
 112
 113 $(slibdir)/$(rtld-installed-name): $(objpfx)ld.so; $(do-install-program)
 114 $(slibdir)/ld-linux.so.1: $(objpfx)ld-linux.so.1; $(do-install-program)
 115
 116 $(objpfx)ldd: ldd.sh.in Makefile
 117         sed 's%@RTLD@%$(slibdir)/$(rtld-installed-name)%g' < $< > $@.new
 118         chmod 555 $@.new
 119         mv -f $@.new $@