elf/Makefile

   1 # Makefile for elf subdirectory of GNU C Library.
   2
   3 # Copyright (C) 1995, 1996, 1997, 1998 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 not,
  18 # write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 # Boston, MA 02111-1307, USA.
  20
  21 subdir          := elf
  22
  23 headers         = elf.h bits/elfclass.h bits/dlfcn.h link.h dlfcn.h
  24 routines        = $(dl-routines) dl-open dl-close dl-symbol dl-support \
  25                   dl-addr enbl-secure
  26
  27 # The core dynamic linking functions are in libc for the static and
  28 # profiled libraries.
  29 dl-routines     = $(addprefix dl-,load cache lookup object reloc deps \
  30                                   runtime error init fini debug misc \
  31                                   version profile)
  32 # But they are absent from the shared libc, because that code is in ld.so.
  33 elide-routines.os = $(dl-routines) dl-support enbl-secure
  34
  35 # ld.so uses those routines, plus some special stuff for being the program
  36 # interpreter and operating independent of libc.
  37 rtld-routines   := rtld $(dl-routines) dl-sysdep dl-minimal
  38 rtld-map        := rtld.map
  39 distribute      = $(rtld-routines:=.c) dynamic-link.h do-rel.h dl-machine.h \
  40                   dl-hash.h soinit.c sofini.c ldd.sh.in ldd.bash.in eval.c \
  41                   genrtldtbl.awk atomicity.h dl-procinfo.h
  42
  43 extra-libs       = libdl
  44 extra-libs-others = $(extra-libs)
  45 libdl-routines  := dlopen dlclose dlsym dlvsym dlerror dladdr
  46 libdl-map       := libdl.map
  47
  48 before-compile = $(objpfx)trusted-dirs.h $(objpfx)rtldtbl.h
  49
  50
  51 all: # Make this the default target; it will be defined in Rules.
  52
  53 include ../Makeconfig
  54
  55 ifeq (yes,$(build-shared))
  56 extra-objs      = $(rtld-routines:=.os) soinit.os sofini.os eval.os
  57 generated       = librtld.os dl-allobjs.os ld.so trusted-dirs.h rtldtbl.h
  58 install-others  = $(inst_slibdir)/$(rtld-installed-name)
  59 install-bin     = ldd
  60 generated      += ldd
  61 endif
  62
  63 ifeq (yes,$(has-ldconfig))
  64 others          += ldconfig
  65 install-rootsbin = ldconfig
  66
  67 $(objpfx)ldconfig: $(objpfx)ldconfig.o
  68         $(CC) -nostdlib -nostartfiles -o $@ $(sysdep-LDFLAGS) -static         \
  69               $(addprefix $(csu-objpfx),start.o) $(+preinit)                  \
  70               $(filter-out $(addprefix $(csu-objpfx),start.o) $(+preinit)     \
  71                 $(link-extra-libs) $(common-objpfx)libc% $(+postinit),$^)     \
  72               $(link-extra-libs) $(common-objpfx)libc.a $(gnulib) $(+postinit)
  73 endif
  74
  75 include ../Rules
  76
  77
  78 ifeq (yes,$(build-shared))
  79 # Make sure these things are built in the `make lib' pass so they can be used
  80 # to run programs during the `make others' pass.
  81 lib-noranlib: $(objpfx)$(rtld-installed-name) \
  82               $(addprefix $(objpfx),$(extra-objs))
  83 endif
  84
  85 # Command to link into a larger single relocatable object.
  86 reloc-link = $(LINK.o) -nostdlib -nostartfiles -r -o $@
  87
  88 $(objpfx)dl-allobjs.os: $(rtld-routines:%=$(objpfx)%.os)
  89         $(reloc-link) $^
  90
  91 # Link together the dynamic linker into a single relocatable object.
  92 $(objpfx)librtld.os: $(objpfx)dl-allobjs.os $(common-objpfx)libc_pic.a
  93         $(reloc-link) '-Wl,-(' $^ -lgcc '-Wl,-)'
  94
  95 # Do we need a linker script?
  96 rtld-ldscript-in := $(firstword $(wildcard $(+sysdep_dirs:%=%/rtld-ldscript.in)))
  97 ifneq (,$(rtld-ldscript-in))
  98 LDFLAGS-rtld = -T $(objpfx)rtld-ldscript
  99
 100 before-compile += $(objpfx)rtld-ldscript
 101 rtld-parms = $(wildcard $(+sysdep_dirs:%=%/rtld-parms))
 102 include $(rtld-parms)
 103 generated += rtld-ldscript
 104 $(objpfx)rtld-ldscript: $(rtld-ldscript-in) $(rtld-parms)
 105         sed -e 's#@@rtld-oformat@@#$(rtld-oformat)#' \
 106             -e 's#@@rtld-arch@@#$(rtld-arch)#' \
 107             -e 's#@@rtld-entry@@#$(rtld-entry)#' \
 108             -e 's#@@rtld-base@@#$(rtld-base)#' $< >$@
 109
 110 $(objpfx)ld.so: $(objpfx)librtld.os $(objpfx)rtld-ldscript
 111         $(rtld-link) -Wl,-soname=$(rtld-installed-name)
 112
 113 define rtld-link
 114 $(LINK.o) -nostdlib -nostartfiles -shared -o $@ \
 115           -Wl,-rpath=$(default-rpath) $(LDFLAGS-rtld) \
 116           $(filter-out $(objpfx)rtld-ldscript,$^) \
 117           -Wl,--version-script=$(rtld-map)
 118 endef
 119 else
 120 $(objpfx)ld.so: $(objpfx)librtld.os
 121         $(rtld-link) -Wl,-soname=$(rtld-installed-name)
 122
 123 define rtld-link
 124 $(LINK.o) -nostdlib -nostartfiles -shared -o $@ \
 125           -Wl,-rpath=$(default-rpath) $^ \
 126           -Wl,--version-script=$(rtld-map)
 127 endef
 128 endif
 129
 130 # The dl code in the static libc needs a default library path.
 131 CFLAGS-dl-support.c = -D'DEFAULT_RPATH="$(default-rpath)"'
 132
 133 ifneq (ld.so,$(rtld-installed-name))
 134 # Make sure ld.so.1 exists in the build directory so we can link
 135 # against it.
 136 $(objpfx)$(rtld-installed-name): $(objpfx)ld.so
 137         rm -f $@
 138         ln -s $(<F) $@
 139 generated += $(rtld-installed-name)
 140 endif
 141
 142 # Build a file mentioning all trustworthy directories to look for shared
 143 # libraries when using LD_LIBRARY_PATH in a setuid program.  The user can
 144 # add directories to the list by defining $(user-defined-trusted-dirs)
 145 # before starting make.
 146 $(objpfx)trusted-dirs.h: Makefile
 147         $(make-target-directory)
 148         (for dir in `echo "$(default-rpath) $(user-defined-trusted-dirs)" |   \
 149                      sed 's/:/ /g'`; do                                       \
 150            echo "  \"$$dir\",";                                               \
 151          done;) > $@T
 152         mv -f $@T $@
 153 $(objpfx)rtldtbl.h: Makefile
 154         $(make-target-directory)
 155         echo "$(default-rpath)" | awk -f genrtldtbl.awk > $@T
 156         mv -f $@T $@
 157 CPPFLAGS-dl-load.c = -I$(objdir)/$(subdir)
 158 CFLAGS-dl-load.c += -Wno-uninitialized
 159
 160 # Specify the dependencies of libdl.so; its commands come from the generic
 161 # rule to build a shared library.
 162 $(objpfx)libdl.so: $(objpfx)libdl_pic.a $(common-objpfx)libc.so $(objpfx)ld.so
 163
 164 $(inst_slibdir)/$(rtld-version-installed-name): $(objpfx)ld.so
 165         $(do-install-program)
 166
 167 $(inst_slibdir)/$(rtld-installed-name): \
 168   $(inst_slibdir)/$(rtld-version-installed-name)
 169         $(make-shlib-link)
 170
 171 # Special target called by parent to install just the dynamic linker.
 172 .PHONY: ldso_install
 173 ldso_install: $(inst_slibdir)/$(rtld-installed-name)
 174
 175 ifneq ($(have-bash2),yes)
 176 $(objpfx)ldd: ldd.sh.in $(common-objpfx)version.mk \
 177               $(common-objpfx)soversions.mk $(common-objpfx)config.make
 178         sed -e 's%@RTLD@%$(slibdir)/$(rtld-installed-name)%g' \
 179             -e 's%@VERSION@%$(version)%g' < $< > $@.new
 180         chmod 555 $@.new
 181         mv -f $@.new $@
 182 else
 183 $(objpfx)ldd: ldd.bash.in $(common-objpfx)version.mk \
 184               $(common-objpfx)soversions.mk $(common-objpfx)config.make
 185         sed -e 's%@BASH@%$(BASH)%g' \
 186             -e 's%@RTLD@%$(slibdir)/$(rtld-installed-name)%g' \
 187             -e 's%@VERSION@%$(version)%g' \
 188             -e 's%@TEXTDOMAINDIR@%$(localedir)%g' < $< > $@.new
 189         chmod 555 $@.new
 190         mv -f $@.new $@
 191 endif
 192 \f
 193 # muwahaha
 194
 195 LDFLAGS-dl.so = -Wl,-dynamic-linker,$(slibdir)/$(rtld-installed-name)
 196 $(objpfx)libdl.so: $(objpfx)eval.os