elf/Makefile

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