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