csu/Makefile

   1 # Makefile for csu code for GNU C library.
   2
   3 # Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000 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
   8 # as published by the Free Software Foundation; either version 2 of
   9 # the 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 # This directory contains the C startup code (that which calls main).  This
  22 # consists of the startfile, built from start.c and installed as crt0.o
  23 # (traditionally) or crt1.o (for ELF).  In ELF we also install crti.o and
  24 # crtn.o, special "initializer" and "finalizer" files used in the link
  25 # to make the .init and .fini sections work right; both these files are
  26 # built (in an arcane manner) from initfini.c.
  27
  28 subdir := csu
  29
  30 routines = init-first libc-start $(libc-init) sysdep version check_fds
  31 csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.o)
  32 extra-objs = start.o gmon-start.o \
  33              $(start-installed-name) g$(start-installed-name) $(csu-dummies)
  34 omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
  35                               b$(start-installed-name) $(csu-dummies))
  36 install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
  37 ifeq (yes,$(build-bounded))
  38 extra-objs += b$(start-installed-name)
  39 install-lib += b$(start-installed-name)
  40 endif
  41 distribute = initfini.c gmon-start.c start.c defs.awk munch.awk \
  42              abi-note.S init.c munch-tmpl.c
  43 generated = version-info.h
  44 before-compile = $(objpfx)version-info.h
  45
  46 all: # Make this the default target; it will be defined in Rules.
  47
  48 include ../Makeconfig
  49
  50 ifeq (yes,$(elf))
  51 before-compile += $(objpfx)abi-tag.h
  52 generated += abi-tag.h
  53 endif
  54
  55 ifeq (yes,$(gnu-ld))
  56 libc-init = set-init
  57 else
  58 libc-init = munch-init
  59 $(objpfx)munch-init.c: munch.awk munch-tmpl.c $(+subdir_inits)
  60         $(AWK) -f $< subdirs='$(+init_subdirs)' $(word 2,$^) > $@-t
  61         mv -f $@-t $@
  62 generated += munch-init.c
  63
  64 # All initialization source files.
  65 +subdir_inits   := $(wildcard $(foreach dir,$(subdirs),$(dir)/init-$(dir).c))
  66 # All subdirectories containing initialization source files.
  67 +init_subdirs   := $(patsubst %/,%,$(dir $(+subdir_inits)))
  68 endif
  69
  70 ifeq ($(have-initfini),yes)
  71
  72 CPPFLAGS += -DHAVE_INITFINI
  73
  74 # These are the special initializer/finalizer files.  They are always the
  75 # first and last file in the link.  crti.o ... crtn.o define the global
  76 # "functions" _init and _fini to run the .init and .fini sections.
  77 crtstuff = crti crtn
  78
  79 install-lib += $(crtstuff:=.o)
  80 extra-objs += $(crtstuff:=.o)
  81 generated += $(crtstuff:=.S) initfini.s defs.h
  82 omit-deps += $(crtstuff)
  83
  84 # Special rules for the building of crti.o and crtn.o
  85 $(objpfx)crt%.o: $(objpfx)crt%.S $(objpfx)defs.h
  86         $(compile.S) -g0 $(ASFLAGS-.os) -o $@
  87
  88 CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions
  89
  90 vpath initfini.c $(full_config_sysdirs)
  91
  92 $(objpfx)initfini.s: initfini.c
  93         $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
  94                 $(patsubst -f%,-fno-%,$(exceptions)) -o $@
  95
  96 # We only have one kind of startup code files.  Static binaries and
  97 # shared libraries are build using the PIC version.
  98 $(objpfx)crti.S: $(objpfx)initfini.s
  99         sed -n -e '1,/@HEADER_ENDS/p' \
 100                -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
 101                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 102
 103 $(objpfx)crtn.S: $(objpfx)initfini.s
 104         sed -n -e '1,/@HEADER_ENDS/p' \
 105                -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
 106                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 107
 108 $(objpfx)defs.h: $(objpfx)initfini.s
 109         sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
 110                 $(AWK) -f defs.awk > $@
 111
 112 endif
 113
 114 ifeq (yes,$(elf))
 115 extra-objs += abi-note.o init.o
 116 asm-CPPFLAGS += -I$(objpfx).
 117 endif
 118
 119 include ../Rules
 120
 121 # Make these in the lib pass so they're available in time to link things with.
 122 subdir_lib: $(extra-objs:%=$(objpfx)%)
 123
 124 define link-relocatable
 125 $(CC) -nostdlib -nostartfiles -r -o $@ $^
 126 endef
 127
 128 ifndef start-installed-name-rule
 129 ifeq (yes,$(elf))
 130 # We link the ELF startfile along with a SHT_NOTE section indicating
 131 # the kernel ABI the binaries linked with this library will require.
 132 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
 133                                   $(objpfx)init.o
 134         $(link-relocatable)
 135 $(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \
 136                                   $(objpfx)init.ob
 137         $(link-relocatable)
 138 else
 139 # The startfile is installed under different names, so we just call our
 140 # source file `start.c' and copy to the installed name after compiling.
 141 $(objpfx)$(start-installed-name): $(objpfx)start.o
 142         rm -f $@
 143         ln $< $@
 144 $(objpfx)b$(start-installed-name): $(objpfx)start.ob
 145         rm -f $@
 146         ln $< $@
 147 endif
 148 endif
 149
 150 # The profiling startfile is made by linking together the normal
 151 # startfile with gmon-start.o, which defines a constructor function
 152 # to turn on profiling code at startup.
 153 $(objpfx)g$(start-installed-name): $(objpfx)$(start-installed-name) \
 154                                    $(objpfx)gmon-start.o
 155         $(link-relocatable)
 156
 157 # These extra files are sometimes expected by system standard linking
 158 # procedures, but we have nothing for them to do.  So compile empty files.
 159 $(addprefix $(objpfx),$(filter-out $(start-installed-name),$(csu-dummies))):
 160         cp /dev/null $(@:.o=.c)
 161         $(COMPILE.c) $(@:.o=.c) $(OUTPUT_OPTION)
 162         rm -f $(@:.o=.c)
 163
 164 # These headers are used by the startup code.
 165 $(objpfx)abi-tag.h: $(..)abi-tags
 166         $(make-target-directory)
 167         rm -f $@.new
 168         sed -e 's/#.*$$//' -e '/^[      ]*$$/d' $< | \
 169         while read conf tag; do \
 170           test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
 171                      : "$$conf"` != 0 || continue; \
 172           echo "$$tag" | \
 173           sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
 174               -e 's/ /,/g' -e 's/^ */#define ABI_TAG /' > $@.new; \
 175         done
 176         if test -r $@.new; then mv -f $@.new $@; \
 177         else echo >&2 'This configuration not matched in $<'; exit 1; fi
 178
 179 all-Banner-files = $(wildcard $(addsuffix /Banner, \
 180                                         $(addprefix $(..), $(subdirs))))
 181 $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
 182         $(make-target-directory)
 183         (case $(config-os) in \
 184            linux*) version=`(echo -e "#include <linux/version.h>\nUTS_RELEASE"\
 185                              | $(CC) -E -P - | \
 186                              sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
 187                    if [ -z "$$version" ]; then \
 188                      if [ -r /proc/version ]; then \
 189                        version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
 190                                 < /proc/version`; \
 191                      else \
 192                        version=`uname -r`; \
 193                      fi; \
 194                    fi; \
 195                    os=`uname -s 2> /dev/null`; \
 196                    if [ -z "$$os" ]; then \
 197                      os=Linux; \
 198                    fi; \
 199                    echo "\"Compiled on a $$os $$version system" \
 200                         "on `date +%Y-%m-%d`.\\n\"" ;; \
 201            *) ;; \
 202          esac; \
 203          files="$(all-Banner-files)";                           \
 204          if test -n "$$files"; then                             \
 205            echo "\"Available extensions:";                      \
 206            sed -e '/^#/d' -e 's/^[[:space:]]*/  /' $$files;     \
 207            echo "\"";                                           \
 208          fi) > $@T
 209         mv -f $@T $@