csu/Makefile

   1 # Makefile for csu code for 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
   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 in 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
  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) \
  34              $(csu-dummies)
  35 omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
  36                              $(csu-dummies))
  37 install-lib = $(start-installed-name) g$(start-installed-name) \
  38               $(csu-dummies)
  39 distribute = initfini.c gmon-start.c start.c defs.awk abi-note.S init.c
  40
  41 all: # Make this the default target; it will be defined in Rules.
  42
  43 include ../Makeconfig
  44
  45 ifeq ($(elf),yes)
  46 before-compile = $(objpfx)abi-tag.h
  47 generated += abi-tag.h
  48 endif
  49
  50 ifeq ($(have-initfini),yes)
  51
  52 CPPFLAGS += -DHAVE_INITFINI
  53
  54 # These are the special initializer/finalizer files.  They are always the
  55 # first and last file in the link.  crti.o ... crtn.o define the global
  56 # "functions" _init and _fini to run the .init and .fini sections.
  57 crtstuff = crti crtn
  58
  59 install-lib += $(crtstuff:=.o)
  60 extra-objs += $(crtstuff:=.o)
  61 generated += $(crtstuff:=.S) initfini.s defs.h
  62 omit-deps += $(crtstuff)
  63
  64 # Special rules for the building of crti.o and crtn.o
  65 $(objpfx)crt%.o: $(objpfx)crt%.S $(objpfx)defs.h
  66         $(compile.S) -g0 $(ASFLAGS-.os) -o $@
  67
  68 CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions
  69
  70 $(objpfx)initfini.s: initfini.c
  71         $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
  72                 $(no-exceptions) -o $@
  73
  74 # We only have one kind of startup code files.  Static binaries and
  75 # shared libraries are build using the PIC version.
  76 $(objpfx)crti.S: $(objpfx)initfini.s
  77         sed -n -e '1,/@HEADER_ENDS/p' \
  78                -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
  79                -e '/@TRAILER_BEGINS/,$$p' $< > $@
  80
  81 $(objpfx)crtn.S: $(objpfx)initfini.s
  82         sed -n -e '1,/@HEADER_ENDS/p' \
  83                -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
  84                -e '/@TRAILER_BEGINS/,$$p' $< > $@
  85
  86 $(objpfx)defs.h: $(objpfx)initfini.s
  87         sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
  88                 awk -f defs.awk > $@
  89
  90 endif
  91
  92 ifeq (yes,$(elf))
  93 extra-objs += abi-note.o init.o
  94 asm-CPPFLAGS += -I$(objpfx).
  95 endif
  96
  97 include ../Rules
  98
  99 define link-relocatable
 100 $(CC) -nostdlib -nostartfiles -r -o $@ $^
 101 endef
 102
 103 ifndef start-installed-name-rule
 104 ifeq (yes,$(elf))
 105 # We link the ELF startfile along with a SHT_NOTE section indicating
 106 # the the kernel ABI the binaries linked with this library will require.
 107 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
 108                                   $(objpfx)init.o
 109         $(link-relocatable)
 110 else
 111 # The startfile is installed under different names, so we just call our
 112 # source file `start.c' and copy to the installed name after compiling.
 113 $(objpfx)$(start-installed-name): $(objpfx)start.o
 114         rm -f $@
 115         ln $< $@
 116 endif
 117 endif
 118
 119 # The profiling startfile is made by linking together the normal
 120 # startfile with gmon-start.o, which defines a constructor function
 121 # to turn on profiling code at startup.
 122 $(objpfx)g$(start-installed-name): $(objpfx)$(start-installed-name) \
 123                                    $(objpfx)gmon-start.o
 124         $(link-relocatable)
 125
 126 # These extra files are sometimes expected by system standard linking
 127 # procedures, but we have nothing for them to do.  So compile empty files.
 128 $(addprefix $(objpfx),$(filter-out $(start-installed-name),$(csu-dummies))):
 129         cp /dev/null $(@:.o=.c)
 130         $(COMPILE.c) $(@:.o=.c) $(OUTPUT_OPTION)
 131         rm -f $(@:.o=.c)
 132
 133 / := $$/# bite me.
 134 $(objpfx)abi-tag.h: $(..)abi-tags
 135         $(make-target-directory)
 136         rm -f $@.new
 137         sed 's/#.*$//;/^[       ]*$$/d' $< | while read conf tag; do \
 138           test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
 139                      : "$$conf"` != 0 || continue; \
 140           echo "$$tag" | sed > $@.new \
 141                's/[^0-9xXa-fA-F]/ /g;s/ *$//;s/ /,/g;s/^ */#define ABI_TAG /';\
 142         done
 143         if test -r $@.new; then mv -f $@.new $@; \
 144         else echo >&2 'This configuration not matched in $<'; exit 1; fi