csu/Makefile

   1 # Makefile for csu code for 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
   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
  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               $(csu-dummies)
  39 distribute = initfini.c gmon-start.c start.c defs.awk abi-note.S abi-tag.h
  40
  41 all: # Make this the default target; it will be defined in Rules.
  42
  43 include ../Makeconfig
  44
  45
  46 ifeq ($(have-initfini),yes)
  47
  48 CPPFLAGS += -DHAVE_INITFINI
  49
  50 # These are the special initializer/finalizer files.  They are always the
  51 # first and last file in the link.  crti.o ... crtn.o define the global
  52 # "functions" _init and _fini to run the .init and .fini sections.
  53 crtstuff = crti crtn
  54
  55 install-lib += $(crtstuff:=.o)
  56 extra-objs += $(crtstuff:=.o)
  57 generated += $(crtstuff:=.S) initfini.s align.h end.h
  58 omit-deps += $(crtstuff)
  59
  60 # Special rules for the building of crti.o and crtn.o
  61 $(objpfx)crt%.o: $(objpfx)crt%.S $(objpfx)defs.h
  62         $(CC) -c -fPIC -g0 -I$(..) -I$(common-objpfx) -DASSEMBLER $< -o $@
  63
  64 $(objpfx)initfini.s: initfini.c
  65         $(CC) $(CPPFLAGS) $(CFLAGS) -g0 -S -fPIC -finhibit-size-directive \
  66               $(no-exceptions) $< -o $@
  67
  68 $(objpfx)crti.S: $(objpfx)initfini.s
  69         sed -n -e '1,/@HEADER_ENDS/p' \
  70                -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
  71                -e '/@TRAILER_BEGINS/,$$p' $< > $@
  72
  73 $(objpfx)crtn.S: $(objpfx)initfini.s
  74         sed -n -e '1,/@HEADER_ENDS/p' \
  75                -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
  76                -e '/@TRAILER_BEGINS/,$$p' $< > $@
  77
  78 $(objpfx)defs.h: $(objpfx)initfini.s
  79         sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
  80                 awk -f defs.awk > $@
  81
  82 endif
  83
  84 include ../Rules
  85
  86 define link-relocatable
  87 $(CC) -nostdlib -nostartfiles -r -o $@ $^
  88 endef
  89
  90 ifndef start-installed-name-rule
  91 ifeq (yes,$(elf))
  92 # We link the ELF startfile along with a SHT_NOTE section indicating
  93 # the the kernel ABI the binaries linked with this library will require.
  94 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o
  95         $(link-relocatable)
  96 else
  97 # The startfile is installed under different names, so we just call our
  98 # source file `start.c' and copy to the installed name after compiling.
  99 $(objpfx)$(start-installed-name): $(objpfx)start.o
 100         rm -f $@
 101         ln $< $@
 102 endif
 103 endif
 104
 105 # The profiling startfile is made by linking together the normal
 106 # startfile with gmon-start.o, which defines a constructor function
 107 # to turn on profiling code at startup.
 108 $(objpfx)g$(start-installed-name): $(objpfx)$(start-installed-name) \
 109                                    $(objpfx)gmon-start.o
 110         $(link-relocatable)
 111
 112 # These extra files are sometimes expected by system standard linking
 113 # procedures, but we have nothing for them to do.  So compile empty files.
 114 $(addprefix $(objpfx),$(filter-out $(start-installed-name),$(csu-dummies))):
 115         cp /dev/null $(@:.o=.c)
 116         $(COMPILE.c) $(@:.o=.c) $(OUTPUT_OPTION)
 117         rm -f $(@:.o=.c)