csu/Makefile

   1 # Makefile for csu code for GNU C library.
   2
   3 # Copyright (C) 1995, 1996 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
  18 # not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  19 # Cambridge, MA 02139, 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 csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.o)
  31 extra-objs = start.o gmon-start.o \
  32              $(start-installed-name) g$(start-installed-name) \
  33              $(csu-dummies)
  34 omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
  35                              $(csu-dummies))
  36 install-lib = $(start-installed-name) g$(start-installed-name) \
  37               $(csu-dummies)
  38 distribute = initfini.c
  39
  40 all: # Make this the default target; it will be defined in Rules.
  41
  42 include ../Makeconfig
  43
  44 ifneq ($(elf),yes)
  45
  46 # When not using ELF, there is just one startfile, called crt0.o.
  47 start-installed-name = crt0.o
  48
  49 else
  50
  51 # In the ELF universe, crt0.o is called crt1.o, and there are
  52 # some additional bizarre files.
  53 start-installed-name = crt1.o
  54 have-initfini = yes
  55
  56 endif
  57
  58 ifeq (yes,$(have-initfini))
  59
  60 CPPFLAGS += -DHAVE_INITFINI
  61
  62 # These are the special initializer/finalizer files.  They are always the
  63 # first and last file in the link.  crti.o ... crtn.o define the global
  64 # "functions" _init and _fini to run the .init and .fini sections.
  65 crtstuff = crti crtn
  66
  67 install-lib += $(crtstuff:=.o)
  68 extra-objs += $(crtstuff:=.o)
  69 generated += $(crtstuff:=.s)
  70 omit-deps += $(crtstuff)
  71
  72 # Compile initfini.c to assembly code, which contains embedded shell
  73 # commands that prodice crti.s-new and crtn.s-new when run.  We need to
  74 # disable emission of .size directives and debugging information, since
  75 # they will get confused by the splitting of the output we do.
  76 $(objpfx)cr%i.s $(objpfx)cr%n.s: initfini.c; $(initfini)
  77
  78 define initfini
  79 -rm -f $(objpfx)crtcommon.tmp
  80 (echo 'cat > crtcommon.tmp <<\EOF_common'; \
  81  $(CC) $< $(CPPFLAGS) $(CFLAGS) \
  82        -fPIC -finhibit-size-directive -g0 -S -o -; \
  83  echo 'EOF_common') | (cd $(@D); $(SHELL))
  84 cat $(objpfx)crtcommon.tmp >> $(objpfx)crti.s-new
  85 cat $(objpfx)crtcommon.tmp >> $(objpfx)crtn.s-new
  86 rm -f $(objpfx)crtcommon.tmp
  87 mv -f $(objpfx)crti.s-new $(subst crtn,crti,$@)
  88 mv -f $(objpfx)crtn.s-new $(subst crti,crtn,$@)
  89 endef
  90
  91 endif
  92
  93 include ../Rules
  94
  95 ifndef start-installed-name-rule
  96 # The startfile is installed under different names, so we just call our
  97 # source file `start.c' and copy to the installed name after compiling.
  98 $(objpfx)$(start-installed-name): $(objpfx)start.o
  99         -rm -f $@
 100         ln $< $@
 101 endif
 102
 103 # The profiling startfile is made by linking together the normal
 104 # startfile with gmon-start.o, which defines a constructor function
 105 # to turn on profiling code at startup.
 106 $(objpfx)g$(start-installed-name): $(objpfx)start.o $(objpfx)gmon-start.o
 107         $(CC) -nostdlib -nostartfiles -r -o $@ $^
 108
 109 # These extra files are sometimes expected by system standard linking
 110 # procedures, but we have nothing for them to do.  So compile empty files.
 111 $(addprefix $(objpfx),$(filter-out $(start-installed-name),$(csu-dummies))):
 112         cp /dev/null $(@:.o=.c)
 113         $(COMPILE.c) $(@:.o=.c) $(OUTPUT_OPTION)
 114         rm -f $(@:.o=.c)
 115