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 $(libc-init) sysdep version
  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 munch.awk \
  40              abi-note.S init.c munch-tmpl.c
  41 generated = version-info.h
  42 before-compile = $(objpfx)version-info.h
  43
  44 all: # Make this the default target; it will be defined in Rules.
  45
  46 include ../Makeconfig
  47
  48 ifeq (yes,$(elf))
  49 before-compile += $(objpfx)abi-tag.h
  50 generated += abi-tag.h
  51 endif
  52
  53 ifeq (yes,$(gnu-ld))
  54 libc-init = set-init
  55 else
  56 libc-init = munch-init
  57 $(objpfx)munch-init.c: munch.awk munch-tmpl.c $(+subdir_inits)
  58         $(AWK) -f $< subdirs='$(+init_subdirs)' $(word 2,$^) > $@-t
  59         mv -f $@-t $@
  60 generated += munch-init.c
  61
  62 # All initialization source files.
  63 +subdir_inits   := $(wildcard $(foreach dir,$(subdirs),$(dir)/init-$(dir).c))
  64 # All subdirectories containing initialization source files.
  65 +init_subdirs   := $(patsubst %/,%,$(dir $(+subdir_inits)))
  66 endif
  67
  68 ifeq ($(have-initfini),yes)
  69
  70 CPPFLAGS += -DHAVE_INITFINI
  71
  72 # These are the special initializer/finalizer files.  They are always the
  73 # first and last file in the link.  crti.o ... crtn.o define the global
  74 # "functions" _init and _fini to run the .init and .fini sections.
  75 crtstuff = crti crtn
  76
  77 install-lib += $(crtstuff:=.o)
  78 extra-objs += $(crtstuff:=.o)
  79 generated += $(crtstuff:=.S) initfini.s defs.h
  80 omit-deps += $(crtstuff)
  81
  82 # Special rules for the building of crti.o and crtn.o
  83 $(objpfx)crt%.o: $(objpfx)crt%.S $(objpfx)defs.h
  84         $(compile.S) -g0 $(ASFLAGS-.os) -o $@
  85
  86 CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions
  87
  88 $(objpfx)initfini.s: initfini.c
  89         $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
  90                 $(no-exceptions) -o $@
  91
  92 # We only have one kind of startup code files.  Static binaries and
  93 # shared libraries are build using the PIC version.
  94 $(objpfx)crti.S: $(objpfx)initfini.s
  95         sed -n -e '1,/@HEADER_ENDS/p' \
  96                -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
  97                -e '/@TRAILER_BEGINS/,$$p' $< > $@
  98
  99 $(objpfx)crtn.S: $(objpfx)initfini.s
 100         sed -n -e '1,/@HEADER_ENDS/p' \
 101                -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
 102                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 103
 104 $(objpfx)defs.h: $(objpfx)initfini.s
 105         sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
 106                 $(AWK) -f defs.awk > $@
 107
 108 endif
 109
 110 ifeq (yes,$(elf))
 111 extra-objs += abi-note.o init.o
 112 asm-CPPFLAGS += -I$(objpfx).
 113 endif
 114
 115 include ../Rules
 116
 117 # Make these in the lib pass so they're available in time to link things with.
 118 subdir_lib: $(extra-objs:%=$(objpfx)%)
 119
 120 define link-relocatable
 121 $(CC) -nostdlib -nostartfiles -r -o $@ $^
 122 endef
 123
 124 ifndef start-installed-name-rule
 125 ifeq (yes,$(elf))
 126 # We link the ELF startfile along with a SHT_NOTE section indicating
 127 # the kernel ABI the binaries linked with this library will require.
 128 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
 129                                   $(objpfx)init.o
 130         $(link-relocatable)
 131 else
 132 # The startfile is installed under different names, so we just call our
 133 # source file `start.c' and copy to the installed name after compiling.
 134 $(objpfx)$(start-installed-name): $(objpfx)start.o
 135         rm -f $@
 136         ln $< $@
 137 endif
 138 endif
 139
 140 # The profiling startfile is made by linking together the normal
 141 # startfile with gmon-start.o, which defines a constructor function
 142 # to turn on profiling code at startup.
 143 $(objpfx)g$(start-installed-name): $(objpfx)$(start-installed-name) \
 144                                    $(objpfx)gmon-start.o
 145         $(link-relocatable)
 146
 147 # These extra files are sometimes expected by system standard linking
 148 # procedures, but we have nothing for them to do.  So compile empty files.
 149 $(addprefix $(objpfx),$(filter-out $(start-installed-name),$(csu-dummies))):
 150         cp /dev/null $(@:.o=.c)
 151         $(COMPILE.c) $(@:.o=.c) $(OUTPUT_OPTION)
 152         rm -f $(@:.o=.c)
 153
 154 # These headers are used by the startup code.
 155 $(objpfx)abi-tag.h: $(..)abi-tags
 156         $(make-target-directory)
 157         rm -f $@.new
 158         sed -e 's/#.*$$//' -e '/^[      ]*$$/d' $< | \
 159         while read conf tag; do \
 160           test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
 161                      : "$$conf"` != 0 || continue; \
 162           echo "$$tag" | \
 163           sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
 164               -e 's/ /,/g' -e 's/^ */#define ABI_TAG /' > $@.new; \
 165         done
 166         if test -r $@.new; then mv -f $@.new $@; \
 167         else echo >&2 'This configuration not matched in $<'; exit 1; fi
 168
 169 all-Banner-files = $(wildcard $(addsuffix /Banner, \
 170                                         $(addprefix $(..), $(subdirs))))
 171 $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
 172         $(make-target-directory)
 173         (case $(config-os) in \
 174            linux*) version=`(echo -e "#include <linux/version.h>\nUTS_RELEASE"\
 175                              | $(CC) -E -P - | \
 176                              sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
 177                    if [ -z "$$version" ]; then \
 178                      if [ -r /proc/version ]; then \
 179                        version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
 180                                 < /proc/version`; \
 181                      else \
 182                        version=`uname -r`; \
 183                      fi; \
 184                    fi; \
 185                    echo -n "\"Compiled on a Linux $$version system "; \
 186                    echo "on `date +%Y-%m-%d`.\\n\"" ;; \
 187            *) ;; \
 188          esac; \
 189          files="$(all-Banner-files)";                           \
 190          if test -n "$$files"; then                             \
 191            echo "\"Available extensions:";                      \
 192            sed -e '/^#/d' -e 's/^[[:space:]]*/  /' $$files;     \
 193            echo "\"";                                           \
 194          fi) > $@T
 195         mv -f $@T $@