csu/Makefile

   1 # Makefile for csu code for GNU C library.
   2 # Copyright (C) 1995,96,97,98,99,2000,01 Free Software Foundation, Inc.
   3 # This file is part of the GNU C Library.
   4
   5 # The GNU C Library is free software; you can redistribute it and/or
   6 # modify it under the terms of the GNU Lesser General Public
   7 # License as published by the Free Software Foundation; either
   8 # version 2.1 of the License, or (at your option) any later version.
   9
  10 # The GNU C Library is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 # Lesser General Public License for more details.
  14
  15 # You should have received a copy of the GNU Lesser General Public
  16 # License along with the GNU C Library; if not, write to the Free
  17 # Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18 # 02111-1307 USA.
  19
  20 # This directory contains the C startup code (that which calls main).  This
  21 # consists of the startfile, built from start.c and installed as crt0.o
  22 # (traditionally) or crt1.o (for ELF).  In ELF we also install crti.o and
  23 # crtn.o, special "initializer" and "finalizer" files used in the link
  24 # to make the .init and .fini sections work right; both these files are
  25 # built (in an arcane manner) from initfini.c.
  26
  27 subdir := csu
  28
  29 routines = init-first libc-start $(libc-init) sysdep version check_fds
  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) $(csu-dummies)
  33 omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
  34                               b$(start-installed-name) $(csu-dummies))
  35 install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
  36 distribute = initfini.c gmon-start.c start.c defs.awk munch.awk \
  37              abi-note.S init.c munch-tmpl.c
  38 generated = version-info.h
  39 before-compile = $(objpfx)version-info.h
  40
  41 all: # Make this the default target; it will be defined in Rules.
  42
  43 include ../Makeconfig
  44
  45 ifeq (yes,$(build-bounded))
  46 extra-objs += b$(start-installed-name)
  47 install-lib += b$(start-installed-name)
  48 endif
  49
  50 ifneq ($(start-installed-name),$(static-start-installed-name))
  51 extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
  52 omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
  53                              g$(static-start-installed-name))
  54 install-lib += $(static-start-installed-name) g$(static-start-installed-name)
  55 endif
  56
  57 ifeq (yes,$(elf))
  58 before-compile += $(objpfx)abi-tag.h
  59 generated += abi-tag.h
  60 endif
  61
  62 ifneq (yes,$(gnu-ld))
  63 libc-init = munch-init
  64 $(objpfx)munch-init.c: munch.awk munch-tmpl.c $(+subdir_inits)
  65         $(AWK) -f $< subdirs='$(+init_subdirs)' $(word 2,$^) > $@-t
  66         mv -f $@-t $@
  67 generated += munch-init.c
  68
  69 # All initialization source files.
  70 +subdir_inits   := $(wildcard $(foreach dir,$(subdirs),$(dir)/init-$(dir).c))
  71 # All subdirectories containing initialization source files.
  72 +init_subdirs   := $(patsubst %/,%,$(dir $(+subdir_inits)))
  73 endif
  74
  75 ifeq ($(have-initfini),yes)
  76
  77 CPPFLAGS += -DHAVE_INITFINI
  78
  79 # These are the special initializer/finalizer files.  They are always the
  80 # first and last file in the link.  crti.o ... crtn.o define the global
  81 # "functions" _init and _fini to run the .init and .fini sections.
  82 crtstuff = crti crtn
  83
  84 install-lib += $(crtstuff:=.o)
  85 extra-objs += $(crtstuff:=.o)
  86 generated += $(crtstuff:=.S) initfini.s defs.h
  87 omit-deps += $(crtstuff)
  88
  89 # Special rules for the building of crti.o and crtn.o
  90 $(objpfx)crt%.o: $(objpfx)crt%.S $(objpfx)defs.h
  91         $(compile.S) -g0 $(ASFLAGS-.os) -o $@
  92
  93 CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions
  94
  95 vpath initfini.c $(full_config_sysdirs)
  96
  97 $(objpfx)initfini.s: initfini.c
  98         $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
  99                 $(patsubst -f%,-fno-%,$(exceptions)) -o $@
 100
 101 # We only have one kind of startup code files.  Static binaries and
 102 # shared libraries are build using the PIC version.
 103 $(objpfx)crti.S: $(objpfx)initfini.s
 104         sed -n -e '1,/@HEADER_ENDS/p' \
 105                -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
 106                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 107
 108 $(objpfx)crtn.S: $(objpfx)initfini.s
 109         sed -n -e '1,/@HEADER_ENDS/p' \
 110                -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
 111                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 112
 113 $(objpfx)defs.h: $(objpfx)initfini.s
 114         sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
 115                 $(AWK) -f defs.awk > $@
 116
 117 endif
 118
 119 ifeq (yes,$(elf))
 120 extra-objs += abi-note.o init.o
 121 asm-CPPFLAGS += -I$(objpfx).
 122 endif
 123
 124 include ../Rules
 125
 126 # Make these in the lib pass so they're available in time to link things with.
 127 subdir_lib: $(extra-objs:%=$(objpfx)%)
 128
 129 define link-relocatable
 130 $(CC) -nostdlib -nostartfiles -r -o $@ $^
 131 endef
 132
 133 ifndef start-installed-name-rule
 134 ifeq (yes,$(elf))
 135 # We link the ELF startfile along with a SHT_NOTE section indicating
 136 # the kernel ABI the binaries linked with this library will require.
 137 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
 138                                   $(objpfx)init.o
 139         $(link-relocatable)
 140 $(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \
 141                                   $(objpfx)init.ob
 142         $(link-relocatable)
 143 else
 144 # The startfile is installed under different names, so we just call our
 145 # source file `start.c' and copy to the installed name after compiling.
 146 $(objpfx)$(start-installed-name): $(objpfx)start.o
 147         rm -f $@
 148         ln $< $@
 149 $(objpfx)b$(start-installed-name): $(objpfx)start.ob
 150         rm -f $@
 151         ln $< $@
 152 endif
 153 endif
 154
 155 # The profiling startfile is made by linking together the normal
 156 # startfile with gmon-start.o, which defines a constructor function
 157 # to turn on profiling code at startup.
 158 $(addprefix $(objpfx),$(sort g$(start-installed-name) \
 159                              g$(static-start-installed-name))): \
 160   $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
 161         $(link-relocatable)
 162
 163 # These extra files are sometimes expected by system standard linking
 164 # procedures, but we have nothing for them to do.  So compile empty files.
 165 $(addprefix $(objpfx),$(filter-out $(start-installed-name),$(csu-dummies))):
 166         @-rm -f $(@:.o=.c)
 167         echo > $(@:.o=.c)
 168         $(COMPILE.c) $(@:.o=.c) $(OUTPUT_OPTION)
 169         rm -f $(@:.o=.c)
 170
 171 # These headers are used by the startup code.
 172 $(objpfx)abi-tag.h: $(..)abi-tags
 173         $(make-target-directory)
 174         rm -f $@.new
 175         sed -e 's/#.*$$//' -e '/^[      ]*$$/d' $< | \
 176         while read conf tagos tagver; do \
 177           test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
 178                      : "$$conf"` != 0 || continue; \
 179           ( echo "$$tagos" | \
 180             sed -e 's/[^0-9xXa-fA-F     ]//' \
 181                 -e 's/^/#define __ABI_TAG_OS /'; \
 182             echo "#ifndef __ABI_TAG_VERSION"; \
 183             echo "$$tagver" | \
 184             sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
 185               -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
 186             echo "#endif" ) > $@.new; \
 187         done
 188         if test -r $@.new; then mv -f $@.new $@; \
 189         else echo >&2 'This configuration not matched in $<'; exit 1; fi
 190
 191 all-Banner-files = $(wildcard $(addsuffix /Banner, \
 192                                         $(addprefix $(..), $(subdirs))))
 193 $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
 194         $(make-target-directory)
 195         (case $(config-os) in \
 196            linux*) version=`(echo -e "#include <linux/version.h>\nUTS_RELEASE"\
 197                              | $(CC) -E -P - | \
 198                              sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
 199                    if [ -z "$$version" ]; then \
 200                      if [ -r /proc/version ]; then \
 201                        version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
 202                                 < /proc/version`; \
 203                      else \
 204                        version=`uname -r`; \
 205                      fi; \
 206                    fi; \
 207                    os=`uname -s 2> /dev/null`; \
 208                    if [ -z "$$os" ]; then \
 209                      os=Linux; \
 210                    fi; \
 211                    echo "\"Compiled on a $$os $$version system" \
 212                         "on `date +%Y-%m-%d`.\\n\"" ;; \
 213            *) ;; \
 214          esac; \
 215          files="$(all-Banner-files)";                           \
 216          if test -n "$$files"; then                             \
 217            echo "\"Available extensions:\\n\"";                 \
 218            sed -e '/^#/d' -e 's/^[[:space:]]*/  /'              \
 219                -e 's/\(^.*$$\)/\"\1\\n\"/' $$files;             \
 220          fi) > $@T
 221         mv -f $@T $@