csu/Makefile

   1 # Makefile for csu code for GNU C library.
   2 # Copyright (C) 1995-2003, 2004 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            libc-tls elf-init dso_handle
  31 aux      = errno
  32 elide-routines.os = libc-tls
  33 static-only-routines = elf-init
  34 csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.o)
  35 extra-objs = start.o gmon-start.o \
  36              $(start-installed-name) g$(start-installed-name) $(csu-dummies) \
  37              S$(start-installed-name)
  38 omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
  39                              b$(start-installed-name) $(csu-dummies) \
  40                              S$(start-installed-name))
  41 install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
  42 distribute = initfini.c gmon-start.c start.c defs.awk munch.awk \
  43              abi-note.S init.c munch-tmpl.c not-cancel.h
  44 generated = version-info.h
  45 before-compile = $(objpfx)version-info.h
  46
  47 tests := tst-empty tst-atomic tst-atomic-long
  48 tests-static := tst-empty
  49
  50 all: # Make this the default target; it will be defined in Rules.
  51
  52 include ../Makeconfig
  53
  54 ifeq (yes,$(build-shared))
  55 extra-objs += S$(start-installed-name)
  56 install-lib += S$(start-installed-name)
  57 endif
  58
  59 ifeq (yes,$(build-bounded))
  60 extra-objs += b$(start-installed-name)
  61 install-lib += b$(start-installed-name)
  62 endif
  63
  64 ifneq ($(start-installed-name),$(static-start-installed-name))
  65 extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
  66 omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
  67                              g$(static-start-installed-name))
  68 install-lib += $(static-start-installed-name) g$(static-start-installed-name)
  69 endif
  70
  71 ifeq (yes,$(elf))
  72 before-compile += $(objpfx)abi-tag.h
  73 generated += abi-tag.h
  74 endif
  75
  76 ifneq (yes,$(gnu-ld))
  77 libc-init = munch-init
  78 $(objpfx)munch-init.c: munch.awk munch-tmpl.c $(+subdir_inits)
  79         $(AWK) -f $< subdirs='$(+init_subdirs)' $(word 2,$^) > $@-t
  80         mv -f $@-t $@
  81 generated += munch-init.c
  82
  83 # All initialization source files.
  84 +subdir_inits   := $(wildcard $(foreach dir,$(subdirs),$(dir)/init-$(dir).c))
  85 # All subdirectories containing initialization source files.
  86 +init_subdirs   := $(patsubst %/,%,$(dir $(+subdir_inits)))
  87 endif
  88
  89 ifeq ($(have-initfini),yes)
  90
  91 CPPFLAGS += -DHAVE_INITFINI
  92
  93 # These are the special initializer/finalizer files.  They are always the
  94 # first and last file in the link.  crti.o ... crtn.o define the global
  95 # "functions" _init and _fini to run the .init and .fini sections.
  96 crtstuff = crti crtn
  97
  98 install-lib += $(crtstuff:=.o)
  99 extra-objs += $(crtstuff:=.o)
 100 generated += $(crtstuff:=.S) initfini.s defs.h
 101 omit-deps += $(crtstuff)
 102
 103 # Special rules for the building of crti.o and crtn.o
 104 $(crtstuff:%=$(objpfx)%.o): %.o: %.S $(objpfx)defs.h
 105         $(compile.S) -g0 $(ASFLAGS-.os) -o $@
 106
 107 CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions $(fno-unit-at-a-time)
 108
 109 vpath initfini.c $(full_config_sysdirs)
 110
 111 $(objpfx)initfini.s: initfini.c $(before-compile)
 112         $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
 113                 $(patsubst -f%,-fno-%,$(exceptions)) -o $@
 114
 115 # We only have one kind of startup code files.  Static binaries and
 116 # shared libraries are build using the PIC version.
 117 $(objpfx)crti.S: $(objpfx)initfini.s
 118         sed -n -e '1,/@HEADER_ENDS/p' \
 119                -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
 120                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 121
 122 $(objpfx)crtn.S: $(objpfx)initfini.s
 123         sed -n -e '1,/@HEADER_ENDS/p' \
 124                -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
 125                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 126
 127 # These explicit rules are necessary when the $(objpfx) subdirectory
 128 # did not exist at the time make considered the implicit rules using it.
 129 # This comes up with a fresh build using no_deps=t.
 130 $(patsubst %,$(objpfx)crt%.o,i n): %.o: %.S
 131
 132 $(objpfx)defs.h: $(objpfx)initfini.s
 133         sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
 134                 $(AWK) -f defs.awk > $@
 135
 136 endif
 137
 138 ifeq (yes,$(elf))
 139 extra-objs += abi-note.o init.o
 140 asm-CPPFLAGS += -I$(objpfx).
 141 endif
 142
 143 include ../Rules
 144
 145 # Make these in the lib pass so they're available in time to link things with.
 146 subdir_lib: $(extra-objs:%=$(objpfx)%)
 147
 148 define link-relocatable
 149 $(CC) -nostdlib -nostartfiles -r -o $@ $^
 150 endef
 151
 152 ifndef start-installed-name-rule
 153 ifeq (yes,$(elf))
 154 # We link the ELF startfile along with a SHT_NOTE section indicating
 155 # the kernel ABI the binaries linked with this library will require.
 156 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
 157                                   $(objpfx)init.o
 158         $(link-relocatable)
 159 $(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \
 160                                   $(objpfx)init.o
 161         $(link-relocatable)
 162 $(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \
 163                                   $(objpfx)init.ob
 164         $(link-relocatable)
 165 else
 166 # The startfile is installed under different names, so we just call our
 167 # source file `start.c' and copy to the installed name after compiling.
 168 $(objpfx)$(start-installed-name): $(objpfx)start.o
 169         rm -f $@
 170         ln $< $@
 171 $(objpfx)S$(start-installed-name): $(objpfx)start.os
 172         rm -f $@
 173         ln $< $@
 174 $(objpfx)b$(start-installed-name): $(objpfx)start.ob
 175         rm -f $@
 176         ln $< $@
 177 endif
 178 endif
 179
 180 # The profiling startfile is made by linking together the normal
 181 # startfile with gmon-start.o, which defines a constructor function
 182 # to turn on profiling code at startup.
 183 $(addprefix $(objpfx),$(sort g$(start-installed-name) \
 184                              g$(static-start-installed-name))): \
 185   $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
 186         $(link-relocatable)
 187
 188 # These extra files are sometimes expected by system standard linking
 189 # procedures, but we have nothing for them to do.  So compile empty files.
 190 $(addprefix $(objpfx),$(filter-out $(start-installed-name), $(csu-dummies))):\
 191   $(before-compile)
 192         $(COMPILE.c) -o $@ -x c /dev/null
 193
 194 # These headers are used by the startup code.
 195 $(objpfx)abi-tag.h: $(..)abi-tags
 196         $(make-target-directory)
 197         rm -f $@.new
 198         sed -e 's/#.*$$//' -e '/^[      ]*$$/d' $< | \
 199         while read conf tagos tagver; do \
 200           test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
 201                      : "$$conf"` != 0 || continue; \
 202           ( echo "$$tagos" | \
 203             sed -e 's/[^0-9xXa-fA-F     ]//' \
 204                 -e 's/^/#define __ABI_TAG_OS /'; \
 205             echo "#ifndef __ABI_TAG_VERSION"; \
 206             echo "$$tagver" | \
 207             sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
 208               -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
 209             echo "#endif" ) > $@.new; \
 210         done
 211         if test -r $@.new; then mv -f $@.new $@; \
 212         else echo >&2 'This configuration not matched in $<'; exit 1; fi
 213
 214 all-Banner-files = $(wildcard $(addsuffix /Banner, \
 215                                         $(addprefix $(..), $(subdirs))))
 216 $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
 217         $(make-target-directory)
 218         (case $(config-os) in \
 219            linux*) version=`(printf '%s\n%s\n' \
 220                                     '#include <linux/version.h>' \
 221                                     UTS_RELEASE \
 222                              | $(CC) $(CPPFLAGS) -E -P - -DNOT_IN_libc=1 | \
 223                              sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
 224                    if [ -z "$$version" ]; then \
 225                      if [ -r /proc/version ]; then \
 226                        version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
 227                                 < /proc/version`; \
 228                      else \
 229                        version=`uname -r`; \
 230                      fi; \
 231                    fi; \
 232                    os=`uname -s 2> /dev/null`; \
 233                    if [ -z "$$os" ]; then \
 234                      os=Linux; \
 235                    fi; \
 236                    printf '"Compiled on a %s %s system on %s.\\n"\n' \
 237                           "$$os" "$$version" "`date +%Y-%m-%d`";; \
 238            *) ;; \
 239          esac; \
 240          files="$(all-Banner-files)";                           \
 241          if test -n "$$files"; then                             \
 242            echo "\"Available extensions:\\n\"";                 \
 243            sed -e '/^#/d' -e 's/^[[:space:]]*/  /'              \
 244                -e 's/^\(.*\)$$/\"\1\\n\"/' $$files;             \
 245          fi) > $@T
 246         mv -f $@T $@