csu/Makefile

   1 # Makefile for csu code for GNU C library.
   2 # Copyright (C) 1995-2004, 2005, 2006, 2010 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 \
  43              abi-note.S init.c 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 generated += start.os
  58 endif
  59
  60 ifeq (yes,$(build-bounded))
  61 extra-objs += b$(start-installed-name)
  62 install-lib += b$(start-installed-name)
  63 generated += start.ob
  64 endif
  65
  66 ifneq ($(start-installed-name),$(static-start-installed-name))
  67 extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
  68 omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
  69                              g$(static-start-installed-name))
  70 install-lib += $(static-start-installed-name) g$(static-start-installed-name)
  71 endif
  72
  73 ifeq (yes,$(elf))
  74 before-compile += $(objpfx)abi-tag.h
  75 generated += abi-tag.h
  76 endif
  77
  78 ifeq ($(have-initfini),yes)
  79
  80 CPPFLAGS += -DHAVE_INITFINI
  81
  82 # These are the special initializer/finalizer files.  They are always the
  83 # first and last file in the link.  crti.o ... crtn.o define the global
  84 # "functions" _init and _fini to run the .init and .fini sections.
  85 crtstuff = crti crtn
  86
  87 install-lib += $(crtstuff:=.o)
  88 extra-objs += $(crtstuff:=.o)
  89 generated += $(crtstuff:=.S) initfini.s defs.h
  90 omit-deps += $(crtstuff)
  91
  92 # Special rules for the building of crti.o and crtn.o
  93 $(crtstuff:%=$(objpfx)%.o): %.o: %.S $(objpfx)defs.h
  94         $(compile.S) -g0 $(ASFLAGS-.os) -o $@
  95
  96 CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions $(fno-unit-at-a-time) \
  97                     -fno-asynchronous-unwind-tables
  98
  99 vpath initfini.c $(sysdirs)
 100
 101 $(objpfx)initfini.s: initfini.c $(before-compile)
 102         $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
 103                 $(patsubst -f%,-fno-%,$(exceptions)) -o $@
 104
 105 # We only have one kind of startup code files.  Static binaries and
 106 # shared libraries are build using the PIC version.
 107 $(objpfx)crti.S: $(objpfx)initfini.s
 108         sed -n -e '1,/@HEADER_ENDS/p' \
 109                -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
 110                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 111
 112 $(objpfx)crtn.S: $(objpfx)initfini.s
 113         sed -n -e '1,/@HEADER_ENDS/p' \
 114                -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
 115                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 116
 117 # These explicit rules are necessary when the $(objpfx) subdirectory
 118 # did not exist at the time make considered the implicit rules using it.
 119 # This comes up with a fresh build using no_deps=t.
 120 $(patsubst %,$(objpfx)crt%.o,i n): %.o: %.S
 121
 122 $(objpfx)defs.h: $(objpfx)initfini.s
 123         sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
 124                 $(AWK) -f defs.awk > $@
 125
 126 endif
 127
 128 ifeq (yes,$(elf))
 129 extra-objs += abi-note.o init.o
 130 asm-CPPFLAGS += -I$(objpfx).
 131 endif
 132
 133 include ../Rules
 134
 135 # Make these in the lib pass so they're available in time to link things with.
 136 subdir_lib: $(extra-objs:%=$(objpfx)%)
 137
 138 define link-relocatable
 139 $(CC) -nostdlib -nostartfiles -r -o $@ $^
 140 endef
 141
 142 ifndef start-installed-name-rule
 143 ifeq (yes,$(elf))
 144 # We link the ELF startfile along with a SHT_NOTE section indicating
 145 # the kernel ABI the binaries linked with this library will require.
 146 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
 147                                   $(objpfx)init.o
 148         $(link-relocatable)
 149 $(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \
 150                                   $(objpfx)init.o
 151         $(link-relocatable)
 152 $(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \
 153                                   $(objpfx)init.ob
 154         $(link-relocatable)
 155 else
 156 # The startfile is installed under different names, so we just call our
 157 # source file `start.c' and copy to the installed name after compiling.
 158 $(objpfx)$(start-installed-name): $(objpfx)start.o
 159         rm -f $@
 160         ln $< $@
 161 $(objpfx)S$(start-installed-name): $(objpfx)start.os
 162         rm -f $@
 163         ln $< $@
 164 $(objpfx)b$(start-installed-name): $(objpfx)start.ob
 165         rm -f $@
 166         ln $< $@
 167 endif
 168 endif
 169
 170 # The profiling startfile is made by linking together the normal
 171 # startfile with gmon-start.o, which defines a constructor function
 172 # to turn on profiling code at startup.
 173 $(addprefix $(objpfx),$(sort g$(start-installed-name) \
 174                              g$(static-start-installed-name))): \
 175   $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
 176         $(link-relocatable)
 177
 178 # These extra files are sometimes expected by system standard linking
 179 # procedures, but we have nothing for them to do.  So compile empty files.
 180 $(addprefix $(objpfx),$(filter-out $(start-installed-name), $(csu-dummies))):\
 181   $(before-compile)
 182         $(COMPILE.c) -o $@ -x c /dev/null
 183
 184 # These headers are used by the startup code.
 185 $(objpfx)abi-tag.h: $(..)abi-tags
 186         $(make-target-directory)
 187         rm -f $@.new
 188         sed -e 's/#.*$$//' -e '/^[      ]*$$/d' $< | \
 189         while read conf tagos tagver; do \
 190           test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
 191                      : "$$conf"` != 0 || continue; \
 192           ( echo "$$tagos" | \
 193             sed -e 's/[^0-9xXa-fA-F     ]//' \
 194                 -e 's/^/#define __ABI_TAG_OS /'; \
 195             echo "#ifndef __ABI_TAG_VERSION"; \
 196             echo "$$tagver" | \
 197             sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
 198               -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
 199             echo "#endif" ) > $@.new; \
 200         done
 201         if test -r $@.new; then mv -f $@.new $@; \
 202         else echo >&2 'This configuration not matched in $<'; exit 1; fi
 203
 204 all-Banner-files = $(wildcard $(addsuffix /Banner,\
 205                                           $(sort $(subdir-srcdirs) \
 206                                                  $(sysdeps-srcdirs))))
 207 $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
 208         $(make-target-directory)
 209         (case $(config-os) in \
 210            linux*) version=`(printf '%s\n%s\n' \
 211                                     '#include <linux/version.h>' \
 212                                     UTS_RELEASE \
 213                              | $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 | \
 214                              sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
 215                    if [ -z "$$version" ]; then \
 216                      version=`(printf '%s\n%s\n' \
 217                                       '#include <linux/version.h>' \
 218                                        LINUX_VERSION_CODE \
 219                                | $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 \
 220                                | sed -n -e '/^[123456789].*/p' \
 221                                | awk '{v=$$1; \
 222                                        printf("%d.%d.%d\n", \
 223                                               v/65535, v/256%256, v%256)}') \
 224                                 2>/dev/null`; \
 225                    fi; \
 226                    if [ -z "$$version" ]; then \
 227                      if [ -r /proc/version ]; then \
 228                        version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
 229                                 < /proc/version`; \
 230                      else \
 231                        version=`uname -r`; \
 232                      fi; \
 233                    fi; \
 234                    os=`uname -s 2> /dev/null`; \
 235                    if [ -z "$$os" ]; then \
 236                      os=Linux; \
 237                    fi; \
 238                    printf '"Compiled on a %s %s system on %s.\\n"\n' \
 239                           "$$os" "$$version" "`date +%Y-%m-%d`";; \
 240            *) ;; \
 241          esac; \
 242          files="$(all-Banner-files)";                           \
 243          if test -n "$$files"; then                             \
 244            printf '"Available extensions:\\n"\n';               \
 245            sed -e '/^#/d' -e 's/^[[:space:]]*/  /'              \
 246                -e 's/^\(.*\)$$/\"\1\\n\"/' $$files;             \
 247          fi) > $@T
 248         mv -f $@T $@