csu/Makefile

   1 # Makefile for csu code for GNU C library.
   2 # Copyright (C) 1995,96,97,98,99,2000,01,02,2003 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 omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
  38                               b$(start-installed-name) $(csu-dummies))
  39 install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
  40 distribute = initfini.c gmon-start.c start.c defs.awk munch.awk \
  41              abi-note.S init.c munch-tmpl.c
  42 generated = version-info.h
  43 before-compile = $(objpfx)version-info.h
  44
  45 tests := tst-atomic tst-atomic-long
  46
  47 all: # Make this the default target; it will be defined in Rules.
  48
  49 include ../Makeconfig
  50
  51 ifeq (yes,$(build-bounded))
  52 extra-objs += b$(start-installed-name)
  53 install-lib += b$(start-installed-name)
  54 endif
  55
  56 ifneq ($(start-installed-name),$(static-start-installed-name))
  57 extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
  58 omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
  59                              g$(static-start-installed-name))
  60 install-lib += $(static-start-installed-name) g$(static-start-installed-name)
  61 endif
  62
  63 ifeq (yes,$(elf))
  64 before-compile += $(objpfx)abi-tag.h
  65 generated += abi-tag.h
  66 endif
  67
  68 ifneq (yes,$(gnu-ld))
  69 libc-init = munch-init
  70 $(objpfx)munch-init.c: munch.awk munch-tmpl.c $(+subdir_inits)
  71         $(AWK) -f $< subdirs='$(+init_subdirs)' $(word 2,$^) > $@-t
  72         mv -f $@-t $@
  73 generated += munch-init.c
  74
  75 # All initialization source files.
  76 +subdir_inits   := $(wildcard $(foreach dir,$(subdirs),$(dir)/init-$(dir).c))
  77 # All subdirectories containing initialization source files.
  78 +init_subdirs   := $(patsubst %/,%,$(dir $(+subdir_inits)))
  79 endif
  80
  81 ifeq ($(have-initfini),yes)
  82
  83 CPPFLAGS += -DHAVE_INITFINI
  84
  85 # We don't want this compiled with PIC.
  86 # It's never included in shared libraries, unlike the rest of libc_nonshared.a.
  87 CPPFLAGS-elf-init.oS = $(patsubst %,-UPIC,$(pic-ccflag))
  88 CFLAGS-elf-init.oS = $(patsubst -f%,-fno-%,$(pic-ccflag))
  89
  90 # These are the special initializer/finalizer files.  They are always the
  91 # first and last file in the link.  crti.o ... crtn.o define the global
  92 # "functions" _init and _fini to run the .init and .fini sections.
  93 crtstuff = crti crtn
  94
  95 install-lib += $(crtstuff:=.o)
  96 extra-objs += $(crtstuff:=.o)
  97 generated += $(crtstuff:=.S) initfini.s defs.h
  98 omit-deps += $(crtstuff)
  99
 100 # Special rules for the building of crti.o and crtn.o
 101 $(objpfx)crt%.o: $(objpfx)crt%.S $(objpfx)defs.h
 102         $(compile.S) -g0 $(ASFLAGS-.os) -o $@
 103
 104 CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions
 105
 106 vpath initfini.c $(full_config_sysdirs)
 107
 108 $(objpfx)initfini.s: initfini.c
 109         $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
 110                 $(patsubst -f%,-fno-%,$(exceptions)) -o $@
 111
 112 # We only have one kind of startup code files.  Static binaries and
 113 # shared libraries are build using the PIC version.
 114 $(objpfx)crti.S: $(objpfx)initfini.s
 115         sed -n -e '1,/@HEADER_ENDS/p' \
 116                -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
 117                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 118
 119 $(objpfx)crtn.S: $(objpfx)initfini.s
 120         sed -n -e '1,/@HEADER_ENDS/p' \
 121                -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
 122                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 123
 124 # These explicit rules are necessary when the $(objpfx) subdirectory
 125 # did not exist at the time make considered the implicit rules using it.
 126 # This comes up with a fresh build using no_deps=t.
 127 $(patsubst %,$(objpfx)crt%.o,i n): %.o: %.S
 128
 129 $(objpfx)defs.h: $(objpfx)initfini.s
 130         sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
 131                 $(AWK) -f defs.awk > $@
 132
 133 endif
 134
 135 ifeq (yes,$(elf))
 136 extra-objs += abi-note.o init.o
 137 asm-CPPFLAGS += -I$(objpfx).
 138 endif
 139
 140 include ../Rules
 141
 142 # Make these in the lib pass so they're available in time to link things with.
 143 subdir_lib: $(extra-objs:%=$(objpfx)%)
 144
 145 define link-relocatable
 146 $(CC) -nostdlib -nostartfiles -r -o $@ $^
 147 endef
 148
 149 ifndef start-installed-name-rule
 150 ifeq (yes,$(elf))
 151 # We link the ELF startfile along with a SHT_NOTE section indicating
 152 # the kernel ABI the binaries linked with this library will require.
 153 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
 154                                   $(objpfx)init.o
 155         $(link-relocatable)
 156 $(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \
 157                                   $(objpfx)init.ob
 158         $(link-relocatable)
 159 else
 160 # The startfile is installed under different names, so we just call our
 161 # source file `start.c' and copy to the installed name after compiling.
 162 $(objpfx)$(start-installed-name): $(objpfx)start.o
 163         rm -f $@
 164         ln $< $@
 165 $(objpfx)b$(start-installed-name): $(objpfx)start.ob
 166         rm -f $@
 167         ln $< $@
 168 endif
 169 endif
 170
 171 # The profiling startfile is made by linking together the normal
 172 # startfile with gmon-start.o, which defines a constructor function
 173 # to turn on profiling code at startup.
 174 $(addprefix $(objpfx),$(sort g$(start-installed-name) \
 175                              g$(static-start-installed-name))): \
 176   $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
 177         $(link-relocatable)
 178
 179 # These extra files are sometimes expected by system standard linking
 180 # procedures, but we have nothing for them to do.  So compile empty files.
 181 $(addprefix $(objpfx),$(filter-out $(start-installed-name),$(csu-dummies))):
 182         @-rm -f $(@:.o=.c)
 183         echo > $(@:.o=.c)
 184         $(COMPILE.c) $(@:.o=.c) $(OUTPUT_OPTION)
 185         rm -f $(@:.o=.c)
 186
 187 # These headers are used by the startup code.
 188 $(objpfx)abi-tag.h: $(..)abi-tags
 189         $(make-target-directory)
 190         rm -f $@.new
 191         sed -e 's/#.*$$//' -e '/^[      ]*$$/d' $< | \
 192         while read conf tagos tagver; do \
 193           test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
 194                      : "$$conf"` != 0 || continue; \
 195           ( echo "$$tagos" | \
 196             sed -e 's/[^0-9xXa-fA-F     ]//' \
 197                 -e 's/^/#define __ABI_TAG_OS /'; \
 198             echo "#ifndef __ABI_TAG_VERSION"; \
 199             echo "$$tagver" | \
 200             sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
 201               -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
 202             echo "#endif" ) > $@.new; \
 203         done
 204         if test -r $@.new; then mv -f $@.new $@; \
 205         else echo >&2 'This configuration not matched in $<'; exit 1; fi
 206
 207 all-Banner-files = $(wildcard $(addsuffix /Banner, \
 208                                         $(addprefix $(..), $(subdirs))))
 209 $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
 210         $(make-target-directory)
 211         (case $(config-os) in \
 212            linux*) version=`(echo -e "#include <linux/version.h>\nUTS_RELEASE"\
 213                              | $(CC) -E -P - | \
 214                              sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
 215                    if [ -z "$$version" ]; then \
 216                      if [ -r /proc/version ]; then \
 217                        version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
 218                                 < /proc/version`; \
 219                      else \
 220                        version=`uname -r`; \
 221                      fi; \
 222                    fi; \
 223                    os=`uname -s 2> /dev/null`; \
 224                    if [ -z "$$os" ]; then \
 225                      os=Linux; \
 226                    fi; \
 227                    echo "\"Compiled on a $$os $$version system" \
 228                         "on `date +%Y-%m-%d`.\\n\"" ;; \
 229            *) ;; \
 230          esac; \
 231          files="$(all-Banner-files)";                           \
 232          if test -n "$$files"; then                             \
 233            echo "\"Available extensions:\\n\"";                 \
 234            sed -e '/^#/d' -e 's/^[[:space:]]*/  /'              \
 235                -e 's/\(^.*$$\)/\"\1\\n\"/' $$files;             \
 236          fi) > $@T
 237         mv -f $@T $@