csu/Makefile

   1 # Makefile for csu code for GNU C library.
   2 # Copyright (C) 1995,96,97,98,99,2000,01,2002 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 = $(objpfx)version-info.h
  44
  45 all: # Make this the default target; it will be defined in Rules.
  46
  47 include ../Makeconfig
  48
  49 ifeq (yes,$(build-bounded))
  50 extra-objs += b$(start-installed-name)
  51 install-lib += b$(start-installed-name)
  52 endif
  53
  54 ifneq ($(start-installed-name),$(static-start-installed-name))
  55 extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
  56 omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
  57                              g$(static-start-installed-name))
  58 install-lib += $(static-start-installed-name) g$(static-start-installed-name)
  59 endif
  60
  61 ifeq (yes,$(elf))
  62 before-compile += $(objpfx)abi-tag.h
  63 generated += abi-tag.h
  64 endif
  65
  66 ifneq (yes,$(gnu-ld))
  67 libc-init = munch-init
  68 $(objpfx)munch-init.c: munch.awk munch-tmpl.c $(+subdir_inits)
  69         $(AWK) -f $< subdirs='$(+init_subdirs)' $(word 2,$^) > $@-t
  70         mv -f $@-t $@
  71 generated += munch-init.c
  72
  73 # All initialization source files.
  74 +subdir_inits   := $(wildcard $(foreach dir,$(subdirs),$(dir)/init-$(dir).c))
  75 # All subdirectories containing initialization source files.
  76 +init_subdirs   := $(patsubst %/,%,$(dir $(+subdir_inits)))
  77 endif
  78
  79 ifeq ($(have-initfini),yes)
  80
  81 CPPFLAGS += -DHAVE_INITFINI
  82
  83 # We don't want this compiled with PIC.
  84 # It's never included in shared libraries, unlike the rest of libc_nonshared.a.
  85 CPPFLAGS-elf-init.oS = $(patsubst %,-UPIC,$(pic-ccflag))
  86 CFLAGS-elf-init.oS = $(patsubst -f%,-fno-%,$(pic-ccflag))
  87
  88 # These are the special initializer/finalizer files.  They are always the
  89 # first and last file in the link.  crti.o ... crtn.o define the global
  90 # "functions" _init and _fini to run the .init and .fini sections.
  91 crtstuff = crti crtn
  92
  93 install-lib += $(crtstuff:=.o)
  94 extra-objs += $(crtstuff:=.o)
  95 generated += $(crtstuff:=.S) initfini.s defs.h
  96 omit-deps += $(crtstuff)
  97
  98 # Special rules for the building of crti.o and crtn.o
  99 $(objpfx)crt%.o: $(objpfx)crt%.S $(objpfx)defs.h
 100         $(compile.S) -g0 $(ASFLAGS-.os) -o $@
 101
 102 CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions
 103
 104 vpath initfini.c $(full_config_sysdirs)
 105
 106 $(objpfx)initfini.s: initfini.c
 107         $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
 108                 $(patsubst -f%,-fno-%,$(exceptions)) -o $@
 109
 110 # We only have one kind of startup code files.  Static binaries and
 111 # shared libraries are build using the PIC version.
 112 $(objpfx)crti.S: $(objpfx)initfini.s
 113         sed -n -e '1,/@HEADER_ENDS/p' \
 114                -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
 115                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 116
 117 $(objpfx)crtn.S: $(objpfx)initfini.s
 118         sed -n -e '1,/@HEADER_ENDS/p' \
 119                -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
 120                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 121
 122 # These explicit rules are necessary when the $(objpfx) subdirectory
 123 # did not exist at the time make considered the implicit rules using it.
 124 # This comes up with a fresh build using no_deps=t.
 125 $(patsubst %,$(objpfx)crt%.o,i n): %.o: %.S
 126
 127 $(objpfx)defs.h: $(objpfx)initfini.s
 128         sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
 129                 $(AWK) -f defs.awk > $@
 130
 131 endif
 132
 133 ifeq (yes,$(elf))
 134 extra-objs += abi-note.o init.o
 135 asm-CPPFLAGS += -I$(objpfx).
 136 endif
 137
 138 include ../Rules
 139
 140 # Make these in the lib pass so they're available in time to link things with.
 141 subdir_lib: $(extra-objs:%=$(objpfx)%)
 142
 143 define link-relocatable
 144 $(CC) -nostdlib -nostartfiles -r -o $@ $^
 145 endef
 146
 147 ifndef start-installed-name-rule
 148 ifeq (yes,$(elf))
 149 # We link the ELF startfile along with a SHT_NOTE section indicating
 150 # the kernel ABI the binaries linked with this library will require.
 151 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
 152                                   $(objpfx)init.o
 153         $(link-relocatable)
 154 $(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \
 155                                   $(objpfx)init.ob
 156         $(link-relocatable)
 157 else
 158 # The startfile is installed under different names, so we just call our
 159 # source file `start.c' and copy to the installed name after compiling.
 160 $(objpfx)$(start-installed-name): $(objpfx)start.o
 161         rm -f $@
 162         ln $< $@
 163 $(objpfx)b$(start-installed-name): $(objpfx)start.ob
 164         rm -f $@
 165         ln $< $@
 166 endif
 167 endif
 168
 169 # The profiling startfile is made by linking together the normal
 170 # startfile with gmon-start.o, which defines a constructor function
 171 # to turn on profiling code at startup.
 172 $(addprefix $(objpfx),$(sort g$(start-installed-name) \
 173                              g$(static-start-installed-name))): \
 174   $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
 175         $(link-relocatable)
 176
 177 # These extra files are sometimes expected by system standard linking
 178 # procedures, but we have nothing for them to do.  So compile empty files.
 179 $(addprefix $(objpfx),$(filter-out $(start-installed-name),$(csu-dummies))):
 180         @-rm -f $(@:.o=.c)
 181         echo > $(@:.o=.c)
 182         $(COMPILE.c) $(@:.o=.c) $(OUTPUT_OPTION)
 183         rm -f $(@:.o=.c)
 184
 185 # These headers are used by the startup code.
 186 $(objpfx)abi-tag.h: $(..)abi-tags
 187         $(make-target-directory)
 188         rm -f $@.new
 189         sed -e 's/#.*$$//' -e '/^[      ]*$$/d' $< | \
 190         while read conf tagos tagver; do \
 191           test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
 192                      : "$$conf"` != 0 || continue; \
 193           ( echo "$$tagos" | \
 194             sed -e 's/[^0-9xXa-fA-F     ]//' \
 195                 -e 's/^/#define __ABI_TAG_OS /'; \
 196             echo "#ifndef __ABI_TAG_VERSION"; \
 197             echo "$$tagver" | \
 198             sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
 199               -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
 200             echo "#endif" ) > $@.new; \
 201         done
 202         if test -r $@.new; then mv -f $@.new $@; \
 203         else echo >&2 'This configuration not matched in $<'; exit 1; fi
 204
 205 all-Banner-files = $(wildcard $(addsuffix /Banner, \
 206                                         $(addprefix $(..), $(subdirs))))
 207 $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
 208         $(make-target-directory)
 209         (case $(config-os) in \
 210            linux*) version=`(echo -e "#include <linux/version.h>\nUTS_RELEASE"\
 211                              | $(CC) -E -P - | \
 212                              sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
 213                    if [ -z "$$version" ]; then \
 214                      if [ -r /proc/version ]; then \
 215                        version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
 216                                 < /proc/version`; \
 217                      else \
 218                        version=`uname -r`; \
 219                      fi; \
 220                    fi; \
 221                    os=`uname -s 2> /dev/null`; \
 222                    if [ -z "$$os" ]; then \
 223                      os=Linux; \
 224                    fi; \
 225                    echo "\"Compiled on a $$os $$version system" \
 226                         "on `date +%Y-%m-%d`.\\n\"" ;; \
 227            *) ;; \
 228          esac; \
 229          files="$(all-Banner-files)";                           \
 230          if test -n "$$files"; then                             \
 231            echo "\"Available extensions:\\n\"";                 \
 232            sed -e '/^#/d' -e 's/^[[:space:]]*/  /'              \
 233                -e 's/\(^.*$$\)/\"\1\\n\"/' $$files;             \
 234          fi) > $@T
 235         mv -f $@T $@