csu/Makefile

   1 # Makefile for csu code for GNU C library.
   2 # Copyright (C) 1995-2006, 2010, 2012 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, see
  17 # <http://www.gnu.org/licenses/>.
  18
  19 # This directory contains the C startup code (that which calls main).  This
  20 # consists of the startfile, built from start.c and installed as crt0.o
  21 # (traditionally) or crt1.o (for ELF).  In ELF we also install crti.o and
  22 # crtn.o, special "initializer" and "finalizer" files used in the link
  23 # to make the .init and .fini sections work right; both these files are
  24 # built (in an arcane manner) from initfini.c.
  25
  26 subdir := csu
  27
  28 routines = init-first libc-start $(libc-init) sysdep version check_fds \
  29            libc-tls elf-init dso_handle
  30 aux      = errno
  31 elide-routines.os = libc-tls
  32 static-only-routines = elf-init
  33 csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.o)
  34 extra-objs = start.o gmon-start.o \
  35              $(start-installed-name) g$(start-installed-name) $(csu-dummies) \
  36              S$(start-installed-name)
  37 omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
  38                              b$(start-installed-name) $(csu-dummies) \
  39                              S$(start-installed-name))
  40 install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
  41 distribute = initfini.c gmon-start.c start.c defs.awk \
  42              abi-note.S init.c c not-cancel.h
  43 generated = version-info.h
  44 before-compile = $(objpfx)version-info.h
  45
  46 tests := tst-empty tst-atomic tst-atomic-long
  47 tests-static := tst-empty
  48
  49 all: # Make this the default target; it will be defined in Rules.
  50
  51 include ../Makeconfig
  52
  53 ifeq (yes,$(build-shared))
  54 extra-objs += S$(start-installed-name)
  55 install-lib += S$(start-installed-name)
  56 generated += start.os
  57 endif
  58
  59 ifeq (yes,$(build-bounded))
  60 extra-objs += b$(start-installed-name)
  61 install-lib += b$(start-installed-name)
  62 generated += start.ob
  63 endif
  64
  65 ifneq ($(start-installed-name),$(static-start-installed-name))
  66 extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
  67 omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
  68                              g$(static-start-installed-name))
  69 install-lib += $(static-start-installed-name) g$(static-start-installed-name)
  70 endif
  71
  72 before-compile += $(objpfx)abi-tag.h
  73 generated += abi-tag.h
  74
  75 # These are the special initializer/finalizer files.  They are always the
  76 # first and last file in the link.  crti.o ... crtn.o define the global
  77 # "functions" _init and _fini to run the .init and .fini sections.
  78 crtstuff = crti crtn
  79
  80 install-lib += $(crtstuff:=.o)
  81 extra-objs += $(crtstuff:=.o)
  82
  83 # Conditionals on the existence of a sysdeps version of crti.S are
  84 # temporary until all targets either have such a file or have been
  85 # removed, after which the old approach of postprocessing compiler
  86 # output will be removed.
  87 ifeq (,$(wildcard $(sysdirs:%=%/crti.S)))
  88
  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
  98 vpath initfini.c $(sysdirs)
  99
 100 $(objpfx)initfini.s: initfini.c $(before-compile)
 101         $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
 102                 $(patsubst -f%,-fno-%,$(exceptions)) -o $@
 103
 104 # We only have one kind of startup code files.  Static binaries and
 105 # shared libraries are build using the PIC version.
 106 $(objpfx)crti.S: $(objpfx)initfini.s
 107         sed -n -e '1,/@HEADER_ENDS/p' \
 108                -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
 109                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 110
 111 $(objpfx)crtn.S: $(objpfx)initfini.s
 112         sed -n -e '1,/@HEADER_ENDS/p' \
 113                -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
 114                -e '/@TRAILER_BEGINS/,$$p' $< > $@
 115
 116 # These explicit rules are necessary when the $(objpfx) subdirectory
 117 # did not exist at the time make considered the implicit rules using it.
 118 # This comes up with a fresh build using no_deps=t.
 119 $(patsubst %,$(objpfx)crt%.o,i n): %.o: %.S
 120
 121 $(objpfx)defs.h: $(objpfx)initfini.s
 122         sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
 123                 $(AWK) -f defs.awk > $@
 124
 125 endif
 126
 127 extra-objs += abi-note.o init.o
 128 asm-CPPFLAGS += -I$(objpfx).
 129
 130 include ../Rules
 131
 132 # Make these in the lib pass so they're available in time to link things with.
 133 subdir_lib: $(extra-objs:%=$(objpfx)%)
 134
 135 define link-relocatable
 136 $(CC) -nostdlib -nostartfiles -r -o $@ $^
 137 endef
 138
 139 ifndef start-installed-name-rule
 140 # We link the ELF startfile along with a SHT_NOTE section indicating
 141 # the kernel ABI the binaries linked with this library will require.
 142 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
 143                                   $(objpfx)init.o
 144         $(link-relocatable)
 145 $(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \
 146                                   $(objpfx)init.o
 147         $(link-relocatable)
 148 $(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \
 149                                   $(objpfx)init.ob
 150         $(link-relocatable)
 151 endif
 152
 153 # The profiling startfile is made by linking together the normal
 154 # startfile with gmon-start.o, which defines a constructor function
 155 # to turn on profiling code at startup.
 156 $(addprefix $(objpfx),$(sort g$(start-installed-name) \
 157                              g$(static-start-installed-name))): \
 158   $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
 159         $(link-relocatable)
 160
 161 # These extra files are sometimes expected by system standard linking
 162 # procedures, but we have nothing for them to do.  So compile empty files.
 163 $(addprefix $(objpfx),$(filter-out $(start-installed-name), $(csu-dummies))):\
 164   $(before-compile)
 165         $(COMPILE.c) -o $@ -x c /dev/null
 166
 167 # These headers are used by the startup code.
 168 $(objpfx)abi-tag.h: $(..)abi-tags
 169         $(make-target-directory)
 170         rm -f $@.new
 171         sed -e 's/#.*$$//' -e '/^[      ]*$$/d' $< | \
 172         while read conf tagos tagver; do \
 173           test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
 174                      : "$$conf"` != 0 || continue; \
 175           ( echo "$$tagos" | \
 176             sed -e 's/[^0-9xXa-fA-F     ]//' \
 177                 -e 's/^/#define __ABI_TAG_OS /'; \
 178             echo "#ifndef __ABI_TAG_VERSION"; \
 179             echo "$$tagver" | \
 180             sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
 181               -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
 182             echo "#endif" ) > $@.new; \
 183         done
 184         if test -r $@.new; then mv -f $@.new $@; \
 185         else echo >&2 'This configuration not matched in $<'; exit 1; fi
 186
 187 all-Banner-files = $(wildcard $(addsuffix /Banner,\
 188                                           $(sort $(subdir-srcdirs) \
 189                                                  $(sysdeps-srcdirs))))
 190 $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
 191         $(make-target-directory)
 192         (case $(config-os) in \
 193            linux*) version=`(printf '%s\n%s\n' \
 194                                     '#include <linux/version.h>' \
 195                                     UTS_RELEASE \
 196                              | $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 | \
 197                              sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
 198                    if [ -z "$$version" ]; then \
 199                      version=`(printf '%s\n%s\n' \
 200                                       '#include <linux/version.h>' \
 201                                        LINUX_VERSION_CODE \
 202                                | $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 \
 203                                | sed -n -e '/^[123456789].*/p' \
 204                                | awk '{v=$$1; \
 205                                        printf("%d.%d.%d\n", \
 206                                               v/65535, v/256%256, v%256)}') \
 207                                 2>/dev/null`; \
 208                    fi; \
 209                    if [ -z "$$version" ]; then \
 210                      if [ -r /proc/version ]; then \
 211                        version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
 212                                 < /proc/version`; \
 213                      else \
 214                        version=`uname -r`; \
 215                      fi; \
 216                    fi; \
 217                    os=`uname -s 2> /dev/null`; \
 218                    if [ -z "$$os" ]; then \
 219                      os=Linux; \
 220                    fi; \
 221                    printf '"Compiled on a %s %s system on %s.\\n"\n' \
 222                           "$$os" "$$version" "`date +%Y-%m-%d`";; \
 223            *) ;; \
 224          esac; \
 225          files="$(all-Banner-files)";                           \
 226          if test -n "$$files"; then                             \
 227            printf '"Available extensions:\\n"\n';               \
 228            sed -e '/^#/d' -e 's/^[[:space:]]*/  /'              \
 229                -e 's/^\(.*\)$$/\"\1\\n\"/' $$files;             \
 230          fi) > $@T
 231         mv -f $@T $@