csu/Makefile

   1 # Makefile for csu code for GNU C library.
   2 # Copyright (C) 1995-2013 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.
  24
  25 subdir := csu
  26
  27 routines = init-first libc-start $(libc-init) sysdep version check_fds \
  28            libc-tls elf-init dso_handle
  29 aux      = errno
  30 elide-routines.os = libc-tls
  31 static-only-routines = elf-init
  32 csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.o)
  33 extra-objs = start.o gmon-start.o \
  34              $(start-installed-name) g$(start-installed-name) $(csu-dummies) \
  35              S$(start-installed-name)
  36 omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
  37                              b$(start-installed-name) $(csu-dummies) \
  38                              S$(start-installed-name))
  39 install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
  40 generated = version-info.h
  41 before-compile = $(objpfx)version-info.h
  42
  43 tests := tst-empty tst-atomic tst-atomic-long
  44 tests-static := tst-empty
  45
  46 all: # Make this the default target; it will be defined in Rules.
  47
  48 include ../Makeconfig
  49
  50 ifeq (yes,$(build-shared))
  51 extra-objs += S$(start-installed-name)
  52 install-lib += S$(start-installed-name)
  53 generated += start.os
  54 endif
  55
  56 ifeq (yes,$(build-bounded))
  57 extra-objs += b$(start-installed-name)
  58 install-lib += b$(start-installed-name)
  59 generated += start.ob
  60 endif
  61
  62 ifneq ($(start-installed-name),$(static-start-installed-name))
  63 extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
  64 omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
  65                              g$(static-start-installed-name))
  66 install-lib += $(static-start-installed-name) g$(static-start-installed-name)
  67 endif
  68
  69 before-compile += $(objpfx)abi-tag.h
  70 generated += abi-tag.h
  71
  72 # These are the special initializer/finalizer files.  They are always the
  73 # first and last file in the link.  crti.o ... crtn.o define the global
  74 # "functions" _init and _fini to run the .init and .fini sections.
  75 crtstuff = crti crtn
  76
  77 install-lib += $(crtstuff:=.o)
  78 extra-objs += $(crtstuff:=.o)
  79
  80 extra-objs += abi-note.o init.o
  81 asm-CPPFLAGS += -I$(objpfx).
  82
  83 include ../Rules
  84
  85 # Make these in the lib pass so they're available in time to link things with.
  86 subdir_lib: $(extra-objs:%=$(objpfx)%)
  87
  88 define link-relocatable
  89 $(CC) -nostdlib -nostartfiles -r -o $@ $^
  90 endef
  91
  92 ifndef start-installed-name-rule
  93 # We link the ELF startfile along with a SHT_NOTE section indicating
  94 # the kernel ABI the binaries linked with this library will require.
  95 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
  96                                   $(objpfx)init.o
  97         $(link-relocatable)
  98 $(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \
  99                                   $(objpfx)init.o
 100         $(link-relocatable)
 101 $(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \
 102                                   $(objpfx)init.ob
 103         $(link-relocatable)
 104 endif
 105
 106 # The profiling startfile is made by linking together the normal
 107 # startfile with gmon-start.o, which defines a constructor function
 108 # to turn on profiling code at startup.
 109 $(addprefix $(objpfx),$(sort g$(start-installed-name) \
 110                              g$(static-start-installed-name))): \
 111   $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
 112         $(link-relocatable)
 113
 114 # These extra files are sometimes expected by system standard linking
 115 # procedures, but we have nothing for them to do.  So compile empty files.
 116 $(addprefix $(objpfx),$(filter-out $(start-installed-name), $(csu-dummies))):\
 117   $(before-compile)
 118         $(COMPILE.c) -o $@ -x c /dev/null
 119
 120 # These headers are used by the startup code.
 121 $(objpfx)abi-tag.h: $(..)abi-tags
 122         $(make-target-directory)
 123         rm -f $@.new
 124         sed -e 's/#.*$$//' -e '/^[      ]*$$/d' $< | \
 125         while read conf tagos tagver; do \
 126           test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
 127                      : "$$conf"` != 0 || continue; \
 128           ( echo "$$tagos" | \
 129             sed -e 's/[^0-9xXa-fA-F     ]//' \
 130                 -e 's/^/#define __ABI_TAG_OS /'; \
 131             echo "#ifndef __ABI_TAG_VERSION"; \
 132             echo "$$tagver" | \
 133             sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
 134               -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
 135             echo "#endif" ) > $@.new; \
 136         done
 137         if test -r $@.new; then mv -f $@.new $@; \
 138         else echo >&2 'This configuration not matched in $<'; exit 1; fi
 139
 140 all-Banner-files = $(wildcard $(addsuffix /Banner,\
 141                                           $(sort $(subdir-srcdirs) \
 142                                                  $(sysdeps-srcdirs))))
 143 $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
 144         $(make-target-directory)
 145         (case $(config-os) in \
 146            linux*) version=`(printf '%s\n%s\n' \
 147                                     '#include <linux/version.h>' \
 148                                     UTS_RELEASE \
 149                              | $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 | \
 150                              sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
 151                    if [ -z "$$version" ]; then \
 152                      version=`(printf '%s\n%s\n' \
 153                                       '#include <linux/version.h>' \
 154                                        LINUX_VERSION_CODE \
 155                                | $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 \
 156                                | sed -n -e '/^[123456789].*/p' \
 157                                | awk '{v=$$1; \
 158                                        printf("%d.%d.%d\n", \
 159                                               v/65535, v/256%256, v%256)}') \
 160                                 2>/dev/null`; \
 161                    fi; \
 162                    if [ -z "$$version" ]; then \
 163                      if [ -r /proc/version ]; then \
 164                        version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
 165                                 < /proc/version`; \
 166                      else \
 167                        version=`uname -r`; \
 168                      fi; \
 169                    fi; \
 170                    os=`uname -s 2> /dev/null`; \
 171                    if [ -z "$$os" ]; then \
 172                      os=Linux; \
 173                    fi; \
 174                    printf '"Compiled on a %s %s system on %s.\\n"\n' \
 175                           "$$os" "$$version" "`date +%Y-%m-%d`";; \
 176            *) ;; \
 177          esac; \
 178          files="$(all-Banner-files)";                           \
 179          if test -n "$$files"; then                             \
 180            printf '"Available extensions:\\n"\n';               \
 181            sed -e '/^#/d' -e 's/^[[:space:]]*/  /'              \
 182                -e 's/^\(.*\)$$/\"\1\\n\"/' $$files;             \
 183          fi) > $@T
 184         mv -f $@T $@