csu/Makefile

   1 # Makefile for csu code for GNU C library.
   2 # Copyright (C) 1995-2014 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 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 before-compile += $(objpfx)abi-tag.h
  64 generated += abi-tag.h
  65
  66 # These are the special initializer/finalizer files.  They are always the
  67 # first and last file in the link.  crti.o ... crtn.o define the global
  68 # "functions" _init and _fini to run the .init and .fini sections.
  69 crtstuff = crti crtn
  70
  71 install-lib += $(crtstuff:=.o)
  72 extra-objs += $(crtstuff:=.o)
  73
  74 extra-objs += abi-note.o init.o
  75 asm-CPPFLAGS += -I$(objpfx).
  76
  77 include ../Rules
  78
  79 # Make these in the lib pass so they're available in time to link things with.
  80 subdir_lib: $(extra-objs:%=$(objpfx)%)
  81
  82 define link-relocatable
  83 $(CC) -nostdlib -nostartfiles -r -o $@ $^
  84 endef
  85
  86 ifndef start-installed-name-rule
  87 # We link the ELF startfile along with a SHT_NOTE section indicating
  88 # the kernel ABI the binaries linked with this library will require.
  89 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
  90                                   $(objpfx)init.o
  91         $(link-relocatable)
  92 $(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \
  93                                   $(objpfx)init.o
  94         $(link-relocatable)
  95 endif
  96
  97 # The profiling startfile is made by linking together the normal
  98 # startfile with gmon-start.o, which defines a constructor function
  99 # to turn on profiling code at startup.
 100 $(addprefix $(objpfx),$(sort g$(start-installed-name) \
 101                              g$(static-start-installed-name))): \
 102   $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
 103         $(link-relocatable)
 104
 105 # These extra files are sometimes expected by system standard linking
 106 # procedures, but we have nothing for them to do.  So compile empty files.
 107 $(addprefix $(objpfx),$(filter-out $(start-installed-name), $(csu-dummies))):\
 108   $(before-compile)
 109         $(COMPILE.c) -o $@ -x c /dev/null
 110
 111 # These headers are used by the startup code.
 112 $(objpfx)abi-tag.h: $(..)abi-tags
 113         $(make-target-directory)
 114         rm -f $@.new
 115         sed -e 's/#.*$$//' -e '/^[      ]*$$/d' $< | \
 116         while read conf tagos tagver; do \
 117           test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
 118                      : "$$conf"` != 0 || continue; \
 119           ( echo "$$tagos" | \
 120             sed -e 's/[^0-9xXa-fA-F     ]//' \
 121                 -e 's/^/#define __ABI_TAG_OS /'; \
 122             echo "#ifndef __ABI_TAG_VERSION"; \
 123             echo "$$tagver" | \
 124             sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
 125               -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
 126             echo "#endif" ) > $@.new; \
 127         done
 128         if test -r $@.new; then mv -f $@.new $@; \
 129         else echo >&2 'This configuration not matched in $<'; exit 1; fi
 130
 131 all-Banner-files = $(wildcard $(addsuffix /Banner,\
 132                                           $(sort $(subdir-srcdirs) \
 133                                                  $(sysdeps-srcdirs))))
 134 $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
 135         $(make-target-directory)
 136         (case $(config-os) in \
 137            linux*) version=`(printf '%s\n%s\n' \
 138                                     '#include <linux/version.h>' \
 139                                     UTS_RELEASE \
 140                              | $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 | \
 141                              sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
 142                    if [ -z "$$version" ]; then \
 143                      version=`(printf '%s\n%s\n' \
 144                                       '#include <linux/version.h>' \
 145                                        LINUX_VERSION_CODE \
 146                                | $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 \
 147                                | sed -n -e '/^[123456789].*/p' \
 148                                | awk '{v=$$1; \
 149                                        printf("%d.%d.%d\n", \
 150                                               v/65535, v/256%256, v%256)}') \
 151                                 2>/dev/null`; \
 152                    fi; \
 153                    if [ -z "$$version" ]; then \
 154                      if [ -r /proc/version ]; then \
 155                        version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
 156                                 < /proc/version`; \
 157                      else \
 158                        version=`uname -r`; \
 159                      fi; \
 160                    fi; \
 161                    os=`uname -s 2> /dev/null`; \
 162                    if [ -z "$$os" ]; then \
 163                      os=Linux; \
 164                    fi; \
 165                    printf '"Compiled on a %s %s system on %s.\\n"\n' \
 166                           "$$os" "$$version" "`date +%Y-%m-%d`";; \
 167            *) ;; \
 168          esac; \
 169          files="$(all-Banner-files)";                           \
 170          if test -n "$$files"; then                             \
 171            printf '"Available extensions:\\n"\n';               \
 172            sed -e '/^#/d' -e 's/^[[:space:]]*/  /'              \
 173                -e 's/^\(.*\)$$/\"\1\\n\"/' $$files;             \
 174          fi) > $@T
 175         mv -f $@T $@