1: # Makefile for csu code for GNU C library.
    2: # Copyright (C) 1995-2004, 2005, 2006 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) $(csu-dummies) \
   37:              S$(start-installed-name)
   38: omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
   39:                              b$(start-installed-name) $(csu-dummies) \
   40:                              S$(start-installed-name))
   41: install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
   42: distribute = initfini.c gmon-start.c start.c defs.awk \
   43:              abi-note.S init.c c not-cancel.h
   44: generated = version-info.h
   45: before-compile = $(objpfx)version-info.h
   46: 
   47: tests := tst-empty tst-atomic tst-atomic-long
   48: tests-static := tst-empty
   49: 
   50: all: # Make this the default target; it will be defined in Rules.
   51: 
   52: include ../Makeconfig
   53: 
   54: ifeq (yes,$(build-shared))
   55: extra-objs += S$(start-installed-name)
   56: install-lib += S$(start-installed-name)
   57: generated += start.os
   58: endif
   59: 
   60: ifeq (yes,$(build-bounded))
   61: extra-objs += b$(start-installed-name)
   62: install-lib += b$(start-installed-name)
   63: generated += start.ob
   64: endif
   65: 
   66: ifneq ($(start-installed-name),$(static-start-installed-name))
   67: extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
   68: omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
   69:                              g$(static-start-installed-name))
   70: install-lib += $(static-start-installed-name) g$(static-start-installed-name)
   71: endif
   72: 
   73: ifeq (yes,$(elf))
   74: before-compile += $(objpfx)abi-tag.h
   75: generated += abi-tag.h
   76: endif
   77: 
   78: ifeq ($(have-initfini),yes)
   79: 
   80: CPPFLAGS += -DHAVE_INITFINI
   81: 
   82: # These are the special initializer/finalizer files.  They are always the
   83: # first and last file in the link.  crti.o ... crtn.o define the global
   84: # "functions" _init and _fini to run the .init and .fini sections.
   85: crtstuff = crti crtn
   86: 
   87: install-lib += $(crtstuff:=.o)
   88: extra-objs += $(crtstuff:=.o)
   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 > $@
  124: 
  125: endif
  126: 
  127: ifeq (yes,$(elf))
  128: extra-objs += abi-note.o init.o
  129: asm-CPPFLAGS += -I$(objpfx).
  130: endif
  131: 
  132: include ../Rules
  133: 
  134: # Make these in the lib pass so they're available in time to link things with.
  135: subdir_lib: $(extra-objs:%=$(objpfx)%)
  136: 
  137: define link-relocatable
  138: $(CC) -nostdlib -nostartfiles -r -o $@ $^
  139: endef
  140: 
  141: ifndef start-installed-name-rule
  142: ifeq (yes,$(elf))
  143: # We link the ELF startfile along with a SHT_NOTE section indicating
  144: # the kernel ABI the binaries linked with this library will require.
  145: $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
  146:                                   $(objpfx)init.o
  147:         $(link-relocatable)
  148: $(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \
  149:                                   $(objpfx)init.o
  150:         $(link-relocatable)
  151: $(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \
  152:                                   $(objpfx)init.ob
  153:         $(link-relocatable)
  154: else
  155: # The startfile is installed under different names, so we just call our
  156: # source file `start.c' and copy to the installed name after compiling.
  157: $(objpfx)$(start-installed-name): $(objpfx)start.o
  158:         rm -f $@
  159:         ln $< $@
  160: $(objpfx)S$(start-installed-name): $(objpfx)start.os
  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:   $(before-compile)
  181:         $(COMPILE.c) -o $@ -x c /dev/null
  182: 
  183: # These headers are used by the startup code.
  184: $(objpfx)abi-tag.h: $(..)abi-tags
  185:         $(make-target-directory)
  186:         rm -f $@.new
  187:         sed -e 's/#.*$$//' -e '/^[     ]*$$/d' $< | \
  188:         while read conf tagos tagver; do \
  189:           test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
  190:                      : "$$conf"` != 0 || continue; \
  191:           ( echo "$$tagos" | \
  192:             sed -e 's/[^0-9xXa-fA-F    ]//' \
  193:                 -e 's/^/#define __ABI_TAG_OS /'; \
  194:             echo "#ifndef __ABI_TAG_VERSION"; \
  195:             echo "$$tagver" | \
  196:             sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
  197:               -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
  198:             echo "#endif" ) > $@.new; \
  199:         done
  200:         if test -r $@.new; then mv -f $@.new $@; \
  201:         else echo >&2 'This configuration not matched in $<'; exit 1; fi
  202: 
  203: all-Banner-files = $(wildcard $(addsuffix /Banner,\
  204:                                           $(sort $(subdir-srcdirs) \
  205:                                                  $(sysdeps-srcdirs))))
  206: $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
  207:         $(make-target-directory)
  208:         (case $(config-os) in \
  209:            linux*) version=`(printf '%s\n%s\n' \
  210:                                     '#include <linux/version.h>' \
  211:                                     UTS_RELEASE \
  212:                              | $(CC) $(CPPFLAGS) -E -P - -DNOT_IN_libc=1 | \
  213:                              sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
  214:                    if [ -z "$$version" ]; then \
  215:                      if [ -r /proc/version ]; then \
  216:                        version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
  217:                                 < /proc/version`; \
  218:                      else \
  219:                        version=`uname -r`; \
  220:                      fi; \
  221:                    fi; \
  222:                    os=`uname -s 2> /dev/null`; \
  223:                    if [ -z "$$os" ]; then \
  224:                      os=Linux; \
  225:                    fi; \
  226:                    printf '"Compiled on a %s %s system on %s.\\n"\n' \
  227:                           "$$os" "$$version" "`date +%Y-%m-%d`";; \
  228:            *) ;; \
  229:          esac; \
  230:          files="$(all-Banner-files)";                          \
  231:          if test -n "$$files"; then                            \
  232:            printf '"Available extensions:\\n"\n';              \
  233:            sed -e '/^#/d' -e 's/^[[:space:]]*/ /'              \
  234:                -e 's/^\(.*\)$$/\"\1\\n\"/' $$files;            \
  235:          fi) > $@T
  236:         mv -f $@T $@