# Makefile for csu code for GNU C library. # Copyright (C) 1995-2006, 2010, 2012 Free Software Foundation, Inc. # This file is part of the GNU C Library. # The GNU C Library is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser General Public # License as published by the Free Software Foundation; either # version 2.1 of the License, or (at your option) any later version. # The GNU C Library is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # Lesser General Public License for more details. # You should have received a copy of the GNU Lesser General Public # License along with the GNU C Library; if not, write to the Free # Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA # 02111-1307 USA. # This directory contains the C startup code (that which calls main). This # consists of the startfile, built from start.c and installed as crt0.o # (traditionally) or crt1.o (for ELF). In ELF we also install crti.o and # crtn.o, special "initializer" and "finalizer" files used in the link # to make the .init and .fini sections work right; both these files are # built (in an arcane manner) from initfini.c. subdir := csu routines = init-first libc-start $(libc-init) sysdep version check_fds \ libc-tls elf-init dso_handle aux = errno elide-routines.os = libc-tls static-only-routines = elf-init csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.o) extra-objs = start.o gmon-start.o \ $(start-installed-name) g$(start-installed-name) $(csu-dummies) \ S$(start-installed-name) omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \ b$(start-installed-name) $(csu-dummies) \ S$(start-installed-name)) install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies) distribute = initfini.c gmon-start.c start.c defs.awk \ abi-note.S init.c c not-cancel.h generated = version-info.h before-compile = $(objpfx)version-info.h tests := tst-empty tst-atomic tst-atomic-long tests-static := tst-empty all: # Make this the default target; it will be defined in Rules. include ../Makeconfig ifeq (yes,$(build-shared)) extra-objs += S$(start-installed-name) install-lib += S$(start-installed-name) generated += start.os endif ifeq (yes,$(build-bounded)) extra-objs += b$(start-installed-name) install-lib += b$(start-installed-name) generated += start.ob endif ifneq ($(start-installed-name),$(static-start-installed-name)) extra-objs += $(static-start-installed-name) g$(static-start-installed-name) omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \ g$(static-start-installed-name)) install-lib += $(static-start-installed-name) g$(static-start-installed-name) endif before-compile += $(objpfx)abi-tag.h generated += abi-tag.h ifeq ($(have-initfini),yes) CPPFLAGS += -DHAVE_INITFINI # These are the special initializer/finalizer files. They are always the # first and last file in the link. crti.o ... crtn.o define the global # "functions" _init and _fini to run the .init and .fini sections. crtstuff = crti crtn install-lib += $(crtstuff:=.o) extra-objs += $(crtstuff:=.o) # Conditionals on the existence of a sysdeps version of crti.S are # temporary until all targets either have such a file or have been # removed, after which the old approach of postprocessing compiler # output will be removed. ifeq (,$(wildcard $(sysdirs:%=%/crti.S))) generated += $(crtstuff:=.S) initfini.s defs.h omit-deps += $(crtstuff) # Special rules for the building of crti.o and crtn.o $(crtstuff:%=$(objpfx)%.o): %.o: %.S $(objpfx)defs.h $(compile.S) -g0 $(ASFLAGS-.os) -o $@ CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions $(fno-unit-at-a-time) vpath initfini.c $(sysdirs) $(objpfx)initfini.s: initfini.c $(before-compile) $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \ $(patsubst -f%,-fno-%,$(exceptions)) -o $@ # We only have one kind of startup code files. Static binaries and # shared libraries are build using the PIC version. $(objpfx)crti.S: $(objpfx)initfini.s sed -n -e '1,/@HEADER_ENDS/p' \ -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \ -e '/@TRAILER_BEGINS/,$$p' $< > $@ $(objpfx)crtn.S: $(objpfx)initfini.s sed -n -e '1,/@HEADER_ENDS/p' \ -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \ -e '/@TRAILER_BEGINS/,$$p' $< > $@ # These explicit rules are necessary when the $(objpfx) subdirectory # did not exist at the time make considered the implicit rules using it. # This comes up with a fresh build using no_deps=t. $(patsubst %,$(objpfx)crt%.o,i n): %.o: %.S $(objpfx)defs.h: $(objpfx)initfini.s sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \ $(AWK) -f defs.awk > $@ endif endif extra-objs += abi-note.o init.o asm-CPPFLAGS += -I$(objpfx). include ../Rules # Make these in the lib pass so they're available in time to link things with. subdir_lib: $(extra-objs:%=$(objpfx)%) define link-relocatable $(CC) -nostdlib -nostartfiles -r -o $@ $^ endef ifndef start-installed-name-rule # We link the ELF startfile along with a SHT_NOTE section indicating # the kernel ABI the binaries linked with this library will require. $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \ $(objpfx)init.o $(link-relocatable) $(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \ $(objpfx)init.o $(link-relocatable) $(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \ $(objpfx)init.ob $(link-relocatable) endif # The profiling startfile is made by linking together the normal # startfile with gmon-start.o, which defines a constructor function # to turn on profiling code at startup. $(addprefix $(objpfx),$(sort g$(start-installed-name) \ g$(static-start-installed-name))): \ $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o $(link-relocatable) # These extra files are sometimes expected by system standard linking # procedures, but we have nothing for them to do. So compile empty files. $(addprefix $(objpfx),$(filter-out $(start-installed-name), $(csu-dummies))):\ $(before-compile) $(COMPILE.c) -o $@ -x c /dev/null # These headers are used by the startup code. $(objpfx)abi-tag.h: $(..)abi-tags $(make-target-directory) rm -f $@.new sed -e 's/#.*$$//' -e '/^[ ]*$$/d' $< | \ while read conf tagos tagver; do \ test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \ : "$$conf"` != 0 || continue; \ ( echo "$$tagos" | \ sed -e 's/[^0-9xXa-fA-F ]//' \ -e 's/^/#define __ABI_TAG_OS /'; \ echo "#ifndef __ABI_TAG_VERSION"; \ echo "$$tagver" | \ sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \ -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \ echo "#endif" ) > $@.new; \ done if test -r $@.new; then mv -f $@.new $@; \ else echo >&2 'This configuration not matched in $<'; exit 1; fi all-Banner-files = $(wildcard $(addsuffix /Banner,\ $(sort $(subdir-srcdirs) \ $(sysdeps-srcdirs)))) $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files) $(make-target-directory) (case $(config-os) in \ linux*) version=`(printf '%s\n%s\n' \ '#include ' \ UTS_RELEASE \ | $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 | \ sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\ if [ -z "$$version" ]; then \ version=`(printf '%s\n%s\n' \ '#include ' \ LINUX_VERSION_CODE \ | $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 \ | sed -n -e '/^[123456789].*/p' \ | awk '{v=$$1; \ printf("%d.%d.%d\n", \ v/65535, v/256%256, v%256)}') \ 2>/dev/null`; \ fi; \ if [ -z "$$version" ]; then \ if [ -r /proc/version ]; then \ version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1< /dev/null`; \ if [ -z "$$os" ]; then \ os=Linux; \ fi; \ printf '"Compiled on a %s %s system on %s.\\n"\n' \ "$$os" "$$version" "`date +%Y-%m-%d`";; \ *) ;; \ esac; \ files="$(all-Banner-files)"; \ if test -n "$$files"; then \ printf '"Available extensions:\\n"\n'; \ sed -e '/^#/d' -e 's/^[[:space:]]*/ /' \ -e 's/^\(.*\)$$/\"\1\\n\"/' $$files; \ fi) > $@T mv -f $@T $@