# Makefile for csu code for GNU C library. # Copyright (C) 1995, 1996, 1997, 1998 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 Library General Public License # as published by the Free Software Foundation; either version 2 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 # Library General Public License for more details. # You should have received a copy of the GNU Library General Public # License along with the GNU C Library; see the file COPYING.LIB. 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 in 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 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) omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \ $(csu-dummies)) install-lib = $(start-installed-name) g$(start-installed-name) \ $(csu-dummies) distribute = initfini.c gmon-start.c start.c defs.awk munch.awk \ abi-note.S init.c munch-tmpl.c generated = version-info.h before-compile = $(objpfx)version-info.h all: # Make this the default target; it will be defined in Rules. include ../Makeconfig ifeq (yes,$(elf)) before-compile += $(objpfx)abi-tag.h generated += abi-tag.h endif ifeq (yes,$(gnu-ld)) libc-init = set-init else libc-init = munch-init $(objpfx)munch-init.c: munch.awk munch-tmpl.c $(+subdir_inits) $(AWK) -f $< subdirs='$(+init_subdirs)' $(word 2,$^) > $@-t mv -f $@-t $@ generated += munch-init.c # All initialization source files. +subdir_inits := $(wildcard $(foreach dir,$(subdirs),$(dir)/init-$(dir).c)) # All subdirectories containing initialization source files. +init_subdirs := $(patsubst %/,%,$(dir $(+subdir_inits))) endif ifeq ($(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) generated += $(crtstuff:=.S) initfini.s defs.h omit-deps += $(crtstuff) # Special rules for the building of crti.o and crtn.o $(objpfx)crt%.o: $(objpfx)crt%.S $(objpfx)defs.h $(compile.S) -g0 $(ASFLAGS-.os) -o $@ CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions $(objpfx)initfini.s: initfini.c $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \ $(no-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' $< > $@ $(objpfx)defs.h: $(objpfx)initfini.s sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \ $(AWK) -f defs.awk > $@ endif ifeq (yes,$(elf)) extra-objs += abi-note.o init.o asm-CPPFLAGS += -I$(objpfx). endif include ../Rules define link-relocatable $(CC) -nostdlib -nostartfiles -r -o $@ $^ endef ifndef start-installed-name-rule ifeq (yes,$(elf)) # 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) else # The startfile is installed under different names, so we just call our # source file `start.c' and copy to the installed name after compiling. $(objpfx)$(start-installed-name): $(objpfx)start.o rm -f $@ ln $< $@ endif 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. $(objpfx)g$(start-installed-name): $(objpfx)$(start-installed-name) \ $(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))): cp /dev/null $(@:.o=.c) $(COMPILE.c) $(@:.o=.c) $(OUTPUT_OPTION) rm -f $(@:.o=.c) # 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' $< | \ while read conf tag; do \ test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \ : "$$conf"` != 0 || continue; \ echo "$$tag" | \ sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \ -e 's/ /,/g' -e 's/^ */#define ABI_TAG /' > $@.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, \ $(addprefix $(..), $(subdirs)))) $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files) $(make-target-directory) (case $(config-os) in \ linux*) version=`(echo -e "#include \nUTS_RELEASE"\ | $(CC) -E -P - | \ sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\ if [ -z "$$version" ]; then \ if [ -r /proc/version ]; then \ version=`sed 's/.*version \([^ ]*\) .*/>>\1< $@T mv -f $@T $@