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# 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
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) \
$(csu-dummies)
distribute = initfini.c gmon-start.c start.c defs.awk abi-note.S init.c
all: # Make this the default target; it will be defined in Rules.
include ../Makeconfig
ifeq ($(elf),yes)
before-compile = $(objpfx)abi-tag.h
generated += abi-tag.h
endif
ifeq ($(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 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)
/ := $$/# bite me.
$(objpfx)abi-tag.h: $(..)abi-tags
$(make-target-directory)
rm -f $@.new
sed 's/#.*$//;/^[ ]*$$/d' $< | while read conf tag; do \
test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
: "$$conf"` != 0 || continue; \
echo "$$tag" | sed > $@.new \
's/[^0-9xXa-fA-F]/ /g;s/ *$//;s/ /,/g;s/^ */#define ABI_TAG /';\
done
if test -r $@.new; then mv -f $@.new $@; \
else echo >&2 'This configuration not matched in $<'; exit 1; fi
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