glibc/csu/Makefile

# Makefile for csu code for GNU C library.

# Copyright (C) 1995, 1996, 1997 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
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

all: # Make this the default target; it will be defined in Rules.

include ../Makeconfig

ifneq ($(elf),yes)

# When not using ELF, there is just one startfile, called crt0.o.
start-installed-name = crt0.o

else

# In the ELF universe, crt0.o is called crt1.o, and there are
# some additional bizarre files.
start-installed-name = crt1.o
have-initfini = yes

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 align.h end.h
omit-deps += $(crtstuff)

# Special rules for the building of crti.o and crtn.o
$(objpfx)crt%.o: $(objpfx)crt%.S $(objpfx)defs.h
	$(CC) -c -fPIC -g0 -I$(..) -I$(common-objpfx) -DASSEMBLER $< -o $@

$(objpfx)initfini.s: initfini.c
	$(CC) -S -fPIC -finhibit-size-directive $(no-exceptions) $< -o $@

$(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

include ../Rules

ifndef start-installed-name-rule
# 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

# 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.o $(objpfx)gmon-start.o
	$(CC) -nostdlib -nostartfiles -r -o $@ $^

# 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)