1 # Makefile for csu code for GNU C library.
3 # Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
4 # This file is part of the GNU C Library.
6 # The GNU C Library is free software; you can redistribute it and/or
7 # modify it under the terms of the GNU Library General Public License
8 # as published by the Free Software Foundation; either version 2 of
9 # the License, or (at your option) any later version.
11 # The GNU C Library is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # Library General Public License for more details.
16 # You should have received a copy of the GNU Library General Public
17 # License along with the GNU C Library; see the file COPYING.LIB. If not,
18 # write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 # Boston, MA 02111-1307, USA.
21 # This directory contains the C startup code (that which calls main). This
22 # consists of the startfile, built from start.c and installed as crt0.o
23 # (traditionally) or crt1.o (for ELF). In ELF we also install crti.o and
24 # crtn.o, special "initializer" and "finalizer" files in used in the link
25 # to make the .init and .fini sections work right; both these files are
26 # built (in an arcane manner) from initfini.c.
31 csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.o)
32 extra-objs = start.o gmon-start.o \
33 $(start-installed-name) g$(start-installed-name) \
35 omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
37 install-lib = $(start-installed-name) g$(start-installed-name) \
39 distribute = initfini.c gmon-start.c start.c defs.awk abi-note.S
41 all: # Make this the default target; it will be defined in Rules.
46 before-compile = $(objpfx)abi-tag.h
49 ifeq ($(have-initfini),yes)
51 CPPFLAGS += -DHAVE_INITFINI
53 # These are the special initializer/finalizer files. They are always the
54 # first and last file in the link. crti.o ... crtn.o define the global
55 # "functions" _init and _fini to run the .init and .fini sections.
58 install-lib += $(crtstuff:=.o)
59 extra-objs += $(crtstuff:=.o)
60 generated += $(crtstuff:=.S) initfini.s defs.h
61 omit-deps += $(crtstuff)
63 # Special rules for the building of crti.o and crtn.o
64 $(objpfx)crt%.o: $(objpfx)crt%.S $(objpfx)defs.h
65 $(compile.S) -g0 $(ASFLAGS-.os) -o $@
67 CFLAGS-initfini.s = -O0 -g0 -fPIC
69 $(objpfx)initfini.s: initfini.c
70 $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
71 $(no-exceptions) -o $@
73 # We only have one kind of startup code files. Static binaries and
74 # shared libraries are build using the PIC version.
75 $(objpfx)crti.S: $(objpfx)initfini.s
76 sed -n -e '1,/@HEADER_ENDS/p' \
77 -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
78 -e '/@TRAILER_BEGINS/,$$p' $< > $@
80 $(objpfx)crtn.S: $(objpfx)initfini.s
81 sed -n -e '1,/@HEADER_ENDS/p' \
82 -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
83 -e '/@TRAILER_BEGINS/,$$p' $< > $@
85 $(objpfx)defs.h: $(objpfx)initfini.s
86 sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
92 extra-objs += abi-note.o
93 asm-CPPFLAGS += -I$(objpfx).
98 define link-relocatable
99 $(CC) -nostdlib -nostartfiles -r -o $@ $^
102 ifndef start-installed-name-rule
104 # We link the ELF startfile along with a SHT_NOTE section indicating
105 # the the kernel ABI the binaries linked with this library will require.
106 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o
109 # The startfile is installed under different names, so we just call our
110 # source file `start.c' and copy to the installed name after compiling.
111 $(objpfx)$(start-installed-name): $(objpfx)start.o
117 # The profiling startfile is made by linking together the normal
118 # startfile with gmon-start.o, which defines a constructor function
119 # to turn on profiling code at startup.
120 $(objpfx)g$(start-installed-name): $(objpfx)$(start-installed-name) \
121 $(objpfx)gmon-start.o
124 # These extra files are sometimes expected by system standard linking
125 # procedures, but we have nothing for them to do. So compile empty files.
126 $(addprefix $(objpfx),$(filter-out $(start-installed-name),$(csu-dummies))):
127 cp /dev/null $(@:.o=.c)
128 $(COMPILE.c) $(@:.o=.c) $(OUTPUT_OPTION)
132 $(objpfx)abi-tag.h: $(..)abi-tags
133 $(make-target-directory)
135 sed 's/#.*$//;/^[ ]*$$/d' $< | while read conf tag; do \
136 test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
137 : "$$conf"` != 0 || continue; \
138 echo "$$tag" | sed > $@.new \
139 's/[^0-9xXa-fA-F]/ /g;s/ *$//;s/ /,/g;s/^ */#define ABI_TAG /';\
141 if test -r $@.new; then mv -f $@.new $@; \
142 else echo >&2 'This configuration not matched in $<'; exit 1; fi