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
$(start-installed-name
) \
39 distribute
= initfini.c gmon-start.c start.c defs.awk abi-note.S abi-tag.h
41 all: # Make this the default target; it will be defined in Rules.
46 ifeq ($(have-initfini
),yes
)
48 CPPFLAGS
+= -DHAVE_INITFINI
50 # These are the special initializer/finalizer files. They are always the
51 # first and last file in the link. crti.o ... crtn.o define the global
52 # "functions" _init and _fini to run the .init and .fini sections.
55 install-lib
+= $(crtstuff
:=.o
)
56 extra-objs
+= $(crtstuff
:=.o
)
57 generated
+= $(crtstuff
:=.S
) initfini.s align.h end.h
58 omit-deps
+= $(crtstuff
)
60 # Special rules for the building of crti.o and crtn.o
61 $(objpfx
)crt
%.o
: $(objpfx
)crt
%.S
$(objpfx
)defs.h
62 $(compile.S
) -g0
$(ASFLAGS-.so
) -o
$@
64 $(objpfx
)initfini.s
: initfini.c
65 $(compile.c
) -g0
-S
-fPIC
-finhibit-size-directive \
66 $(no-exceptions
) -o
$@
68 # We only have one kind of startup code files. Static binaries and
69 # shared libraries are build using the PIC version.
70 $(objpfx
)crti.S
: $(objpfx
)initfini.s
71 sed
-n
-e
'1,/@HEADER_ENDS/p' \
72 -e
'/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
73 -e
'/@TRAILER_BEGINS/,$$p' $< > $@
75 $(objpfx
)crtn.S
: $(objpfx
)initfini.s
76 sed
-n
-e
'1,/@HEADER_ENDS/p' \
77 -e
'/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
78 -e
'/@TRAILER_BEGINS/,$$p' $< > $@
80 $(objpfx
)defs.h
: $(objpfx
)initfini.s
81 sed
-n
-e
'/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
87 extra-objs
+= abi-note.o
92 define link-relocatable
93 $(CC
) -nostdlib
-nostartfiles
-r
-o
$@
$^
96 ifndef start-installed-name-rule
98 # We link the ELF startfile along with a SHT_NOTE section indicating
99 # the the kernel ABI the binaries linked with this library will require.
100 $(objpfx
)$(start-installed-name
): $(objpfx
)start.o
$(objpfx
)abi-note.o
103 # The startfile is installed under different names, so we just call our
104 # source file `start.c' and copy to the installed name after compiling.
105 $(objpfx
)$(start-installed-name
): $(objpfx
)start.o
111 # The profiling startfile is made by linking together the normal
112 # startfile with gmon-start.o, which defines a constructor function
113 # to turn on profiling code at startup.
114 $(objpfx
)g
$(start-installed-name
): $(objpfx
)$(start-installed-name
) \
115 $(objpfx
)gmon-start.o
118 # These extra files are sometimes expected by system standard linking
119 # procedures, but we have nothing for them to do. So compile empty files.
120 $(addprefix $(objpfx
),$(filter-out $(start-installed-name
),$(csu-dummies
))):
121 cp
/dev
/null
$(@
:.o
=.c
)
122 $(COMPILE.c
) $(@
:.o
=.c
) $(OUTPUT_OPTION
)