1 # Makefile for csu code for GNU C library.
3 # Copyright (C) 1995, 1996, 1997, 1998 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.
30 routines
= init-first libc-start
$(libc-init
) sysdep version
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 munch.awk \
40 abi-note.S init.c munch-tmpl.c
41 generated
= version-info.h
42 before-compile
= $(objpfx
)version-info.h
44 all: # Make this the default target; it will be defined in Rules.
49 before-compile
+= $(objpfx
)abi-tag.h
50 generated
+= abi-tag.h
56 libc-init
= munch-init
57 $(objpfx
)munch-init.c
: munch.awk munch-tmpl.c
$(+subdir_inits
)
58 $(AWK
) -f
$< subdirs
='$(+init_subdirs)' $(word 2,$^
) > $@
-t
60 generated
+= munch-init.c
62 # All initialization source files.
63 +subdir_inits
:= $(wildcard $(foreach dir,$(subdirs
),$(dir)/init-
$(dir).c
))
64 # All subdirectories containing initialization source files.
65 +init_subdirs
:= $(patsubst %/,%,$(dir $(+subdir_inits
)))
68 ifeq ($(have-initfini
),yes
)
70 CPPFLAGS
+= -DHAVE_INITFINI
72 # These are the special initializer/finalizer files. They are always the
73 # first and last file in the link. crti.o ... crtn.o define the global
74 # "functions" _init and _fini to run the .init and .fini sections.
77 install-lib
+= $(crtstuff
:=.o
)
78 extra-objs
+= $(crtstuff
:=.o
)
79 generated
+= $(crtstuff
:=.S
) initfini.s defs.h
80 omit-deps
+= $(crtstuff
)
82 # Special rules for the building of crti.o and crtn.o
83 $(objpfx
)crt
%.o
: $(objpfx
)crt
%.S
$(objpfx
)defs.h
84 $(compile.S
) -g0
$(ASFLAGS-.os
) -o
$@
86 CFLAGS-initfini.s
= -g0
-fPIC
-fno-inline-functions
88 $(objpfx
)initfini.s
: initfini.c
89 $(compile.c
) -S
$(CFLAGS-initfini.s
) -finhibit-size-directive \
90 $(no-exceptions
) -o
$@
92 # We only have one kind of startup code files. Static binaries and
93 # shared libraries are build using the PIC version.
94 $(objpfx
)crti.S
: $(objpfx
)initfini.s
95 sed
-n
-e
'1,/@HEADER_ENDS/p' \
96 -e
'/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
97 -e
'/@TRAILER_BEGINS/,$$p' $< > $@
99 $(objpfx
)crtn.S
: $(objpfx
)initfini.s
100 sed
-n
-e
'1,/@HEADER_ENDS/p' \
101 -e
'/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
102 -e
'/@TRAILER_BEGINS/,$$p' $< > $@
104 $(objpfx
)defs.h
: $(objpfx
)initfini.s
105 sed
-n
-e
'/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
106 $(AWK
) -f defs.awk
> $@
111 extra-objs
+= abi-note.o init.o
112 asm-CPPFLAGS
+= -I
$(objpfx
).
117 define link-relocatable
118 $(CC
) -nostdlib
-nostartfiles
-r
-o
$@
$^
121 ifndef start-installed-name-rule
123 # We link the ELF startfile along with a SHT_NOTE section indicating
124 # the kernel ABI the binaries linked with this library will require.
125 $(objpfx
)$(start-installed-name
): $(objpfx
)start.o
$(objpfx
)abi-note.o \
129 # The startfile is installed under different names, so we just call our
130 # source file `start.c' and copy to the installed name after compiling.
131 $(objpfx
)$(start-installed-name
): $(objpfx
)start.o
137 # The profiling startfile is made by linking together the normal
138 # startfile with gmon-start.o, which defines a constructor function
139 # to turn on profiling code at startup.
140 $(objpfx
)g
$(start-installed-name
): $(objpfx
)$(start-installed-name
) \
141 $(objpfx
)gmon-start.o
144 # These extra files are sometimes expected by system standard linking
145 # procedures, but we have nothing for them to do. So compile empty files.
146 $(addprefix $(objpfx
),$(filter-out $(start-installed-name
),$(csu-dummies
))):
147 cp
/dev
/null
$(@
:.o
=.c
)
148 $(COMPILE.c
) $(@
:.o
=.c
) $(OUTPUT_OPTION
)
151 # These headers are used by the startup code.
152 $(objpfx
)abi-tag.h
: $(..
)abi-tags
153 $(make-target-directory
)
155 sed
-e
's/#.*$$//' -e
'/^[ ]*$$/d' $< | \
156 while read conf tag
; do \
157 test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
158 : "$$conf"` != 0 || continue
; \
160 sed
-e
's/[^0-9xXa-fA-F]/ /g' -e
's/ *$$//' \
161 -e
's/ /,/g' -e
's/^ */#define ABI_TAG /' > $@.new
; \
163 if
test -r
$@.new
; then mv
-f
$@.new
$@
; \
164 else echo
>&2 'This configuration not matched in $<'; exit
1; fi
166 all-Banner-files
= $(wildcard $(addsuffix /Banner
, \
167 $(addprefix $(..
), $(subdirs
))))
168 $(objpfx
)version-info.h
: $(common-objpfx
)config.make
$(all-Banner-files
)
169 $(make-target-directory
)
170 (case
$(config-os
) in \
171 linux
*) version
=`(echo -e "#include <linux/version.h>\nUTS_RELEASE"\
173 sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
174 if
[ -z
"$$version" ]; then \
175 if
[ -r
/proc
/version
]; then \
176 version
=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
179 version
=`uname -r`; \
182 echo
-n
"\"Compiled on a Linux $$version system "; \
183 echo
"on `date +%Y-%m-%d`.\\n\"" ;; \
186 files
="$(all-Banner-files)"; \
187 if
test -n
"$$files"; then \
188 echo
"\"Available extensions:"; \
189 sed
-e
'/^#/d' -e
's/^[[:space:]]*/ /' $$files; \