1 # Makefile for csu code for GNU C library.
2 # Copyright (C) 1995,96,97,98,99,2000,01,2002 Free Software Foundation, Inc.
3 # This file is part of the GNU C Library.
5 # The GNU C Library is free software; you can redistribute it and/or
6 # modify it under the terms of the GNU Lesser General Public
7 # License as published by the Free Software Foundation; either
8 # version 2.1 of the License, or (at your option) any later version.
10 # The GNU C Library is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 # Lesser General Public License for more details.
15 # You should have received a copy of the GNU Lesser General Public
16 # License along with the GNU C Library; if not, write to the Free
17 # Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 # This directory contains the C startup code (that which calls main). This
21 # consists of the startfile, built from start.c and installed as crt0.o
22 # (traditionally) or crt1.o (for ELF). In ELF we also install crti.o and
23 # crtn.o, special "initializer" and "finalizer" files used in the link
24 # to make the .init and .fini sections work right; both these files are
25 # built (in an arcane manner) from initfini.c.
29 routines
= init-first libc-start
$(libc-init
) sysdep version check_fds \
32 elide-routines.os
= libc-tls
33 static-only-routines
= elf-init
34 csu-dummies
= $(filter-out $(start-installed-name
),crt1.o Mcrt1.o
)
35 extra-objs
= start.o gmon-start.o \
36 $(start-installed-name
) g
$(start-installed-name
) $(csu-dummies
)
37 omit-deps
= $(patsubst %.o
,%,$(start-installed-name
) g
$(start-installed-name
) \
38 b
$(start-installed-name
) $(csu-dummies
))
39 install-lib
= $(start-installed-name
) g
$(start-installed-name
) $(csu-dummies
)
40 distribute
= initfini.c gmon-start.c start.c defs.awk munch.awk \
41 abi-note.S init.c munch-tmpl.c
42 generated
= version-info.h
43 before-compile
= $(objpfx
)version-info.h
45 all: # Make this the default target; it will be defined in Rules.
49 ifeq (yes
,$(build-bounded
))
50 extra-objs
+= b
$(start-installed-name
)
51 install-lib
+= b
$(start-installed-name
)
54 ifneq ($(start-installed-name
),$(static-start-installed-name
))
55 extra-objs
+= $(static-start-installed-name
) g
$(static-start-installed-name
)
56 omit-deps
+= $(patsubst %.o
,%,$(static-start-installed-name
) \
57 g
$(static-start-installed-name
))
58 install-lib
+= $(static-start-installed-name
) g
$(static-start-installed-name
)
62 before-compile
+= $(objpfx
)abi-tag.h
63 generated
+= abi-tag.h
67 libc-init
= munch-init
68 $(objpfx
)munch-init.c
: munch.awk munch-tmpl.c
$(+subdir_inits
)
69 $(AWK
) -f
$< subdirs
='$(+init_subdirs)' $(word 2,$^
) > $@
-t
71 generated
+= munch-init.c
73 # All initialization source files.
74 +subdir_inits
:= $(wildcard $(foreach dir,$(subdirs
),$(dir)/init-
$(dir).c
))
75 # All subdirectories containing initialization source files.
76 +init_subdirs
:= $(patsubst %/,%,$(dir $(+subdir_inits
)))
79 ifeq ($(have-initfini
),yes
)
81 CPPFLAGS
+= -DHAVE_INITFINI
83 # These are the special initializer/finalizer files. They are always the
84 # first and last file in the link. crti.o ... crtn.o define the global
85 # "functions" _init and _fini to run the .init and .fini sections.
88 install-lib
+= $(crtstuff
:=.o
)
89 extra-objs
+= $(crtstuff
:=.o
)
90 generated
+= $(crtstuff
:=.S
) initfini.s defs.h
91 omit-deps
+= $(crtstuff
)
93 # Special rules for the building of crti.o and crtn.o
94 $(objpfx
)crt
%.o
: $(objpfx
)crt
%.S
$(objpfx
)defs.h
95 $(compile.S
) -g0
$(ASFLAGS-.os
) -o
$@
97 CFLAGS-initfini.s
= -g0
-fPIC
-fno-inline-functions
99 vpath initfini.c
$(full_config_sysdirs
)
101 $(objpfx
)initfini.s
: initfini.c
102 $(compile.c
) -S
$(CFLAGS-initfini.s
) -finhibit-size-directive \
103 $(patsubst -f
%,-fno-
%,$(exceptions
)) -o
$@
105 # We only have one kind of startup code files. Static binaries and
106 # shared libraries are build using the PIC version.
107 $(objpfx
)crti.S
: $(objpfx
)initfini.s
108 sed
-n
-e
'1,/@HEADER_ENDS/p' \
109 -e
'/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
110 -e
'/@TRAILER_BEGINS/,$$p' $< > $@
112 $(objpfx
)crtn.S
: $(objpfx
)initfini.s
113 sed
-n
-e
'1,/@HEADER_ENDS/p' \
114 -e
'/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
115 -e
'/@TRAILER_BEGINS/,$$p' $< > $@
117 # These explicit rules are necessary when the $(objpfx) subdirectory
118 # did not exist at the time make considered the implicit rules using it.
119 # This comes up with a fresh build using no_deps=t.
120 $(patsubst %,$(objpfx
)crt
%.o
,i n
): %.o
: %.S
122 $(objpfx
)defs.h
: $(objpfx
)initfini.s
123 sed
-n
-e
'/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
124 $(AWK
) -f defs.awk
> $@
129 extra-objs
+= abi-note.o init.o
130 asm-CPPFLAGS
+= -I
$(objpfx
).
135 # Make these in the lib pass so they're available in time to link things with.
136 subdir_lib
: $(extra-objs
:%=$(objpfx
)%)
138 define link-relocatable
139 $(CC
) -nostdlib
-nostartfiles
-r
-o
$@
$^
142 # We don't want this compiled with PIC.
143 # It's never included in shared libraries, unlike the rest of libc_nonshared.a.
144 $(objpfx
)elf-init.oS
: $(objpfx
)elf-init.o
147 ifndef start-installed-name-rule
149 # We link the ELF startfile along with a SHT_NOTE section indicating
150 # the kernel ABI the binaries linked with this library will require.
151 $(objpfx
)$(start-installed-name
): $(objpfx
)start.o
$(objpfx
)abi-note.o \
154 $(objpfx
)b
$(start-installed-name
): $(objpfx
)start.ob
$(objpfx
)abi-note.ob \
158 # The startfile is installed under different names, so we just call our
159 # source file `start.c' and copy to the installed name after compiling.
160 $(objpfx
)$(start-installed-name
): $(objpfx
)start.o
163 $(objpfx
)b
$(start-installed-name
): $(objpfx
)start.ob
169 # The profiling startfile is made by linking together the normal
170 # startfile with gmon-start.o, which defines a constructor function
171 # to turn on profiling code at startup.
172 $(addprefix $(objpfx
),$(sort g
$(start-installed-name
) \
173 g
$(static-start-installed-name
))): \
174 $(objpfx
)g
%: $(objpfx
)% $(objpfx
)gmon-start.o
177 # These extra files are sometimes expected by system standard linking
178 # procedures, but we have nothing for them to do. So compile empty files.
179 $(addprefix $(objpfx
),$(filter-out $(start-installed-name
),$(csu-dummies
))):
182 $(COMPILE.c
) $(@
:.o
=.c
) $(OUTPUT_OPTION
)
185 # These headers are used by the startup code.
186 $(objpfx
)abi-tag.h
: $(..
)abi-tags
187 $(make-target-directory
)
189 sed
-e
's/#.*$$//' -e
'/^[ ]*$$/d' $< | \
190 while read conf tagos tagver
; do \
191 test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
192 : "$$conf"` != 0 || continue
; \
194 sed
-e
's/[^0-9xXa-fA-F ]//' \
195 -e
's/^/#define __ABI_TAG_OS /'; \
196 echo
"#ifndef __ABI_TAG_VERSION"; \
198 sed
-e
's/[^0-9xXa-fA-F]/ /g' -e
's/ *$$//' \
199 -e
's/ /,/g' -e
's/^/# define __ABI_TAG_VERSION /'; \
200 echo
"#endif" ) > $@.new
; \
202 if
test -r
$@.new
; then mv
-f
$@.new
$@
; \
203 else echo
>&2 'This configuration not matched in $<'; exit
1; fi
205 all-Banner-files
= $(wildcard $(addsuffix /Banner
, \
206 $(addprefix $(..
), $(subdirs
))))
207 $(objpfx
)version-info.h
: $(common-objpfx
)config.make
$(all-Banner-files
)
208 $(make-target-directory
)
209 (case
$(config-os
) in \
210 linux
*) version
=`(echo -e "#include <linux/version.h>\nUTS_RELEASE"\
212 sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
213 if
[ -z
"$$version" ]; then \
214 if
[ -r
/proc
/version
]; then \
215 version
=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
218 version
=`uname -r`; \
221 os
=`uname -s 2> /dev/null`; \
222 if
[ -z
"$$os" ]; then \
225 echo
"\"Compiled on a $$os $$version system" \
226 "on `date +%Y-%m-%d`.\\n\"" ;; \
229 files
="$(all-Banner-files)"; \
230 if
test -n
"$$files"; then \
231 echo
"\"Available extensions:\\n\""; \
232 sed
-e
'/^#/d' -e
's/^[[:space:]]*/ /' \
233 -e
's/\(^.*$$\)/\"\1\\n\"/' $$files; \