summary refs log tree commit diff
path: root/csu/Makefile
blob: d1899ad3e2ff041d46c6eed26af2214c0cdb2a25 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
# Makefile for csu code for GNU C library.
# Copyright (C) 1995,96,97,98,99,2000,01,02,2003 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 Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 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
# Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; 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 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 libc-start $(libc-init) sysdep version check_fds \
	   libc-tls elf-init dso_handle
aux	 = errno
elide-routines.os = libc-tls
static-only-routines = elf-init
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$(start-installed-name) \
			      b$(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 munch.awk \
	     abi-note.S init.c munch-tmpl.c not-cancel.h
generated = version-info.h
before-compile = $(objpfx)version-info.h

tests := tst-empty tst-atomic tst-atomic-long
tests-static := tst-empty

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

include ../Makeconfig

ifeq (yes,$(build-bounded))
extra-objs += b$(start-installed-name)
install-lib += b$(start-installed-name)
endif

ifneq ($(start-installed-name),$(static-start-installed-name))
extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
			     g$(static-start-installed-name))
install-lib += $(static-start-installed-name) g$(static-start-installed-name)
endif

ifeq (yes,$(elf))
before-compile += $(objpfx)abi-tag.h
generated += abi-tag.h
endif

ifneq (yes,$(gnu-ld))
libc-init = munch-init
$(objpfx)munch-init.c: munch.awk munch-tmpl.c $(+subdir_inits)
	$(AWK) -f $< subdirs='$(+init_subdirs)' $(word 2,$^) > $@-t
	mv -f $@-t $@
generated += munch-init.c

# All initialization source files.
+subdir_inits	:= $(wildcard $(foreach dir,$(subdirs),$(dir)/init-$(dir).c))
# All subdirectories containing initialization source files.
+init_subdirs	:= $(patsubst %/,%,$(dir $(+subdir_inits)))
endif

ifeq ($(have-initfini),yes)

CPPFLAGS += -DHAVE_INITFINI

# We don't want this compiled with PIC.
# It's never included in shared libraries, unlike the rest of libc_nonshared.a.
CPPFLAGS-elf-init.oS = $(patsubst %,-UPIC,$(pic-ccflag))
CFLAGS-elf-init.oS = $(patsubst -f%,-fno-%,$(pic-ccflag))

# 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 defs.h
omit-deps += $(crtstuff)

# Special rules for the building of crti.o and crtn.o
$(crtstuff:%=$(objpfx)%.o): %.o: %.S $(objpfx)defs.h
	$(compile.S) -g0 $(ASFLAGS-.os) -o $@

CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions

vpath initfini.c $(full_config_sysdirs)

$(objpfx)initfini.s: initfini.c $(before-compile)
	$(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
		$(patsubst -f%,-fno-%,$(exceptions)) -o $@

# We only have one kind of startup code files.	Static binaries and
# shared libraries are build using the PIC version.
$(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' $< > $@

# These explicit rules are necessary when the $(objpfx) subdirectory
# did not exist at the time make considered the implicit rules using it.
# This comes up with a fresh build using no_deps=t.
$(patsubst %,$(objpfx)crt%.o,i n): %.o: %.S

$(objpfx)defs.h: $(objpfx)initfini.s
	sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
		$(AWK) -f defs.awk > $@

endif

ifeq (yes,$(elf))
extra-objs += abi-note.o init.o
asm-CPPFLAGS += -I$(objpfx).
endif

include ../Rules

# Make these in the lib pass so they're available in time to link things with.
subdir_lib: $(extra-objs:%=$(objpfx)%)

define link-relocatable
$(CC) -nostdlib -nostartfiles -r -o $@ $^
endef

ifndef start-installed-name-rule
ifeq (yes,$(elf))
# We link the ELF startfile along with a SHT_NOTE section indicating
# the kernel ABI the binaries linked with this library will require.
$(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
				  $(objpfx)init.o
	$(link-relocatable)
$(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \
				  $(objpfx)init.ob
	$(link-relocatable)
else
# 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 $< $@
$(objpfx)b$(start-installed-name): $(objpfx)start.ob
	rm -f $@
	ln $< $@
endif
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.
$(addprefix $(objpfx),$(sort g$(start-installed-name) \
			     g$(static-start-installed-name))): \
  $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
	$(link-relocatable)

# 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))):\
  $(before-compile)
	$(COMPILE.c) -o $@ -x c /dev/null

# These headers are used by the startup code.
$(objpfx)abi-tag.h: $(..)abi-tags
	$(make-target-directory)
	rm -f $@.new
	sed -e 's/#.*$$//' -e '/^[	]*$$/d' $< | \
	while read conf tagos tagver; do \
	  test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
		     : "$$conf"` != 0 || continue; \
	  ( echo "$$tagos" | \
	    sed -e 's/[^0-9xXa-fA-F 	]//' \
		-e 's/^/#define __ABI_TAG_OS /'; \
	    echo "#ifndef __ABI_TAG_VERSION"; \
	    echo "$$tagver" | \
	    sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
	      -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
	    echo "#endif" ) > $@.new; \
	done
	if test -r $@.new; then mv -f $@.new $@; \
	else echo >&2 'This configuration not matched in $<'; exit 1; fi

all-Banner-files = $(wildcard $(addsuffix /Banner, \
					$(addprefix $(..), $(subdirs))))
$(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
	$(make-target-directory)
	(case $(config-os) in \
	   linux*) version=`(echo -e "#include <linux/version.h>\nUTS_RELEASE"\
			     | $(CC) -E -P - | \
			     sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
		   if [ -z "$$version" ]; then \
		     if [ -r /proc/version ]; then \
		       version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
				< /proc/version`; \
		     else \
		       version=`uname -r`; \
		     fi; \
		   fi; \
		   os=`uname -s 2> /dev/null`; \
		   if [ -z "$$os" ]; then \
		     os=Linux; \
		   fi; \
		   echo "\"Compiled on a $$os $$version system" \
			"on `date +%Y-%m-%d`.\\n\"" ;; \
	   *) ;; \
	 esac; \
	 files="$(all-Banner-files)";				\
	 if test -n "$$files"; then				\
	   echo "\"Available extensions:\\n\"";			\
	   sed -e '/^#/d' -e 's/^[[:space:]]*/	/'		\
	       -e 's/\(^.*$$\)/\"\1\\n\"/' $$files;		\
	 fi) > $@T
	mv -f $@T $@