1 # Makefile for csu code for GNU C library.
2 # Copyright (C) 1995-2014 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, see
17 # <http://www.gnu.org/licenses/>.
19 # This directory contains the C startup code (that which calls main). This
20 # consists of the startfile, built from start.c and installed as crt0.o
21 # (traditionally) or crt1.o (for ELF). In ELF we also install crti.o and
22 # crtn.o, special "initializer" and "finalizer" files used in the link
23 # to make the .init and .fini sections work right.
29 routines
= init-first libc-start
$(libc-init
) sysdep version check_fds \
30 libc-tls elf-init dso_handle
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 S
$(start-installed-name
)
38 omit-deps
= $(patsubst %.o
,%,$(start-installed-name
) g
$(start-installed-name
) \
39 b
$(start-installed-name
) $(csu-dummies
) \
40 S
$(start-installed-name
))
41 install-lib
= $(start-installed-name
) g
$(start-installed-name
) $(csu-dummies
)
42 generated
+= version-info.h
43 before-compile
+= $(objpfx
)version-info.h
45 tests
:= tst-empty tst-atomic tst-atomic-long
46 tests-static
:= tst-empty
48 ifeq (yes
,$(build-shared
))
49 extra-objs
+= S
$(start-installed-name
)
50 install-lib
+= S
$(start-installed-name
)
54 ifneq ($(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
)
61 before-compile
+= $(objpfx
)abi-tag.h
62 generated
+= abi-tag.h
64 # These are the special initializer/finalizer files. They are always the
65 # first and last file in the link. crti.o ... crtn.o define the global
66 # "functions" _init and _fini to run the .init and .fini sections.
69 install-lib
+= $(crtstuff
:=.o
)
70 extra-objs
+= $(crtstuff
:=.o
)
72 extra-objs
+= abi-note.o init.o
73 asm-CPPFLAGS
+= -I
$(objpfx
).
77 # Make these in the lib pass so they're available in time to link things with.
78 subdir_lib
: $(extra-objs
:%=$(objpfx
)%)
80 define link-relocatable
81 $(CC
) -nostdlib
-nostartfiles
-r
-o
$@
$^
84 ifndef start-installed-name-rule
85 # We link the ELF startfile along with a SHT_NOTE section indicating
86 # the kernel ABI the binaries linked with this library will require.
87 $(objpfx
)$(start-installed-name
): $(objpfx
)start.o
$(objpfx
)abi-note.o \
90 $(objpfx
)S
$(start-installed-name
): $(objpfx
)start.os
$(objpfx
)abi-note.o \
95 # The profiling startfile is made by linking together the normal
96 # startfile with gmon-start.o, which defines a constructor function
97 # to turn on profiling code at startup.
98 $(addprefix $(objpfx
),$(sort g
$(start-installed-name
) \
99 g
$(static-start-installed-name
))): \
100 $(objpfx
)g
%: $(objpfx
)% $(objpfx
)gmon-start.o
103 # These extra files are sometimes expected by system standard linking
104 # procedures, but we have nothing for them to do. So compile empty files.
105 $(addprefix $(objpfx
),$(filter-out $(start-installed-name
), $(csu-dummies
))):\
107 $(COMPILE.c
) -o
$@
-x c
/dev
/null
109 # These headers are used by the startup code.
110 $(objpfx
)abi-tag.h
: $(..
)abi-tags
111 $(make-target-directory
)
113 sed
-e
's/#.*$$//' -e
'/^[ ]*$$/d' $< | \
114 while read conf tagos tagver
; do \
115 test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
116 : "$$conf"` != 0 || continue
; \
118 sed
-e
's/[^0-9xXa-fA-F ]//' \
119 -e
's/^/#define __ABI_TAG_OS /'; \
120 echo
"#ifndef __ABI_TAG_VERSION"; \
122 sed
-e
's/[^0-9xXa-fA-F]/ /g' -e
's/ *$$//' \
123 -e
's/ /,/g' -e
's/^/# define __ABI_TAG_VERSION /'; \
124 echo
"#endif" ) > $@.new
; \
126 if
test -r
$@.new
; then mv
-f
$@.new
$@
; \
127 else echo
>&2 'This configuration not matched in $<'; exit
1; fi
129 all-Banner-files
= $(wildcard $(addsuffix /Banner
,\
130 $(sort $(subdir-srcdirs
) \
131 $(sysdeps-srcdirs
))))
132 $(objpfx
)version-info.h
: $(common-objpfx
)config.make
$(all-Banner-files
)
133 $(make-target-directory
)
134 (files
="$(all-Banner-files)"; \
135 if
test -n
"$$files"; then \
136 printf
'"Available extensions:\\n"\n'; \
137 sed
-e
'/^#/d' -e
's/^[[:space:]]*/ /' \
138 -e
's/^\(.*\)$$/\"\1\\n\"/' $$files; \