Fix concurrent changes on nscd aware files (BZ #23178)
[glibc.git] / csu / Makefile
blobf3498960f89e3b31f7cda6969e6eb3393a305241
1 # Makefile for csu code for GNU C library.
2 # Copyright (C) 1995-2018 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.
25 subdir := csu
27 include ../Makeconfig
29 routines = init-first libc-start $(libc-init) sysdep version check_fds \
30 libc-tls elf-init dso_handle
31 aux = errno
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 \
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 r$(start-installed-name) \
42 gr$(start-installed-name))
43 install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
45 # No tests are allowed in the csu/ subdirectory because the startup
46 # code is compiled with special flags.
47 tests =
49 CFLAGS-.o += $(no-stack-protector)
50 CFLAGS-.op += $(no-stack-protector)
51 CFLAGS-.os += $(no-stack-protector)
53 ifeq (yes,$(build-shared))
54 extra-objs += S$(start-installed-name) gmon-start.os
55 ifneq ($(start-installed-name),$(static-start-installed-name))
56 extra-objs += gmon-start.o
57 endif
58 install-lib += S$(start-installed-name)
59 generated += start.os
60 else
61 extra-objs += gmon-start.o
62 endif
64 ifneq ($(start-installed-name),$(static-start-installed-name))
65 # FIXME: Only Hurd defines static-start-installed-name. Hurd needs to
66 # provide special rules to support static PIE.
67 extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
68 omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
69 g$(static-start-installed-name))
70 install-lib += $(static-start-installed-name) g$(static-start-installed-name)
71 else
72 ifeq (yes,$(enable-static-pie))
73 extra-objs += r$(start-installed-name) gr$(start-installed-name)
74 install-lib += r$(start-installed-name) gr$(start-installed-name)
75 endif
76 endif
78 before-compile += $(objpfx)abi-tag.h
79 generated += abi-tag.h
81 # These are the special initializer/finalizer files. They are always the
82 # first and last file in the link. crti.o ... crtn.o define the global
83 # "functions" _init and _fini to run the .init and .fini sections.
84 crtstuff = crti crtn
86 install-lib += $(crtstuff:=.o)
87 extra-objs += $(crtstuff:=.o)
89 ifneq ($(multidir),.)
90 multilib-extra-objs = $(addprefix $(multidir)/, $(install-lib))
91 extra-objs += $(multilib-extra-objs)
92 endif
94 extra-objs += abi-note.o init.o static-reloc.o
95 ifeq (yes,$(build-shared))
96 extra-objs += static-reloc.os
97 endif
98 asm-CPPFLAGS += -I$(objpfx).
100 # Enable unwinding so backtrace unwinds to __libc_start_main
101 CFLAGS-libc-start.c += -funwind-tables
103 include ../Rules
105 # Make these in the lib pass so they're available in time to link things with.
106 subdir_lib: $(extra-objs:%=$(objpfx)%)
108 define link-relocatable
109 $(CC) -nostdlib -nostartfiles -r -o $@ $^
110 endef
112 ifndef start-installed-name-rule
113 # We link the ELF startfile along with a SHT_NOTE section indicating
114 # the kernel ABI the binaries linked with this library will require.
115 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
116 $(objpfx)init.o $(objpfx)static-reloc.o
117 $(link-relocatable)
118 $(objpfx)r$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
119 $(objpfx)init.o
120 $(link-relocatable)
121 $(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \
122 $(objpfx)init.o
123 $(link-relocatable)
124 endif
126 # The profiling startfile is made by linking together the normal
127 # startfile with gmon-start.o, which defines a constructor function
128 # to turn on profiling code at startup.
129 ifeq (yes,$(build-shared))
130 $(objpfx)g$(start-installed-name): \
131 $(objpfx)g%: $(objpfx)S% $(objpfx)gmon-start.os $(objpfx)static-reloc.os
132 $(link-relocatable)
133 $(objpfx)gr$(start-installed-name): \
134 $(objpfx)gr%: $(objpfx)r% $(objpfx)gmon-start.o
135 $(link-relocatable)
136 ifneq ($(start-installed-name),$(static-start-installed-name))
137 $(objpfx)g$(static-start-installed-name): \
138 $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
139 $(link-relocatable)
140 endif
141 else
142 $(addprefix $(objpfx),$(sort g$(start-installed-name) \
143 g$(static-start-installed-name))): \
144 $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
145 $(link-relocatable)
146 endif
148 # These extra files are sometimes expected by system standard linking
149 # procedures, but we have nothing for them to do. So compile empty files.
150 $(addprefix $(objpfx),$(filter-out $(start-installed-name), $(csu-dummies))):\
151 $(before-compile)
152 $(COMPILE.c) -o $@ -x c /dev/null
154 # These headers are used by the startup code.
155 $(objpfx)abi-tag.h: $(..)abi-tags
156 $(make-target-directory)
157 rm -f $@.new
158 sed -e 's/#.*$$//' -e '/^[ ]*$$/d' $< | \
159 while read conf tagos tagver; do \
160 test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
161 : "$$conf"` != 0 || continue; \
162 ( echo "$$tagos" | \
163 sed -e 's/[^0-9xXa-fA-F ]//' \
164 -e 's/^/#define __ABI_TAG_OS /'; \
165 echo "#ifndef __ABI_TAG_VERSION"; \
166 echo "$$tagver" | \
167 sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
168 -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
169 echo "#endif" ) > $@.new; \
170 done
171 if test -r $@.new; then mv -f $@.new $@; \
172 else echo >&2 'This configuration not matched in $<'; exit 1; fi
174 ifneq ($(multidir),.)
175 $(addprefix $(objpfx)$(multidir)/, $(install-lib)): $(addprefix $(objpfx), $(install-lib))
176 $(make-link-multidir)
177 endif