| 1 | # Makefile for csu code for GNU C library.
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| 2 | # Copyright (C) 1995-2004, 2005 Free Software Foundation, Inc.
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| 3 | # This file is part of the GNU C Library.
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| 4 |
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| 5 | # The GNU C Library is free software; you can redistribute it and/or
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| 6 | # modify it under the terms of the GNU Lesser General Public
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| 7 | # License as published by the Free Software Foundation; either
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| 8 | # version 2.1 of the License, or (at your option) any later version.
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| 9 |
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| 10 | # The GNU C Library is distributed in the hope that it will be useful,
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| 11 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | # Lesser General Public License for more details.
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| 14 |
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| 15 | # You should have received a copy of the GNU Lesser General Public
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| 16 | # License along with the GNU C Library; if not, write to the Free
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| 17 | # Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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| 18 | # 02111-1307 USA.
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| 19 |
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| 20 | # This directory contains the C startup code (that which calls main). This
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| 21 | # consists of the startfile, built from start.c and installed as crt0.o
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| 22 | # (traditionally) or crt1.o (for ELF). In ELF we also install crti.o and
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| 23 | # crtn.o, special "initializer" and "finalizer" files used in the link
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| 24 | # to make the .init and .fini sections work right; both these files are
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| 25 | # built (in an arcane manner) from initfini.c.
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| 26 |
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| 27 | subdir := csu
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| 28 |
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| 29 | routines = init-first libc-start $(libc-init) sysdep version check_fds \
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| 30 | libc-tls elf-init dso_handle
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| 31 | aux = errno
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| 32 | elide-routines.os = libc-tls
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| 33 | static-only-routines = elf-init
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| 34 | csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.o)
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| 35 | extra-objs = start.o gmon-start.o \
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| 36 | $(start-installed-name) g$(start-installed-name) $(csu-dummies) \
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| 37 | S$(start-installed-name)
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| 38 | omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
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| 39 | b$(start-installed-name) $(csu-dummies) \
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| 40 | S$(start-installed-name))
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| 41 | install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
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| 42 | distribute = initfini.c gmon-start.c start.c defs.awk munch.awk \
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| 43 | abi-note.S init.c munch-tmpl.c not-cancel.h
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| 44 | generated = version-info.h
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| 45 | before-compile = $(objpfx)version-info.h
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| 46 |
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| 47 | tests := tst-empty tst-atomic tst-atomic-long
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| 48 | tests-static := tst-empty
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| 49 |
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| 50 | all: # Make this the default target; it will be defined in Rules.
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| 51 |
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| 52 | include ../Makeconfig
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| 53 |
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| 54 | ifeq (yes,$(build-shared))
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| 55 | extra-objs += S$(start-installed-name)
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| 56 | install-lib += S$(start-installed-name)
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| 57 | generated += start.os
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| 58 | endif
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| 59 |
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| 60 | ifeq (yes,$(build-bounded))
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| 61 | extra-objs += b$(start-installed-name)
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| 62 | install-lib += b$(start-installed-name)
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| 63 | generated += start.ob
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| 64 | endif
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| 65 |
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| 66 | ifneq ($(start-installed-name),$(static-start-installed-name))
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| 67 | extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
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| 68 | omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
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| 69 | g$(static-start-installed-name))
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| 70 | install-lib += $(static-start-installed-name) g$(static-start-installed-name)
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| 71 | endif
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| 72 |
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| 73 | ifeq (yes,$(elf))
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| 74 | before-compile += $(objpfx)abi-tag.h
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| 75 | generated += abi-tag.h
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| 76 | endif
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| 77 |
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| 78 | ifneq (yes,$(gnu-ld))
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| 79 | libc-init = munch-init
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| 80 | $(objpfx)munch-init.c: munch.awk munch-tmpl.c $(+subdir_inits)
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| 81 | $(AWK) -f $< subdirs='$(+init_subdirs)' $(word 2,$^) > $@-t
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| 82 | mv -f $@-t $@
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| 83 | generated += munch-init.c
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| 84 |
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| 85 | # All initialization source files.
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| 86 | +subdir_inits := $(wildcard $(foreach dir,$(subdirs),$(dir)/init-$(dir).c))
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| 87 | # All subdirectories containing initialization source files.
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| 88 | +init_subdirs := $(patsubst %/,%,$(dir $(+subdir_inits)))
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| 89 | endif
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| 90 |
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| 91 | ifeq ($(have-initfini),yes)
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| 92 |
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| 93 | CPPFLAGS += -DHAVE_INITFINI
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| 94 |
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| 95 | # These are the special initializer/finalizer files. They are always the
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| 96 | # first and last file in the link. crti.o ... crtn.o define the global
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| 97 | # "functions" _init and _fini to run the .init and .fini sections.
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| 98 | crtstuff = crti crtn
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| 99 |
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| 100 | install-lib += $(crtstuff:=.o)
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| 101 | extra-objs += $(crtstuff:=.o)
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| 102 | generated += $(crtstuff:=.S) initfini.s defs.h
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| 103 | omit-deps += $(crtstuff)
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| 104 |
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| 105 | # Special rules for the building of crti.o and crtn.o
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| 106 | $(crtstuff:%=$(objpfx)%.o): %.o: %.S $(objpfx)defs.h
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| 107 | $(compile.S) -g0 $(ASFLAGS-.os) -o $@
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| 108 |
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| 109 | CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions $(fno-unit-at-a-time)
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| 110 |
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| 111 | vpath initfini.c $(full_config_sysdirs)
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| 112 |
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| 113 | $(objpfx)initfini.s: initfini.c $(before-compile)
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| 114 | $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
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| 115 | $(patsubst -f%,-fno-%,$(exceptions)) -o $@
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| 116 |
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| 117 | # We only have one kind of startup code files. Static binaries and
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| 118 | # shared libraries are build using the PIC version.
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| 119 | $(objpfx)crti.S: $(objpfx)initfini.s
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| 120 | sed -n -e '1,/@HEADER_ENDS/p' \
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| 121 | -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
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| 122 | -e '/@TRAILER_BEGINS/,$$p' $< > $@
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| 123 |
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| 124 | $(objpfx)crtn.S: $(objpfx)initfini.s
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| 125 | sed -n -e '1,/@HEADER_ENDS/p' \
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| 126 | -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
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| 127 | -e '/@TRAILER_BEGINS/,$$p' $< > $@
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| 128 |
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| 129 | # These explicit rules are necessary when the $(objpfx) subdirectory
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| 130 | # did not exist at the time make considered the implicit rules using it.
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| 131 | # This comes up with a fresh build using no_deps=t.
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| 132 | $(patsubst %,$(objpfx)crt%.o,i n): %.o: %.S
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| 133 |
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| 134 | $(objpfx)defs.h: $(objpfx)initfini.s
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| 135 | sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
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| 136 | $(AWK) -f defs.awk > $@
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| 137 |
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| 138 | endif
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| 139 |
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| 140 | ifeq (yes,$(elf))
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| 141 | extra-objs += abi-note.o init.o
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| 142 | asm-CPPFLAGS += -I$(objpfx).
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| 143 | endif
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| 144 |
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| 145 | include ../Rules
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| 146 |
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| 147 | # Make these in the lib pass so they're available in time to link things with.
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| 148 | subdir_lib: $(extra-objs:%=$(objpfx)%)
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| 149 |
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| 150 | define link-relocatable
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| 151 | $(CC) -nostdlib -nostartfiles -r -o $@ $^
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| 152 | endef
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| 153 |
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| 154 | ifndef start-installed-name-rule
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| 155 | ifeq (yes,$(elf))
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| 156 | # We link the ELF startfile along with a SHT_NOTE section indicating
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| 157 | # the kernel ABI the binaries linked with this library will require.
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| 158 | $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
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| 159 | $(objpfx)init.o
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| 160 | $(link-relocatable)
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| 161 | $(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \
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| 162 | $(objpfx)init.o
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| 163 | $(link-relocatable)
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| 164 | $(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \
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| 165 | $(objpfx)init.ob
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| 166 | $(link-relocatable)
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| 167 | else
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| 168 | # The startfile is installed under different names, so we just call our
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| 169 | # source file `start.c' and copy to the installed name after compiling.
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| 170 | $(objpfx)$(start-installed-name): $(objpfx)start.o
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| 171 | rm -f $@
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| 172 | ln $< $@
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| 173 | $(objpfx)S$(start-installed-name): $(objpfx)start.os
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| 174 | rm -f $@
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| 175 | ln $< $@
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| 176 | $(objpfx)b$(start-installed-name): $(objpfx)start.ob
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| 177 | rm -f $@
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| 178 | ln $< $@
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| 179 | endif
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| 180 | endif
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| 181 |
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| 182 | # The profiling startfile is made by linking together the normal
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| 183 | # startfile with gmon-start.o, which defines a constructor function
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| 184 | # to turn on profiling code at startup.
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| 185 | $(addprefix $(objpfx),$(sort g$(start-installed-name) \
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| 186 | g$(static-start-installed-name))): \
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| 187 | $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
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| 188 | $(link-relocatable)
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| 189 |
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| 190 | # These extra files are sometimes expected by system standard linking
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| 191 | # procedures, but we have nothing for them to do. So compile empty files.
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| 192 | $(addprefix $(objpfx),$(filter-out $(start-installed-name), $(csu-dummies))):\
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| 193 | $(before-compile)
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| 194 | $(COMPILE.c) -o $@ -x c /dev/null
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| 195 |
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| 196 | # These headers are used by the startup code.
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| 197 | $(objpfx)abi-tag.h: $(..)abi-tags
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| 198 | $(make-target-directory)
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| 199 | rm -f $@.new
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| 200 | sed -e 's/#.*$$//' -e '/^[ ]*$$/d' $< | \
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| 201 | while read conf tagos tagver; do \
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| 202 | test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
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| 203 | : "$$conf"` != 0 || continue; \
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| 204 | ( echo "$$tagos" | \
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| 205 | sed -e 's/[^0-9xXa-fA-F ]//' \
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| 206 | -e 's/^/#define __ABI_TAG_OS /'; \
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| 207 | echo "#ifndef __ABI_TAG_VERSION"; \
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| 208 | echo "$$tagver" | \
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| 209 | sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
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| 210 | -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
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| 211 | echo "#endif" ) > $@.new; \
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| 212 | done
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| 213 | if test -r $@.new; then mv -f $@.new $@; \
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| 214 | else echo >&2 'This configuration not matched in $<'; exit 1; fi
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| 215 |
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| 216 | all-Banner-files = $(wildcard $(addsuffix /Banner, \
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| 217 | $(addprefix $(..), $(subdirs))))
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| 218 | $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
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| 219 | $(make-target-directory)
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| 220 | (case $(config-os) in \
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| 221 | linux*) version=`(printf '%s\n%s\n' \
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| 222 | '#include <linux/version.h>' \
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| 223 | UTS_RELEASE \
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| 224 | | $(CC) $(CPPFLAGS) -E -P - -DNOT_IN_libc=1 | \
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| 225 | sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
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| 226 | if [ -z "$$version" ]; then \
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| 227 | if [ -r /proc/version ]; then \
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| 228 | version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
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| 229 | < /proc/version`; \
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| 230 | else \
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| 231 | version=`uname -r`; \
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| 232 | fi; \
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| 233 | fi; \
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| 234 | os=`uname -s 2> /dev/null`; \
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| 235 | if [ -z "$$os" ]; then \
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| 236 | os=Linux; \
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| 237 | fi; \
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| 238 | printf '"Compiled on a %s %s system on %s.\\n"\n' \
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| 239 | "$$os" "$$version" "`date +%Y-%m-%d`";; \
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| 240 | *) ;; \
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| 241 | esac; \
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| 242 | files="$(all-Banner-files)"; \
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| 243 | if test -n "$$files"; then \
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| 244 | printf '"Available extensions:\\n"\n'; \
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| 245 | sed -e '/^#/d' -e 's/^[[:space:]]*/ /' \
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| 246 | -e 's/^\(.*\)$$/\"\1\\n\"/' $$files; \
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| 247 | fi) > $@T
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| 248 | mv -f $@T $@
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