csu/Makefile

   1 # Makefile for csu code for GNU C library.
   2 # Copyright (C) 1995-2017 Free Software Foundation, Inc.
   3 # This file is part of the GNU C Library.
   4
   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.
   9
  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.
  14
  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/>.
  18
  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.
  24
  25 subdir := csu
  26
  27 include ../Makeconfig
  28
  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 install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
  42 generated += version-info.h
  43 before-compile += $(objpfx)version-info.h
  44
  45 # No tests are allowed in the csu/ subdirectory because the startup
  46 # code is compiled with special flags.
  47 tests =
  48
  49 CFLAGS-.o += $(no-stack-protector)
  50 CFLAGS-.op += $(no-stack-protector)
  51 CFLAGS-.os += $(no-stack-protector)
  52
  53 ifeq (yes,$(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
  63
  64 ifneq ($(start-installed-name),$(static-start-installed-name))
  65 extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
  66 omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
  67                              g$(static-start-installed-name))
  68 install-lib += $(static-start-installed-name) g$(static-start-installed-name)
  69 endif
  70
  71 before-compile += $(objpfx)abi-tag.h
  72 generated += abi-tag.h
  73
  74 # These are the special initializer/finalizer files.  They are always the
  75 # first and last file in the link.  crti.o ... crtn.o define the global
  76 # "functions" _init and _fini to run the .init and .fini sections.
  77 crtstuff = crti crtn
  78
  79 install-lib += $(crtstuff:=.o)
  80 extra-objs += $(crtstuff:=.o)
  81
  82 extra-objs += abi-note.o init.o
  83 asm-CPPFLAGS += -I$(objpfx).
  84
  85 include ../Rules
  86
  87 # Make these in the lib pass so they're available in time to link things with.
  88 subdir_lib: $(extra-objs:%=$(objpfx)%)
  89
  90 define link-relocatable
  91 $(CC) -nostdlib -nostartfiles -r -o $@ $^
  92 endef
  93
  94 ifndef start-installed-name-rule
  95 # We link the ELF startfile along with a SHT_NOTE section indicating
  96 # the kernel ABI the binaries linked with this library will require.
  97 $(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
  98                                   $(objpfx)init.o
  99         $(link-relocatable)
 100 $(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \
 101                                   $(objpfx)init.o
 102         $(link-relocatable)
 103 endif
 104
 105 # The profiling startfile is made by linking together the normal
 106 # startfile with gmon-start.o, which defines a constructor function
 107 # to turn on profiling code at startup.
 108 ifeq (yes,$(build-shared))
 109 $(objpfx)g$(start-installed-name): \
 110   $(objpfx)g%: $(objpfx)S% $(objpfx)gmon-start.os
 111         $(link-relocatable)
 112 ifneq ($(start-installed-name),$(static-start-installed-name))
 113 $(objpfx)g$(static-start-installed-name): \
 114   $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
 115         $(link-relocatable)
 116 endif
 117 else
 118 $(addprefix $(objpfx),$(sort g$(start-installed-name) \
 119                              g$(static-start-installed-name))): \
 120   $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
 121         $(link-relocatable)
 122 endif
 123
 124 # These extra files are sometimes expected by system standard linking
 125 # procedures, but we have nothing for them to do.  So compile empty files.
 126 $(addprefix $(objpfx),$(filter-out $(start-installed-name), $(csu-dummies))):\
 127   $(before-compile)
 128         $(COMPILE.c) -o $@ -x c /dev/null
 129
 130 # These headers are used by the startup code.
 131 $(objpfx)abi-tag.h: $(..)abi-tags
 132         $(make-target-directory)
 133         rm -f $@.new
 134         sed -e 's/#.*$$//' -e '/^[      ]*$$/d' $< | \
 135         while read conf tagos tagver; do \
 136           test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
 137                      : "$$conf"` != 0 || continue; \
 138           ( echo "$$tagos" | \
 139             sed -e 's/[^0-9xXa-fA-F     ]//' \
 140                 -e 's/^/#define __ABI_TAG_OS /'; \
 141             echo "#ifndef __ABI_TAG_VERSION"; \
 142             echo "$$tagver" | \
 143             sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
 144               -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
 145             echo "#endif" ) > $@.new; \
 146         done
 147         if test -r $@.new; then mv -f $@.new $@; \
 148         else echo >&2 'This configuration not matched in $<'; exit 1; fi
 149
 150 all-Banner-files = $(wildcard $(addsuffix /Banner,\
 151                                           $(sort $(subdir-srcdirs) \
 152                                                  $(sysdeps-srcdirs))))
 153 $(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
 154         $(make-target-directory)
 155         (files="$(all-Banner-files)";                           \
 156          if test -n "$$files"; then                             \
 157            printf '"Available extensions:\\n"\n';               \
 158            sed -e '/^#/d' -e 's/^[[:space:]]*/  /'              \
 159                -e 's/^\(.*\)$$/\"\1\\n\"/' $$files;             \
 160          fi) > $@T
 161         mv -f $@T $@