# Makefile for csu code for GNU C library.
-
-# Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+# Copyright (C) 1995-2014 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 Library General Public License
-# as published by the Free Software Foundation; either version 2 of
-# the License, or (at your option) any later version.
+# 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
-# Library General Public License for more details.
+# Lesser General Public License for more details.
-# You should have received a copy of the GNU Library General Public
-# License along with the GNU C Library; see the file COPYING.LIB. If
-# not, write to the Free Software Foundation, Inc., 675 Mass Ave,
-# Cambridge, MA 02139, USA.
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
# 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 in 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.
+# (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.
subdir := csu
+include ../Makeconfig
+
+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)
+ $(start-installed-name) g$(start-installed-name) $(csu-dummies) \
+ S$(start-installed-name)
omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
- $(csu-dummies))
-install-lib = $(start-installed-name) g$(start-installed-name) \
- $(csu-dummies)
-distribute = initfini.c gmon-start.c start.c
-
-all: # Make this the default target; it will be defined in Rules.
-
-include ../Makeconfig
-
-ifneq ($(elf),yes)
-
-# When not using ELF, there is just one startfile, called crt0.o.
-start-installed-name = crt0.o
-
-else
-
-# In the ELF universe, crt0.o is called crt1.o, and there are
-# some additional bizarre files.
-start-installed-name = crt1.o
-have-initfini = yes
-
+ b$(start-installed-name) $(csu-dummies) \
+ S$(start-installed-name))
+install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
+generated = version-info.h
+before-compile = $(objpfx)version-info.h
+
+tests := tst-empty tst-atomic tst-atomic-long
+tests-static := tst-empty
+
+ifeq (yes,$(build-shared))
+extra-objs += S$(start-installed-name)
+install-lib += S$(start-installed-name)
+generated += start.os
endif
-ifeq (yes,$(have-initfini))
+ifneq ($(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
-CPPFLAGS += -DHAVE_INITFINI
+before-compile += $(objpfx)abi-tag.h
+generated += abi-tag.h
# 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
install-lib += $(crtstuff:=.o)
extra-objs += $(crtstuff:=.o)
-generated += $(crtstuff:=.s)
-omit-deps += $(crtstuff)
-
-# Compile initfini.c to assembly code, which contains embedded shell
-# commands that prodice crti.s-new and crtn.s-new when run. We need to
-# disable emission of .size directives and debugging information, since
-# they will get confused by the splitting of the output we do.
-$(objpfx)cr%i.s $(objpfx)cr%n.s: initfini.c; $(initfini)
-
-define initfini
--rm -f $(objpfx)crtcommon.tmp
-(echo 'cat > crtcommon.tmp <<\EOF_common'; \
- $(CC) $< $(CPPFLAGS) $(CFLAGS) \
- -fPIC -finhibit-size-directive -g0 -S -o -; \
- echo 'EOF_common') | (cd $(@D); $(SHELL))
-cat $(objpfx)crtcommon.tmp >> $(objpfx)crti.s-new
-cat $(objpfx)crtcommon.tmp >> $(objpfx)crtn.s-new
-rm -f $(objpfx)crtcommon.tmp
-mv -f $(objpfx)crti.s-new $(subst crtn,crti,$@)
-mv -f $(objpfx)crtn.s-new $(subst crti,crtn,$@)
-endef
-endif
+extra-objs += abi-note.o init.o
+asm-CPPFLAGS += -I$(objpfx).
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 $@ $^
+endef
+
ifndef start-installed-name-rule
-# The startfile is installed under different names, so we just call our
-# source file `start.c' and copy to the installed name after compiling.
-$(objpfx)$(start-installed-name): $(objpfx)start.o
- -rm -f $@
- ln $< $@
+# We link the ELF startfile along with a SHT_NOTE section indicating
+# the kernel ABI the binaries linked with this library will require.
+$(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
+ $(objpfx)init.o
+ $(link-relocatable)
+$(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \
+ $(objpfx)init.o
+ $(link-relocatable)
endif
# The profiling startfile is made by linking together the normal
# startfile with gmon-start.o, which defines a constructor function
# to turn on profiling code at startup.
-$(objpfx)g$(start-installed-name): $(objpfx)start.o $(objpfx)gmon-start.o
- $(CC) -nostdlib -nostartfiles -r -o $@ $^
+$(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))):
- cp /dev/null $(@:.o=.c)
- $(COMPILE.c) $(@:.o=.c) $(OUTPUT_OPTION)
- rm -f $(@:.o=.c)
-
+$(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,\
+ $(sort $(subdir-srcdirs) \
+ $(sysdeps-srcdirs))))
+$(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
+ $(make-target-directory)
+ (case $(config-os) in \
+ linux*) version=`(printf '%s\n%s\n' \
+ '#include <linux/version.h>' \
+ UTS_RELEASE \
+ | $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 | \
+ sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
+ if [ -z "$$version" ]; then \
+ version=`(printf '%s\n%s\n' \
+ '#include <linux/version.h>' \
+ LINUX_VERSION_CODE \
+ | $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 \
+ | sed -n -e '/^[123456789].*/p' \
+ | awk '{v=$$1; \
+ printf("%d.%d.%d\n", \
+ v/65535, v/256%256, v%256)}') \
+ 2>/dev/null`; \
+ fi; \
+ 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 "$$os" ]; then \
+ os=Linux; \
+ fi; \
+ printf '"Compiled on a %s %s system on %s.\\n"\n' \
+ "$$os" "$$version" "`date +%Y-%m-%d`";; \
+ *) ;; \
+ esac; \
+ files="$(all-Banner-files)"; \
+ if test -n "$$files"; then \
+ printf '"Available extensions:\\n"\n'; \
+ sed -e '/^#/d' -e 's/^[[:space:]]*/ /' \
+ -e 's/^\(.*\)$$/\"\1\\n\"/' $$files; \
+ fi) > $@T
+ mv -f $@T $@