| # Makefile for csu code for GNU C library. |
| # Copyright (C) 1995-2004, 2005, 2006 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 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 |
| # Lesser General Public License for more details. |
| |
| # You should have received a copy of the GNU Lesser General Public |
| # License along with the GNU C Library; if not, write to the Free |
| # Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| # 02111-1307 USA. |
| |
| # 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 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. |
| |
| subdir := csu |
| |
| 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) $(csu-dummies) \ |
| S$(start-installed-name) |
| omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \ |
| b$(start-installed-name) $(csu-dummies) \ |
| S$(start-installed-name)) |
| install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies) |
| distribute = initfini.c gmon-start.c start.c defs.awk \ |
| abi-note.S init.c c not-cancel.h |
| generated = version-info.h |
| before-compile = $(objpfx)version-info.h |
| |
| tests := tst-empty tst-atomic tst-atomic-long |
| tests-static := tst-empty |
| |
| all: # Make this the default target; it will be defined in Rules. |
| |
| include ../Makeconfig |
| |
| ifeq (yes,$(build-shared)) |
| extra-objs += S$(start-installed-name) |
| install-lib += S$(start-installed-name) |
| generated += start.os |
| endif |
| |
| ifeq (yes,$(build-bounded)) |
| extra-objs += b$(start-installed-name) |
| install-lib += b$(start-installed-name) |
| generated += start.ob |
| endif |
| |
| ifneq ($(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 |
| |
| ifeq (yes,$(elf)) |
| before-compile += $(objpfx)abi-tag.h |
| generated += abi-tag.h |
| endif |
| |
| ifeq ($(have-initfini),yes) |
| |
| CPPFLAGS += -DHAVE_INITFINI |
| |
| # 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 |
| # "functions" _init and _fini to run the .init and .fini sections. |
| crtstuff = crti crtn |
| |
| install-lib += $(crtstuff:=.o) |
| extra-objs += $(crtstuff:=.o) |
| generated += $(crtstuff:=.S) initfini.s defs.h |
| omit-deps += $(crtstuff) |
| |
| # Special rules for the building of crti.o and crtn.o |
| $(crtstuff:%=$(objpfx)%.o): %.o: %.S $(objpfx)defs.h |
| $(compile.S) -g0 $(ASFLAGS-.os) -o $@ |
| |
| CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions $(fno-unit-at-a-time) |
| |
| vpath initfini.c $(sysdirs) |
| |
| $(objpfx)initfini.s: initfini.c $(before-compile) |
| $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \ |
| $(patsubst -f%,-fno-%,$(exceptions)) -o $@ |
| |
| # We only have one kind of startup code files. Static binaries and |
| # shared libraries are build using the PIC version. |
| $(objpfx)crti.S: $(objpfx)initfini.s |
| sed -n -e '1,/@HEADER_ENDS/p' \ |
| -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \ |
| -e '/@TRAILER_BEGINS/,$$p' $< > $@ |
| |
| $(objpfx)crtn.S: $(objpfx)initfini.s |
| sed -n -e '1,/@HEADER_ENDS/p' \ |
| -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \ |
| -e '/@TRAILER_BEGINS/,$$p' $< > $@ |
| |
| # These explicit rules are necessary when the $(objpfx) subdirectory |
| # did not exist at the time make considered the implicit rules using it. |
| # This comes up with a fresh build using no_deps=t. |
| $(patsubst %,$(objpfx)crt%.o,i n): %.o: %.S |
| |
| $(objpfx)defs.h: $(objpfx)initfini.s |
| sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \ |
| $(AWK) -f defs.awk > $@ |
| |
| endif |
| |
| ifeq (yes,$(elf)) |
| extra-objs += abi-note.o init.o |
| asm-CPPFLAGS += -I$(objpfx). |
| endif |
| |
| 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 $@ $^ |
| endef |
| |
| ifndef start-installed-name-rule |
| ifeq (yes,$(elf)) |
| # 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) |
| $(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \ |
| $(objpfx)init.ob |
| $(link-relocatable) |
| else |
| # 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 $< $@ |
| $(objpfx)S$(start-installed-name): $(objpfx)start.os |
| rm -f $@ |
| ln $< $@ |
| $(objpfx)b$(start-installed-name): $(objpfx)start.ob |
| rm -f $@ |
| ln $< $@ |
| endif |
| 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. |
| $(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))):\ |
| $(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) -E -P - -DNOT_IN_libc=1 | \ |
| sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\ |
| 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 $@ |