# Makefile for csu code for GNU C library. # Copyright (C) 1995-2016 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, see # . # 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. 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 \ $(start-installed-name) g$(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) 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$(start-installed-name) gmon-start.os ifneq ($(start-installed-name),$(static-start-installed-name)) extra-objs += gmon-start.o endif install-lib += S$(start-installed-name) generated += start.os else extra-objs += gmon-start.o 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 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 # "functions" _init and _fini to run the .init and .fini sections. crtstuff = crti crtn install-lib += $(crtstuff:=.o) extra-objs += $(crtstuff:=.o) extra-objs += abi-note.o init.o asm-CPPFLAGS += -I$(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 # 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 $(link-relocatable) endif # The profiling startfile is made by linking together the normal # startfile with gmon-start.o, which defines a constructor function # to turn on profiling code at startup. ifeq (yes,$(build-shared)) $(objpfx)g$(start-installed-name): \ $(objpfx)g%: $(objpfx)S% $(objpfx)gmon-start.os $(link-relocatable) ifneq ($(start-installed-name),$(static-start-installed-name)) $(objpfx)g$(static-start-installed-name): \ $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o $(link-relocatable) endif else $(addprefix $(objpfx),$(sort g$(start-installed-name) \ g$(static-start-installed-name))): \ $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o $(link-relocatable) endif # 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) $(make-target-directory) (files="$(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 $@