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https://sourceware.org/git/glibc.git
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233 lines
8.3 KiB
Makefile
233 lines
8.3 KiB
Makefile
# Makefile for csu code for GNU C library.
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# Copyright (C) 1995-2006, 2010, 2012 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, write to the Free
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# Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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# 02111-1307 USA.
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# This directory contains the C startup code (that which calls main). This
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# consists of the startfile, built from start.c and installed as crt0.o
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# (traditionally) or crt1.o (for ELF). In ELF we also install crti.o and
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# crtn.o, special "initializer" and "finalizer" files used in the link
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# to make the .init and .fini sections work right; both these files are
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# built (in an arcane manner) from initfini.c.
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subdir := csu
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routines = init-first libc-start $(libc-init) sysdep version check_fds \
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libc-tls elf-init dso_handle
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aux = errno
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elide-routines.os = libc-tls
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static-only-routines = elf-init
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csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.o)
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extra-objs = start.o gmon-start.o \
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$(start-installed-name) g$(start-installed-name) $(csu-dummies) \
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S$(start-installed-name)
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omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
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b$(start-installed-name) $(csu-dummies) \
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S$(start-installed-name))
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install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
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distribute = initfini.c gmon-start.c start.c defs.awk \
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abi-note.S init.c c not-cancel.h
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generated = version-info.h
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before-compile = $(objpfx)version-info.h
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tests := tst-empty tst-atomic tst-atomic-long
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tests-static := tst-empty
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all: # Make this the default target; it will be defined in Rules.
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include ../Makeconfig
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ifeq (yes,$(build-shared))
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extra-objs += S$(start-installed-name)
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install-lib += S$(start-installed-name)
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generated += start.os
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endif
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ifeq (yes,$(build-bounded))
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extra-objs += b$(start-installed-name)
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install-lib += b$(start-installed-name)
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generated += start.ob
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endif
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ifneq ($(start-installed-name),$(static-start-installed-name))
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extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
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omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
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g$(static-start-installed-name))
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install-lib += $(static-start-installed-name) g$(static-start-installed-name)
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endif
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before-compile += $(objpfx)abi-tag.h
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generated += abi-tag.h
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# These are the special initializer/finalizer files. They are always the
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# first and last file in the link. crti.o ... crtn.o define the global
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# "functions" _init and _fini to run the .init and .fini sections.
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crtstuff = crti crtn
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install-lib += $(crtstuff:=.o)
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extra-objs += $(crtstuff:=.o)
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# Conditionals on the existence of a sysdeps version of crti.S are
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# temporary until all targets either have such a file or have been
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# removed, after which the old approach of postprocessing compiler
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# output will be removed.
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ifeq (,$(wildcard $(sysdirs:%=%/crti.S)))
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generated += $(crtstuff:=.S) initfini.s defs.h
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omit-deps += $(crtstuff)
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# Special rules for the building of crti.o and crtn.o
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$(crtstuff:%=$(objpfx)%.o): %.o: %.S $(objpfx)defs.h
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$(compile.S) -g0 $(ASFLAGS-.os) -o $@
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CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions $(fno-unit-at-a-time)
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vpath initfini.c $(sysdirs)
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$(objpfx)initfini.s: initfini.c $(before-compile)
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$(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
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$(patsubst -f%,-fno-%,$(exceptions)) -o $@
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# We only have one kind of startup code files. Static binaries and
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# shared libraries are build using the PIC version.
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$(objpfx)crti.S: $(objpfx)initfini.s
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sed -n -e '1,/@HEADER_ENDS/p' \
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-e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
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-e '/@TRAILER_BEGINS/,$$p' $< > $@
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$(objpfx)crtn.S: $(objpfx)initfini.s
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sed -n -e '1,/@HEADER_ENDS/p' \
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-e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
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-e '/@TRAILER_BEGINS/,$$p' $< > $@
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# These explicit rules are necessary when the $(objpfx) subdirectory
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# did not exist at the time make considered the implicit rules using it.
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# This comes up with a fresh build using no_deps=t.
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$(patsubst %,$(objpfx)crt%.o,i n): %.o: %.S
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$(objpfx)defs.h: $(objpfx)initfini.s
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sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
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$(AWK) -f defs.awk > $@
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endif
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extra-objs += abi-note.o init.o
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asm-CPPFLAGS += -I$(objpfx).
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include ../Rules
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# Make these in the lib pass so they're available in time to link things with.
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subdir_lib: $(extra-objs:%=$(objpfx)%)
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define link-relocatable
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$(CC) -nostdlib -nostartfiles -r -o $@ $^
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endef
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ifndef start-installed-name-rule
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# We link the ELF startfile along with a SHT_NOTE section indicating
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# the kernel ABI the binaries linked with this library will require.
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$(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
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$(objpfx)init.o
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$(link-relocatable)
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$(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \
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$(objpfx)init.o
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$(link-relocatable)
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$(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \
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$(objpfx)init.ob
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$(link-relocatable)
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endif
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# The profiling startfile is made by linking together the normal
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# startfile with gmon-start.o, which defines a constructor function
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# to turn on profiling code at startup.
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$(addprefix $(objpfx),$(sort g$(start-installed-name) \
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g$(static-start-installed-name))): \
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$(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
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$(link-relocatable)
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# These extra files are sometimes expected by system standard linking
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# procedures, but we have nothing for them to do. So compile empty files.
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$(addprefix $(objpfx),$(filter-out $(start-installed-name), $(csu-dummies))):\
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$(before-compile)
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$(COMPILE.c) -o $@ -x c /dev/null
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# These headers are used by the startup code.
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$(objpfx)abi-tag.h: $(..)abi-tags
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$(make-target-directory)
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rm -f $@.new
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sed -e 's/#.*$$//' -e '/^[ ]*$$/d' $< | \
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while read conf tagos tagver; do \
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test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
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: "$$conf"` != 0 || continue; \
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( echo "$$tagos" | \
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sed -e 's/[^0-9xXa-fA-F ]//' \
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-e 's/^/#define __ABI_TAG_OS /'; \
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echo "#ifndef __ABI_TAG_VERSION"; \
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echo "$$tagver" | \
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sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
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-e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
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echo "#endif" ) > $@.new; \
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done
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if test -r $@.new; then mv -f $@.new $@; \
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else echo >&2 'This configuration not matched in $<'; exit 1; fi
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all-Banner-files = $(wildcard $(addsuffix /Banner,\
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$(sort $(subdir-srcdirs) \
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$(sysdeps-srcdirs))))
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$(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
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$(make-target-directory)
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(case $(config-os) in \
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linux*) version=`(printf '%s\n%s\n' \
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'#include <linux/version.h>' \
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UTS_RELEASE \
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| $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 | \
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sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
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if [ -z "$$version" ]; then \
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version=`(printf '%s\n%s\n' \
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'#include <linux/version.h>' \
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LINUX_VERSION_CODE \
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| $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 \
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| sed -n -e '/^[123456789].*/p' \
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| awk '{v=$$1; \
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printf("%d.%d.%d\n", \
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v/65535, v/256%256, v%256)}') \
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2>/dev/null`; \
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fi; \
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if [ -z "$$version" ]; then \
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if [ -r /proc/version ]; then \
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version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
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< /proc/version`; \
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else \
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version=`uname -r`; \
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fi; \
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fi; \
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os=`uname -s 2> /dev/null`; \
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if [ -z "$$os" ]; then \
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os=Linux; \
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fi; \
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printf '"Compiled on a %s %s system on %s.\\n"\n' \
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"$$os" "$$version" "`date +%Y-%m-%d`";; \
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*) ;; \
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esac; \
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files="$(all-Banner-files)"; \
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if test -n "$$files"; then \
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printf '"Available extensions:\\n"\n'; \
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sed -e '/^#/d' -e 's/^[[:space:]]*/ /' \
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-e 's/^\(.*\)$$/\"\1\\n\"/' $$files; \
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fi) > $@T
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mv -f $@T $@
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