196 lines
6.7 KiB
Makefile
196 lines
6.7 KiB
Makefile
# Makefile for csu code for GNU C library.
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# Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000 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 Library General Public License
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# as published by the Free Software Foundation; either version 2 of
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# 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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# Library General Public License for more details.
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# You should have received a copy of the GNU Library General Public
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# License along with the GNU C Library; see the file COPYING.LIB. If not,
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# write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 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
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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$(start-installed-name) \
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$(csu-dummies)
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omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
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$(csu-dummies))
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install-lib = $(start-installed-name) g$(start-installed-name) \
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$(csu-dummies)
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distribute = initfini.c gmon-start.c start.c defs.awk munch.awk \
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abi-note.S init.c munch-tmpl.c
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generated = version-info.h
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before-compile = $(objpfx)version-info.h
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all: # Make this the default target; it will be defined in Rules.
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include ../Makeconfig
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ifeq (yes,$(elf))
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before-compile += $(objpfx)abi-tag.h
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generated += abi-tag.h
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endif
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ifeq (yes,$(gnu-ld))
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libc-init = set-init
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else
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libc-init = munch-init
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$(objpfx)munch-init.c: munch.awk munch-tmpl.c $(+subdir_inits)
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$(AWK) -f $< subdirs='$(+init_subdirs)' $(word 2,$^) > $@-t
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mv -f $@-t $@
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generated += munch-init.c
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# All initialization source files.
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+subdir_inits := $(wildcard $(foreach dir,$(subdirs),$(dir)/init-$(dir).c))
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# All subdirectories containing initialization source files.
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+init_subdirs := $(patsubst %/,%,$(dir $(+subdir_inits)))
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endif
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ifeq ($(have-initfini),yes)
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CPPFLAGS += -DHAVE_INITFINI
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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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generated += $(crtstuff:=.S) initfini.s defs.h
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omit-deps += $(crtstuff)
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# Special rules for the building of crti.o and crtn.o
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$(objpfx)crt%.o: $(objpfx)crt%.S $(objpfx)defs.h
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$(compile.S) -g0 $(ASFLAGS-.os) -o $@
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CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions
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$(objpfx)initfini.s: initfini.c
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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' $< > $@
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$(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 > $@
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endif
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ifeq (yes,$(elf))
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extra-objs += abi-note.o init.o
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asm-CPPFLAGS += -I$(objpfx).
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endif
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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 $@ $^
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endef
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ifndef start-installed-name-rule
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ifeq (yes,$(elf))
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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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$(link-relocatable)
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else
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# The startfile is installed under different names, so we just call our
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# source file `start.c' and copy to the installed name after compiling.
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$(objpfx)$(start-installed-name): $(objpfx)start.o
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rm -f $@
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ln $< $@
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endif
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endif
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# The profiling startfile is made by linking together the normal
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# startfile with gmon-start.o, which defines a constructor function
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# to turn on profiling code at startup.
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$(objpfx)g$(start-installed-name): $(objpfx)$(start-installed-name) \
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$(objpfx)gmon-start.o
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$(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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cp /dev/null $(@:.o=.c)
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$(COMPILE.c) $(@:.o=.c) $(OUTPUT_OPTION)
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rm -f $(@:.o=.c)
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# These headers are used by the startup code.
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$(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' $< | \
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while read conf tag; do \
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test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
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: "$$conf"` != 0 || continue; \
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echo "$$tag" | \
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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 /' > $@.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 $(addsuffix /Banner, \
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$(addprefix $(..), $(subdirs))))
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$(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=`(echo -e "#include <linux/version.h>\nUTS_RELEASE"\
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| $(CC) -E -P - | \
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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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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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echo "\"Compiled on a Linux $$version system" \
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"on `date +%Y-%m-%d`.\\n\"" ;; \
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*) ;; \
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esac; \
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files="$(all-Banner-files)"; \
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if test -n "$$files"; then \
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echo "\"Available extensions:"; \
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sed -e '/^#/d' -e 's/^[[:space:]]*/ /' $$files; \
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echo "\""; \
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fi) > $@T
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mv -f $@T $@
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