configure

gcc库的原代码,对编程有很大帮助.

		cpu_type=sh
		;;
	sparc-tti-*)
		tm_file=sparc/pbd.h
		xm_file=sparc/xm-pbd.h
		;;
	sparc-wrs-vxworks* | sparclite-wrs-vxworks*)
		cpu_type=sparc
		tm_file=sparc/vxsparc.h
		tmake_file=sparc/t-vxsparc
		use_collect2=yes
		;;
	sparc-*-aout*)
		tmake_file=sparc/t-sparcbare
		tm_file=sparc/sparc-aout.h
		;;
	sparc-*-netbsd*)
		tm_file=sparc/netbsd.h
		xm_file=sparc/xm-netbsd.h
		# On NetBSD, the headers are already okay.
		fixincludes=Makefile.in
		tmake_file=t-libc-ok
		xmake_file=x-netbsd
		;;
	sparc-*-bsd*)
		tm_file=sparc/bsd.h
		;;
	sparc-*-lynxos*)
		if [ x$gas = xyes ]
		then
			tm_file=sparc/lynx.h
		else
			tm_file=sparc/lynx-ng.h
		fi
		xm_file=sparc/xm-lynx.h
		tmake_file=sparc/t-sunos41
		xmake_file=x-lynx
		;;
	sparc-*-solaris2* | sparc-*-sunos5*)
		xm_file=sparc/xm-sol2.h
		tm_file=sparc/sol2.h
		tmake_file=sparc/t-sol2
		xmake_file=sparc/x-sysv4
		extra_parts="crt1.o crti.o crtn.o gmon.o crtbegin.o crtend.o"
		fixincludes=fixinc.svr4
		broken_install=yes
		;;
	sparc-*-sunos4.0*)
		tm_file=sparc/sunos4.h
		tmake_file=sparc/t-sunos40
		use_collect2=yes
		;;
	sparc-*-sunos4*)
		tm_file=sparc/sunos4.h
		tmake_file=sparc/t-sunos41
		use_collect2=yes
		;;
	sparc-*-sunos3*)
		tm_file=sparc/sun4o3.h
		use_collect2=yes
		;;
	sparc-*-sysv4*)
		xm_file=sparc/xm-sysv4.h
		tm_file=sparc/sysv4.h
		tmake_file=t-svr4
		xmake_file=sparc/x-sysv4
		extra_parts="crtbegin.o crtend.o"
		;;
	sparclite-*-coff*)
		cpu_type=sparc
		tm_file=sparc/litecoff.h
		tmake_file=sparc/t-sparclite
		;;
	sparclite-*-*)
		cpu_type=sparc
		tm_file=sparc/lite.h
		tmake_file=sparc/t-sparclite
		use_collect2=yes
		;;
	sparc64-*-aout*)
		cpu_type=sparc
		tmake_file=sparc/t-sp64
		tm_file=sparc/sp64-aout.h
		;;
	sparc64-*-elf*)
		cpu_type=sparc
		tmake_file=sparc/t-sp64
		tm_file=sparc/sp64-elf.h
		extra_parts="crtbegin.o crtend.o"
		;;
# This hasn't been upgraded to GCC 2.
#	tahoe-harris-*)			# Harris tahoe, using COFF.
#		tm_file=tahoe/harris.h
#		;;
#	tahoe-*-bsd*)			# tahoe running BSD
#		;;
# This hasn't been upgraded to GCC 2.
#	tron-*-*)
#		cpu_type=gmicro
#		use_collect2=yes
#		;;
	vax-*-bsd*)			# vaxen running BSD
		use_collect2=yes
		;;
	vax-*-sysv*)			# vaxen running system V
		xm_file=vax/xm-vaxv.h
		tm_file=vax/vaxv.h
		;;
	vax-*-netbsd*)
		tm_file=vax/netbsd.h
		xm_file=vax/xm-netbsd.h
		tmake_file=t-libc-ok
		# On NetBSD, the headers are already okay.
		fixincludes=Makefile.in
		xmake_file=x-netbsd
		;;
	vax-*-ultrix*)			# vaxen running ultrix
		tm_file=vax/ultrix.h
		use_collect2=yes
		;;
	vax-*-vms*)			# vaxen running VMS
		xm_file=vax/xm-vms.h
		tm_file=vax/vms.h
		;;
        pdp11-*-bsd)
		xm_file=pdp11/xm-pdp11.h
		tm_file=pdp11/2bsd.h
		tmake_file=pdp11/t-pdp11
                ;;
        pdp11-*-*)
		xm_file=pdp11/xm-pdp11.h
		tm_file=pdp11/pdp11.h
		tmake_file=pdp11/t-pdp11
		;;
	we32k-att-sysv*)
		cpu_type=we32k
		use_collect2=yes
		;;
	*)
		echo "Configuration $machine not supported" 1>&2
		exit 1
		;;
	esac

	case $machine in
	*-*-gnu*)
		# On the GNU system, the setup is just about the same on
		# each different CPU.  The specific machines that GNU
		# supports are matched above and just set $cpu_type.
		xm_file=${cpu_type}/xm-gnu.h
		tm_file=${cpu_type}/gnu.h
		extra_parts="crtbegin.o crtbeginS.o crtend.o crtendS.o"
		# GNU always uses ELF.
		elf=yes
		# GNU tools are the only tools.
		gnu_ld=yes
		gas=yes
		# On GNU, the headers are already okay.
		fixincludes=Makefile.in
		# Don't build libgcc1.c, because there is no non-GNU
		# compiler to build it with.  The GNU system C library will
		# include assembly versions of any needed functions.
		tmake_file=t-libc-ok
		;;
	*-*-sysv4*)
		fixincludes=fixinc.svr4
		xmake_try_sysv=x-sysv
		broken_install=yes
		install_headers_dir=install-headers-cpio
		;;
	*-*-sysv*)
		broken_install=yes
		install_headers_dir=install-headers-cpio
		;;
	esac

	# Distinguish i386 from i486/i586.
	# ??? For the moment we treat i586 as an i486.
	# Also, do not run mips-tfile on MIPS if using gas.
	case $machine in
	i[45]86-*-*)
		target_cpu_default=2
		;;
	mips*-*-*)
		if [ x$gas = xyes ]
		then
			target_cpu_default=16
		fi
		;;
	alpha-*-*)
		if [ x$gas = xyes ]
		then
			target_cpu_default=4
		fi
		;;
	esac

	# No need for collect2 if we have the GNU linker.
	case x$gnu_ld in 
	xyes)
		use_collect2=
		;;
	esac

# Default certain vars that apply to both host and target in turn.
	if [ x$cpu_type = x ]
	then cpu_type=`echo $machine | sed 's/-.*$//'`
	fi

# Save data on machine being used to compile GCC in build_xm_file.
# Save data on host machine in vars host_xm_file and host_xmake_file.
	if [ x$pass1done = x ]
	then
		if [ x$xm_file = x ]
		then build_xm_file=$cpu_type/xm-$cpu_type.h
		else build_xm_file=$xm_file
		fi
		pass1done=yes
	else
		if [ x$pass2done = x ]
		then
			if [ x$xm_file = x ]
			then host_xm_file=$cpu_type/xm-$cpu_type.h
			else host_xm_file=$xm_file
			fi
			if [ x$xmake_file = x ]
			then xmake_file=$cpu_type/x-$cpu_type
			fi
			host_xmake_file=$xmake_file
			host_broken_install=$broken_install
			host_install_headers_dir=$install_headers_dir
			host_truncate_target=$truncate_target
			pass2done=yes
		fi
	fi
done

# Default the target-machine variables that were not explicitly set.
if [ x$tm_file = x ]
then tm_file=$cpu_type/$cpu_type.h; fi

if [ x$extra_headers = x ]
then extra_headers=; fi

if [ x$xm_file = x ]
then xm_file=$cpu_type/xm-$cpu_type.h; fi

md_file=$cpu_type/$cpu_type.md

if [ x$out_file = x ]
then out_file=$cpu_type/$cpu_type.c; fi

if [ x$tmake_file = x ]
then tmake_file=$cpu_type/t-$cpu_type
fi

# Say what files are being used for the output code and MD file.
echo "Using \`$srcdir/config/$out_file' to output insns."
echo "Using \`$srcdir/config/$md_file' as machine description file."
echo "Using \`$srcdir/config/$tm_file' as target machine macro file."
echo "Using \`$srcdir/config/$host_xm_file' as host machine macro file."
if [ $host_xm_file != $build_xm_file ]; then
	echo "Using \`$srcdir/config/$build_xm_file' as build machine macro file."
fi

# Set up the list of links to be made.
# $links is the list of link names, and $files is the list of names to link to.
files="$host_xm_file $tm_file $xm_file $build_xm_file"
links="config.h tm.h tconfig.h hconfig.h"

rm -f config.bak
if [ -f config.status ]; then mv -f config.status config.bak; fi

# Make the links.
while [ -n "$files" ]
do
	# set file to car of files, files to cdr of files
	set $files; file=$1; shift; files=$*
	set $links; link=$1; shift; links=$*

	rm -f $link
	echo "#include \"$file\"" >$link
done

# Truncate the target if necessary
if [ x$host_truncate_target != x ]; then
	target=`echo $target | sed -e 's/\(..............\).*/\1/'`
fi

# Get the version number from the toplevel
version=`sed -e 's/.*\"\([^ \"]*\)[ \"].*/\1/' < ${srcdir}/version.c`

# For the current directory and all of the language subdirectories,
# do the rest of the script ...

subdirs=
for lang in ${srcdir}/*/config-lang.in ..
do
	case $lang in
	..) ;;
	# The odd quoting in the next line works around
	# an apparent bug in bash 1.12 on linux.
	${srcdir}/[*]/config-lang.in) ;;
	*) subdirs="$subdirs `echo $lang | sed -e 's,^.*/\([^/]*\)/config-lang.in$,\1,'`" ;;
	esac
done

# Are we using gcc as the native compiler?
case $canon_host in
*linux*)	# All Linux's use gcc as the native compiler.
	prefix=$native_prefix
	;;
esac

# Make empty files to contain the specs and options for each language.
# Then add #include lines to for a compiler that has specs and/or options.

lang_specs_files=
lang_options_files=
rm -f specs.h options.h
touch specs.h options.h
for subdir in . $subdirs
do
	if [ -f $srcdir/$subdir/lang-specs.h ]; then
		echo "#include \"$subdir/lang-specs.h\"" >>specs.h
		lang_specs_files="$lang_specs_files $srcdir/$subdir/lang-specs.h"
	fi
	if [ -f $srcdir/$subdir/lang-options.h ]; then
		echo "#include \"$subdir/lang-options.h\"" >>options.h
		lang_options_files="$lang_options_files $srcdir/$subdir/lang-options.h"
	fi
done

# Define SET_MAKE if this old version of `make' doesn't define $(MAKE).
rm -f Makefile.xx
(echo 'all:'; echo '	@echo maketemp=$(MAKE)') >Makefile.xx
case `${MAKE-make} -f Makefile.xx 2>/dev/null | grep maketemp=` in
'maketemp=')
	SET_MAKE="MAKE = ${MAKE-make}"
	;;
*)
	SET_MAKE=
	;;
esac
rm -f Makefile.xx

savesrcdir=$srcdir
for subdir in . $subdirs
do
	oldsrcdir=$savesrcdir

	# Re-adjust the path
	case $oldsrcdir in
	/*)
		srcdir=$oldsrcdir/$subdir
		;;
	*)
		case $subdir in
		.)
			;;
		*)
			oldsrcdir=../${oldsrcdir}
			srcdir=$oldsrcdir/$subdir
			;;
		esac
		;;
	esac
	mainsrcdir=$oldsrcdir
	STARTDIR=`pwd`
	test -d $subdir || mkdir $subdir
	cd $subdir

	# Create Makefile.tem from Makefile.in.
	# Make it set VPATH if necessary so that the sources are found.
	# Also change its value of srcdir.
	# Also create a .gdbinit file which runs the one in srcdir
	# and tells GDB to look there for source files.
	case $srcdir in
	. | ./$subdir | .././$subdir)
		rm -f Makefile.tem
		cp Makefile.in Makefile.tem
		chmod +w Makefile.tem
		;;
	*)
		rm -f Makefile.tem
		echo "VPATH = ${srcdir}" \
		  | cat - ${srcdir}/Makefile.in \
		  | sed "s@^srcdir = \.@srcdir = ${srcdir}@" > Makefile.tem
		rm -f .gdbinit
		echo "dir ." > .gdbinit
		echo "dir ${srcdir}" >> .gdbinit
		if [ x$gdb_needs_out_file_path = xyes ]
		then
			echo "dir ${srcdir}/config/"`dirname ${out_file}` >> .gdbinit
		fi
		if [ "x$subdirs" != x ]; then
			for s in $subdirs
			do
				echo "dir ${srcdir}/$s" >> .gdbinit
			done
		fi
		echo "source ${srcdir}/.gdbinit" >> .gdbinit
		;;
	esac
	
	# Conditionalize the makefile for this host machine.
	if [ -f ${mainsrcdir}/config/${host_xmake_file} ]
	then
		rm -f Makefile.xx
		sed -e "/####host/  r ${mainsrcdir}/config/${host_xmake_file}" Makefile.tem > Makefile.xx
		echo "Merged ${host_xmake_file}."
		rm -f Makefile.tem
		mv Makefile.xx Makefile.tem
		dep_host_xmake_file=${host_xmake_file}
	else
	# Say in the makefile that there is no host_xmake_file,
	# by using a name which (when interpreted relative to $srcdir/config)
	# will duplicate another dependency: $srcdir/Makefile.in.
		dep_host_xmake_file=../Makefile.in
	fi

	# Add a definition for MAKE if system wants one.
	case "$SET_MAKE" in
	?*)
		rm -f Makefile.xx
		(echo "$SET_MAKE"; cat Makefile.tem) >Makefile.xx
		rm -f Makefile.tem
		mv Makefile.xx Makefile.tem
	esac

	# Add a definition for INSTALL if system wants one.
	# This substitutes for lots of x-* files.
	if [ x$host_broken_install = x ]
	then true
	else
		rm -f Makefile.xx
		abssrcdir=`cd ${srcdir}; pwd`
		sed "s|^INSTALL = .*|INSTALL = ${abssrcdir}/install.sh -c|" Makefile.tem > Makefile.xx
		rm -f Makefile.tem
		mv Makefile.xx Makefile.tem
	fi

	# Some of the following don't make sense in the language makefiles,
	# but rather than introduce another level of nesting, we leave them
	# as is.

	# Set EXTRA_HEADERS according to extra_headers.
	# This substitutes for lots of t-* files.
	if [ "x$extra_headers" = x ]
	then true
	else
		# Prepend ${srcdir}/ginclude/ to every entry in extra_headers.
		list=
		for file in $extra_headers;
		do
			list="${list} ${srcdir}/ginclude/${file}"
		done
		rm -f Makefile.xx
		sed "s|^EXTRA_HEADERS =|EXTRA_HEADERS = ${list}|" Makefile.tem > Makefile.xx
		rm -f Makefile.tem
		mv Makefile.xx Makefile.tem
	fi
	
	# Set EXTRA_PASSES according to extra_passes.
	# This substitutes for lots of t-* files.
	if [ "x$extra_passes" = x ]
	then true
	else
		rm -f Makefile.xx
		sed "s/^EXTRA_PASSES =/EXTRA_PASSES = $extra_passes/" Makefile.tem > Makefile.xx
		rm -f Makefile.tem
		mv Makefile.xx Makefile.tem
	fi
	
	# Set EXTRA_PARTS according to extra_parts.
	# This substitutes for lots of t-* files.
	if [ "x$extra_parts" = x ]
	then true
	else
		rm -f Makefile.xx
		sed "s/^EXTRA_PARTS =/EXTRA_PARTS = $extra_parts/" Makefile.tem > Makefile.xx
		rm -f Makefile.tem
		mv Makefile.xx Makefile.tem
	fi

	# Set EXTRA_PROGRAMS according to extra_programs.
	if [ "x$extra_programs" = x ]
	then true
	else
		rm -f Makefile.xx
		sed "s/^EXTRA_PROGRAMS =/EXTRA_PROGRAMS = $extra_programs/" Makefile.tem > Makefile.xx
		rm -f Makefile.tem
		mv Makefile.xx Makefile.tem
	fi

	# Set EXTRA_OBJS according to extra_objs.
	# This substitutes for lots of t-* files.
	if [ "x$extra_objs" = x ]
	then true
	else
		rm -f Makefile.xx
		sed "s|^EXTRA_OBJS =|EXTRA_OBJS = $extra_objs|" Makefile.tem > Makefile.xx
		rm -f Makefile.tem
		mv Makefile.xx Makefile.tem
	fi

	# Set EXTRA_GCC_OBJS according to extra_gcc_objs.
	# This substitutes for lots of t-* files.
	if [ "x$extra_gcc_objs" = x ]
	then true
	else
		rm -f Makefile.xx
		sed "s|^EXTRA_GCC_OBJS =|EXTRA_GCC_OBJS = $extra_gcc_objs|" Makefile.tem > Makefile.xx
		rm -f Makefile.tem
		mv Makefile.xx Makefile.tem
	fi

	# Add a definition of USE_COLLECT2 if system wants one.
	# Also tell toplev.c what to do.
	# This substitutes for lots of t-* files.
	if [ x$use_collect2 = x ]
	then true
	else
		rm -f Makefile.xx
		(echo "USE_COLLECT2 = ld"; echo "MAYBE_USE_COLLECT2 = -DUSE_COLLECT2")\
	 	   | cat - Makefile.tem > Makefile.xx
		rm -f Makefile.tem
		mv Makefile.xx Makefile.tem
	fi
	
	# Add -DTARGET_CPU_DEFAULT for toplev.c if system wants one.
	# This substitutes for lots of *.h files.
	if [ x$target_cpu_default = x ]
	then true
	else
		rm -f Makefile.xx
	# This used cat, but [e-mail] said that ran into NFS bugs.
		sed -e "/^# Makefile for GNU C compiler./c\\
MAYBE_TARGET_DEFAULT = -DTARGET_CPU_DEFAULT=$target_cpu_default\\
\# Makefile for GNU C compiler." Makefile.tem > Makefile.xx
		rm -f Makefile.tem
		mv Makefile.xx Makefile.tem
	fi
	
	# Set MD_DEPS if the real md file is in md.pre-cpp.
	# Set MD_CPP to the cpp to pass the md file through.  Md files use ';'
	# for line oriented comments, so we must always use a GNU cpp.  If
	# building gcc with a cross compiler, use the cross compiler just
	# built.  Otherwise, we can use the cpp just built.
	if [ "x$md_cppflags" = x ]
	then
		md_file=$srcdir/config/$md_file
	else
		rm -f Makefile.xx
	  	(if [ x$host = x$build ] ; then
			echo "MD_DEPS = $(md_file) cpp" ; echo "MD_CPP = ./cpp"
		else
			echo "MD_DEPS = md.pre-cpp" ; echo "MD_CPP = \$(HOST_CC) -x c -E"