configure

gcc库的原代码,对编程有很大帮助.

				extra_parts="svr3.ifile svr3z.rfile"
			else
				tm_file=i386/svr3gas.h
				extra_parts="crtbegin.o crtend.o"
				tmake_file=i386/t-crtstuff
			fi
		else
			tm_file=i386/sysv3.h
			extra_parts="crtbegin.o crtend.o"
			tmake_file=i386/t-crtstuff
		fi
		;;
	i386-*-vsta)			# Intel 80386's running VSTa kernel
		xm_file=i386/xm-vsta.h
		tm_file=i386/vsta.h
		tmake_file=i386/t-vsta
		xmake_file=i386/x-vsta
		;;
	i[345]86-*-winnt3*)
		cpu_type=i386
		tm_file=i386/win-nt.h
		out_file=i386/i386.c
		xm_file=i386/xm-winnt.h
		xmake_file=winnt/x-winnt
		tmake_file=i386/t-winnt
		extra_objs="winnt.o oldnames.o"
		extra_gcc_objs="spawnv.o oldnames.o"
		fixincludes=fixinc.winnt
		if [ x$gnu_ld != xyes ]
		then
			extra_programs=ld.exe
		fi
		;;
	i860-alliant-*)		# Alliant FX/2800
		xm_file=i860/xm-fx2800.h
		xmake_file=i860/x-fx2800
		tm_file=i860/fx2800.h
		tmake_file=i860/t-fx2800
		extra_parts="crtbegin.o crtend.o"
		;;
	i860-*-bsd*)
		if [ x$gas = xyes ]
		then
			tm_file=i860/bsd-gas.h
		else
			tm_file=i860/bsd.h
		fi
		use_collect2=yes
		;;
	i860-*-mach*)
		xm_file=i860/xm-i860.h
		tm_file=i860/mach.h
		tmake_file=t-libc-ok
		;;
	i860-*-osf*)			# Intel Paragon XP/S, OSF/1AD
		xm_file=i860/xm-paragon.h
		tm_file=i860/paragon.h
		tmake_file=t-osf
		broken_install=yes
		;;
	i860-*-sysv3*)
		xm_file=i860/xm-sysv3.h
		xmake_file=i860/x-sysv3
		tm_file=i860/sysv3.h
		extra_parts="crtbegin.o crtend.o"
		;;
	i860-*-sysv4*)
		xm_file=i860/xm-sysv4.h
		xmake_file=i860/x-sysv4
		tm_file=i860/sysv4.h
		tmake_file=t-svr4
		extra_parts="crtbegin.o crtend.o"
		;;
	i960-wrs-vxworks5 | i960-wrs-vxworks5.0*)
		tmake_file=i960/t-vxworks960
		tm_file=i960/vx960.h
		use_collect2=yes
		;;
	i960-wrs-vxworks5*)
		tmake_file=i960/t-vxworks960
		tm_file=i960/vx960-coff.h
		use_collect2=yes
		;;
	i960-wrs-vxworks*)
		tmake_file=i960/t-vxworks960
		tm_file=i960/vx960.h
		use_collect2=yes
		;;
	i960-*-coff*)
		tmake_file=i960/t-960bare
		tm_file=i960/i960-coff.h
		use_collect2=yes
		;;
	i960-*-*)			# Default i960 environment.
		use_collect2=yes
		;;
	m68000-convergent-sysv*)
		cpu_type=m68k
		xm_file=m68k/xm-3b1.h
		tm_file=m68k/ctix.h
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68000-hp-bsd*)			# HP 9000/200 running BSD
		cpu_type=m68k
		tm_file=m68k/hp2bsd.h
		xmake_file=m68k/x-hp2bsd
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68000-hp-hpux*)		# HP 9000 series 300
		cpu_type=m68k
		xm_file=m68k/xm-hp320.h
		if [ x$gas = xyes ]
		then
			xmake_file=m68k/x-hp320g
			tm_file=m68k/hp310g.h
		else
			xmake_file=m68k/x-hp320
			tm_file=m68k/hp310.h
		fi
		broken_install=yes
		install_headers_dir=install-headers-cpio
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68000-sun-sunos3*)
		cpu_type=m68k
		tm_file=m68k/sun2.h
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68000-sun-sunos4*)
		cpu_type=m68k
		tm_file=m68k/sun2o4.h
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68000-att-sysv*)
		cpu_type=m68k
		xm_file=m68k/xm-3b1.h
		if [ x$gas = xyes ]
		then
			tm_file=m68k/3b1g.h
		else
			tm_file=m68k/3b1.h
		fi
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-apollo-*)
		xmake_file=m68k/x-apollo68
		tm_file=m68k/apollo68.h
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-altos-sysv*)		   # Altos 3068
		if [ x$gas = xyes ]
		then
		        xm_file=m68k/xm-altos3068.h
		        tm_file=m68k/altos3068.h
		else
			echo "The Altos is supported only with the GNU assembler" 1>&2
			exit 1
		fi
		extra_headers=math-68881.h
	        ;;
	m68k-bull-sysv*)		# Bull DPX/2
		if [ x$gas = xyes ]
		then
			if [ x$stabs = xyes ]
			then
				tm_file=m68k/dpx2cdbx.h
			else
				tm_file=m68k/dpx2g.h
			fi
		else
			tm_file=m68k/dpx2.h
		fi
		xm_file=m68k/xm-m68kv.h
		xmake_file=m68k/x-dpx2
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-atari-sysv4*)              # Atari variant of V.4.
		tm_file=m68k/atari.h
		xm_file=m68k/xm-atari.h
		tmake_file=t-svr4
		extra_parts="crtbegin.o crtend.o"
		extra_headers=math-68881.h
		;;
	m68k-motorola-sysv*)
		xm_file=m68k/xm-mot3300.h
		xmake_file=m68k/x-mot3300
		if [ x$gas = xyes ]
		then
			tm_file=m68k/mot3300g.h
		else
			tm_file=m68k/mot3300.h
			gdb_needs_out_file_path=yes
		fi
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-ncr-sysv*)			# NCR Tower 32 SVR3
		tm_file=m68k/tower-as.h
		xm_file=m68k/xm-tower.h
		xmake_file=m68k/x-tower
		extra_parts="crtbegin.o crtend.o"
		extra_headers=math-68881.h
		;;
        m68k-plexus-sysv*)
		tm_file=m68k/plexus.h
		xm_file=m68k/xm-plexus.h
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-tti-*)
		tm_file=m68k/pbb.h
		xm_file=m68k/xm-m68kv.h
		extra_headers=math-68881.h
		;;
	m68k-crds-unos*)
		xm_file=m68k/xm-crds.h
		xmake_file=m68k/x-crds
		tm_file=m68k/crds.h
		broken_install=yes
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-cbm-sysv4*)		# Commodore variant of V.4.
		tm_file=m68k/amix.h
		xm_file=m68k/xm-amix.h
		xmake_file=m68k/x-amix
		tmake_file=t-svr4
		extra_parts="crtbegin.o crtend.o"
		extra_headers=math-68881.h
		;;
	m68k-ccur-rtu)
		tm_file=m68k/ccur-GAS.h
		xmake_file=m68k/x-ccur
		extra_headers=math-68881.h
		use_collect2=yes
		broken_install=yes
		;;
	m68k-hp-bsd4.4*)		# HP 9000/3xx running 4.4bsd
		tm_file=m68k/hp3bsd44.h
		xmake_file=m68k/x-hp3bsd44
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-hp-bsd*)			# HP 9000/3xx running Berkeley Unix
		tm_file=m68k/hp3bsd.h
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-isi-bsd*)
		if [ x$nfp = xyes ]
		then
			tm_file=m68k/isi-nfp.h
		else
			tm_file=m68k/isi.h
		fi
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-hp-hpux7*)	# HP 9000 series 300 running HPUX version 7.
		xm_file=m68k/xm-hp320.h
		if [ x$gas = xyes ]
		then
			xmake_file=m68k/x-hp320g
			tm_file=m68k/hp320g.h
		else
			xmake_file=m68k/x-hp320
			tm_file=m68k/hpux7.h
		fi
		broken_install=yes
		install_headers_dir=install-headers-cpio
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-hp-hpux*)	# HP 9000 series 300
		xm_file=m68k/xm-hp320.h
		if [ x$gas = xyes ]
		then
			xmake_file=m68k/x-hp320g
			tm_file=m68k/hp320g.h
		else
			xmake_file=m68k/x-hp320
			tm_file=m68k/hp320.h
		fi
		broken_install=yes
		install_headers_dir=install-headers-cpio
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-sun-mach*)
		tm_file=m68k/sun3mach.h
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-sony-newsos3*)
		if [ x$gas = xyes ]
		then
			tm_file=m68k/news3gas.h
		else
			tm_file=m68k/news3.h
		fi
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-sony-bsd* | m68k-sony-newsos*)
		if [ x$gas = xyes ]
		then
			tm_file=m68k/newsgas.h
		else
			tm_file=m68k/news.h
		fi
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-next-nextstep2*)
		tm_file=m68k/next21.h
		out_file=m68k/next.c
		xm_file=m68k/xm-next.h
		tmake_file=m68k/t-next
		xmake_file=m68k/x-next
		extra_headers=math-68881.h
		use_collect2=yes
                ;;
	m68k-next-nextstep3*)
		tm_file=m68k/next.h
		out_file=m68k/next.c
		xm_file=m68k/xm-next.h
		tmake_file=m68k/t-next
		xmake_file=m68k/x-next
		extra_headers=math-68881.h
		;;
	m68k-sun-sunos3*)
		if [ x$nfp = xyes ]
		then
			tm_file=m68k/sun3n3.h
		else
			tm_file=m68k/sun3o3.h
		fi
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-sun-sunos*)			# For SunOS 4 (the default).
		if [ x$nfp = xyes ]
		then
			tm_file=m68k/sun3n.h
		else
			tm_file=m68k/sun3.h
		fi
		use_collect2=yes
		extra_headers=math-68881.h
		;;
	m68k-wrs-vxworks*)
		tm_file=m68k/vxm68k.h
		tmake_file=m68k/t-vxworks68
		extra_headers=math-68881.h
		;;
	m68k-*-aout*)
		tmake_file=m68k/t-m68kbare
		tm_file=m68k/m68k-aout.h
		extra_headers=math-68881.h
		;;
	m68k-*-coff*)
		tmake_file=m68k/t-m68kbare
		tm_file=m68k/m68k-coff.h
		extra_headers=math-68881.h
		;;
	m68k-*-lynxos*)
		if [ x$gas = xyes ]
		then
			tm_file=m68k/lynx.h
		else
			tm_file=m68k/lynx-ng.h
		fi
		xm_file=m68k/xm-lynx.h
		xmake_file=x-lynx
		tmake_file=m68k/t-lynx
		extra_headers=math-68881.h
		;;
	m68k-*-netbsd*)
		cpu_type=m68k
		tm_file=m68k/netbsd.h
		xm_file=m68k/xm-netbsd.h
		# On NetBSD, the headers are already okay.
		fixincludes=Makefile.in
		tmake_file=t-libc-ok
		xmake_file=x-netbsd
		;;
	m68k-*-sysv3*)			# Motorola m68k's running system V.3
		xm_file=m68k/xm-m68kv.h
		xmake_file=m68k/x-m68kv
		extra_parts="crtbegin.o crtend.o"
		extra_headers=math-68881.h
		;;
	m68k-*-sysv4*)			# Motorola m68k's running system V.4
		tm_file=m68k/m68kv4.h
		xm_file=m68k/xm-m68kv.h
		tmake_file=t-svr4
		extra_parts="crtbegin.o crtend.o"
		extra_headers=math-68881.h
		;;
	m68k-*-linux*aout*)		# Motorola m68k's running Linux
		xm_file=m68k/xm-linux.h	# with a.out format
		xmake_file=x-linux
		tm_file=m68k/linux-aout.h
		tmake_file=m68k/t-linux
		fixincludes=Makefile.in #On Linux, the headers are ok already.
		extra_headers=math-68881.h
		gnu_ld=yes
		;;
	m68k-*-linux*)			# Motorola m68k's running Linux
		xm_file=m68k/xm-linux.h	# with ELF format
		xmake_file=x-linux
		tm_file=m68k/linux.h
		tmake_file=m68k/t-linux
		fixincludes=Makefile.in #On Linux, the headers are ok already.
		extra_headers=math-68881.h
		gnu_ld=yes
		# Don't use it. Linux uses a slightly different one.
		# The real one comes with the Linux C library.
		#extra_parts="crtbegin.o crtend.o"
		;;
	m88k-dg-dgux*)
		case $machine in
		  m88k-dg-dguxbcs*)
		    tm_file=m88k/dguxbcs.h
		    xmake_file=m88k/x-dguxbcs
		    ;;
		  *)
		    tm_file=m88k/dgux.h
		    xmake_file=m88k/x-dgux
		    ;;
		esac
		extra_parts="crtbegin.o bcscrtbegin.o crtend.o m88kdgux.ld"
		broken_install=yes
		if [ x$gas = xyes ]
		then
			tmake_file=m88k/t-dgux-gas
		else
			tmake_file=m88k/t-dgux
		fi
		fixincludes=fixinc.dgux
		;;
	m88k-dolphin-sysv3*)
		tm_file=m88k/dolph.h
		extra_parts="crtbegin.o crtend.o"
		xm_file=m88k/xm-sysv3.h
		xmake_file=m88k/x-dolph
		if [ x$gas = xyes ]
		then
			tmake_file=m88k/t-m88k-gas
		fi
		;;
	m88k-tektronix-sysv3)
		tm_file=m88k/tekXD88.h
		extra_parts="crtbegin.o crtend.o"
		xm_file=m88k/xm-sysv3.h
		xmake_file=m88k/x-tekXD88
		if [ x$gas = xyes ]
		then
			tmake_file=m88k/t-m88k-gas
		fi
		;;
	m88k-*-aout*)
		cpu_type=m88k
		tm_file=m88k/m88k-aout.h
		;;
	m88k-*-coff*)
		cpu_type=m88k
		tm_file=m88k/m88k-coff.h
		tmake_file=m88k/t-bug
		;;
	m88k-*-luna*)
		tm_file=m88k/luna.h
		extra_parts="crtbegin.o crtend.o"
		if [ x$gas = xyes ]
		then
			tmake_file=m88k/t-luna-gas
		else
			tmake_file=m88k/t-luna
		fi
		;;
	m88k-*-sysv3*)
		tm_file=m88k/sysv3.h
		extra_parts="crtbegin.o crtend.o"
		xm_file=m88k/xm-sysv3.h
		xmake_file=m88k/x-sysv3
		if [ x$gas = xyes ]
		then
			tmake_file=m88k/t-m88k-gas
		fi
		;;
	m88k-*-sysv4*)
		tm_file=m88k/sysv4.h
		extra_parts="crtbegin.o crtend.o"
		xmake_file=m88k/x-sysv4
		tmake_file=m88k/t-sysv4
		;;
	mips-sgi-irix6*)		# SGI System V.4., IRIX 6
		tm_file=mips/iris6.h
		xm_file=mips/xm-iris6.h
		broken_install=yes
		fixincludes=Makefile.in
		xmake_file=mips/x-iris6
		tmake_file=mips/t-iris6
		# See comment in mips/iris[56].h files.
		use_collect2=yes
		;;
	mips-sgi-irix5cross64)		# Irix5 host, Irix 6 target, cross64
		tm_file=mips/cross64.h
		xm_file=mips/xm-iris5.h
		broken_install=yes
		fixincludes=Makefile.in
		xmake_file=mips/x-iris
		tmake_file=mips/t-cross64
		# See comment in mips/iris[56].h files.
		use_collect2=yes
		;;
	mips-sgi-irix5*)		# SGI System V.4., IRIX 5
		if [ x$gas = xyes ]
		then
			if [ x$stabs = xyes ]
			then
				tm_file=mips/iris5gdb.h
			else
				tm_file=mips/iris5gas.h
			fi
		else
			tm_file=mips/iris5.h
		fi
		xm_file=mips/xm-iris5.h
		broken_install=yes
		fixincludes=Makefile.in
		xmake_file=mips/x-iris
		# mips-tfile doesn't work yet
		tmake_file=mips/t-mips-gas
		# See comment in mips/iris5.h file.
		use_collect2=yes
		;;
	mips-sgi-irix4loser*)		# Mostly like a MIPS.
		if [ x$stabs = xyes ]; then
			tm_file=mips/iris4gl.h
		else
			tm_file=mips/iris4loser.h
		fi
		xm_file=mips/xm-iris4.h
		broken_install=yes
		xmake_file=mips/x-iris
		if [ x$gas = xyes ]
		then
			tmake_file=mips/t-mips-gas
		else
			extra_passes="mips-tfile mips-tdump"