configure

gcc库的原代码,对编程有很大帮助.

#!/bin/sh
# Configuration script for GNU CC
#   Copyright (C) 1988, 90, 91, 92, 93, 94, 1995 Free Software Foundation, Inc.

#This file is part of GNU CC.

#GNU CC is free software; you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation; either version 2, or (at your option)
#any later version.

#GNU CC 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 General Public License for more details.

#You should have received a copy of the GNU General Public License
#along with GNU CC; see the file COPYING.  If not, write to
#the Free Software Foundation, 59 Temple Place - Suite 330,
#Boston, MA 02111-1307, USA.

#
# Shell script to create proper links to machine-dependent files in
# preparation for compiling gcc.
#
# Options: --srcdir=DIR		specifies directory where sources are.
# 	   --host=HOST		specifies host configuration.
#	   --target=TARGET	specifies target configuration.
#	   --build=TARGET	specifies configuration of machine you are
#				using to compile GCC.
#	   --prefix=DIR		specifies directory to install in.
#	   --local-prefix=DIR	specifies directory to put local ./include in.
#	   --gxx-include-dir=DIR specifies directory to put g++ header files in.
#	   --exec-prefix=DIR	specifies directory to install executables in.
#	   --with-gnu-ld	arrange to work with GNU ld.
#	   --with-gnu-as	arrange to work with GAS.
#	   --with-stabs		arrange to use stabs instead of host debug format.
#	   --with-elf		arrange to use elf instead of host debug format.
#	   --enable-FOO, --enable-FOO=BAR include feature FOO (parameter BAR)
#	   --disable-FOO	do not include feature FOO
#	   --nfp		assume system has no FPU.
#	   --program-prefix=PREFIX specifies prefix for executable names.
#	   --program-suffix=SUFFIX specifies suffix for executable names.
#	   --program-transform-name=SED-EXPR specifies `sed' expression to
#				apply to executable names.
#
# If configure succeeds, it leaves its status in config.status.
# If configure fails after disturbing the status quo, 
# 	config.status is removed.
#

progname=$0

# Default --srcdir to the directory where the script is found, 
# if a directory was specified.
# The second sed call is to convert `.//configure' to `./configure'.
srcdir=`echo $0 | sed 's|//|/|' | sed 's|/[^/]*$||'`
if [ x$srcdir = x$0 ]
then
srcdir=
fi

host=

# Default prefix to /usr/local.
prefix=/usr/local

# On systems where GCC is the native compiler, $prefix should be
# /usr. But the user can change it with configure --prefix=/foo/bar
native_prefix=/usr
 
# local_prefix specifies where to find the directory /usr/local/include
# We don't use $(prefix) for this
# because we always want GCC to search /usr/local/include
# even if GCC is installed somewhere other than /usr/local.
# Think THREE TIMES before specifying any other value for this!
# DO NOT make this use $prefix!
local_prefix=/usr/local
# Default is to let the Makefile set exec_prefix from $(prefix)
exec_prefix='$(prefix)'
#
# The default g++ include directory is $(libdir)/g++-include.
gxx_include_dir='$(libdir)/g++-include'

# Default --program-transform-name to nothing.
program_transform_name=
program_transform_set=

remove=rm
hard_link=ln
symbolic_link='ln -s'
copy=cp

# Record all the arguments, to write them in config.status.
arguments=$*

#for Test
#remove="echo rm"
#hard_link="echo ln"
#symbolic_link="echo ln -s"

target=
host=
build=
name1=
name2=

for arg in $*;
do
  case $next_arg in
  --srcdir)
    srcdir=$arg
    next_arg=
    ;;
  --host)
    host=$arg
    next_arg=
    ;;
  --target)
    target=$arg
    next_arg=
    ;;
  --build)
    build=$arg
    next_arg=
    ;;
  --prefix)
    prefix=$arg
    native_prefix=$prefix
    next_arg=
    ;;
  --local-prefix)
    local_prefix=$arg
    next_arg=
    ;;
  --gxx-include-dir)
    gxx_include_dir=$arg
    next_arg=
    ;;
  --exec-prefix)
    exec_prefix=$arg
    next_arg=
    ;;
  --program-transform-name)
    # Double any backslashes or dollar signs in the argument.
    if [ -n "${arg}" ] ; then
      program_transform_name="${program_transform_name} -e `echo ${arg} | sed -e 's/\\\\/\\\\\\\\/g' -e 's/\\\$/$$/g'`"
    fi
    program_transform_set=yes
    next_arg=
    ;;    
  --program-prefix)
    if [ -n "${arg}" ]; then
      program_transform_name="${program_transform_name} -e s,^,`echo ${arg} | sed -e 's/\\\\/\\\\\\\\/g' -e 's/\\\$/$$/g'`,"
    fi
    program_transform_set=yes
    next_arg=
    ;;
  --program-suffix)
    if [ -n "${arg}" ]; then
      program_transform_name="${program_transform_name} -e s,\$\$,`echo ${arg} | sed -e 's/\\\\/\\\\\\\\/g' -e 's/\\\$/$$/g'`,"
    fi
    program_transform_set=yes
    next_arg=
    ;;
  --x-*)
    next_arg=
    ;;
  *)
    case $arg in
      -*)
	if [ x$name1 != x ]
	then
		echo "Positional arguments must be last." 1>&2
		exit 1
	fi
	;;
    esac

    case $arg in
     -srcdir | --srcdir | --srcdi | --srcd | --src | --sr)
	next_arg=--srcdir
	;;
     -srcdir=* | --srcdir=* | --srcdi=* | --srcd=* | --src=* | --sr=*)
	srcdir=`echo $arg | sed 's/-*s[a-z]*=//'`
	;;
     -host | --host | --hos | --ho)
	next_arg=--host
	;;
     -host=* | --host=* | --hos=* | --ho=*)
	host=`echo $arg | sed 's/-*h[a-z]*=//'`
	;; 
     -target | --target | --targe | --targ | --tar | --ta | --t)
	next_arg=--target
	;;
     -target=* | --target=* | --targe=* | --targ=* | --tar=* | --ta=* | --t=*)
	target=`echo $arg | sed 's/-*t[a-z]*=//'`
	;; 
     -build | --build | --buil | --bui | --bu | --b)
	next_arg=--build
	;;
     -build=* | --build=* | --buil=* | --bui=* | --bu=* | --b=*)
	build=`echo $arg | sed 's/-*b[a-z]*=//'`
	;; 
     -prefix | --prefix | --prefi | --pref | --pre | --pr | --p)
	next_arg=--prefix
	;;
     -prefix=* | --prefix=* | --prefi=* | --pref=* | --pre=* | --pr=* | --p=*)
	prefix=`echo $arg | sed 's/-*p[a-z]*=//'`
	native_prefix=$prefix
	;;
     -local-prefix | --local-prefix | --local-prefi | --local-pref | --local-pre \
	| --local-pr | --local-p | --local- | --local | --loc | --lo | --l)
	next_arg=--local-prefix
	;;
     -local-prefix=* | --local-prefix=* | --local-prefi=* | --local-pref=* \
	| --local-pre=* | --local-pr=* | --local-p=* | --local-=* | --local=* \
	| --loc=* | --lo=* | --l=*)
	local_prefix=`echo $arg | sed 's/-*l[-a-z]*=//'`
	;;
     -gxx-include-dir | --gxx-include-dir | --gxx-include \
	| --gxx-incl | --gxx-inc | --gxx-in | --gxx-i | --gxx- \
	| --gxx | --gxx | --gx | --g)
	next_arg=--gxx-include-dir
	;;
     -gxx-include-dir=* | --gxx-include-dir=* | --gxx-include=* \
	| --gxx-incl=* | --gxx-inc=* | --gxx-in=* | --gxx-i=* \
	| --gxx-=* | --gxx=* | --gxx=* | --gxx=* | --g=*)
	gxx_include_dir=`echo $arg | sed 's/-*g[-a-z]*=//'`
	;;
     -exec-prefix | --exec-prefix | --exec-prefi | --exec-pref | --exec-pre \
	| --exec-pr | --exec-p | --exec- | --exec | --exe | --ex | --e)
	next_arg=--exec-prefix
	;;
     -exec-prefix=* | --exec-prefix=* | --exec-prefi=* | --exec-pref=* \
	| --exec-pre=* | --exec-pr=* | --exec-p=* | --exec-=* | --exec=* \
	| --exe=* | --ex=* | --e=*)
	exec_prefix=`echo $arg | sed 's/-*e[-a-z]*=//'`
	;;
     -program-transform-name | --program-transform-name \
	| --program-transform-nam | --program-transform-na \
	| --program-transform-n | --program-transform- | --program-transform \
	| --program-transfor | --program-transfo | --program-transf \
	| --program-trans | --program-tran | --program-tra \
	| --program-tr | --program-t)
	next_arg=--program-transform-name
	;;
     -program-transform-name=* | --program-transform-name=* \
	| --program-transform-nam=* | --program-transform-na=* \
	| --program-transform-n=* | --program-transform-=* \
	| --program-transform=* | --program-transfor=* | --program-transfo=* \
	| --program-transf=* | --program-trans=* | --program-tran=* \
	| --program-tra=* | --program-tr=* | --program-t=*)
	arg=`echo ${arg} | sed -e 's/^[-a-z_]*=//'`
	# Double any \ or $ in the argument.
	if [ -n "${arg}" ] ; then
	  program_transform_name="${program_transform_name} -e `echo ${arg} | sed -e 's/\\\\/\\\\\\\\/g' -e 's/\\\$/$$/g'`"
	fi
	program_transform_set=yes
	;;
     -program-prefix | --program-prefix | --program-prefi \
	| --program-pref | --program-pre | --program-pr \
	| --program-p)
	next_arg=--program-prefix
	;;
     -program-prefix=* | --program-prefix=* | --program-prefi=* \
	| --program-pref=* | --program-pre=* | --program-pr=* \
	| --program-p=*)
	arg=`echo ${arg} | sed -e 's/^[-a-z_]*=//'`
	if [ -n "${arg}" ]; then
	  program_transform_name="${program_transform_name} -e s,^,`echo ${arg} | sed -e 's/\\\\/\\\\\\\\/g' -e 's/\\\$/$$/g'`,"
	fi
	program_transform_set=yes
	;;
     -program-suffix | --program-suffix | --program-suffi \
	| --program-suff | --program-suf | --program-su \
	| --program-s)
	next_arg=--program-suffix
	;;
     -program-suffix=* | --program-suffix=* | --program-suffi=* \
	| --program-suff=* | --program-suf=* | --program-su=* \
	| --program-s=*)
	arg=`echo ${arg} | sed -e 's/^[-a-z_]*=//'`
	if [ -n "${arg}" ]; then
	  program_transform_name="${program_transform_name} -e s,\$\$,`echo ${arg} | sed -e 's/\\\\/\\\\\\\\/g' -e 's/\\\$/$$/g'`,"
	fi
	program_transform_set=yes
	;;
     -with-gnu-ld | --with-gnu-ld | --with-gnu-l)
	gnu_ld=yes
	;;
     -gas | --gas | --ga | --g | -with-gnu-as | --with-gnu-as | -with-gnu-a)
        gas=yes
	;;
     -nfp | --nfp | --nf | --n)
	nfp=yes
	;;
     -with-stabs | -with-stab | -with-sta | -with-st | -with-s \
	| --with-stabs | --with-stab | --with-sta | --with-st | --with-s \
	| -stabs | -stab | -sta | -st  \
	| --stabs | --stab | --sta | --st)
	stabs=yes
	;;
     -with-elf | -with-el | -with-se \
	| --with-elf | --with-el | --with-e \
	| -elf | -el | -e \
	|--elf | --el | --e)
	elf=yes
	;;
     -with-* | --with-*) ;; #ignored
     -without-* | --without-*) ;; #ignored
     -disable-* | --disable-*)
	enableopt=`echo ${arg} | sed 's:^-*disable-:enable_:;s:-:_:g'`
	eval $enableopt=no
	;;
     -enable-* | --enable-*)
	case "$arg" in
	*=*)	optarg=`echo $arg | sed 's:^[^=]*=::;s:-:_:g'` ;;
	*)	optarg=yes ;;
	esac
	enableopt=`echo ${arg} | sed 's:^-*::;s:=.*$::;s:-:_:g'`
	eval $enableopt="$optarg"
	;;
     -x | --x) ;; # ignored
     -x-*=* | --x-*=*) ;; # ignored
     -x-* | --x-*)
	next_arg=--x-ignored # ignored
	;;
     --he*) ;; # ignored for now (--help)
     --vers*) ;; # ignored for now (--version)
     -v | -verb* | --verb*) ;; # ignored for now (--verbose)
     --program-*) ;; #ignored (--program-prefix, --program-suffix)
     --c*) ;; #ignored (--cache-file)
     --q*) ;; #ignored (--quiet)
     --si*) ;; #ignored (--silent)
     -*)
	echo "Invalid option \`$arg'" 1>&2
	exit 1
	;;
     *)
# Allow configure HOST TARGET.  If just one name is given, it is used
# as both unless a host was previously given, in which case it is
# just the target.
	if [ x$name1 != x ]
	then
		if [ x$name2 != x ]
		then
			echo "More than two configuration names." 1>&2
			exit 1
		fi
		name2=$arg
	elif [ x$host != x ]
	then
		name1=$host
		name2=$arg
		host=
	else
		name1=$arg
	fi
	;;
    esac
  esac
done

if [ x$name1 != x ]
then
	if [ x$name2 = x ]
	then
		name2=$name1
	fi

	if [ x$host != x ]
	then
		echo "Duplicate specification of host." 1>&2
		exit 1
	fi

	if [ x$target != x ]
	then
		echo "Duplicate specification of target." 1>&2
		exit 1
	fi

	host=$name1
	build=$name1
	target=$name2
fi

# Find the source files, if location was not specified.
if [ x$srcdir = x ]
then
	srcdirdefaulted=1
	srcdir=.
	if [ ! -r tree.c ]
	then
		srcdir=..
	fi
fi

if [ ! -r ${srcdir}/tree.c ]
then
	if [ x$srcdirdefaulted = x ]
	then
	  echo "$progname: Can't find compiler sources in \`${srcdir}'" 1>&2
	else
	  echo "$progname: Can't find compiler sources in \`.' or \`..'" 1>&2
	fi
	exit 1
fi

if [ -r ${srcdir}/config.status ] && [ x$srcdir != x. ]
then
	echo "$progname: \`configure' has been run in \`${srcdir}'" 1>&2
	exit 1
fi

# Complain if an arg is missing
if [ x$build = x ]
then
	# If host was specified, always use it for build also to avoid
	# confusion.  If someone wants a cross compiler where build != host,
	# then they must specify build explicitly.  Since this case is
	# extremely rare, it does not matter that it is slightly inconvenient.
	if [ x$host != x ]
	then
		build=$host
	
	# This way of testing the result of a command substitution is
	# defined by Posix.2 (section 3.9.1) as well as traditional shells.
	elif build=`${srcdir}/config.guess`
	then
		echo "This appears to be a ${build} system." 1>&2

	elif [ x$target != x ]
	then
		echo 'Config.guess failed to determine the host type.  Defaulting to target.'
		build=$target
	else
		echo 'Config.guess failed to determine the host type.  You need to specify one.' 1>&2
		echo "\
Usage: `basename $progname` [--host=HOST] [--build=BUILD]
       [--prefix=DIR] [--gxx-include-dir=DIR] [--local-pref=DIR] [--exec-pref=DIR]
       [--with-gnu-as] [--with-gnu-ld] [--with-stabs] [--with-elf] [--nfp] TARGET" 1>&2
	echo "Where HOST, TARGET and BUILD are three-part configuration names " 1>&2
		if [ -r config.status ]
		then
			tail +2 config.status 1>&2
		fi
		exit 1
	fi
fi

# If $host was not specified, use $build.
if [ x$host = x ]
then
	host=$build
fi

# If $target was not specified, use $host.
if [ x$target = x ]
then
	target=$host
fi

build_xm_file=
host_xm_file=
host_xmake_file=
host_broken_install=
host_install_headers_dir=install-headers-tar
host_truncate_target=

# Validate the specs, and canonicalize them.
canon_build=`/bin/sh $srcdir/config.sub $build` || exit 1
canon_host=`/bin/sh $srcdir/config.sub $host` || exit 1
canon_target=`/bin/sh $srcdir/config.sub $target` || exit 1

# Decode the host machine, then the target machine.
# For the host machine, we save the xm_file variable as host_xm_file;
# then we decode the target machine and forget everything else
# that came from the host machine.
for machine in $canon_build $canon_host $canon_target; do

	cpu_type=
	xm_file=
	tm_file=
	out_file=
	xmake_file=
	tmake_file=
	extra_headers=
	extra_passes=
	extra_parts=
	extra_programs=
	extra_objs=
	extra_gcc_objs=
	# Set this to force installation and use of collect2.
	use_collect2=
	# Set this to override the default target model.
	target_cpu_default=
	# Set this to force use of install.sh.
	broken_install=
	# Set this to control which fixincludes program to use.
	fixincludes=fixincludes
	# Set this to control how the header file directory is installed.
	install_headers_dir=install-headers-tar
	# Set this to a non-empty list of args to pass to cpp if the target
	# wants its .md file passed through cpp.
	md_cppflags=
	# Set this if directory names should be truncated to 14 characters.
	truncate_target=
	# Set this if gdb needs a dir command with `dirname $out_file`
	gdb_needs_out_file_path=

	case $machine in
	# Support site-specific machine types.
	*local*)
		cpu_type=`echo $machine | sed -e 's/-.*//'`
		rest=`echo $machine | sed -e "s/$cpu_type-//"`
		xm_file=${cpu_type}/xm-$rest.h
		tm_file=${cpu_type}/$rest.h
		if [ -f $srcdir/config/${cpu_type}/x-$rest ] ; \
		then xmake_file=${cpu_type}/x-$rest; \
		else true; \
		fi
		if [ -f $srcdir/config/${cpu_type}/t-$rest ] ; \
		then tmake_file=${cpu_type}/t-$rest; \
		else true; \
		fi
		;;
	1750a-*-*)
		;;
	a29k-*-bsd* | a29k-*-sym1*)
		tm_file=a29k/unix.h
		xm_file=a29k/xm-unix.h
		xmake_file=a29k/x-unix
		tmake_file=a29k/t-a29k
		use_collect2=yes
		;;
	a29k-*-udi | a29k-*-coff)
		tmake_file=a29k/t-a29kbare
		tm_file=a29k/a29k-udi.h
		;;
	a29k-*-vxworks*)
		tmake_file=a29k/t-vx29k
		tm_file=a29k/vx29k.h
		extra_parts="crtbegin.o crtend.o"
		;;
	a29k-*-*)			# Default a29k environment.
		use_collect2=yes
		;;
	alpha-dec-osf[23456789]*)
		tm_file=alpha/osf2.h
		if [ x$stabs = xyes ]
		then
			tm_file=alpha/gdb-osf2.h
		fi
		if [ x$gas != xyes ]
		then
			extra_passes="mips-tfile mips-tdump"
		fi