ltmain.sh

常好且全面的jpeg图像压缩算法

# ltmain.sh - Provide generalized library-building support services.
# NOTE: Changing this file will not affect anything until you rerun ltconfig.
#
# Copyright (C) 1996-1998 Free Software Foundation, Inc.
# Gordon Matzigkeit <[e-mail]>, 1996
#
# This program 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 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# As a special exception to the GNU General Public License, if you
# distribute this file as part of a program that contains a
# configuration script generated by Autoconf, you may include it under
# the same distribution terms that you use for the rest of that program.

# The name of this program.
progname=`$echo "$0" | sed 's%^.*/%%'`
modename="$progname"

# Constants.
PROGRAM=ltmain.sh
PACKAGE=libtool
VERSION=1.2

default_mode=
help="Try \`$progname --help' for more information."
magic="%%%MAGIC variable%%%"
mkdir="mkdir"
mv="mv -f"
rm="rm -f"

# Sed substitution that helps us do robust quoting.  It backslashifies
# metacharacters that are still active within double-quoted strings.
Xsed='sed -e s/^X//'
sed_quote_subst='s/\([\\`\\"$\\\\]\)/\\\1/g'

# NLS nuisances.
# Only set LANG and LC_ALL to C if already set.
# These must not be set unconditionally because not all systems understand
# e.g. LANG=C (notably SCO).
if test "${LC_ALL+set}" = set; then LC_ALL=C; export LC_ALL; fi
if test "${LANG+set}"   = set; then LANG=C;   export LANG;   fi

if test "$LTCONFIG_VERSION" != "$VERSION"; then
  echo "$modename: ltconfig version \`$LTCONFIG_VERSION' does not match $PROGRAM version \`$VERSION'" 1>&2
  echo "Fatal configuration error.  See the $PACKAGE docs for more information." 1>&2
  exit 1
fi

if test "$build_libtool_libs" != yes && test "$build_old_libs" != yes; then
  echo "$modename: not configured to build any kind of library" 1>&2
  echo "Fatal configuration error.  See the $PACKAGE docs for more information." 1>&2
  exit 1
fi

# Global variables.
mode=$default_mode
nonopt=
prev=
prevopt=
run=
show="$echo"
show_help=
execute_dlfiles=

# Parse our command line options once, thoroughly.
while test $# -gt 0
do
  arg="$1"
  shift

  case "$arg" in
  -*=*) optarg=`$echo "X$arg" | $Xsed -e 's/[-_a-zA-Z0-9]*=//'` ;;
  *) optarg= ;;
  esac

  # If the previous option needs an argument, assign it.
  if test -n "$prev"; then
    case "$prev" in
    execute_dlfiles)
      eval "$prev=\"\$$prev \$arg\""
      ;;
    *)
      eval "$prev=\$arg"
      ;;
    esac

    prev=
    prevopt=
    continue
  fi

  # Have we seen a non-optional argument yet?
  case "$arg" in
  --help)
    show_help=yes
    ;;

  --version)
    echo "$PROGRAM (GNU $PACKAGE) $VERSION"
    exit 0
    ;;

  --dry-run | -n)
    run=:
    ;;

  --features)
    echo "host: $host"
    if test "$build_libtool_libs" = yes; then
      echo "enable shared libraries"
    else
      echo "disable shared libraries"
    fi
    if test "$build_old_libs" = yes; then
      echo "enable static libraries"
    else
      echo "disable static libraries"
    fi
    exit 0
    ;;

  --finish) mode="finish" ;;

  --mode) prevopt="--mode" prev=mode ;;
  --mode=*) mode="$optarg" ;;

  --quiet | --silent)
    show=:
    ;;

  -dlopen)
    prevopt="-dlopen"
    prev=execute_dlfiles
    ;;

  -*)
    $echo "$modename: unrecognized option \`$arg'" 1>&2
    $echo "$help" 1>&2
    exit 1
    ;;

  *)
    nonopt="$arg"
    break
    ;;
  esac
done

if test -n "$prevopt"; then
  $echo "$modename: option \`$prevopt' requires an argument" 1>&2
  $echo "$help" 1>&2
  exit 1
fi

if test -z "$show_help"; then

  # Infer the operation mode.
  if test -z "$mode"; then
    case "$nonopt" in
    *cc | *++ | gcc* | *-gcc*)
      mode=link
      for arg
      do
        case "$arg" in
        -c)
           mode=compile
           break
           ;;
        esac
      done
      ;;
    *db | *dbx)
      mode=execute
      ;;
    *install*|cp|mv)
      mode=install
      ;;
    *rm)
      mode=uninstall
      ;;
    *)
      # If we have no mode, but dlfiles were specified, then do execute mode.
      test -n "$execute_dlfiles" && mode=execute

      # Just use the default operation mode.
      if test -z "$mode"; then
        if test -n "$nonopt"; then
          $echo "$modename: warning: cannot infer operation mode from \`$nonopt'" 1>&2
        else
          $echo "$modename: warning: cannot infer operation mode without MODE-ARGS" 1>&2
        fi
      fi
      ;;
    esac
  fi

  # Only execute mode is allowed to have -dlopen flags.
  if test -n "$execute_dlfiles" && test "$mode" != execute; then
    $echo "$modename: unrecognized option \`-dlopen'" 1>&2
    $echo "$help" 1>&2
    exit 1
  fi

  # Change the help message to a mode-specific one.
  generic_help="$help"
  help="Try \`$modename --help --mode=$mode' for more information."

  # These modes are in order of execution frequency so that they run quickly.
  case "$mode" in
  # libtool compile mode
  compile)
    modename="$modename: compile"
    # Get the compilation command and the source file.
    base_compile=
    lastarg=
    srcfile="$nonopt"
    suppress_output=

    for arg
    do
      # Accept any command-line options.
      case "$arg" in
      -o)
	$echo "$modename: you cannot specify the output filename with \`-o'" 1>&2
	$echo "$help" 1>&2
	exit 1
	;;

      -static)
	build_libtool_libs=no
	build_old_libs=yes
	continue
	;;
      esac

      # Accept the current argument as the source file.
      lastarg="$srcfile"
      srcfile="$arg"

      # Aesthetically quote the previous argument.

      # Backslashify any backslashes, double quotes, and dollar signs.
      # These are the only characters that are still specially
      # interpreted inside of double-quoted scrings.
      lastarg=`$echo "X$lastarg" | $Xsed -e "$sed_quote_subst"`

      # Double-quote args containing other shell metacharacters.
      # Many Bourne shells cannot handle close brackets correctly in scan
      # sets, so we specify it separately.
      case "$lastarg" in
      *[\[\~\#\^\&\*\(\)\{\}\|\;\<\>\?\'\ \	]*|*]*)
	lastarg="\"$lastarg\""
	;;
      esac

      # Add the previous argument to base_compile.
      if test -z "$base_compile"; then
	base_compile="$lastarg"
      else
	base_compile="$base_compile $lastarg"
      fi
    done

    # Get the name of the library object.
    libobj=`$echo "X$srcfile" | $Xsed -e 's%^.*/%%'`

    # Recognize several different file suffixes.
    xform='[cCFSfms]'
    case "$libobj" in
    *.ada) xform=ada ;;
    *.adb) xform=adb ;;
    *.ads) xform=ads ;;
    *.asm) xform=asm ;;
    *.c++) xform=c++ ;;
    *.cc) xform=cc ;;
    *.cpp) xform=cpp ;;
    *.cxx) xform=cxx ;;
    *.f90) xform=f90 ;;
    *.for) xform=for ;;
    esac

    libobj=`$echo "X$libobj" | $Xsed -e "s/\.$xform$/.lo/"`

    case "$libobj" in
    *.lo) obj=`$echo "X$libobj" | $Xsed -e 's/\.lo$/.o/'` ;;
    *)
      $echo "$modename: cannot determine name of library object from \`$srcfile'" 1>&2
      exit 1
      ;;
    esac

    if test -z "$base_compile"; then
      $echo "$modename: you must specify a compilation command" 1>&2
      $echo "$help" 1>&2
      exit 1
    fi

    # Delete any leftover library objects.
    if test "$build_old_libs" = yes; then
      $run $rm $obj $libobj
      trap "$run $rm $obj $libobj; exit 1" 1 2 15
    else
      $run $rm $libobj
      trap "$run $rm $libobj; exit 1" 1 2 15
    fi

    # Only build a PIC object if we are building libtool libraries.
    if test "$build_libtool_libs" = yes; then
      # Without this assignment, base_compile gets emptied.
      fbsd_hideous_sh_bug=$base_compile

      # All platforms use -DPIC, to notify preprocessed assembler code.
      $show "$base_compile$pic_flag -DPIC $srcfile"
      if $run eval "$base_compile\$pic_flag -DPIC \$srcfile"; then :
      else
        test -n "$obj" && $run $rm $obj
        exit 1
      fi

      # If we have no pic_flag, then copy the object into place and finish.
      if test -z "$pic_flag"; then
        $show "$LN_S $obj $libobj"
        $run $LN_S $obj $libobj
        exit $?
      fi

      # Just move the object, then go on to compile the next one
      $show "$mv $obj $libobj"
      $run $mv $obj $libobj || exit 1

      # Allow error messages only from the first compilation.
      suppress_output=' >/dev/null 2>&1'
    fi

    # Only build a position-dependent object if we build old libraries.
    if test "$build_old_libs" = yes; then
      # Suppress compiler output if we already did a PIC compilation.
      $show "$base_compile $srcfile$suppress_output"
      if $run eval "$base_compile \$srcfile$suppress_output"; then :
      else
        $run $rm $obj $libobj
        exit 1
      fi
    fi

    # Create an invalid libtool object if no PIC, so that we do not
    # accidentally link it into a program.
    if test "$build_libtool_libs" != yes; then
      $show "echo timestamp > $libobj"
      $run eval "echo timestamp > \$libobj" || exit $?
    fi

    exit 0
    ;;

  # libtool link mode
  link)
    modename="$modename: link"
    CC="$nonopt"
    allow_undefined=yes
    compile_command="$CC"
    finalize_command="$CC"

    compile_shlibpath=
    finalize_shlibpath=
    deplibs=
    dlfiles=
    dlprefiles=
    export_dynamic=no
    hardcode_libdirs=
    libobjs=
    link_against_libtool_libs=
    ltlibs=
    objs=
    prev=
    prevarg=
    release=
    rpath=
    perm_rpath=
    temp_rpath=
    vinfo=

    # We need to know -static, to get the right output filenames.
    for arg
    do
      case "$arg" in
      -all-static | -static)
        if test "X$arg" = "X-all-static" && test "$build_libtool_libs" = yes && test -z "$link_static_flag"; then
	    $echo "$modename: warning: complete static linking is impossible in this configuration" 1>&2
        fi
        build_libtool_libs=no
	build_old_libs=yes
        break
        ;;
      esac
    done

    # See if our shared archives depend on static archives.
    test -n "$old_archive_from_new_cmds" && build_old_libs=yes

    # Go through the arguments, transforming them on the way.
    for arg
    do
      # If the previous option needs an argument, assign it.
      if test -n "$prev"; then
        case "$prev" in
        output)
          compile_command="$compile_command @OUTPUT@"
          finalize_command="$finalize_command @OUTPUT@"
          ;;
        esac

        case "$prev" in
        dlfiles|dlprefiles)
          case "$arg" in
          *.la | *.lo) ;;  # We handle these cases below.
          *)
            dlprefiles="$dlprefiles $arg"
            test "$prev" = dlfiles && dlfiles="$dlfiles $arg"
            prev=
            ;;
          esac
          ;;
	release)
	  release="-$arg"
	  prev=
	  continue
	  ;;
        rpath)
          rpath="$rpath $arg"
	  prev=