#! /bin/sh
# Usage: configure [options] [dirname [cc]]
# Examples:
#   configure obj
#   CC=gcc configure make.gcc
#   CC=cc configure make.cc
#   configure make.gcc gcc     (deprecated)
#   configure make.cc cc       (deprecated)

# we source config.cache, therefore this file must be executed by the
# same shell as executes sub-configures.
# this is a real problem on such systems as Solaris if CONFIG_SHELL is
# bash whose config.cache cannot be loaded by /bin/sh
if test -n "${CONFIG_SHELL}"; then
  # ensure that CONFIG_SHELL is compatible with /bin/sh:
  # if CONFIG_SHELL is bash, but /bin/sh is not, restart with bash
  if test -n "`${CONFIG_SHELL} --version 2>/dev/null | grep bash 2>/dev/null`"
  then # CONFIG_SHELL is bash
    test -n "${BASH_VERSION}" || exec ${CONFIG_SHELL} $0 $*
  fi
else CONFIG_SHELL=/bin/sh
fi

fail () { echo "$*" >&2; exit 1; }

info_help () {
cat << \EOP
Usage: configure [options] [dirname]
dirname: Name of directory in which to build CLISP. This allows you to build
         CLISP with different compilers on the same machine or for different
         architectures in the same filesystem, sharing the same source.
         Default is "src".
options: The following options are recognized:
  --help                print this message and exit
  --version             print the CLISP version and exit
  --config              unix/INSTALL step 3: configuration only
  --cbc                 unix/INSTALL steps 3-8: Configure, Build, Check
 The following options set installation parameters:
  --srcdir=SRCDIR       sets the source directory to SRCDIR
 The following options are passed to subordinate `configure' scripts:
  --quiet, --silent     do not print `checking...' messages
 Installation directories:
  --prefix=PREFIX       base directory for files to be installed
  --exec-prefix=PREFIX  base directory for architecture-dependent
                        files to be installed
  --fsstnd=STYLE        specify file system standard for installation
 Fine tuning of the installation directories:
  --bindir=DIR          user executables
  --libdir=DIR          object code libraries
  --includedir=DIR      C header files
  --datarootdir=DIR     read-only arch.-independent data root
  --datadir=DIR         read-only architecture-independent data
  --localedir=DIR       locale-dependent data
  --mandir=DIR          man documentation
  --infodir=DIR         info documentation
  --docdir=DIR          documentation root
  --htmldir=DIR         html documentation
  --dvidir=DIR          TeX DVI documentation
  --pdfdir=DIR          PDF documentation
  --psdir=DIR           PostScript documentation
  --elispdir=DIR        Emacs Lisp files
  --vimdir=DIR          VIM files
  --aclocaldir=DIR      autoconf files
 Enable and disable specific packages
  --with-PACKAGE        use PACKAGE
  --without-PACKAGE     do not use PACKAGE
    PACKAGEs available (the default is the opposite of the following):
   --without-ffcall     do not support Foreign Function Interface
                        the default is to support it when available
   --without-dynamic-modules  no Dynamic Modules support
   --without-unicode       no Unicode support: character=8bit
   --without-readline      do not link with GNU readline
   --with-threads=FLAVOR   support multiple threads in one CLISP image
                  via OS threads [highly experimental - use at your own risk]
                  FLAVOR: POSIX_THREADS SOLARIS_THREADS WIN32_THREADS
  --with-jitc=FLAVOR   use a given Just-In-Time Compiler.
             The only flavor at this time is lightning
               (GNU lightning must be installed in the standard place).
  --with-module=MODULE  build with add-on MODULE
  --help-modules        list the modules included in the distribution
                        and information on building them
  --hyperspec=URL       the path to the Common Lisp HyperSpec (the default is
         http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/
         or the value of the environment variable CLHSROOT, if set)
  --with-debug          pass "debug" to makemake (CFLAGS+=g &c)
  --with-gmalloc        use the GNU malloc instead of of the libc one
                        (needed on HP-UX and OpenBSD)
  --edit-config         edit config.lisp with ${EDITOR:-vi} before make
                        (useful with --cbc)
System types:
  --build=BUILD     configure for building on BUILD [guessed]
  --host=HOST       cross-compile to build programs to run on HOST [BUILD]

 You can specify the location of dependencies using
EOP

`dirname $0`/src/configure --help | grep 'with.*prefix'

cat << \EOP
 See also the --help-modules option.

Example:
  configure --cbc built-with-gcc
  su bin
  cd built-with-gcc
  make install
  exit
Specifying the C compiler:
  If you wish to specify the C compiler that will get used to build
  CLISP, set the environment variables CC, CFLAGS, LIBS.
  Put compiler flags that have to be passed to the preprocessor
  into the CC variable, not the CFLAGS variable.
  For example, if you want to use gcc in ANSI C mode,
  execute the following before calling `configure':
        setenv CC "gcc -ansi"                 if using csh
        export CC="gcc -ansi"                 if using bash or ksh
        CC="gcc -ansi"; export CC             if using sh
If you have headers in a nonstandard directory <include dir>
  set CPPFLAGS to "-I<include dir>"
If you have libraries in a nonstandard directory <lib dir>
  set LDFLAGS to "-L<lib dir>"
Using GNU libiconv (only needed if you do not have GNU LIBC 2.2 or better):
  If you want to use GNU libiconv which is not installed system-wide,
  you may supply a --with-libiconv-prefix argument
  (type './src/configure --help' for details).
  The same goes for non-standard locations of libintl and libsigsegv.
EOP
}

# Abort in case something fails.
set -e

# Nuisances.
(unset CDPATH) >/dev/null 2>&1 && unset CDPATH

srcdir=''
# http://www.gnu.org/software/autoconf/manual/html_node/Option-Checking.html
subdir_configure_args='--disable-option-checking'
makemake_args=''
do_config=''
do_cbc=''
argcount=0
edit_config=''

prev=''
passnext=''
debug=''
do_ffi='default'
target=''
ignore_absence_of_libsigsegv=''

prefix="/usr/local"
exec_prefix=${prefix}

getarg(){ echo "$1" | sed 's,^[-_a-zA-Z0-9]*=,,'; }

all_modules=''
note_module(){
  all_modules=${all_modules}" $1"
  makemake_args=${makemake_args}" --with-module=$1"
}

for arg # in "$@"
do
  # If the previous option needs an argument, assign it.
  if test -n "$prev"; then
    # If the previous option needs an argument for subdir configures or
    # makemake, pass it, otherwise set the variable
    case "$passnext" in
      configure) subdir_configure_args="$subdir_configure_args $arg" ;;
      makemake) makemake_args="$makemake_args$arg" ;;
      both) makemake_args="$makemake_args$arg"
        subdir_configure_args="$subdir_configure_args $arg" ;;
      with-module) note_module $arg ;;
      *) eval "$prev=\$arg" ;;
    esac
    passnext=''
    prev=''
  else

    case "$arg" in

      --cbc | --cb)
        do_config=1
        do_cbc=1 ;;

      --config | --confi | --conf | --con | --co)
        do_config=1 ;;

      --edit-config | --edit-confi | --edit-conf | --edit-con | --edit-co | \
      --edit-c | --edit- | --edit | --edi | --ed)
        edit_config=1 ;;

      --help | --hel | --he)
        info_help
        exit 0 ;;

      --version | --versio | --versi | --vers | --ver | --ve | --v)
        ./src/configure --version
        exit 0 ;;

      --help-modules | --help-module | --help-modul | --help-modu | --help-mod | --help-mo | --help-m)
        set +e
        MODDIR=modules
        echo "module sets found in the directory '${MODDIR}':"
        MODLIST=`find ${MODDIR} -name link.sh -o -name link.sh.in | sed -e 's,^${MODDIR}/,,' -e 's,/[^/]*$,,' | sort`
        for m in ${MODLIST}; do echo " "${m}; done
        echo "to specify the location of external software:"
        for m in src ${MODLIST}; do
          CFG=./${m}/configure
          if [ -x ${CFG} ]; then
            tmp=${CFG}.with
            ${CFG} --help | grep '  --with-[a-zA-Z0-8]*-prefix' > ${tmp}
            if test -s ${tmp}; then
              echo "* ${m} (try also '${CFG} --help')"
              cat ${tmp}
            fi
            rm -f ${tmp}
          fi
        done
        exit 0 ;;

      --srcdir=* | --srcdi=* | --srcd=* | --src=* | --sr=*)
        srcdir=`getarg "$arg"` ;;

      --srcdir | --srcdi | --srcd | --src | --sr)
        prev=srcdir
        passnext=configure ;;

      --prefix=* | --prefi=* | --pref=* | --pre=* | --pr=*)
        subdir_configure_args="$subdir_configure_args $arg"
        prefix=`getarg "$arg"`
        makemake_args="$makemake_args --prefix=${prefix}" ;;

      --prefix | --prefi | --pref | --pre | --pr)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --prefix="
        prev=prefix
        passnext=both ;;

      --exec_prefix=* | --exec-prefix=* | --exec-prefi=* | --exec-pref=* | --exec-pre=* | --exec-pr=* | --exec-p=* | --exec-=* | -exec=* | --exe=* | --ex=*)
        subdir_configure_args="$subdir_configure_args $arg"
        exec_prefix=`getarg "$arg"`
        makemake_args="$makemake_args --exec-prefix="${exec_prefix} ;;

      --exec_prefix | --exec-prefix | --exec-prefi | --exec-pref | --exec-pre | --exec-pr | --exec-p | --exec- | -exec | --exe | --ex)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --exec-prefix="
        prev=exec_prefix
        passnext=both ;;

      --fsstnd=* | --fsstn=* | --fsst=* | --fss=* | --fs=* | --f=*)
        makemake_args="$makemake_args --fsstnd="`getarg "$arg"` ;;

      --bindir=* | --bindi=* | --bind=* | --bin=* | --bi=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --bindir="`getarg "$arg"` ;;

      --bindir | --bindi | --bind | --bin | --bi)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --bindir="
        prev=bindir
        passnext=both ;;

      --libdir=* | --libdi=* | --libd=* | --lib=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --libdir="`getarg "$arg"` ;;

      --libdir | --libdi | --libd | --lib)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --libdir="
        prev=libdir
        passnext=both ;;

      --includedir=* | --includedi=* | --included=* | --include=* | --includ=* | --inclu=* | --incl=* | --inc=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --includedir="`getarg "$arg"` ;;

      --includedir | --includedi | --included | --include | --includ | --inclu | --incl | --inc)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --includedir="
        prev=includedir
        passnext=both ;;

      --datarootdir=* | --datarootdi=* | --datarootd=* | --dataroot=* | --dataroo=* | --dataro=* | --datar=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --datarootdir="`getarg "$arg"` ;;

      --datarootdir | --datarootdi | --datarootd | --dataroot | --dataroo | --dataro | --datar)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --datarootdir="
        prev=datarootdir
        passnext=both ;;

      --datadir=* | --datadi=* | --datad=* | --data=* | --dat=* | --da=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --datadir="`getarg "$arg"` ;;

      --datadir | --datadi | --datad | --data | --dat | --da)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --datadir="
        prev=datadir
        passnext=both ;;

      --localedir=* | --localedi=* | --localed=* | --locale=* | --local=* | --loca=* | --loc=* | --lo=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --localedir="`getarg "$arg"` ;;

      --localedir | --localedi | --localed | --locale | --local | --loca | --loc | --lo)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --localedir="
        prev=localedir
        passnext=both ;;

      --docdir=* | --docdi=* | --docd=* | --doc=* | --do=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --docdir="`getarg "$arg"` ;;

      --docdir | --docdi | --docd | --doc | --do)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --docdir="
        prev=docdir
        passnext=both ;;

      --mandir=* | --mandi=* | --mand=* | --man=* | --ma=* | --m=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --mandir="`getarg "$arg"` ;;

      --mandir | --mandi | --mand | --man | --ma | --m)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --mandir="
        prev=mandir
        passnext=both ;;

      --infodir=* | --infodi=* | --infod=* | --info=* | --inf=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --infodir="`getarg "$arg"` ;;

      --infodir | --infodi | --infod | --info | --inf)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --infodir="
        prev=infodir
        passnext=both ;;

      --htmldir=* | --htmldi=* | --htmld=* | --html=* | --htm=* | --ht=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --htmldir="`getarg "$arg"` ;;

      --htmldir | --htmldi | --htmld | --html | --htm | --ht)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --htmldir="
        prev=htmldir
        passnext=both ;;

      --dvidir=* | --dvidi=* | --dvid=* | --dvi=* | --dv=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --dvidir="`getarg "$arg"` ;;

      --dvidir | --dvidi | --dvid | --dvi | --dv)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --dvidir="
        prev=dvidir
        passnext=both ;;

      --psdir=* | --psdi=* | --psd=* | --ps=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --psdir="`getarg "$arg"` ;;

      --psdir | --psdi | --psd | --ps)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --psdir="
        prev=psdir
        passnext=both ;;

      --pdfdir=* | --pdfdi=* | --pdfd=* | --pdf=* | --pd=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --pdfdir="`getarg "$arg"` ;;

      --pdfdir | --pdfdi | --pdfd | --pdf | --pd)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --pdfdir="
        prev=pdfdir
        passnext=both ;;

      --elispdir=* | --elispdi=* | --elispd=* | --elisp=* | --elis=* | --eli=* | --el=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --elispdir="`getarg "$arg"` ;;

      --elispdir | --elispdi | --elispd | --elisp | --elis | --eli | --el)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --elispdir="
        prev=elispdir
        passnext=both ;;

      --vimdir=* | --vimdi=* | --vimd=* | --vim=* | --vi=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --vimdir="`getarg "$arg"` ;;

      --vimdir | --vimdi | --vimd | --vim | --vi)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --vimdir="
        prev=vimdir
        passnext=both ;;

      --aclocaldir=* | --aclocaldi=* | --aclocald=* | --aclocal=*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --aclocaldir="`getarg "$arg"` ;;

      --aclocaldir | --aclocaldi | --aclocald | --aclocal)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args --aclocaldir="
        prev=aclocaldir
        passnext=both ;;

      --hyperspec=* | --hyperspe=* | --hypersp=* | --hypers=* | --hs=* | --hy=*)
        makemake_args="$makemake_args --hyperspec="`getarg "$arg"` ;;

      --quiet | --quie | --qui | --qu | --q | \
      --silent | --silen | --sile | --sil | --si)
        subdir_configure_args="$subdir_configure_args $arg" ;;

      --host=* | --hos=* | --ho=*)
        target=cross
        subdir_configure_args="$subdir_configure_args $arg" ;;

      --host | --hos | --ho)
        target=cross
        subdir_configure_args="$subdir_configure_args $arg"
        prev=host
        passnext=configure ;;

      --build=* | --buil=* | --bui=* | --bu=*)
        target=cross
        subdir_configure_args="$subdir_configure_args $arg" ;;

      --build | --buil | --bui | --bu)
        target=cross
        subdir_configure_args="$subdir_configure_args $arg"
        prev=host
        passnext=configure ;;

      --with-debug)
        makemake_args="--verbose=yes $makemake_args"
        debug="debug" ;;

      --without-ffcall | --with-ffcall=no | --with-no-ffcall)
        subdir_configure_args="$subdir_configure_args $arg"
        do_ffi="no" ;;

      --with-ffcall | --with-ffcall=yes)
        subdir_configure_args="$subdir_configure_args $arg"
        do_ffi="yes" ;;

      --without-dynamic-modules | --with-dynamic-modules=no)
        makemake_args="--with-dynamic-modules=no ${makemake_args}" ;;

      --with-mingw | --with-no-cygwin | --without-cygwin | --with-cygwin=no)
        CC="${CC:-gcc} -mno-cygwin"; export CC;
        makemake_args="$makemake_args --win32gcc" ;;

      --with-module=*) note_module `getarg $arg` ;;

      --with-module)
        prev=with-module
        passnext=with-module ;;

      --with-* | --without-*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args $arg" ;;

      --enable-* | --disable-*)
        subdir_configure_args="$subdir_configure_args $arg"
        makemake_args="$makemake_args $arg" ;;

      --ignore-absence-of-libsigsegv)
        ignore_absence_of_libsigsegv=yes ;;

      -*)
        fail "$0: invalid argument $arg
$0: Try \`$0 --help'" ;;

      *=*) # set a variable
        var=`echo $arg | sed 's/\([^=]*\)=.*/\1/'`
        val=`echo $arg | sed 's/[^=]*=\(.*\)/\1/'`
        eval "$var='$val'"
        export $var ;;

      *) # Everything else counts as a positional argument
        argcount=`expr $argcount + 1`
        eval "POSARG$argcount=\$arg" ;;

    esac

  fi
done
test -n "$prev" && fail "$0: missing argument to $prev
$0: Try \`$0 --help'"

DIRNAME=$POSARG1
COMPILER=$POSARG2 # deprecated

if test -z "$do_config" -a -z "$do_cbc"; then
  # Default is --config
  do_config=1
fi

# checking how to copy files
echo "blabla" > conftest.x
err=`/bin/sh -c "cp -p conftest.x conftest.y 2>&1 ; exit 0"`
if test -z "$err"; then
  CP='cp -p'
else
  CP='cp'
fi
rm -f conftest*

# get the absolute pathname from a possibly relative one
abs_pwd () { cd "$1" > /dev/null; pwd; }

# link FILE1 FILE2  is like `ln', but chooses the cheapest alternative:
# hard link if FILE1 and FILE2 on the same disk, else symbolic link if the
# system supports that, else file copy.
link () {
rm -f "$2";
# Note: With some versions of "ln" this does not work if FILE2 is a symlink.
if ln "$1" "$2" 2>/dev/null; then
  :
else
  srcfile_dirname=`echo "$1" | sed -e 's,/[^/]*$,,'`
  test -n "$srcfile_dirname" || srcfile_dirname='/'
  srcfile_basename=`echo "$1" | sed -e 's,^.*/,,'`
  srcfile_absdirname=`abs_pwd "$srcfile_dirname"`
  if ln -s "$srcfile_absdirname/$srcfile_basename" "$2" 2>/dev/null; then
    :
  else
    $CP "$1" "$2"
  fi
fi
}
maybe_link () { if [ -f "$1" ]; then link "$1" "$2"; fi; }

# Note that we would need to call `/bin/pwd` if we wanted to compare two
# directories for equality. But here we only need to get _some_ absolute
# pathnames, hence `pwd` is enough.

if test -f /bin/pwd ; then
  ABSPATHPWD=/bin/pwd
else
  ABSPATHPWD=pwd
fi

abs_path_pwd () { cd "$1" > /dev/null; ${ABSPATHPWD}; }

INPLACE=''
if test -n "$srcdir" ; then
  test -d "$srcdir" || fail "$0: srcdir: ($srcdir) nonexistent"
  ABS_SRCDIR=`abs_pwd "$srcdir"`;
  if [ "$DIRNAME" = "" ] ; then
    DIRNAME='.'
  fi
  mkdir -p "${DIRNAME}";
  REL_SRCDIR="$ABS_SRCDIR"
else
  if test -f ./ANNOUNCE -a -f ./SUMMARY; then
    srcdir='.'
    ABS_SRCDIR=`abs_pwd "$srcdir"`
    if [ "$DIRNAME" = "" ] ; then
      DIRNAME=src
    fi
  else
    test -f ../ANNOUNCE -a -f ../SUMMARY || \
      fail "$0: source directory not found, use --srcdir option"
    srcdir='..'
    ABS_SRCDIR=`abs_pwd "$srcdir"`
    if [ "$DIRNAME" = "" ] ; then
      DIRNAME='.'
    fi
  fi
  mkdir -p "${DIRNAME}";
  if test `abs_path_pwd "$DIRNAME"/..` = `abs_path_pwd "$srcdir"` ; then
    REL_SRCDIR='..'
  else
    REL_SRCDIR="$ABS_SRCDIR"
  fi
fi
ABS_DIRNAME="`abs_pwd "$DIRNAME"`";
if test "`abs_path_pwd "$DIRNAME"`" = "`abs_path_pwd "$srcdir"/src`" ; then
  INPLACE=yes
fi
case "$REL_SRCDIR" in
  /*) RREL_SRCDIR="$REL_SRCDIR";;
  *)  RREL_SRCDIR="../$REL_SRCDIR";;
esac

# srcdir        top level source directory
#               (i.e. this script is $srcdir/configure)
# ABS_SRCDIR    absolute srcdir
# REL_SRCDIR    srcdir, relative to $DIRNAME
# RREL_SRCDIR   srcdir, relative to $DIRNAME/anysubdir
# DIRNAME       directory in which to build
# ABS_DIRNAME   absolute DIRNAME
# INPLACE       set if DIRNAME is the source directory, hence no links needed

if test -n "$do_config"; then

  cd "$ABS_SRCDIR"

  if [ "$COMPILER" != "" ] ; then
    CC="$COMPILER"
    export CC
  fi
  if test -z "$INPLACE"; then
    # Create the po subdirectory and fill it
    for f in po; do
      if [ -d src/$f ] ; then
        mkdir -p "${ABS_DIRNAME}/${f}";
        ( cd src
          for g in $f/* ; do maybe_link $g "$ABS_DIRNAME/$g"; done; )
      fi
    done
    for f in configure config.h.in makemake.in version.h ; do
      maybe_link src/$f "$ABS_DIRNAME/$f";
    done
  fi
  # no need to create subdirectories for the modules - makemake handles that
  # Prepare the configure files.
  chmod a+x "$ABS_DIRNAME/configure"
  # Start the configurations.
  if test -n "$INPLACE"; then
    subdir_srcdir_args=''
  else
    subdir_srcdir_args="--srcdir=$REL_SRCDIR/src"
  fi
  cd "${ABS_DIRNAME}";
  echo "executing `pwd`/configure $*"
  ${CONFIG_SHELL} configure $subdir_srcdir_args \
    $subdir_configure_args --cache-file=config.cache
fi

makemake_args="${makemake_args} ${subdir_srcdir_args}";

. "${ABS_DIRNAME}/config.cache"

test -n "${target}" && target="${target} ${ac_cv_host} ${ac_cv_prog_CC}"
makemake_args="${makemake_args} ${target} ${debug}";

test -n "${cl_cv_have_ffcall}" || cl_cv_have_ffcall=notchecked
cat <<EOF
Configure findings:
  FFI:        ${cl_cv_have_ffcall} (user requested: ${do_ffi})
  readline:   ${ac_cv_have_readline} (user requested: ${ac_cv_use_readline})
  libsigsegv: ${gl_cv_lib_sigsegv}
EOF

# are any FFI modules requested?
ffi_modules=''
for module in ${all_modules}; do
  mdir=${ABS_SRCDIR}/modules/${module}
  test -d ${mdir} || fail "$0: ${mdir} is not an exisiting directory"
  if test -r ${mdir}/configure.in; then
    grep 'CL_MODULE_COMMON_CHECKS.*ffi' ${mdir}/configure.in > /dev/null 2>&1 && \
      ffi_modules=${ffi_modules}" ${module}"
  elif grep '.*\.c.*\.fas.*:\|.*\.fas.*\.c.*:' ${mdir}/Makefile > /dev/null 2>&1 ; then
    ffi_modules=${ffi_modules}" ${module}"
  elif grep ':use.*"FFI"' ${mdir}/*.lisp > /dev/null 2>&1; then
    ffi_modules=${ffi_modules}" ${module}"
  fi
done
if test -n "${ffi_modules}"; then
  test ${do_ffi} = no && \
    fail "$0: --without-ffcall is incompatible with requested module(s):${ffi_modules}"
  test ${cl_cv_have_ffcall} = no && \
    fail "$0: modules${ffi_modules} require FFI"
fi
if [ ${do_ffi} != no -a ${cl_cv_have_ffcall} = yes ]; then
  makemake_args="--with-dynamic-ffi ${makemake_args}"
fi

if [ "${gl_cv_lib_sigsegv}" != "yes" ]; then
  if [ "${ignore_absence_of_libsigsegv}" = "yes" ]; then
    echo "As you requested, we will proceed without libsigsegv..."
  else
    if [ "$ac_cv_build" = "$ac_cv_host" ]; then host_arg="";
    else host_arg=" --host=$ac_cv_host";
    fi
    SIGSEGV=libsigsegv-2.8
    cat <<EOF 1>&2
$0: libsigsegv was not detected, thus some features, such as
  generational garbage collection and
  stack overflow detection in interpreted Lisp code
cannot be provided.
Please install libsigsegv like this:
EOF
    if [ "${CC+set}" = "set" ]; then
      echo "  CC='$CC'; export CC" 1>&2
    fi
    cat <<EOF 1>&2
  mkdir tools; cd tools; prefix=\`pwd\`/${ac_cv_host}
  wget http://ftp.gnu.org/pub/gnu/libsigsegv/${SIGSEGV}.tar.gz
  tar xfz ${SIGSEGV}.tar.gz
  cd ${SIGSEGV}
  ./configure${host_arg} --prefix=\${prefix} && make && make check && make install
  cd ../..
  rm -f ${DIRNAME}/config.cache
  ./configure --with-libsigsegv-prefix=\${prefix} $*
If you insist on building without libsigsegv, please pass
  --ignore-absence-of-libsigsegv
to this script:
  ./configure --ignore-absence-of-libsigsegv $*
If you have installed libsigsegv, but clisp does not detect it,
you might have installed it incorrectly, see section 2 in in unix/INSTALL.
EOF
    exit 1;
  fi
fi

# CLISP needs a lot of stack space for bootstrapping,
# and insufficient stack space manifests itself via arbitrary GC errors.
# it was believed that 8192 is enough until power5 came along:
# https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=166347
STACK_LIMIT=16384
stacksizelimit=`ulimit -s 2>/dev/null || :` # cygwin /bin/sh ulimit is broken
# need 3 separate test calls because of "integer expression expected" errors
# when $stacksizelimit is "" or "unlimited" (no short-circuiting!)
set +e;
test -z "$stacksizelimit" || { test "$stacksizelimit" != unlimited && test "$stacksizelimit" -lt ${STACK_LIMIT}; }
STACK_TOO_SMALL=$?      # 0=true => need to reset; 1=false => big enough
set -e

cd "$ABS_DIRNAME"
echo "./makemake $makemake_args > Makefile"
./makemake $makemake_args > Makefile
make config.lisp

if test -z "$do_cbc"; then
  echo
  echo "To continue building CLISP, the following commands are recommended"
  echo "  (cf. unix/INSTALL step 4 ff):"
  if test "$DIRNAME" != "."; then
    echo "    cd $DIRNAME"
  fi
  echo "    ${EDITOR:-vi} config.lisp"
  if [ "${STACK_TOO_SMALL}" = 0 ]; then
    cat <<EOF
# The default stack size on your platform is insufficient
# and must be increased to at least ${STACK_LIMIT}.  You must do either
# 'ulimit -s ${STACK_LIMIT}' (for Bourne shell derivatives, e.g., bash and zsh)
# or 'limit stacksize ${STACK_LIMIT}' (for C shell derivarives, e.g., tcsh)
EOF
  fi
  echo "    make"
  echo "    make check"
else
  if [ -n "${edit_config}" ]; then
    make config.lisp;
    ${EDITOR:-vi} config.lisp;
  fi
  if [ "${STACK_TOO_SMALL}" = 0 ]; then
    set +e; ulimit -s ${STACK_LIMIT} 2>/dev/null; set -e;
  fi
  make
  make check
fi