Improve forward-compatibility with GNU M4.

[bison.git] / bootstrap

#! /bin/sh

# Bootstrap this package from checked-out sources.

# Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation,
# Inc.

# 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 3 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, see <http://www.gnu.org/licenses/>.

# Written by Paul Eggert.

nl='
'

# Ensure file names are sorted consistently across platforms.
# Also, ensure diagnostics are in English, e.g., "wget --help" below.
LC_ALL=C
export LC_ALL

local_gl_dir=gl

# Temporary directory names.
bt='._bootmp'
bt_regex=`echo "$bt"| sed 's/\./[.]/g'`
bt2=${bt}2

usage() {
  echo >&2 "\
Usage: $0 [OPTION]...
Bootstrap this package from the checked-out sources.

Options:
 --gnulib-srcdir=DIRNAME  Specify the local directory where gnulib
			  sources reside.  Use this if you already
			  have gnulib sources on your machine, and
			  do not want to waste your bandwidth downloading
			  them again.
 --copy                   Copy files instead of creating symbolic links.
 --force                  Attempt to bootstrap even if the sources seem
			  not to have been checked out.
 --skip-po                Do not download po files.
 --cvs-user=USERNAME      Set the username to use when checking out
			  sources from the gnulib repository.

If the file bootstrap.conf exists in the current working directory, its
contents are read as shell variables to configure the bootstrap.

Running without arguments will suffice in most cases.
"
}

# Configuration.

# Name of the Makefile.am
gnulib_mk=gnulib.mk

# List of gnulib modules needed.
gnulib_modules=

# Any gnulib files needed that are not in modules.
gnulib_files=

# The command to download all .po files for a specified domain into
# a specified directory.  Fill in the first %s is the domain name, and
# the second with the destination directory.  Use rsync's -L and -r
# options because the latest/%s directory and the .po files within are
# all symlinks.
po_download_command_format=\
"rsync -Lrtvz 'translationproject.org::tp/latest/%s/' '%s'"

extract_package_name='
  /^AC_INIT(/{
     /.*,.*,.*,/{
       s///
       s/[][]//g
       p
       q
     }
     s/AC_INIT(\[*//
     s/]*,.*//
     s/^GNU //
     y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/
     s/[^A-Za-z0-9_]/-/g
     p
  }
'
package=`sed -n "$extract_package_name" configure.ac` || exit
gnulib_name=lib$package

build_aux=build-aux
# Extra files from gnulib, which override files from other sources.
gnulib_extra_files="
	$build_aux/install-sh
	$build_aux/missing
	$build_aux/mdate-sh
	$build_aux/texinfo.tex
	$build_aux/depcomp
	$build_aux/config.guess
	$build_aux/config.sub
	doc/INSTALL
"

# Additional gnulib-tool options to use.  Use "\newline" to break lines.
gnulib_tool_option_extras=

# Other locale categories that need message catalogs.
EXTRA_LOCALE_CATEGORIES=

# Additional xgettext options to use.  Use "\\\newline" to break lines.
XGETTEXT_OPTIONS='\\\
 --flag=_:1:pass-c-format\\\
 --flag=N_:1:pass-c-format\\\
 --flag=error:3:c-format --flag=error_at_line:5:c-format\\\
'

# Files we don't want to import.
excluded_files=

# File that should exist in the top directory of a checked out hierarchy,
# but not in a distribution tarball.
checkout_only_file=README-hacking

# Whether to use copies instead of symlinks.
copy=false

# Set this to '.cvsignore .gitignore' in bootstrap.conf if you want
# those files to be generated in directories like lib/, m4/, and po/.
# Or set it to 'auto' to make this script select which to use based
# on which version control system (if any) is used in the source directory.
vc_ignore=auto

# find_tool ENVVAR NAMES...
# -------------------------
find_tool ()
{
  # Find sha1sum, named gsha1sum on MacPorts.
  find_tool_envvar=$1
  shift
  if eval test x"\$$find_tool_envvar" = x; then
    for i
    do
      if ($i --version </dev/null) >/dev/null 2>&1; then
	find_tool_res=$i
	break
      fi
    done
  fi
  if test x"$find_tool_res" = x; then
    echo >&2 "$0: $find_tool_name is required"
    exit 1
  fi
  ($find_tool_res --version </dev/null) >/dev/null 2>&1 || {
    echo >&2 "$0: cannot run $find_tool_res --version"
    exit 1
  }
  eval "$find_tool_envvar=\"$find_tool_res\""
  eval "export $find_tool_envvar"
}

# Find sha1sum, named gsha1sum on MacPorts.
find_tool SHA1SUM sha1sum gsha1sum

# Override the default configuration, if necessary.
test -r bootstrap.conf && . ./bootstrap.conf

if test "$vc_ignore" = auto; then
  vc_ignore=
  test -d .git && vc_ignore=.gitignore
  test -d CVS && vc_ignore="$vc_ignore .cvsignore"
fi

# Translate configuration into internal form.

# Parse options.

for option
do
  case $option in
  --help)
    usage
    exit;;
  --gnulib-srcdir=*)
    GNULIB_SRCDIR=`expr "$option" : '--gnulib-srcdir=\(.*\)'`;;
  --cvs-user=*)
    CVS_USER=`expr "$option" : '--cvs-user=\(.*\)'`;;
  --skip-po)
    SKIP_PO=t;;
  --force)
    checkout_only_file=;;
  --copy)
    copy=true;;
  *)
    echo >&2 "$0: $option: unknown option"
    exit 1;;
  esac
done

if test -n "$checkout_only_file" && test ! -r "$checkout_only_file"; then
  echo "$0: Bootstrapping from a non-checked-out distribution is risky." >&2
  exit 1
fi

# If $STR is not already on a line by itself in $FILE, insert it,
# sorting the new contents of the file and replacing $FILE with the result.
insert_sorted_if_absent() {
  file=$1
  str=$2
  test -f $file || touch $file
  echo "$str" | sort -u - $file | cmp -s - $file \
    || echo "$str" | sort -u - $file -o $file \
    || exit 1
}

# Die if there is no AC_CONFIG_AUX_DIR($build_aux) line in configure.ac.
found_aux_dir=no
grep '^[	 ]*AC_CONFIG_AUX_DIR(\['"$build_aux"'\])' configure.ac \
    >/dev/null && found_aux_dir=yes
grep '^[	 ]*AC_CONFIG_AUX_DIR('"$build_aux"')' configure.ac \
    >/dev/null && found_aux_dir=yes
if test $found_aux_dir = no; then
  echo "$0: expected line not found in configure.ac. Add the following:" >&2
  echo "  AC_CONFIG_AUX_DIR([$build_aux])" >&2
  exit 1
fi

# If $build_aux doesn't exist, create it now, otherwise some bits
# below will malfunction.  If creating it, also mark it as ignored.
if test ! -d $build_aux; then
  mkdir $build_aux
  for dot_ig in x $vc_ignore; do
    test $dot_ig = x && continue
    insert_sorted_if_absent $dot_ig $build_aux
  done
fi

echo "$0: Bootstrapping from checked-out $package sources..."

cleanup_gnulib() {
  status=$?
  rm -fr gnulib
  exit $status
}

# Get gnulib files.

case ${GNULIB_SRCDIR--} in
-)
  if [ ! -d gnulib ]; then
    echo "$0: getting gnulib files..."

    case ${CVS_AUTH-pserver} in
    pserver)
      CVS_PREFIX=':pserver:anonymous@';;
    ssh)
      CVS_PREFIX="$CVS_USER${CVS_USER+@}";;
    *)
      echo "$0: $CVS_AUTH: Unknown CVS access method" >&2
      exit 1;;
    esac

    case $CVS_RSH in
    '') CVS_RSH=ssh; export CVS_RSH;;
    esac

    trap cleanup_gnulib 1 2 13 15

    cvs -z3 -q -d ${CVS_PREFIX}pserver.git.sv.gnu.org:/gnulib.git co -d gnulib HEAD ||
      cleanup_gnulib

    trap - 1 2 13 15
  fi
  GNULIB_SRCDIR=gnulib
esac

gnulib_tool=$GNULIB_SRCDIR/gnulib-tool
<$gnulib_tool || exit

# Get translations.

download_po_files() {
  subdir=$1
  domain=$2
  echo "$0: getting translations into $subdir for $domain..."
  cmd=`printf "$po_download_command_format" "$domain" "$subdir"`
  eval "$cmd"
}

# Download .po files to $po_dir/.reference and copy only the new
# or modified ones into $po_dir.  Also update $po_dir/LINGUAS.
update_po_files() {
  # Directory containing primary .po files.
  # Overwrite them only when we're sure a .po file is new.
  po_dir=$1
  domain=$2

  # Download *.po files into this dir.
  # Usually contains *.s1 checksum files.
  ref_po_dir="$po_dir/.reference"

  test -d $ref_po_dir || mkdir $ref_po_dir || return
  download_po_files $ref_po_dir $domain \
    && ls "$ref_po_dir"/*.po 2>/dev/null |
      sed 's|.*/||; s|\.po$||' > "$po_dir/LINGUAS"

  for po in `cd $ref_po_dir && echo *.po|sed 's/\.po//g'`; do
     new_po="$ref_po_dir/$po.po"
     cksum_file="$ref_po_dir/$po.s1"
     if ! "$SHA1SUM" -c --status "$cksum_file" < "$new_po" > /dev/null; then
       echo "updated $po_dir/$po.po..."
       cp "$new_po" "$po_dir/$po.po" && "$SHA1SUM" < "$new_po" > "$cksum_file"
     fi
  done
}

case $SKIP_PO in
'')
  if test -d po; then
    update_po_files po $package || exit
  fi

  if test -d runtime-po; then
    update_po_files runtime-po $package-runtime || exit
  fi;;
esac

check_dst_dir()
{
  dst=$1
  # If the destination directory doesn't exist, create it.
  # This is required at least for "lib/uniwidth/cjk.h".
  dst_dir=`dirname "$dst"`
  if ! test -d "$dst_dir"; then
    mkdir -p "$dst_dir"

    # If we've just created a directory like lib/uniwidth,
    # tell version control system(s) it's ignorable.
    # FIXME: for now, this does only one level
    parent=`dirname "$dst_dir"`
    for dot_ig in x $vc_ignore; do
      test $dot_ig = x && continue
      ig=$parent/$dot_ig
      insert_sorted_if_absent $ig `echo "$dst_dir"|sed 's,.*/,,'`
    done
  fi
}

symlink_to_dir()
{
  src=$1/$2
  dst=${3-$2}

  test -f "$src" && {

    check_dst_dir "$dst"

    if $copy; then
      {
	test ! -h "$dst" || {
	  echo "$0: rm -f $dst" &&
	  rm -f "$dst"
	}
      } &&
      test -f "$dst" &&
      cmp -s "$src" "$dst" || {
	echo "$0: cp -fp $src $dst" &&
	cp -fp "$src" "$dst"
      }
    else
      test -h "$dst" &&
      src_ls=`ls -diL "$src" 2>/dev/null` && set $src_ls && src_i=$1 &&
      dst_ls=`ls -diL "$dst" 2>/dev/null` && set $dst_ls && dst_i=$1 &&
      test "$src_i" = "$dst_i" || {
	dot_dots=
	case $src in
	/*) ;;
	*)
	  case /$dst/ in
	  *//* | */../* | */./* | /*/*/*/*/*/)
	     echo >&2 "$0: invalid symlink calculation: $src -> $dst"
	     exit 1;;
	  /*/*/*/*/)	dot_dots=../../../;;
	  /*/*/*/)	dot_dots=../../;;
	  /*/*/)	dot_dots=../;;
	  esac;;
	esac

	echo "$0: ln -fs $dot_dots$src $dst" &&
	ln -fs "$dot_dots$src" "$dst"
      }
    fi
  }
}

cp_mark_as_generated()
{
  cp_src=$1
  cp_dst=$2

  if cmp -s "$cp_src" "$GNULIB_SRCDIR/$cp_dst"; then
    symlink_to_dir "$GNULIB_SRCDIR" "$cp_dst"
  elif cmp -s "$cp_src" "$local_gl_dir/$cp_dst"; then
    symlink_to_dir $local_gl_dir "$cp_dst"
  else
    case $cp_dst in
      *.[ch])             c1='/* '; c2=' */';;
      *.texi)             c1='@c '; c2=     ;;
      *.m4|*/Make*|Make*) c1='# ' ; c2=     ;;
      *)                  c1=     ; c2=     ;;
    esac

    if test -z "$c1"; then
      cmp -s "$cp_src" "$cp_dst" || {
	echo "$0: cp -f $cp_src $cp_dst" &&
	rm -f "$cp_dst" &&
	sed "s!$bt_regex/!!g" "$cp_src" > "$cp_dst"
      }
    else
      check_dst_dir "$cp_dst"
      # Copy the file first to get proper permissions if it
      # doesn't already exist.  Then overwrite the copy.
      cp "$cp_src" "$cp_dst-t" &&
      (
	echo "$c1-*- buffer-read-only: t -*- vi: set ro:$c2" &&
	echo "${c1}DO NOT EDIT! GENERATED AUTOMATICALLY!$c2" &&
	sed "s!$bt_regex/!!g" "$cp_src"
      ) > $cp_dst-t &&
      if cmp -s "$cp_dst-t" "$cp_dst"; then
	rm -f "$cp_dst-t"
      else
	echo "$0: cp $cp_src $cp_dst # with edits" &&
	mv -f "$cp_dst-t" "$cp_dst"
      fi
    fi
  fi
}

version_controlled_file() {
  dir=$1
  file=$2
  found=no
  if test -d CVS; then
    grep -F "/$file/" $dir/CVS/Entries 2>/dev/null |
	     grep '^/[^/]*/[0-9]' > /dev/null && found=yes
  elif test -d .git; then
    git-rm -n "$dir/$file" > /dev/null 2>&1 && found=yes
  else
    echo "$0: no version control for $dir/$file?" >&2
  fi
  test $found = yes
}

slurp() {
  for dir in . `(cd $1 && find * -type d -print)`; do
    copied=
    sep=
    for file in `ls -a $1/$dir`; do
      case $file in
      .|..) continue;;
      .*) continue;; # FIXME: should all file names starting with "." be ignored?
      esac
      test -d $1/$dir/$file && continue
      for excluded_file in $excluded_files; do
	test "$dir/$file" = "$excluded_file" && continue 2
      done
      if test $file = Makefile.am; then
	copied=$copied${sep}$gnulib_mk; sep=$nl
	remove_intl='/^[^#].*\/intl/s/^/#/;'"s!$bt_regex/!!g"
	sed "$remove_intl" $1/$dir/$file | cmp -s - $dir/$gnulib_mk || {
	  echo "$0: Copying $1/$dir/$file to $dir/$gnulib_mk ..." &&
	  rm -f $dir/$gnulib_mk &&
	  sed "$remove_intl" $1/$dir/$file >$dir/$gnulib_mk
	}
      elif { test "${2+set}" = set && test -r $2/$dir/$file; } ||
	   version_controlled_file $dir $file; then
	echo "$0: $dir/$file overrides $1/$dir/$file"
      else
	copied=$copied$sep$file; sep=$nl
	if test $file = gettext.m4; then
	  echo "$0: patching m4/gettext.m4 to remove need for intl/* ..."
	  rm -f $dir/$file
	  sed '
	    /^AC_DEFUN(\[AM_INTL_SUBDIR],/,/^]/c\
	      AC_DEFUN([AM_INTL_SUBDIR], [
	    /^AC_DEFUN(\[gt_INTL_SUBDIR_CORE],/,/^]/c\
	      AC_DEFUN([gt_INTL_SUBDIR_CORE], [])
	    $a\
	      AC_DEFUN([gl_LOCK_EARLY], [])
	  ' $1/$dir/$file >$dir/$file
	else
	  cp_mark_as_generated $1/$dir/$file $dir/$file
	fi
      fi || exit
    done

    for dot_ig in x $vc_ignore; do
      test $dot_ig = x && continue
      ig=$dir/$dot_ig
      if test -n "$copied"; then
	insert_sorted_if_absent $ig "$copied"
	# If an ignored file name ends with _.h, then also add
	# the name with just ".h".  Many gnulib headers are generated,
	# e.g., stdint_.h -> stdint.h, dirent_.h ->..., etc.
	# Likewise for .gperf -> .h, .y -> .c, and .sin -> .sed
	f=`echo "$copied"|sed 's/_\.h$/.h/;s/\.sin$/.sed/;s/\.y$/.c/;s/\.gperf$/.h/'`
	insert_sorted_if_absent $ig "$f"

	# For files like sys_stat_.h and sys_time_.h, record as
	# ignorable the directory we might eventually create: sys/.
	f=`echo "$copied"|sed 's/sys_.*_\.h$/sys/'`
	insert_sorted_if_absent $ig "$f"
      fi
    done
  done
}


# Create boot temporary directories to import from gnulib and gettext.
rm -fr $bt $bt2 &&
mkdir $bt $bt2 || exit

# Import from gnulib.

gnulib_tool_options="\
 --import\
 --no-changelog\
 --aux-dir $bt/$build_aux\
 --doc-base $bt/doc\
 --lib $gnulib_name\
 --m4-base $bt/m4/\
 --source-base $bt/lib/\
 --tests-base $bt/tests\
 --local-dir $local_gl_dir\
$gnulib_tool_option_extras\
"
echo "$0: $gnulib_tool $gnulib_tool_options --import ..."
$gnulib_tool $gnulib_tool_options --import $gnulib_modules &&
slurp $bt || exit

for file in $gnulib_files; do
  symlink_to_dir "$GNULIB_SRCDIR" $file || exit
done


# Import from gettext.
with_gettext=yes
grep '^[	 ]*AM_GNU_GETTEXT_VERSION(' configure.ac >/dev/null || \
    with_gettext=no

if test $with_gettext = yes; then
  echo "$0: (cd $bt2; autopoint) ..."
  cp configure.ac $bt2 &&
  (cd $bt2 && autopoint && rm configure.ac) &&
  slurp $bt2 $bt || exit

  rm -fr $bt $bt2 || exit
fi

# Coreutils is unusual in that it generates some of its test-related
# Makefile.am files.  That must be done before invoking automake.
mam_template=tests/Makefile.am.in
if test -f $mam_template; then
  PERL=perl
  for tool in cut head join pr sort tac tail test tr uniq wc; do
    m=tests/$tool/Makefile.am
    t=${m}t
    rm -f $m $t
    sed -n '1,/^##test-files-begin/p' $mam_template > $t
    echo "x = $tool" >> $t
    srcdir=tests/$tool
    $PERL -I$srcdir -w -- tests/mk-script $srcdir --list >> $t
    sed -n '/^##test-files-end/,$p' $mam_template >> $t
    chmod -w $t
    mv $t $m
  done
fi

# Reconfigure, getting other files.

for command in \
  libtool \
  'aclocal --force -I m4' \
  'autoconf --force' \
  'autoheader --force' \
  'automake --add-missing --copy --force-missing';
do
  if test "$command" = libtool; then
    grep '^[	 ]*AM_PROG_LIBTOOL\>' configure.ac >/dev/null ||
      continue
    command='libtoolize -c -f'
  fi
  echo "$0: $command ..."
  $command || exit
done


# Get some extra files from gnulib, overriding existing files.
for file in $gnulib_extra_files; do
  case $file in
  */INSTALL) dst=INSTALL;;
  build-aux/*) dst=$build_aux/`expr "$file" : 'build-aux/\(.*\)'`;;
  *) dst=$file;;
  esac
  symlink_to_dir "$GNULIB_SRCDIR" $file $dst || exit
done

if test $with_gettext = yes; then
  # Create gettext configuration.
  echo "$0: Creating po/Makevars from po/Makevars.template ..."
  rm -f po/Makevars
  sed '
    /^EXTRA_LOCALE_CATEGORIES *=/s/=.*/= '"$EXTRA_LOCALE_CATEGORIES"'/
    /^MSGID_BUGS_ADDRESS *=/s/=.*/= bug-'"$package"'@gnu.org/
    /^XGETTEXT_OPTIONS *=/{
      s/$/ \\/
      a\
	  '"$XGETTEXT_OPTIONS"' $${end_of_xgettext_options+}
    }
  ' po/Makevars.template >po/Makevars

  if test -d runtime-po; then
    # Similarly for runtime-po/Makevars, but not quite the same.
    rm -f runtime-po/Makevars
    sed '
      /^DOMAIN *=.*/s/=.*/= '"$package"'-runtime/
      /^subdir *=.*/s/=.*/= runtime-po/
      /^MSGID_BUGS_ADDRESS *=/s/=.*/= bug-'"$package"'@gnu.org/
      /^XGETTEXT_OPTIONS *=/{
	s/$/ \\/
	a\
	    '"$XGETTEXT_OPTIONS_RUNTIME"' $${end_of_xgettext_options+}
      }
    ' <po/Makevars.template >runtime-po/Makevars

    # Copy identical files from po to runtime-po.
    (cd po && cp -p Makefile.in.in *-quot *.header *.sed *.sin ../runtime-po)
  fi
fi

echo "$0: done.  Now you can run './configure'."