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#! /bin/sh
# Merge gnulib sources into Emacs sources.
# Typical usage:
#
#	admin/merge-gnulib

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# Copyright 2012-2020 Free Software Foundation, Inc.
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# This file is part of GNU Emacs.

# GNU Emacs 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.

# GNU Emacs 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
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# along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
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# written by Paul Eggert

GNULIB_URL=git://git.savannah.gnu.org/gnulib.git

GNULIB_MODULES='
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  alloca-opt binary-io byteswap c-ctype c-strcase
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  canonicalize-lgpl
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  careadlinkat close-stream copy-file-range
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  count-leading-zeros count-one-bits count-trailing-zeros
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  crypto/md5-buffer crypto/sha1-buffer crypto/sha256-buffer crypto/sha512-buffer
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  d-type diffseq double-slash-root dtoastr dtotimespec dup2
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  environ execinfo explicit_bzero faccessat
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  fchmodat fcntl fcntl-h fdopendir
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  filemode filename filevercmp flexmember fpieee fstatat fsusage fsync futimens
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  getloadavg getopt-gnu getrandom gettime gettimeofday gitlog-to-changelog
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  ieee754-h ignore-value intprops largefile libgmp lstat
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  manywarnings memmem-simple mempcpy memrchr minmax mkostemp mktime nstrftime
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  pathmax pipe2 pselect pthread_sigmask
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  qcopy-acl readlink readlinkat regex
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  sig2str socklen stat-time std-gnu11 stdalign stddef stdio
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  stpcpy strnlen strtoimax symlink sys_stat sys_time
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  tempname time time_r time_rz timegm timer-time timespec-add timespec-sub
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  update-copyright unlocked-io utimensat
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  vla warnings
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'

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AVOIDED_MODULES='
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  btowc close dup fchdir fstat langinfo lock
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  malloc-posix mbrtowc mbsinit memchr mkdir msvc-inval msvc-nothrow nl_langinfo
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  openat-die opendir pthread-h raise
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  save-cwd select setenv sigprocmask stat stdarg stdbool
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  threadlib tzset unsetenv utime utime-h
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  wchar wcrtomb wctype-h
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'

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GNULIB_TOOL_FLAGS='
  --conditional-dependencies --import --no-changelog --no-vc-files
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  --gnu-make
  --makefile-name=gnulib.mk.in
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'

# The source directory, with a trailing '/'.
# If empty, the source directory is the working directory.
src=$2
case $src in
  */ | '') ;;
  *) src=$src/ ;;
esac

# Gnulib's source directory.
gnulib_srcdir=${1-$src../gnulib}

case $gnulib_srcdir in
  -*) src=- ;;
esac
case $src in
  -*)
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    printf '%s\n' >&2 "$0: usage: $0 [GNULIB_SRCDIR [SRCDIR]]
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    SRCDIR is the Emacs source directory (default: working directory).
    GNULIB_SRCDIR is the Gnulib source directory (default: SRCDIR/../gnulib)."
    exit 1 ;;
esac

test -x "$src"autogen.sh || {
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  printf '%s\n' >&2 "$0: '${src:-.}' is not an Emacs source directory."
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  exit 1
}

test -d "$gnulib_srcdir" ||
git clone -- "$GNULIB_URL" "$gnulib_srcdir" ||
exit

test -x "$gnulib_srcdir"/gnulib-tool || {
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  printf '%s\n' >&2 "$0: '$gnulib_srcdir' is not a Gnulib source directory."
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  exit 1
}

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avoided_flags=
for module in $AVOIDED_MODULES; do
  avoided_flags="$avoided_flags --avoid=$module"
done

"$gnulib_srcdir"/gnulib-tool --dir="$src" $GNULIB_TOOL_FLAGS \
	$avoided_flags $GNULIB_MODULES &&
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rm -- "$src"lib/gl_openssl.h "$src"m4/fcntl-o.m4 \
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      "$src"m4/gl-openssl.m4 \
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      "$src"m4/gnulib-cache.m4 "$src"m4/gnulib-tool.m4 \
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      "$src"m4/manywarnings-c++.m4 \
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      "$src"m4/warn-on-use.m4 "$src"m4/wint_t.m4 &&
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cp -- "$gnulib_srcdir"/build-aux/texinfo.tex "$src"doc/misc &&
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cp -- "$gnulib_srcdir"/build-aux/config.guess \
      "$gnulib_srcdir"/build-aux/config.sub \
      "$gnulib_srcdir"/build-aux/install-sh \
      "$gnulib_srcdir"/build-aux/move-if-change \
   "$src"build-aux &&
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{ test -z "$src" || cd "$src"; } &&
./autogen.sh