build: use gnulib's non-recursive-gnulib-prefix-hack

Suggested by Jim Meyering.

* etc/prefix-gnulib-mk: Remove, as it is now provided by...
* bootstrap.conf (modules): the non-recursive-gnulib-prefix-hack module.
* build-aux/.gitignore, configure.ac, m4/.gitignore: Adjust.

bootstrap.conf

@@ -25,6 +25,7 @@ gnulib_modules='
   gpl-3.0 hash inttypes isnan javacomp-script
   javaexec-script ldexpl malloc-gnu
   mbswidth
+  non-recursive-gnulib-prefix-hack
   obstack
   obstack-printf
   perror progname
@@ -78,7 +79,7 @@ gnulib_tool_option_extras='--symlink --makefile-name=gnulib.mk'
 bootstrap_post_import_hook()
 {
   # Massage lib/gnulib.mk before using it later in the bootstrapping process.
-  etc/prefix-gnulib-mk --lib-name=$gnulib_name lib/$gnulib_mk
+  build-aux/prefix-gnulib-mk --lib-name=$gnulib_name lib/$gnulib_mk
 
   # Ensure that ChangeLog exists, for automake.
   test -f ChangeLog || touch ChangeLog

build-aux/.gitignore

@@ -26,3 +26,4 @@
 /vc-list-files
 /warn-on-use.h
 /ylwrap
+/prefix-gnulib-mk

configure.ac

@@ -187,19 +187,6 @@ AC_SUBST([GCC])
 gt_JAVACOMP([1.3], [1.4])
 gt_JAVAEXEC
 
-# We use gnulib, but from lib/local.mk instead of lib/Makefile.am.
-# So prefix paths with lib/.  See also etc/prefix-gnulib-mk.
-gl_LIBOBJS=`echo "$gl_LIBOBJS" | sed -e 's, , lib/,g'`
-# Listing the names of the variables to prefix is error-prone.
-# Rather, adjust all the AC_SUBST variables whose name ends in '_H',
-# and whose content ends in '.h'.
-for ac_var in $ac_subst_vars
-do
-  eval "ac_val=\$$ac_var"
-  case $ac_var=$ac_val in
-    (*_H=*.h) eval "$ac_var=lib/\$$ac_var";;
-  esac
-done
 AC_CONFIG_FILES([Makefile
                  po/Makefile.in
                  doc/yacc.1])

etc/prefix-gnulib-mk

@@ -1,220 +0,0 @@
-#! /usr/bin/perl -w
-
-use strict;
-use IO::File;
-use Getopt::Long;
-use File::Basename; # for dirname
-
-my $VERSION = '2012-01-21 17:13'; # UTC
-(my $ME = $0) =~ s|.*/||;
-
-my $prefix;
-my $lib_name;
-
-sub usage ($)
-{
-  my ($exit_code) = @_;
-  my $STREAM = ($exit_code == 0 ? *STDOUT : *STDERR);
-  if ($exit_code != 0)
-    {
-      print $STREAM "Try '$ME --help' for more information.\n";
-    }
-  else
-    {
-      print $STREAM <<EOF;
-Usage: $ME --lib-name=NAME FILE
-   or: $ME [--help|--version]
-Rewrite a gnulib-tool-generated FILE like lib/gnulib.mk to work with
-automake's subdir-objects.
-
-OPTIONS:
-
-This option must be specified:
-
-   --lib-name=NAME    library name, often "lib\$project"
-
-The following are optional:
-
-   --help             display this help and exit
-   --version          output version information and exit
-
-EOF
-    }
-  exit $exit_code;
-}
-
-# contents ($FILE_NAME)
-# ---------------------
-sub contents ($)
-{
-  my ($file) = @_;
-  local $/;                     # Turn on slurp-mode.
-  my $f = new IO::File "< $file" or die "$file";
-  my $contents = $f->getline or die "$file";
-  $f->close;
-  return $contents;
-}
-
-# prefix_word ($WORD)
-# -------------------
-# Do not prefix special words such as variable dereferences.  Also,
-# "Makefile" is really "Makefile", since precisely there is no
-# lib/Makefile.
-sub prefix_word ($)
-{
-  local ($_) = @_;
-  $_ = $prefix . $_
-    unless /^-/ || m{^\$\(\w+\)} || $_ eq "Makefile" || $_ eq '\\';
-  return $_;
-}
-
-
-# prefix_words ($TEXT)
-# --------------------
-sub prefix_words ($)
-{
-  local ($_) = @_;
-  s{(\S+)}{prefix_word($1)}gem;
-  return $_;
-}
-
-
-# prefix_assignment ($LHS-AND-ASSIGN-OP, $RHS)
-# --------------------------------------------
-sub prefix_assignment ($$)
-{
-  my ($lhs_and_assign_op, $rhs) = @_;
-  my $res;
-
-  # Some variables are initialized by gnulib.mk, and we don't want
-  # that.  Change '=' to '+='.
-  if ($lhs_and_assign_op =~ /^(SUBDIRS|EXTRA_DIST|BUILT_SOURCES|SUFFIXES|MOSTLYCLEANFILES|CLEANFILES|DISTCLEANFILES|MAINTAINERCLEANFILES|AM_CFLAGS|AM_CPPFLAGS|AM_GNU_GETTEXT) =/)
-    {
-      $lhs_and_assign_op =~ s/=/+=/;
-    }
-  # We don't want to inherit gnulib's AUTOMAKE_OPTIONS, comment them.
-  elsif ($lhs_and_assign_op =~ /^AUTOMAKE_OPTIONS =/)
-    {
-      $lhs_and_assign_op =~ s/^/# /;
-    }
-  # Don't touch suffixes.
-  elsif ($lhs_and_assign_op =~ /^SUFFIXES /)
-    {
-    }
-  # The words are (probably) paths to files in lib/: prefix them.
-  else
-    {
-      $rhs = prefix_words($rhs)
-    }
-
-  # Variables which name depend on the location: libbison_a_SOURCES =>
-  # lib_libbison_a_SOURCES.
-  $lhs_and_assign_op =~ s/($lib_name)/lib_$1/g;
-
-  return $lhs_and_assign_op . $rhs;
-}
-
-# prefix $CONTENTS
-# ----------------
-# $CONTENTS is a Makefile content.  Post-process it so that each file-name
-# is prefixed with $prefix (e.g., "lib/").
-#
-# Relies heavily on the regularity of the file generated by gnulib-tool.
-sub prefix ($)
-{
-  # Work on $_.
-  local ($_) = @_;
-
-  # Prefix all the occurrence of files in rules.  If there is nothing
-  # after in the :, it's probably a phony target, or a suffix rule.
-  # Don't touch it.
-  s{^([-\w+/]+\.[-\w.]+ *: *\S.*)$}
-   {prefix_words($1)}gem;
-
-  # Prefix files in variables.
-  s{^([\w.]+\s*\+?=)(.*)$}
-   {prefix_assignment($1, $2)}gem;
-
-  # These three guys escape all the other regular rules.
-  s{(charset\.alias|ref-add\.sed|ref-del\.sed)}{$prefix$1}g;
-  # Unfortunately, as a result we sometimes have lib/lib.
-  s{($prefix){2}}{$1}g;
-
-  # $(srcdir) is actually $(top_srcdir)/lib.
-  s{\$\(srcdir\)}{\$(top_srcdir)/lib}g;
-
-  # Sometimes, t-$@ is used instead of $@-t, which, of course, does
-  # not work when we have a $@ with a directory in it.
-  s{t-\$\@}{\$\@-t}g;
-
-  # Some AC_SUBST patterns remain and would better be Make macros.
-  s{\@(MKDIR_P)\@}{\$($1)}g;
-
-  # Adjust paths in mkdir.
-  s{(\$\(MKDIR_P\))\s*(\w+)}{$1 $prefix$2}g;
-
-  return $_;
-}
-
-# process ($IN)
-# -------------
-sub process ($)
-{
-  my ($file) = @_;
-  my ($bak) = "$file.bak";
-  rename ($file, $bak) or die;
-  my $contents = contents ($bak);
-  $contents = prefix ($contents);
-  my $out = new IO::File(">$file") or die;
-  print $out $contents;
-}
-
-{
-  GetOptions
-    (
-     'lib-name=s' => \$lib_name,
-     help => sub { usage 0 },
-     version => sub { print "$ME version $VERSION\n"; exit },
-    ) or usage 1;
-
-  my $fail = 0;
-  defined $lib_name
-    or (warn "$ME: no library name; use --lib-name=NAME\n"), $fail = 1;
-
-  # There must be exactly one argument.
-  @ARGV == 0
-    and (warn "$ME: missing FILE argument\n"), $fail = 1;
-  1 < @ARGV
-    and (warn "$ME: too many arguments:\n", join ("\n", @ARGV), "\n"),
-      $fail = 1;
-  $fail
-    and usage 1;
-
-  my $file = $ARGV[0];
-  $prefix = (dirname $file) . '/';
-  warn "prefix=$prefix\n";
-
-  process $file;
-}
-
-### Setup "GNU" style for perl-mode and cperl-mode.
-## Local Variables:
-## perl-indent-level: 2
-## perl-continued-statement-offset: 2
-## perl-continued-brace-offset: 0
-## perl-brace-offset: 0
-## perl-brace-imaginary-offset: 0
-## perl-label-offset: -2
-## cperl-indent-level: 2
-## cperl-brace-offset: 0
-## cperl-continued-brace-offset: 0
-## cperl-label-offset: -2
-## cperl-extra-newline-before-brace: t
-## cperl-merge-trailing-else: nil
-## cperl-continued-statement-offset: 2
-## eval: (add-hook 'write-file-hooks 'time-stamp)
-## time-stamp-start: "my $VERSION = '"
-## time-stamp-format: "%:y-%02m-%02d %02H:%02M"
-## time-stamp-time-zone: "UTC"
-## time-stamp-end: "'; # UTC"
-## End:

m4/.gitignore

@@ -183,3 +183,4 @@
 /xstrndup.m4
 /obstack-printf.m4
 /extern-inline.m4
+/non-recursive-gnulib-prefix-hack.m4