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[PATCH] scripts: quote `like this', not 'like this'


From: Stefano Lattarini
Subject: [PATCH] scripts: quote `like this', not 'like this'
Date: Fri, 21 Sep 2012 12:38:58 +0200

As per updated GCS recommendations.

* bin/autoconf.as, bin/autoreconf.in, bin/autoscan.in, ifnames.in,
bin/autoupdate.in: Throughout these files.
* bin/autoheader.in, bin/autom4te.in: Likewise.  Also, remove some
useless escaping of the "'" single-quote characters, and reformat
some message for better line wrapping.

Signed-off-by: Stefano Lattarini <address@hidden>
---

The testsuite still passes, apart from the same error in the autom4te
pre-selections that is present in master, and that I've recently reported
to bug-autoconf:

  <http://lists.gnu.org/archive/html/bug-autoconf/2012-09/msg00015.html>

 bin/autoconf.as   |  34 +++++------
 bin/autoheader.in |  34 +++++------
 bin/autom4te.in   | 104 +++++++++++++++----------------
 bin/autoreconf.in |  34 +++++------
 bin/autoscan.in   |  38 ++++++------
 bin/autoupdate.in | 180 +++++++++++++++++++++++++++---------------------------
 bin/ifnames.in    |   4 +-
 7 files changed, 214 insertions(+), 214 deletions(-)

diff --git a/bin/autoconf.as b/bin/autoconf.as
index aa85394..c2f9230 100644
--- a/bin/autoconf.as
+++ b/bin/autoconf.as
@@ -1,7 +1,7 @@
 AS_INIT[]dnl                                            -*- shell-script -*-
 m4_divert_push([HEADER-COPYRIGHT])dnl
 # @configure_input@
-# autoconf -- create `configure' using m4 macros
+# autoconf -- create 'configure' using m4 macros.
 
 # Copyright (C) 1992-1994, 1996, 1999-2012 Free Software Foundation,
 # Inc.
@@ -26,9 +26,9 @@ usage=["\
 Usage: $0 [OPTION]... [TEMPLATE-FILE]
 
 Generate a configuration script from a TEMPLATE-FILE if given, or
-\`configure.ac' if present, or else \`configure.in'.  Output is sent
+'configure.ac' if present, or else 'configure.in'.  Output is sent
 to the standard output if TEMPLATE-FILE is given, else into
-\`configure'.
+'configure'.
 
 Operation modes:
   -h, --help                print this help, then exit
@@ -40,15 +40,15 @@ Operation modes:
   -W, --warnings=CATEGORY   report the warnings falling in CATEGORY [syntax]
 
 Warning categories include:
-  \`cross'         cross compilation issues
-  \`obsolete'      obsolete constructs
-  \`syntax'        dubious syntactic constructs
-  \`all'           all the warnings
-  \`no-CATEGORY'   turn off the warnings on CATEGORY
-  \`none'          turn off all the warnings
-  \`error'         warnings are error
+  'cross'         cross compilation issues
+  'obsolete'      obsolete constructs
+  'syntax'        dubious syntactic constructs
+  'all'           all the warnings
+  'no-CATEGORY'   turn off the warnings on CATEGORY
+  'none'          turn off all the warnings
+  'error'         warnings are error
 
-The environment variables \`M4' and \`WARNINGS' are honored.
+The environment variables 'M4' and 'WARNINGS' are honored.
 
 Library directories:
   -B, --prepend-include=DIR  prepend directory DIR to search path
@@ -59,7 +59,7 @@ Tracing:
   -i, --initialization        also trace Autoconf's initialization process
 
 In tracing mode, no configuration script is created.  FORMAT defaults
-to \`\$f:\$l:\$n:\$%'; see \`autom4te --help' for information about FORMAT.
+to '\$f:\$l:\$n:\$%'; see 'autom4te --help' for information about FORMAT.
 
 Report bugs to <address@hidden>.
 GNU Autoconf home page: <http://www.gnu.org/software/autoconf/>.
@@ -76,10 +76,10 @@ There is NO WARRANTY, to the extent permitted by law.
 Written by David J. MacKenzie and Akim Demaille."]
 
 help="\
-Try \`$as_me --help' for more information."
+Try '$as_me --help' for more information."
 
 exit_missing_arg='
-  m4_bpatsubst([AS_ERROR([option `$[1]' requires an argument$as_nl$help])],
+  m4_bpatsubst([AS_ERROR([option '$[1]' requires an argument$as_nl$help])],
     ['], ['\\''])'
 # restore font-lock: '
 
@@ -153,7 +153,7 @@ while test $# -gt 0 ; do
        break ;;
     -* )
        exec >&2
-       AS_ERROR([invalid option `$[1]'$as_nl$help]) ;; #`
+       AS_ERROR([invalid option '$[1]'$as_nl$help]) ;;
     * )
        break ;;
   esac
@@ -164,8 +164,8 @@ case $# in
   0)
     if test -f configure.ac; then
       if test -f configure.in; then
-       AS_ECHO(["$as_me: warning: both \`configure.ac' and \`configure.in' are 
present."]) >&2
-       AS_ECHO(["$as_me: warning: proceeding with \`configure.ac'."]) >&2
+       AS_ECHO(["$as_me: warning: both 'configure.ac' and 'configure.in' are 
present."]) >&2
+       AS_ECHO(["$as_me: warning: proceeding with 'configure.ac'."]) >&2
       fi
       infile=configure.ac
     elif test -f configure.in; then
diff --git a/bin/autoheader.in b/bin/autoheader.in
index d81a313..dc3e25f 100644
--- a/bin/autoheader.in
+++ b/bin/autoheader.in
@@ -5,7 +5,7 @@
 eval 'case $# in 0) exec @PERL@ -S "$0";; *) exec @PERL@ -S "$0" "$@";; esac'
     if 0;
 
-# autoheader -- create `config.h.in' from `configure.ac'
+# autoheader -- create 'config.h.in' from 'configure.ac'.
 
 # Copyright (C) 1992-1994, 1996, 1998-2012 Free Software Foundation,
 # Inc.
@@ -46,7 +46,7 @@ use Autom4te::General;
 use Autom4te::XFile;
 use strict;
 
-# Using `do FILE', we need `local' vars.
+# Using 'do FILE', we need 'local' vars.
 use vars qw ($config_h %verbatim %symbol);
 
 # Lib files.
@@ -61,9 +61,9 @@ my @include;
 # -----
 $help = "Usage: $0 [OPTION]... [TEMPLATE-FILE]
 
-Create a template file of C \`\#define\' statements for \`configure\' to
-use.  To this end, scan TEMPLATE-FILE, or \`configure.ac\' if present,
-or else \`configure.in\'.
+Create a template file of C '\#define' statements for 'configure' to
+use.  To this end, scan TEMPLATE-FILE, or 'configure.ac' if present,
+or else 'configure.in'.
 
   -h, --help               print this help, then exit
   -V, --version            print version number, then exit
@@ -140,16 +140,16 @@ my $acconfig_h = find_file ("acconfig.h?",
 if ($config_h_top || $config_h_bot || $acconfig_h)
   {
     my $msg = << "END";
-    Using auxiliary files such as \`acconfig.h\', \`config.h.bot\'
-    and \`config.h.top\', to define templates for \`config.h.in\'
+    Using auxiliary files such as 'acconfig.h', 'config.h.bot'
+    and 'config.h.top', to define templates for 'config.h.in'
     is deprecated and discouraged.
 
-    Using the third argument of \`AC_DEFINE\' and
-    \`AC_DEFINE_UNQUOTED\' allows one to define a template without
-    \`acconfig.h\':
+    Using the third argument of 'AC_DEFINE_UNQUOTED' and
+    'AC_DEFINE' allows one to define a template without
+    'acconfig.h':
 
       AC_DEFINE([NEED_FUNC_MAIN], 1,
-               [Define if a function \`main\' is needed.])
+               [Define if a function 'main' is needed.])
 
     More sophisticated templates can also be produced, see the
     documentation.
@@ -175,14 +175,14 @@ verb "$me: running $autoconf to trace from $ARGV[0]";
 my $quoted_tmp = shell_quote ($tmp);
 xsystem ("$autoconf"
         # If you change this list, update the
-        # `Autoheader-preselections' section of autom4te.in.
+        # 'Autoheader-preselections' section of autom4te.in.
         . ' --trace AC_CONFIG_HEADERS:\'$$config_h ||= \'"\'"\'$1\'"\'"\';\''
         . ' --trace AH_OUTPUT:\'$$verbatim{\'"\'"\'$1\'"\'"\'} = 
\'"\'"\'$2\'"\'"\';\''
         . ' --trace AC_DEFINE_TRACE_LITERAL:\'$$symbol{\'"\'"\'$1\'"\'"\'} = 
1;\''
         . " " . shell_quote ($ARGV[0]) . " >$quoted_tmp/traces.pl");
 
 local (%verbatim, %symbol);
-debug "$me: \`do'ing $tmp/traces.pl:\n" . `sed 's/^/| /' 
$quoted_tmp/traces.pl`;
+debug "$me: 'do'ing $tmp/traces.pl:\n" . `sed 's/^/| /' $quoted_tmp/traces.pl`;
 do "$tmp/traces.pl";
 warn "couldn't parse $tmp/traces.pl: $@" if $@;
 unless ($config_h)
@@ -197,7 +197,7 @@ $config_h =~ s/ .*//;
 ($config_h, $config_h_in) = split (':', $config_h, 2);
 $config_h_in ||= "$config_h.in";
 
-# %SYMBOL might contain things like `F77_FUNC(name,NAME)', but we keep
+# %SYMBOL might contain things like 'F77_FUNC(name,NAME)', but we keep
 # only the name of the macro.
 %symbol = map { s/\(.*//; $_ => 1 } keys %symbol;
 
@@ -217,7 +217,7 @@ if ($config_h_top)
       }
   }
 
-# Dump `acconfig.h', except for its bottom portion.
+# Dump 'acconfig.h', except for its bottom portion.
 if ($acconfig_h)
   {
     my $in = new Autom4te::XFile ("< " . open_quote ($acconfig_h));
@@ -229,13 +229,13 @@ if ($acconfig_h)
       }
   }
 
-# Dump the templates from `configure.ac'.
+# Dump the templates from 'configure.ac'.
 foreach (sort keys %verbatim)
   {
     print $out "\n$verbatim{$_}\n";
   }
 
-# Dump bottom portion of `acconfig.h'.
+# Dump bottom portion of 'acconfig.h'.
 if ($acconfig_h)
   {
     my $in = new Autom4te::XFile ("< " . open_quote ($acconfig_h));
diff --git a/bin/autom4te.in b/bin/autom4te.in
index 11773c9..16387a1 100644
--- a/bin/autom4te.in
+++ b/bin/autom4te.in
@@ -72,10 +72,10 @@ my $flock_implemented = '@PERL_FLOCK@';
 my %trace;
 
 # The macros the user will want to trace in the future.
-# We need `include' to get the included file, `m4_pattern_forbid' and
-# `m4_pattern_allow' to check the output.
+# We need 'include' to get the included file, 'm4_pattern_forbid' and
+# 'm4_pattern_allow' to check the output.
 #
-# FIXME: What about `sinclude'?
+# FIXME: What about 'sinclude'?
 my @preselect = ('include',
                 'm4_pattern_allow', 'm4_pattern_forbid',
                 '_m4_warn');
@@ -105,20 +105,20 @@ map { s/:.*//;s/\W// } @m4_builtin;
 
 # %M4_BUILTIN_ALTERNATE_NAME
 # --------------------------
-# The builtins are renamed, e.g., `define' is renamed `m4_define'.
-# So map `define' to `m4_define' and conversely.
+# The builtins are renamed, e.g., 'define' is renamed 'm4_define'.
+# So map 'define' to 'm4_define' and conversely.
 # Some macros don't follow this scheme: be sure to properly map to their
 # alternate name too.
 #
 # FIXME: Trace status of renamed builtins was fixed in M4 1.4.5, which
 # we now depend on; do we still need to do this mapping?
 #
-# So we will merge them, i.e., tracing `BUILTIN' or tracing
-# `m4_BUILTIN' will be the same: tracing both, but honoring the
+# So we will merge them, i.e., tracing 'BUILTIN' or tracing
+# 'm4_BUILTIN' will be the same: tracing both, but honoring the
 # *last* trace specification.
 #
-# FIXME: This is not enough: in the output `$0' will be `BUILTIN'
-# sometimes and `m4_BUILTIN' at others.  We should return a unique name,
+# FIXME: This is not enough: in the output '$0' will be 'BUILTIN'
+# sometimes and 'm4_BUILTIN' at others.  We should return a unique name,
 # the one specified by the user.
 #
 # FIXME: To be absolutely rigorous, I would say that given that we
@@ -139,38 +139,38 @@ $help = "Usage: $0 [OPTION]... [FILES]
 Run GNU M4 on the FILES, avoiding useless runs.  Output the traces if tracing,
 the frozen file if freezing, otherwise the expansion of the FILES.
 
-If some of the FILES are named \`FILE.m4f\' they are considered to be M4
+If some of the FILES are named 'FILE.m4f' they are considered to be M4
 frozen files of all the previous files (which are therefore not loaded).
-If \`FILE.m4f\' is not found, then \`FILE.m4\' will be used, together with
+If 'FILE.m4f' is not found, then 'FILE.m4' will be used, together with
 all the previous files.
 
 Some files may be optional, i.e., will only be processed if found in the
-include path, but then must end in \`.m4?\';  the question mark is not part of
-the actual file name.
+include path, but then must end in '.m4?';  the question mark is not part
+of the actual file name.
 
 Operation modes:
   -h, --help               print this help, then exit
   -V, --version            print version number, then exit
   -v, --verbose            verbosely report processing
-  -d, --debug              don\'t remove temporary files
-  -o, --output=FILE        save output in FILE (defaults to \`-\', stdout)
-  -f, --force              don\'t rely on cached values
+  -d, --debug              don't remove temporary files
+  -o, --output=FILE        save output in FILE (defaults to '-', stdout)
+  -f, --force              don't rely on cached values
   -W, --warnings=CATEGORY  report the warnings falling in CATEGORY
   -l, --language=LANG      specify the set of M4 macros to use
   -C, --cache=DIRECTORY    preserve results for future runs in DIRECTORY
       --no-cache           disable the cache
   -m, --mode=OCTAL         change the non trace output file mode (0666)
-  -M, --melt               don\'t use M4 frozen files
+  -M, --melt               don't use M4 frozen files
 
 Languages include:
-  \`Autoconf\'   create Autoconf configure scripts
-  \`Autotest\'   create Autotest test suites
-  \`M4sh\'       create M4sh shell scripts
-  \`M4sugar\'    create M4sugar output
+  'Autoconf'   create Autoconf configure scripts
+  'Autotest'   create Autotest test suites
+  'M4sh'       create M4sh shell scripts
+  'M4sugar'    create M4sugar output
 
 " . Autom4te::ChannelDefs::usage . "
 
-The environment variables \`M4\' and \`WARNINGS\' are honored.
+The environment variables 'M4' and 'WARNINGS' are honored.
 
 Library directories:
   -B, --prepend-include=DIR  prepend directory DIR to search path
@@ -183,7 +183,7 @@ Tracing:
 Freezing:
   -F, --freeze   produce an M4 frozen state file for FILES
 
-FORMAT defaults to \`\$f:\$l:\$n:\$%\', and can use the following escapes:
+FORMAT defaults to '\$f:\$l:\$n:\$%', and can use the following escapes:
   \$\$     literal \$
   \$f     file where macro was called
   \$l     line where macro was called
@@ -347,9 +347,9 @@ sub parse_args ()
      "I|include=s"         => address@hidden,
 
      # Tracing:
-     # Using a hash for traces is seducing.  Unfortunately, upon `-t FOO',
-     # instead of mapping `FOO' to undef, Getopt maps it to `1', preventing
-     # us from distinguishing `-t FOO' from `-t FOO=1'.  So let's do it
+     # Using a hash for traces is seducing.  Unfortunately, upon '-t FOO',
+     # instead of mapping 'FOO' to undef, Getopt maps it to '1', preventing
+     # us from distinguishing '-t FOO' from '-t FOO=1'.  So let's do it
      # by hand.
      "t|trace=s"     => address@hidden,
      "p|preselect=s" => address@hidden,
@@ -363,7 +363,7 @@ sub parse_args ()
     );
 
   fatal "too few arguments
-Try `$me --help' for more information."
+Try '$me --help' for more information."
     unless @ARGV;
 
   # Freezing:
@@ -388,13 +388,13 @@ Try `$me --help' for more information."
 
   # Normalize the includes: the first occurrence is enough, several is
   # a pain since it introduces a useless difference in the path which
-  # invalidates the cache.  And strip `.' which is implicit and always
+  # invalidates the cache.  And strip '.' which is implicit and always
   # first.
   @include = grep { !/^\.$/ } uniq (reverse(@prepend_include), @include);
 
   # Convert @trace to %trace, and work around the M4 builtins tracing
   # problem.
-  # The default format is `$f:$l:$n:$%'.
+  # The default format is '$f:$l:$n:$%'.
   foreach (@trace)
     {
       /^([^:]+)(?::(.*))?$/ms;
@@ -413,9 +413,9 @@ Try `$me --help' for more information."
   # discarded: the frozen file is supposed to include them all.
   #
   # We don't want to depend upon m4's --include to find the top level
-  # files, so we use `find_file' here.  Try to get a canonical name,
+  # files, so we use 'find_file' here.  Try to get a canonical name,
   # as it's part of the key for caching.  And some files are optional
-  # (also handled by `find_file').
+  # (also handled by 'find_file').
   my @argv;
   foreach (@ARGV)
     {
@@ -425,7 +425,7 @@ Try `$me --help' for more information."
        }
       elsif (/\.m4f$/)
        {
-         # Frozen files are optional => pass a `?' to `find_file'.
+         # Frozen files are optional => pass a '?' to 'find_file'.
          my $file = find_file ("$_?", @include);
          if (!$melt && $file)
            {
@@ -484,7 +484,7 @@ sub handle_m4 ($@)
 # warn_forbidden ($WHERE, $WORD, %FORBIDDEN)
 # ------------------------------------------
 # $WORD is forbidden.  Warn with a dedicated error message if in
-# %FORBIDDEN, otherwise a simple `error: possibly undefined macro'
+# %FORBIDDEN, otherwise a simple 'error: possibly undefined macro'
 # will do.
 my $first_warn_forbidden = 1;
 sub warn_forbidden ($$%)
@@ -572,7 +572,7 @@ sub handle_output ($$)
       $res = $_;
 
       # Don't complain in comments.  Well, until we have something
-      # better, don't consider `#include' etc. are comments.
+      # better, don't consider '#include' etc. are comments.
       s/\#.*//
        unless /^\#\s*(if|include|endif|ifdef|ifndef|define)\b/;
       foreach (split (/\W+/))
@@ -604,7 +604,7 @@ sub handle_output ($$)
       while ($_ = $file->getline)
        {
          # Don't complain in comments.  Well, until we have something
-         # better, don't consider `#include' etc. to be comments.
+         # better, don't consider '#include' etc. to be comments.
          s/\#.*//
            unless /^\#(if|include|endif|ifdef|ifndef|define)\b/;
 
@@ -703,10 +703,10 @@ sub trace_format_to_m4 ($)
 # handle_traces($REQ, $OUTPUT, %TRACE)
 # ------------------------------------
 # We use M4 itself to process the traces.  But to avoid name clashes when
-# processing the traces, the builtins are disabled, and moved into `at_'.
-# Actually, all the low level processing macros are in `at_' (and `_at_').
-# To avoid clashes between user macros and `at_' macros, the macros which
-# implement tracing are in `AT_'.
+# processing the traces, the builtins are disabled, and moved into 'at_'.
+# Actually, all the low level processing macros are in 'at_' (and '_at_').
+# To avoid clashes between user macros and 'at_' macros, the macros which
+# implement tracing are in 'AT_'.
 #
 # Having $REQ is needed to neutralize the macros which have been traced,
 # but are not wanted now.
@@ -714,7 +714,7 @@ sub handle_traces ($$%)
 {
   my ($req, $output, %trace) = @_;
 
-  verb "formatting traces for `$output': " . join (', ', sort keys %trace);
+  verb "formatting traces for '$output': " . join (', ', sort keys %trace);
 
   # Processing the traces.
   my $trace_m4 = new Autom4te::XFile ("> " . open_quote ("$tmp/traces.m4"));
@@ -726,9 +726,9 @@ sub handle_traces ($$%)
   # ----------------------------------
   # List the elements, separating then with SEPARATOR.
   # MODE can be:
-  #  `at'       -- the elements are enclosed in brackets.
-  #  `star'     -- the elements are listed as are.
-  #  `percent'  -- the elements are `flattened': spaces are singled out,
+  #  'at'       -- the elements are enclosed in brackets.
+  #  'star'     -- the elements are listed as are.
+  #  'percent'  -- the elements are 'flattened': spaces are singled out,
   #                and no new line remains.
   define([_at_at],
   [at_ifelse([$#], [1], [],
@@ -746,7 +746,7 @@ sub handle_traces ($$%)
             [[$2][$1]$0([$1], at_shift(at_shift($@)))])])
 
   # FLATTEN quotes its result.
-  # Note that the second pattern is `newline, tab or space'.  Don't lose
+  # Note that the second pattern is 'newline, tab or space'.  Don't lose
   # the tab!
   define([at_flatten],
   [at_patsubst(at_patsubst([[[$1]]], [\\\n]), [[\n\t ]+], [ ])])
@@ -760,14 +760,14 @@ EOF
   s/^  //mg;s/\\t/\t/mg;s/\\n/\n/mg;
   print $trace_m4 $_;
 
-  # If you trace `define', then on `define([m4_exit], defn([m4exit])' you
+  # If you trace 'define', then on 'define([m4_exit], defn([m4exit])' you
   # will produce
   #
   #    AT_define([m4sugar.m4], [115], [1], [define], [m4_exit], <m4exit>)
   #
-  # Since `<m4exit>' is not quoted, the outer m4, when processing
-  # `trace.m4' will exit prematurely.  Hence, move all the builtins to
-  # the `at_' name space.
+  # Since '<m4exit>' is not quoted, the outer m4, when processing
+  # 'trace.m4' will exit prematurely.  Hence, move all the builtins to
+  # the 'at_' name space.
 
   print $trace_m4 "# Copy the builtins.\n";
   map { print $trace_m4 "define([at_$_], defn([$_]))\n" } @m4_builtin;
@@ -817,7 +817,7 @@ EOF
   # | AT_AC_SUBST([configure.ac], [3], [1], [AC_SUBST], [exec_prefix], [NONE])
   #
   # Pay attention that the file name might include colons, if under DOS
-  # for instance, so we don't use `[^:]+'.
+  # for instance, so we don't use '[^:]+'.
   my $traces = new Autom4te::XFile ("< " . open_quote ($tcache . $req->id));
   while ($_ = $traces->getline)
     {
@@ -858,7 +858,7 @@ EOF
 # up_to_date ($REQ)
 # -----------------
 # Are the cache files of $REQ up to date?
-# $REQ is `valid' if it corresponds to the request and exists, which
+# $REQ is 'valid' if it corresponds to the request and exists, which
 # does not mean it is up to date.  It is up to date if, in addition,
 # its files are younger than its dependencies.
 sub up_to_date ($)
@@ -939,7 +939,7 @@ sub freeze ($)
   fatal "freezing produced output:\n$result"
     if $result;
 
-  # If freezing produces output, something went wrong: a bad `divert',
+  # If freezing produces output, something went wrong: a bad 'divert',
   # or an improper paren etc.
   xsystem ("$m4"
           . ' --fatal-warning'
@@ -1037,7 +1037,7 @@ if (%trace)
   {
     # Always produce traces, since even if the output is young enough,
     # there is no guarantee that the traces use the same *format*
-    # (e.g., `-t FOO:foo' and `-t FOO:bar' are both using the same M4
+    # (e.g., '-t FOO:foo' and '-t FOO:bar' are both using the same M4
     # traces, hence the M4 traces cache is usable, but its formatting
     # will yield different results).
     handle_traces ($req, $output, %trace);
diff --git a/bin/autoreconf.in b/bin/autoreconf.in
index acf25d4..7259666 100644
--- a/bin/autoreconf.in
+++ b/bin/autoreconf.in
@@ -54,15 +54,15 @@ use strict;
 # -----
 $help = "Usage: $0 [OPTION]... [DIRECTORY]...
 
-Run `autoconf' (and `autoheader', `aclocal', `automake', `autopoint'
-(formerly `gettextize'), and `libtoolize' where appropriate)
+Run 'autoconf' (and 'autoheader', 'aclocal', 'automake', 'autopoint'
+(formerly 'gettextize'), and 'libtoolize' where appropriate)
 repeatedly to remake the GNU Build System files in specified
-DIRECTORIES and their subdirectories (defaulting to `.').
+DIRECTORIES and their subdirectories (defaulting to '.').
 
 By default, it only remakes those files that are older than their
 sources.  If you install new versions of the GNU Build System,
-you can make `autoreconf' remake all of the files by giving it the
-`--force' option.
+you can make 'autoreconf' remake all of the files by giving it the
+'--force' option.
 
 Operation modes:
   -h, --help               print this help, then exit
@@ -78,8 +78,8 @@ Operation modes:
 
 " . Autom4te::ChannelDefs::usage . "
 
-The environment variable \`WARNINGS\' is honored.  Some subtools might
-support other warning types, using \`all' is encouraged.
+The environment variable 'WARNINGS' is honored.  Some subtools might
+support other warning types, using 'all' is encouraged.
 
 Library directories:
   -B, --prepend-include=DIR  prepend directory DIR to search path
@@ -134,7 +134,7 @@ my @include;
 # List of command line warning requests.
 my @warning;
 
-# Rerun `./configure && make'?
+# Rerun './configure && make'?
 my $run_make = 0;
 
 # Recurse into subpackages
@@ -354,7 +354,7 @@ sub autoreconf_current_directory ()
 
   # Gettext is a bit of a problem: its macros are not necessarily
   # visible to aclocal, so if we start with a completely striped down
-  # package (think of a fresh CVS checkout), running `aclocal' first
+  # package (think of a fresh CVS checkout), running 'aclocal' first
   # will fail: the Gettext macros are missing.
   #
   # Therefore, we can't use the traces to decide if we use Gettext or
@@ -366,7 +366,7 @@ sub autoreconf_current_directory ()
   # prevents one to embed AM_GNU_GETTEXT_VERSION in another *.m4, but
   # anyway we don't limit the generality, since... that's what
   # autopoint does.  Actually, it is even more restrictive, as it
-  # greps for `^AM_GNU_GETTEXT_VERSION('.  We did this above, while
+  # greps for '^AM_GNU_GETTEXT_VERSION('.  We did this above, while
   # scanning configure.ac.
   if (!$uses_gettext)
     {
@@ -466,7 +466,7 @@ sub autoreconf_current_directory ()
      . join (' ',
             map { ' --trace=' . $_ . ':\$n::\${::}%' }
             # If you change this list, update the
-            # `Autoreconf-preselections' section of autom4te.in.
+            # 'Autoreconf-preselections' section of autom4te.in.
             'AC_CONFIG_AUX_DIR',
             'AC_CONFIG_HEADERS',
             'AC_CONFIG_SUBDIRS',
@@ -580,7 +580,7 @@ sub autoreconf_current_directory ()
   # Running autoconf.  #
   # ------------------ #
 
-  # Don't try to be smarter than `autoconf', which does its own up to
+  # Don't try to be smarter than 'autoconf', which does its own up to
   # date checks.
   #
   # We prefer running autoconf before autoheader, because (i) the
@@ -623,8 +623,8 @@ sub autoreconf_current_directory ()
   else
     {
       # We should always run automake, and let it decide whether it shall
-      # update the file or not.  In fact, the effect of `$force' is already
-      # included in `$automake' via `--no-force'.
+      # update the file or not.  In fact, the effect of '$force' is already
+      # included in '$automake' via '--no-force'.
       xsystem ($automake);
     }
 
@@ -666,7 +666,7 @@ sub autoreconf ($)
 
   # The format for this message is not free: taken from Emacs, itself
   # using GNU Make's format.
-  verb "Entering directory `$directory'";
+  verb "Entering directory '$directory'";
   chdir $directory
     or error "cannot chdir to $directory: $!";
 
@@ -674,7 +674,7 @@ sub autoreconf ($)
 
   # The format is not free: taken from Emacs, itself using GNU Make's
   # format.
-  verb "Leaving directory `$directory'";
+  verb "Leaving directory '$directory'";
   chdir $cwd
     or error "cannot chdir to $cwd: $!";
 }
@@ -690,7 +690,7 @@ mktmpdir ('ar');
 $ENV{'TMPDIR'} = $tmp;
 parse_args;
 
-# Autoreconf all the given configure.ac.  Unless `--no-recursive' is passed,
+# Autoreconf all the given configure.ac.  Unless '--no-recursive' is passed,
 # AC_CONFIG_SUBDIRS will be traversed in &autoreconf_current_directory.
 $ENV{'AUTOM4TE'} = $autom4te;
 for my $directory (@ARGV)
diff --git a/bin/autoscan.in b/bin/autoscan.in
index a67c48d..af85569 100644
--- a/bin/autoscan.in
+++ b/bin/autoscan.in
@@ -68,10 +68,10 @@ my %kind_comment =
    'program'    => 'Checks for programs.',
   );
 
-# $USED{KIND}{ITEM} is the list of locations where the ITEM (of KIND) was used
-# in the user package.
-# For instance $USED{function}{alloca} is the list of `file:line' where
-# `alloca (...)' appears.
+# $USED{KIND}{ITEM} is the list of locations where the ITEM (of KIND) was
+# used in the user package.
+# For instance $USED{function}{alloca} is the list of 'file:line' where
+# 'alloca (...)' appears.
 my %used = ();
 
 # $MACRO{KIND}{ITEM} is the list of macros to use to test ITEM.
@@ -80,8 +80,8 @@ my %used = ();
 my %macro = ();
 
 # $NEEDED_MACROS{MACRO} is an array of locations requiring MACRO.
-# E.g., $NEEDED_MACROS{AC_FUNC_ALLOC} the list of `file:line' containing
-# `alloca (...)'.
+# E.g., $NEEDED_MACROS{AC_FUNC_ALLOC} the list of 'file:line' containing
+# 'alloca (...)'.
 my %needed_macros =
   (
    'AC_PREREQ' => [$me],
@@ -103,8 +103,8 @@ $help = "Usage: $0 [OPTION]... [SRCDIR]
 Examine source files in the directory tree rooted at SRCDIR, or the
 current directory if none is given.  Search the source files for
 common portability problems, check for incompleteness of
-`configure.ac', and create a file `$configure_scan' which is a
-preliminary `configure.ac' for that package.
+'configure.ac', and create a file '$configure_scan' which is a
+preliminary 'configure.ac' for that package.
 
   -h, --help          print this help, then exit
   -V, --version       print version number, then exit
@@ -148,7 +148,7 @@ sub parse_args ()
          'B|prepend-include=s' => address@hidden);
 
   die "$me: too many arguments
-Try `$me --help' for more information.\n"
+Try '$me --help' for more information.\n"
     if @ARGV > 1;
 
   my $srcdir = $ARGV[0] || ".";
@@ -215,8 +215,8 @@ sub used ($$;$)
   my ($kind, $word, $where) = @_;
   $where ||= "$File::Find::name:$.";
   if (
-      # Check for all the libraries.  But `-links' is certainly a
-      # `find' argument, and `-le', a `test' argument.
+      # Check for all the libraries.  But '-links' is certainly a
+      # 'find' argument, and '-le', a 'test' argument.
       ($kind eq 'library' && $word !~ /^(e|inks)$/)
       # Other than libraries are to be checked only if listed in
       # the Autoscan library files.
@@ -322,8 +322,8 @@ sub scan_makefile ($)
        {
          used ('makevar', $1);
        }
-      # Be sure to catch a whole word.  For instance `lex$U.$(OBJEXT)'
-      # is a single token.  Otherwise we might believe `lex' is needed.
+      # Be sure to catch a whole word.  For instance 'lex$U.$(OBJEXT)'
+      # is a single token.  Otherwise we might believe 'lex' is needed.
       foreach my $word (split (/\s+/))
        {
          # Libraries.
@@ -332,8 +332,8 @@ sub scan_makefile ($)
              used ('library', $1);
            }
          # Tokens in the code.
-         # We allow some additional characters, e.g., `+', since
-         # autoscan/programs includes `c++'.
+         # We allow some additional characters, e.g., '+', since
+         # autoscan/programs includes 'c++'.
          if ($word =~ /^[a-zA-Z_][\w+]*$/)
            {
              used ('program', $word);
@@ -385,7 +385,7 @@ sub scan_file ()
   # Save $_ as Find::File requires it to be preserved.
   local $_ = $_;
 
-  # Strip a useless leading `./'.
+  # Strip a useless leading './'.
   $File::Find::name =~ s,^\./,,;
 
   if ($_ ne '.' and -d $_ and
@@ -507,7 +507,7 @@ sub output_libraries ($)
   print $file "\n# Checks for libraries.\n";
   foreach my $word (sort keys %{$used{'library'}})
     {
-      print $file "# FIXME: Replace `main' with a function in `-l$word':\n";
+      print $file "# FIXME: Replace 'main' with a function in '-l$word':\n";
       print $file "AC_CHECK_LIB([$word], [main])\n";
     }
 }
@@ -583,7 +583,7 @@ sub check_configure_ac ($)
 
   # Find what needed macros are invoked in CONFIGURE_AC.
   # I'd be very happy if someone could explain to me why sort (uniq ...)
-  # doesn't work properly: I need `uniq (sort ...)'.  --akim
+  # doesn't work properly: I need 'uniq (sort ...)'.  --akim
   my $trace_option =
     join (' --trace=', '',
          uniq (sort (map { s/\(.*//; $_ } keys %needed_macros)));
@@ -602,7 +602,7 @@ sub check_configure_ac ($)
          # separated macros.  But there is no point.
          foreach my $word (split (/\s|,/, $args[0]))
            {
-             # AC_CHECK_MEMBERS wants `struct' or `union'.
+             # AC_CHECK_MEMBERS wants 'struct' or 'union'.
              if ($macro eq "AC_CHECK_MEMBERS"
                  && $word =~ /^stat.st_/)
                {
diff --git a/bin/autoupdate.in b/bin/autoupdate.in
index 9737d49..0679140 100644
--- a/bin/autoupdate.in
+++ b/bin/autoupdate.in
@@ -60,8 +60,8 @@ my $m4 = $ENV{"M4"} || '@M4@';
 # -----
 $help = "Usage: $0 [OPTION]... [TEMPLATE-FILE]...
 
-Update each TEMPLATE-FILE if given, or `configure.ac' if present,
-or else `configure.in', to the syntax of the current version of
+Update each TEMPLATE-FILE if given, or 'configure.ac' if present,
+or else 'configure.in', to the syntax of the current version of
 Autoconf.  The original files are backed up.
 
 Operation modes:
@@ -168,7 +168,7 @@ sub handle_autoconf_macros ()
   delete $ac_macros{$_}
     foreach (keys %au_macros);
   # Don't keep M4sugar macros which are redefined by Autoconf,
-  # such as `builtin', `changequote' etc.  See autoconf/autoconf.m4.
+  # such as 'builtin', 'changequote' etc.  See autoconf/autoconf.m4.
   delete $ac_macros{$_}
     foreach (keys %m4_builtins);
   error "no current Autoconf macros found"
@@ -228,7 +228,7 @@ $autoconf .= join (' --prepend-include=', '', map { 
shell_quote ($_) } @prepend_
 mktmpdir ('au');
 handle_autoconf_macros;
 
-# $au_changequote -- enable the quote `[', `]' right before any AU macro.
+# $au_changequote -- enable the quote '[', ']' right before any AU macro.
 my $au_changequote =
   's/\b(' . join ('|', keys %au_macros) . ')\b/_au_m4_changequote([,])$1/g';
 
@@ -285,7 +285,7 @@ foreach my $file (@ARGV)
       # Redefine m4_location to fix the line number.
       m4_define([m4_location], [__file__:m4_eval(__line__ - _au__first_line)])
 
-      # Move all the builtins into the `_au_' pseudo namespace
+      # Move all the builtins into the '_au_' pseudo namespace
       m4_include([m4save.m4])
 
       # _au_defun(NAME, BODY)
@@ -310,7 +310,7 @@ foreach my $file (@ARGV)
       # above).  AU macros might use AU macros, which should
       # enable/disable only for the outer AU macros.
       #
-      # `_au_enabled' is used to this end, determining whether we really
+      # '_au_enabled' is used to this end, determining whether we really
       # enable/disable.
 
 
@@ -367,7 +367,7 @@ foreach my $file (@ARGV)
       ## Disable, and process the file.  ##
       ## ------------------------------- ##
       # The AC autoquoting macros are not loaded yet, hence invoking
-      # `_au_disable' would be wrong.
+      # '_au_disable' would be wrong.
       _au__include([unm4.m4])
 
       # Disable special characters, and set the first line number.
@@ -408,13 +408,13 @@ exit 0;
 
 
 #                ## ---------------------------- ##
-#                ## How `autoupdate' functions.  ##
+#                ## How 'autoupdate' functions.  ##
 #                ## ---------------------------- ##
 #
-# The task of `autoupdate' is not trivial: the biggest difficulty being
+# The task of 'autoupdate' is not trivial: the biggest difficulty being
 # that you must limit the changes to the parts that really need to be
 # updated.  Finding a satisfying implementation proved to be quite hard,
-# as this is the fifth implementation of `autoupdate'.
+# as this is the fifth implementation of 'autoupdate'.
 #
 # Below, we will use a simple example of an obsolete macro:
 #
@@ -440,7 +440,7 @@ exit 0;
 # The first implementation was only able to change the name of obsolete
 # macros.
 #
-# The file `acoldnames.m4' defined the old names based on the new names.
+# The file 'acoldnames.m4' defined the old names based on the new names.
 # It was simple then to produce a sed script such as:
 #
 #     s/OLD/NEW/g
@@ -448,7 +448,7 @@ exit 0;
 # Updating merely consisted in running this script on the file to
 # update.
 #
-# This scheme suffers from an obvious limitation: that `autoupdate' was
+# This scheme suffers from an obvious limitation: that 'autoupdate' was
 # unable to cope with new macros that just swap some of its arguments
 # compared to the old macro.  Fortunately, that was enough to upgrade
 # from Autoconf 1 to Autoconf 2.  (But I have no idea whether the
@@ -460,7 +460,7 @@ exit 0;
 #
 # The version 2.15 of Autoconf brought a vast number of changes compared
 # to 2.13, so a solution was needed.  One could think of extending the
-# `sed' scripts with specialized code for complex macros.  However, this
+# 'sed' scripts with specialized code for complex macros.  However, this
 # approach is of course full of flaws:
 #
 # a. the Autoconf maintainers have to write these snippets, which we
@@ -484,7 +484,7 @@ exit 0;
 #     warned), and its code is the code to use when running autoconf,
 #     but that the very same code has to be used when running
 #     autoupdate.  To summarize, the interface I want is
-#     `AU_DEFUN(OLD-NAME, NEW-CODE)'.
+#     'AU_DEFUN(OLD-NAME, NEW-CODE)'.
 #
 #
 # Now for the technical details.
@@ -498,14 +498,14 @@ exit 0;
 # features, m4sugar.m4 is needed.  Please note that the fact that
 # Autoconf's macros are not loaded is positive on two points:
 #
-# - we do get an updated `configure.ac', not a `configure'!
+# - we do get an updated 'configure.ac', not a 'configure'!
 #
 # - the old macros are replaced by *calls* to the new-macros, not the
 #   body of the new macros, since their body is not defined!!!
 #   (Whoa, that's really beautiful!).
 #
 # Additionally we need to disable the quotes when reading the input for
-# two reasons: first because otherwise `m4' will swallow the quotes of
+# two reasons: first because otherwise 'm4' will swallow the quotes of
 # other macros:
 #
 #     NEW([1, 2], 3)
@@ -526,9 +526,9 @@ exit 0;
 # Well, in this case, when running in autoupdate code, each macro first
 # reestablishes the quotes, expands itself, and disables the quotes.
 #
-# Thinking a bit more, you realize that in fact, people may use `define',
-# `ifelse' etc. in their files, and you certainly don't want to process
-# them.  Another example is `dnl': you don't want to remove the
+# Thinking a bit more, you realize that in fact, people may use 'define',
+# 'ifelse' etc. in their files, and you certainly don't want to process
+# them.  Another example is 'dnl': you don't want to remove the
 # comments.  You then realize you don't want exactly to import m4sugar:
 # you want to specify when it is enabled (macros active), and disabled.
 # m4sugar provides m4_disable/m4_enable to this end.
@@ -540,8 +540,8 @@ exit 0;
 # ways, the AC way, and the AU way.
 #
 # One first solution is to check whether acgeneral.m4 was loaded.  But
-# that's definitely not cute.  Another is simply to install `hooks',
-# that is to say, to keep in some place m4 knows, late `define' to be
+# that's definitely not cute.  Another is simply to install 'hooks',
+# that is to say, to keep in some place m4 knows, late 'define' to be
 # triggered *only* in AU mode.
 #
 # You first think of designing AU_DEFUN like this:
@@ -556,18 +556,18 @@ exit 0;
 #                               Disable the quotes.])])
 #
 # but this will not work: NEW-CODE probably uses $1, $2 etc. and these
-# guys will be replaced with the argument of `Store for late AU binding'
+# guys will be replaced with the argument of 'Store for late AU binding'
 # when you call it.
 #
 # I don't think there is a means to avoid this using this technology
 # (remember that $1 etc. are *always* expanded in m4).  You may also try
 # to replace them with $[1] to preserve them for a later evaluation, but
-# if `Store for late AU binding' is properly written, it will remain
+# if 'Store for late AU binding' is properly written, it will remain
 # quoted till the end...
 #
-# You have to change technology.  Since the problem is that `$1'
-# etc. should be `consumed' right away, one solution is to define now a
-# second macro, `AU_OLD-NAME', and to install a hook than binds OLD-NAME
+# You have to change technology.  Since the problem is that '$1'
+# etc. should be 'consumed' right away, one solution is to define now a
+# second macro, 'AU_OLD-NAME', and to install a hook than binds OLD-NAME
 # to AU_OLD-NAME.  Then, autoupdate.m4 just need to run the hooks.  By
 # the way, the same method was used in autoheader.
 #
@@ -577,7 +577,7 @@ exit 0;
 #
 # Actually, this implementation was just a clean up of the previous
 # implementation: instead of defining hooks by hand, m4sugar was equipped
-# with `namespaces'.  What are they?
+# with 'namespaces'.  What are they?
 #
 # Sometimes we want to disable some *set* of macros, and restore them
 # later.  We provide support for this via namespaces.
@@ -587,19 +587,19 @@ exit 0;
 # (i.e., all the definitions it holds).
 #
 # Technically, to define a MACRO in NAMESPACE means to define the macro
-# named `NAMESPACE::MACRO' to the VALUE.  At the same time, we append
-# `undefine(NAME)' in the macro named `m4_disable(NAMESPACE)', and
-# similarly a binding of NAME to the value of `NAMESPACE::MACRO' in
-# `m4_enable(NAMESPACE)'.  These mechanisms allow to bind the macro of
+# named 'NAMESPACE::MACRO' to the VALUE.  At the same time, we append
+# 'undefine(NAME)' in the macro named 'm4_disable(NAMESPACE)', and
+# similarly a binding of NAME to the value of 'NAMESPACE::MACRO' in
+# 'm4_enable(NAMESPACE)'.  These mechanisms allow to bind the macro of
 # NAMESPACE and to unbind them at will.
 #
 # Of course this implementation is really inefficient: m4 has to grow
 # strings which can become quickly huge, which slows it significantly.
 #
-# In particular one should avoid as much as possible to use `define' for
-# temporaries.  Now that `define' has quite a complex meaning, it is an
+# In particular one should avoid as much as possible to use 'define' for
+# temporaries.  Now that 'define' has quite a complex meaning, it is an
 # expensive operations that should be limited to macros.  Use
-# `m4_define' for temporaries.
+# 'm4_define' for temporaries.
 #
 # Private copies of the macros we used in entering / exiting the m4sugar
 # namespace.  It is much more convenient than fighting with the renamed
@@ -610,8 +610,8 @@ exit 0;
 # Those two implementations suffered from serious problems:
 #
 # - namespaces were really expensive, and incurred a major performance
-#   loss on `autoconf' itself, not only `autoupdate'.  One solution
-#   would have been the limit the use of namespaces to `autoupdate', but
+#   loss on 'autoconf' itself, not only 'autoupdate'.  One solution
+#   would have been the limit the use of namespaces to 'autoupdate', but
 #   that's again some complications on m4sugar, which really doesn't need
 #   this.  So we wanted to get rid of the namespaces.
 #
@@ -620,7 +620,7 @@ exit 0;
 #
 #     foo([1, 2])
 #
-#   m4 saw 2 arguments: `[1'and `2]'.  A simple solution, somewhat
+#   m4 saw 2 arguments: '[1'and '2]'.  A simple solution, somewhat
 #   fragile, is to reestablish the quotes right before all the obsolete
 #   macros, i.e., to use sed so that the previous text becomes
 #
@@ -672,12 +672,12 @@ exit 0;
 #        0)
 #
 # Grpmh.  Two problems.  A minor problem: it would have been much better
-# to have the `m4_eval' computed, and a major problem: you lost the
+# to have the 'm4_eval' computed, and a major problem: you lost the
 # quotation in the result.
 #
 # Let's address the big problem first.  One solution is to define any
 # modern macro to rewrite its calls with the proper quotation, thanks to
-# `$@'.  Again, tracing the `define's makes it possible to know which
+# '$@'.  Again, tracing the 'define's makes it possible to know which
 # are these macros, so you input is:
 #
 #     divert(-1)dnl
@@ -700,10 +700,10 @@ exit 0;
 #     NEW([1, 2],[m4_eval(1 + 2)])
 #     NEW([0, 0],[0])
 #
-# Our problem is solved, i.e., the first call to `NEW' is properly
+# Our problem is solved, i.e., the first call to 'NEW' is properly
 # quoted, but introduced another problem: we changed the layout of the
 # second calls, which can be a drama in the case of huge macro calls
-# (think of `AC_TRY_RUN' for instance).  This example didn't show it,
+# (think of 'AC_TRY_RUN' for instance).  This example didn't show it,
 # but we also introduced parens to macros which did not have some:
 #
 #     AC_INIT
@@ -715,8 +715,8 @@ exit 0;
 # Additionally, we introduced quotes that were not there before, which is
 # OK in most cases, but could change the semantics of the file.
 #
-# Cruel dilemma: we do want the auto-quoting definition of `NEW' when
-# evaluating `OLD', but we don't when we evaluate the second `NEW'.
+# Cruel dilemma: we do want the auto-quoting definition of 'NEW' when
+# evaluating 'OLD', but we don't when we evaluate the second 'NEW'.
 # Back to namespaces?
 #
 # No.
@@ -742,12 +742,12 @@ exit 0;
 #     NEW([0, 0],
 #        0)
 #
-# i.e., the new value of `OLD' is precomputed using the auto-quoting
-# definition of `NEW' and the m4 builtins.  We'll see how afterwards,
+# i.e., the new value of 'OLD' is precomputed using the auto-quoting
+# definition of 'NEW' and the m4 builtins.  We'll see how afterwards,
 # let's finish with the replacement.
 #
 # Of course the solution above is wrong: if there were other calls to
-# `OLD' with different values, we would smash them to the same value.
+# 'OLD' with different values, we would smash them to the same value.
 # But it is quite easy to generalize the scheme above:
 #
 #     divert(-1)dnl
@@ -764,7 +764,7 @@ exit 0;
 #     NEW([0, 0],
 #        0)
 #
-# i.e., for each call to obsolete macros, we build an array `call =>
+# i.e., for each call to obsolete macros, we build an array 'call =>
 # value', and use a macro to dispatch these values.  This results in:
 #
 #     dnl The Unbelievable Truth
@@ -772,8 +772,8 @@ exit 0;
 #     NEW([0, 0],
 #        0)
 #
-# In French, we say `Youpi !', which you might roughly translate as
-# `Yippee!'.
+# In French, we say 'Youpi !', which you might roughly translate as
+# 'Yippee!'.
 #
 #
 # # First step: computation
@@ -801,27 +801,27 @@ exit 0;
 #        0)
 #
 #
-# # Computing the `values' section
+# # Computing the 'values' section
 # # ..............................
 #
 # First we need to get the list of all the AU macro uses.  To this end,
-# first get the list of all the AU macros names by tracing `AU_DEFUN' in
+# first get the list of all the AU macros names by tracing 'AU_DEFUN' in
 # the initialization of autoconf.  This list is computed in the file
-# `au.txt' below.
+# 'au.txt' below.
 #
 # Then use this list to trace all the AU macro uses in the input.  The
 # goal is obtain in the case of our example:
 #
 #     [define([OLD([1],[2])],]@<<@OLD([1],[2])@>>@[)]
 #
-# This is the file `values.in' below.
+# This is the file 'values.in' below.
 #
 # We want to evaluate this with only the builtins (in fact m4sugar), the
-# auto-quoting definitions of the new macros (`new.m4'), and the
-# definition of the old macros (`old.m4').  Computing these last two
-# files is easy: it's just a matter of using the right `--trace' option.
+# auto-quoting definitions of the new macros ('new.m4'), and the
+# definition of the old macros ('old.m4').  Computing these last two
+# files is easy: it's just a matter of using the right '--trace' option.
 #
-# So the content of `values.in' is:
+# So the content of 'values.in' is:
 #
 #     include($autoconf_dir/m4sugar.m4)
 #     m4_include(new.m4)
@@ -833,30 +833,30 @@ exit 0;
 #
 #     define([OLD([1],[2])],@<<@NEW([1, 2], [3])@>>@)
 #
-# Transform `@<<@' and `@>>@' into quotes and we get
+# Transform '@<<@' and '@>>@' into quotes and we get
 #
 #     define([OLD([1],[2])],[NEW([1, 2], [3])])
 #
-# This is `values.m4'.
+# This is 'values.m4'.
 #
 #
-# # Computing the `dispatcher' section
+# # Computing the 'dispatcher' section
 # # ..................................
 #
-# The `prologue', and the `disabler' are simple and need no commenting.
+# The 'prologue', and the 'disabler' are simple and need no commenting.
 #
-# To compute the `dispatcher' (`dispatch.m4'), again, it is a simple
-# matter of using the right `--trace'.
+# To compute the 'dispatcher' ('dispatch.m4'), again, it is a simple
+# matter of using the right '--trace'.
 #
 # Finally, the input is not exactly the input file, rather it is the
-# input file with the added `changequote'.  To this end, we build
-# `quote.sed'.
+# input file with the added 'changequote'.  To this end, we build
+# 'quote.sed'.
 #
 #
 # # Putting it all together
 # # .......................
 #
-# We build the file `input.m4' which contains:
+# We build the file 'input.m4' which contains:
 #
 #     divert(-1)dnl
 #     changequote([, ])
@@ -875,9 +875,9 @@ exit 0;
 # And we just run m4 on it.  Et voila`, Monsieur !  Mais oui, mais oui.
 #
 # Well, there are a few additional technicalities.  For instance, we
-# rely on `changequote', `ifelse' and `defn', but we don't want to
+# rely on 'changequote', 'ifelse' and 'defn', but we don't want to
 # interpret the changequotes of the user, so we simply use another name:
-# `_au_changequote' etc.
+# '_au_changequote' etc.
 #
 #
 # # Failure of the fourth approach
@@ -885,14 +885,14 @@ exit 0;
 #
 # This approach is heavily based on traces, but then there is an obvious
 # problem: non expanded code will never be seen.  In particular, the body
-# of a `define' definition is not seen, so on the input
+# of a 'define' definition is not seen, so on the input
 #
 #        define([idem], [OLD(0, [$1])])
 #
-# autoupdate would never see the `OLD', and wouldn't have updated it.
-# Worse yet, if `idem(0)' was used later, then autoupdate sees that
-# `OLD' is used, computes the result for `OLD(0, 0)' and sets up a
-# dispatcher for `OLD'.  Since there was no computed value for `OLD(0,
+# autoupdate would never see the 'OLD', and wouldn't have updated it.
+# Worse yet, if 'idem(0)' was used later, then autoupdate sees that
+# 'OLD' is used, computes the result for 'OLD(0, 0)' and sets up a
+# dispatcher for 'OLD'.  Since there was no computed value for 'OLD(0,
 # [$1])', the dispatcher would have replaced with... nothing, leading
 # to
 #
@@ -920,7 +920,7 @@ exit 0;
 #     OLD(1, 2)
 #     NEW([0, 0], [0])
 #
-# you evaluate `input.m4':
+# you evaluate 'input.m4':
 #
 #     divert(-1)
 #     changequote([, ])
@@ -932,7 +932,7 @@ exit 0;
 #     OLD(1, 2)
 #     NEW([0, 0], [0])
 #
-# where `m4_disable' undefines the m4 and m4sugar, and disables the quotes
+# where 'm4_disable' undefines the m4 and m4sugar, and disables the quotes
 # and comments:
 #
 #     define([m4_disable],
@@ -941,22 +941,22 @@ exit 0;
 #     changecom(#)
 #     changequote()])
 #
-# `m4_enable' does the converse: reestablish quotes and comments
-# --easy--, reestablish m4sugar --easy: just load `m4sugar.m4' again-- and
+# 'm4_enable' does the converse: reestablish quotes and comments
+# --easy--, reestablish m4sugar --easy: just load 'm4sugar.m4' again-- and
 # reenable the builtins.  This later task requires that you first save
-# the builtins.  And BTW, the definition above of `m4_disable' cannot
-# work: you undefined `changequote' before using it!  So you need to use
+# the builtins.  And BTW, the definition above of 'm4_disable' cannot
+# work: you undefined 'changequote' before using it!  So you need to use
 # your privates copies of the builtins.  Let's introduce three files for
 # this:
 #
-#  `m4save.m4'
-#    moves the m4 builtins into the `_au_' pseudo namespace,
-#  `unm4.m4'
+#  'm4save.m4'
+#    moves the m4 builtins into the '_au_' pseudo namespace,
+#  'unm4.m4'
 #    undefines the builtins,
-#  `m4.m4'
+#  'm4.m4'
 #    restores them.
 #
-# So `input.m4' is:
+# So 'input.m4' is:
 #
 #     divert(-1)
 #     changequote([, ])
@@ -991,16 +991,16 @@ exit 0;
 # AC definitions must be disabled in the rest of the file, and enabled
 # inside AU macros.
 #
-# Using `autoconf --trace' it is easy to build the files
+# Using 'autoconf --trace' it is easy to build the files
 #
-#   `ac.m4'
+#   'ac.m4'
 #     define the autoquoting AC fake macros
-#   `disable.m4'
+#   'disable.m4'
 #     undefine the m4sugar and AC autoquoting macros.
-#   `au.m4'
-#     definitions of the AU macros (such as `OLD' above).
+#   'au.m4'
+#     definitions of the AU macros (such as 'OLD' above).
 #
-# Now, `input.m4' is:
+# Now, 'input.m4' is:
 #
 #     divert(-1)
 #     changequote([, ])
diff --git a/bin/ifnames.in b/bin/ifnames.in
index ba2cd05..3069224 100644
--- a/bin/ifnames.in
+++ b/bin/ifnames.in
@@ -51,8 +51,8 @@ $help = "Usage: $0 [OPTION]... [FILE]...
 
 Scan all of the C source FILES (or the standard input, if none are
 given) and write to the standard output a sorted list of all the
-identifiers that appear in those files in `#if', `#elif', `#ifdef', or
-`#ifndef' directives.  Print each identifier on a line, followed by a
+identifiers that appear in those files in '#if', '#elif', '#ifdef', or
+'#ifndef' directives.  Print each identifier on a line, followed by a
 space-separated list of the files in which that identifier occurs.
 
   -h, --help      print this help, then exit
-- 
1.7.12.317.g1c54b74




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