m4: do not quote `like this', as per GCS recommendation

This patch converts the files comprising the automake's own build
system to the use of new quoting format 'like this' or "like this"
rather than `like this'.

* m4/auxdir.m4, m4/ccstdc.m4, m4/depend.m4, m4/depout.m4, m4/tar.m4,
m4/init.m4, m4/maintainer.m4, m4/make.m4, m4/missing.m4, m4/vala.m4,
m4/mkdirp.m4, m4/sanity.m4, m4/silent.m4, m4/strip.m4: Update and
adjust quoting format throughout, in comments and diagnostic.  Some
minor related rewordings and reformatting since we are at it.  Bump
serial numbers.

14 files changed, 52 insertions, 52 deletions

diff --git a/m4/auxdir.m4 b/m4/auxdir.m4
index 50527c4b4..3dda02b26 100644
--- a/m4/auxdir.m4
+++ b/m4/auxdir.m4
@@ -6,11 +6,11 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 1
+# serial 2
 
 # For projects using AC_CONFIG_AUX_DIR([foo]), Autoconf sets
-# $ac_aux_dir to `$srcdir/foo'.  In other projects, it is set to
-# `$srcdir', `$srcdir/..', or `$srcdir/../..'.
+# $ac_aux_dir to '$srcdir/foo'.  In other projects, it is set to
+# '$srcdir', '$srcdir/..', or '$srcdir/../..'.
 #
 # Of course, Automake must honor this variable whenever it calls a
 # tool from the auxiliary directory.  The problem is that $srcdir (and
@@ -29,7 +29,7 @@
 #
 # The reason of the latter failure is that $top_srcdir and $ac_aux_dir
 # are both prefixed by $srcdir.  In an in-source build this is usually
-# harmless because $srcdir is `.', but things will broke when you
+# harmless because $srcdir is '.', but things will broke when you
 # start a VPATH build or use an absolute $srcdir.
 #
 # So we could use something similar to $top_srcdir/$ac_aux_dir/missing,
diff --git a/m4/ccstdc.m4 b/m4/ccstdc.m4
index 9a7a900d0..d57f0554a 100644
--- a/m4/ccstdc.m4
+++ b/m4/ccstdc.m4
@@ -9,15 +9,15 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 4
+# serial 5
 
 # This was merged into AC_PROG_CC in Autoconf.
 
 AU_DEFUN([AM_PROG_CC_STDC],
 [AC_PROG_CC
 AC_DIAGNOSE([obsolete], [$0:
-	your code should no longer depend upon `am_cv_prog_cc_stdc', but upon
-	`ac_cv_prog_cc_stdc'.  Remove this warning and the assignment when
+	your code should no longer depend upon 'am_cv_prog_cc_stdc', but upon
+	'ac_cv_prog_cc_stdc'.  Remove this warning and the assignment when
 	you adjust the code.  You can also remove the above call to
 	AC_PROG_CC if you already called it elsewhere.])
 am_cv_prog_cc_stdc=$ac_cv_prog_cc_stdc
diff --git a/m4/depend.m4 b/m4/depend.m4
index 42392b933..9fbf438e1 100644
--- a/m4/depend.m4
+++ b/m4/depend.m4
@@ -5,9 +5,9 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 14
+# serial 15
 
-# There are a few dirty hacks below to avoid letting `AC_PROG_CC' be
+# There are a few dirty hacks below to avoid letting 'AC_PROG_CC' be
 # written in clear, in which case automake, when reading aclocal.m4,
 # will think it sees a *use*, and therefore will trigger all it's
 # C support machinery.  Also note that it means that autoscan, seeing
@@ -43,8 +43,8 @@ AC_CACHE_CHECK([dependency style of $depcc],
   # We make a subdir and do the tests there.  Otherwise we can end up
   # making bogus files that we don't know about and never remove.  For
   # instance it was reported that on HP-UX the gcc test will end up
-  # making a dummy file named `D' -- because `-MD' means `put the output
-  # in D'.
+  # making a dummy file named 'D' -- because '-MD' means "put the output
+  # in D".
   rm -rf conftest.dir
   mkdir conftest.dir
   # Copy depcomp to subdir because otherwise we won't find it if we're
@@ -84,15 +84,15 @@ AC_CACHE_CHECK([dependency style of $depcc],
     : > sub/conftest.c
     for i in 1 2 3 4 5 6; do
       echo '#include "conftst'$i'.h"' >> sub/conftest.c
-      # Using `: > sub/conftst$i.h' creates only sub/conftst1.h with
+      # Using ": > sub/conftst$i.h" creates only sub/conftst1.h with
       # Solaris 8's {/usr,}/bin/sh.
       touch sub/conftst$i.h
     done
     echo "${am__include} ${am__quote}sub/conftest.Po${am__quote}" > confmf
 
-    # We check with `-c' and `-o' for the sake of the "dashmstdout"
+    # We check with '-c' and '-o' for the sake of the "dashmstdout"
     # mode.  It turns out that the SunPro C++ compiler does not properly
-    # handle `-M -o', and we need to detect this.  Also, some Intel
+    # handle '-M -o', and we need to detect this.  Also, some Intel
     # versions had trouble with output in subdirs
     am__obj=sub/conftest.${OBJEXT-o}
     am__minus_obj="-o $am__obj"
@@ -111,7 +111,7 @@ AC_CACHE_CHECK([dependency style of $depcc],
       fi
       ;;
     msvc7 | msvc7msys | msvisualcpp | msvcmsys)
-      # This compiler won't grok `-c -o', but also, the minuso test has
+      # This compiler won't grok '-c -o', but also, the minuso test has
       # not run yet.  These depmodes are late enough in the game, and
       # so weak that their functioning should not be impacted.
       am__obj=conftest.${OBJEXT-o}
diff --git a/m4/depout.m4 b/m4/depout.m4
index 1ab57c89f..749e592df 100644
--- a/m4/depout.m4
+++ b/m4/depout.m4
@@ -6,7 +6,7 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-#serial 5
+# serial 6
 
 # _AM_OUTPUT_DEPENDENCY_COMMANDS
 # ------------------------------
@@ -25,7 +25,7 @@ AC_DEFUN([_AM_OUTPUT_DEPENDENCY_COMMANDS],
     # Strip MF so we end up with the name of the file.
     mf=`echo "$mf" | sed -e 's/:.*$//'`
     # Check whether this is an Automake generated Makefile or not.
-    # We used to match only the files named `Makefile.in', but
+    # We used to match only the files named 'Makefile.in', but
     # some people rename them; so instead we look at the file content.
     # Grep'ing the first line is not enough: some people post-process
     # each Makefile.in and add a new line on top of each file to say so.
@@ -37,7 +37,7 @@ AC_DEFUN([_AM_OUTPUT_DEPENDENCY_COMMANDS],
       continue
     fi
     # Extract the definition of DEPDIR, am__include, and am__quote
-    # from the Makefile without running `make'.
+    # from the Makefile without running 'make'.
     DEPDIR=`sed -n 's/^DEPDIR = //p' < "$mf"`
     test -z "$DEPDIR" && continue
     am__include=`sed -n 's/^am__include = //p' < "$mf"`
@@ -67,7 +67,7 @@ AC_DEFUN([_AM_OUTPUT_DEPENDENCY_COMMANDS],
 # This macro should only be invoked once -- use via AC_REQUIRE.
 #
 # This code is only required when automatic dependency tracking
-# is enabled.  FIXME.  This creates each `.P' file that we will
+# is enabled.  FIXME.  This creates each '.P' file that we will
 # need in order to bootstrap the dependency handling code.
 AC_DEFUN([AM_OUTPUT_DEPENDENCY_COMMANDS],
 [AC_CONFIG_COMMANDS([depfiles],
diff --git a/m4/init.m4 b/m4/init.m4
index 96f72dd0f..6a6924465 100644
--- a/m4/init.m4
+++ b/m4/init.m4
@@ -6,7 +6,7 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 17
+# serial 18
 
 # This macro actually does too much.  Some checks are only needed if
 # your package does certain things.  But this isn't really a big deal.
@@ -102,15 +102,15 @@ AC_PROVIDE_IFELSE([AC_PROG_OBJC],
 			  defn([AC_PROG_OBJC])[_AM_DEPENDENCIES([OBJC])])])dnl
 ])
 _AM_IF_OPTION([silent-rules], [AC_REQUIRE([AM_SILENT_RULES])])dnl
-dnl The `parallel-tests' driver may need to know about EXEEXT, so add the
-dnl `am__EXEEXT' conditional if _AM_COMPILER_EXEEXT was seen.  This macro
+dnl The 'parallel-tests' driver may need to know about EXEEXT, so add the
+dnl 'am__EXEEXT' conditional if _AM_COMPILER_EXEEXT was seen.  This macro
 dnl is hooked onto _AC_COMPILER_EXEEXT early, see below.
 AC_CONFIG_COMMANDS_PRE(dnl
 [m4_provide_if([_AM_COMPILER_EXEEXT],
   [AM_CONDITIONAL([am__EXEEXT], [test -n "$EXEEXT"])])])dnl
 ])
 
-dnl Hook into `_AC_COMPILER_EXEEXT' early to learn its expansion.  Do not
+dnl Hook into '_AC_COMPILER_EXEEXT' early to learn its expansion.  Do not
 dnl add the conditional right here, as _AC_COMPILER_EXEEXT may be further
 dnl mangled by Autoconf and run in a shell conditional statement.
 m4_define([_AC_COMPILER_EXEEXT],
diff --git a/m4/maintainer.m4 b/m4/maintainer.m4
index f342edfa8..a8f39a343 100644
--- a/m4/maintainer.m4
+++ b/m4/maintainer.m4
@@ -7,13 +7,13 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 6
+# serial 7
 
 # AM_MAINTAINER_MODE([DEFAULT-MODE])
 # ----------------------------------
 # Control maintainer-specific portions of Makefiles.
-# Default is to disable them, unless `enable' is passed literally.
-# For symmetry, `disable' may be passed as well.  Anyway, the user
+# Default is to disable them, unless 'enable' is passed literally.
+# For symmetry, 'disable' may be passed as well.  Anyway, the user
 # can override the default with the --enable/--disable switch.
 AC_DEFUN([AM_MAINTAINER_MODE],
 [m4_case(m4_default([$1], [disable]),
diff --git a/m4/make.m4 b/m4/make.m4
index 2ef95ab7e..c4ba1a6d0 100644
--- a/m4/make.m4
+++ b/m4/make.m4
@@ -6,7 +6,7 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 4
+# serial 5
 
 # AM_MAKE_INCLUDE()
 # -----------------
@@ -25,7 +25,7 @@ am__quote=
 _am_result=none
 # First try GNU make style include.
 echo "include confinc" > confmf
-# Ignore all kinds of additional output from `make'.
+# Ignore all kinds of additional output from 'make'.
 case `$am_make -s -f confmf 2> /dev/null` in #(
 *the\ am__doit\ target*)
   am__include=include
diff --git a/m4/missing.m4 b/m4/missing.m4
index e8ff1766c..e12480334 100644
--- a/m4/missing.m4
+++ b/m4/missing.m4
@@ -6,7 +6,7 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 6
+# serial 7
 
 # AM_MISSING_PROG(NAME, PROGRAM)
 # ------------------------------
@@ -36,6 +36,6 @@ if eval "$MISSING --run true"; then
   am_missing_run="$MISSING --run "
 else
   am_missing_run=
-  AC_MSG_WARN([`missing' script is too old or missing])
+  AC_MSG_WARN(['missing' script is too old or missing])
 fi
 ])
diff --git a/m4/mkdirp.m4 b/m4/mkdirp.m4
index 6265bb049..2d88b92a7 100644
--- a/m4/mkdirp.m4
+++ b/m4/mkdirp.m4
@@ -5,11 +5,11 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 1
+# serial 2
 
 # AM_PROG_MKDIR_P
 # ---------------
-# Check for `mkdir -p'.
+# Check for 'mkdir -p'.
 AC_DEFUN([AM_PROG_MKDIR_P],
 [AC_PREREQ([2.60])dnl
 AC_REQUIRE([AC_PROG_MKDIR_P])dnl
diff --git a/m4/sanity.m4 b/m4/sanity.m4
index bbd5fb5d0..c90bc9809 100644
--- a/m4/sanity.m4
+++ b/m4/sanity.m4
@@ -22,10 +22,10 @@ case `pwd` in
 esac
 case $srcdir in
   *[[\\\"\#\$\&\'\`$am_lf\ \	]]*)
-    AC_MSG_ERROR([unsafe srcdir value: `$srcdir']);;
+    AC_MSG_ERROR([unsafe srcdir value: '$srcdir']);;
 esac
 
-# Do `set' in a subshell so we don't clobber the current shell's
+# Do 'set' in a subshell so we don't clobber the current shell's
 # arguments.  Must try -L first in case configure is actually a
 # symlink; some systems play weird games with the mod time of symlinks
 # (eg FreeBSD returns the mod time of the symlink's containing
diff --git a/m4/silent.m4 b/m4/silent.m4
index ee2b41cbe..d499ecb65 100644
--- a/m4/silent.m4
+++ b/m4/silent.m4
@@ -5,20 +5,20 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 2
+# serial 3
 
 # AM_SILENT_RULES([DEFAULT])
 # --------------------------
 # Enable less verbose build rules; with the default set to DEFAULT
-# (`yes' being less verbose, `no' or empty being verbose).
+# ("yes" being less verbose, "no" or empty being verbose).
 AC_DEFUN([AM_SILENT_RULES],
 [AC_ARG_ENABLE([silent-rules], [dnl
 AS_HELP_STRING(
   [--enable-silent-rules],
-  [less verbose build output (undo: `make V=1')])
+  [less verbose build output (undo: "make V=1")])
 AS_HELP_STRING(
   [--disable-silent-rules],
-  [verbose build output (undo: `make V=0')])dnl
+  [verbose build output (undo: "make V=0")])dnl
 ])
 case $enable_silent_rules in @%:@ (((
   yes) AM_DEFAULT_VERBOSITY=0;;
@@ -26,7 +26,7 @@ case $enable_silent_rules in @%:@ (((
     *) AM_DEFAULT_VERBOSITY=m4_if([$1], [yes], [0], [1]);;
 esac
 dnl
-dnl A few `make' implementations (e.g., NonStop OS and NextStep)
+dnl A few 'make' implementations (e.g., NonStop OS and NextStep)
 dnl do not support nested variable expansions.
 dnl See automake bug#9928 and bug#10237.
 am_make=${MAKE-make}
@@ -44,7 +44,7 @@ else
   am_cv_make_support_nested_variables=no
 fi])
 if test $am_cv_make_support_nested_variables = yes; then
-  dnl Using `$V' instead of `$(V)' breaks IRIX make.
+  dnl Using '$V' instead of '$(V)' breaks IRIX make.
   AM_V='$(V)'
   AM_DEFAULT_V='$(AM_DEFAULT_VERBOSITY)'
 else
diff --git a/m4/strip.m4 b/m4/strip.m4
index 7dfeb0099..42833ca09 100644
--- a/m4/strip.m4
+++ b/m4/strip.m4
@@ -5,24 +5,24 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 1
+# serial 2
 
 # AM_PROG_INSTALL_STRIP
 # ---------------------
-# One issue with vendor `install' (even GNU) is that you can't
+# One issue with vendor 'install' (even GNU) is that you can't
 # specify the program used to strip binaries.  This is especially
 # annoying in cross-compiling environments, where the build's strip
 # is unlikely to handle the host's binaries.
 # Fortunately install-sh will honor a STRIPPROG variable, so we
-# always use install-sh in `make install-strip', and initialize
+# always use install-sh in "make install-strip", and initialize
 # STRIPPROG with the value of the STRIP variable (set by the user).
 AC_DEFUN([AM_PROG_INSTALL_STRIP],
 [AC_REQUIRE([AM_PROG_INSTALL_SH])dnl
-# Installed binaries are usually stripped using `strip' when the user
-# run `make install-strip'.  However `strip' might not be the right
+# Installed binaries are usually stripped using 'strip' when the user
+# run "make install-strip".  However 'strip' might not be the right
 # tool to use in cross-compilation environments, therefore Automake
-# will honor the `STRIP' environment variable to overrule this program.
-dnl Don't test for $cross_compiling = yes, because it might be `maybe'.
+# will honor the 'STRIP' environment variable to overrule this program.
+dnl Don't test for $cross_compiling = yes, because it might be 'maybe'.
 if test "$cross_compiling" != no; then
   AC_CHECK_TOOL([STRIP], [strip], :)
 fi
diff --git a/m4/tar.m4 b/m4/tar.m4
index 066d4650e..244c7295a 100644
--- a/m4/tar.m4
+++ b/m4/tar.m4
@@ -6,12 +6,12 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 2
+# serial 3
 
 # _AM_PROG_TAR(FORMAT)
 # --------------------
 # Check how to create a tarball in format FORMAT.
-# FORMAT should be one of `v7', `ustar', or `pax'.
+# FORMAT should be one of 'v7', 'ustar', or 'pax'.
 #
 # Substitute a variable $(am__tar) that is a command
 # writing to stdout a FORMAT-tarball containing the directory
@@ -34,7 +34,7 @@ AC_MSG_CHECKING([how to create a $1 tar archive])
 _am_tools='gnutar m4_if([$1], [ustar], [plaintar]) pax cpio none'
 _am_tools=${am_cv_prog_tar_$1-$_am_tools}
 # Do not fold the above two line into one, because Tru64 sh and
-# Solaris sh will not grok spaces in the rhs of `-'.
+# Solaris sh will not grok spaces in the rhs of '-'.
 for _am_tool in $_am_tools
 do
   case $_am_tool in
diff --git a/m4/vala.m4 b/m4/vala.m4
index 89a4ae9b9..ea7e5f790 100644
--- a/m4/vala.m4
+++ b/m4/vala.m4
@@ -6,9 +6,9 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# serial 4
+# serial 5
 
-# Check whether the Vala compiler exists in `PATH'. If it is found, the
+# Check whether the Vala compiler exists in $PATH. If it is found, the
 # variable VALAC is set. Optionally a minimum release number of the
 # compiler can be requested.
 #