Merge from gnulib

This incorporates:
2015-10-13 binary-io, u64, unistd: port to strict C
2015-09-26 c-ctype: do not worry about EBCDIC + char signed
2015-09-25 c-ctype: port better to z/OS EBCDIC
2015-09-25 gnulib-common.m4: fix gl_PROG_AR_RANLIB/AM_PROG_AR clash
* doc/misc/texinfo.tex, lib/binary-io.c, lib/c-ctype.h, lib/u64.c:
* lib/unistd.c, m4/gnulib-common.m4, m4/gnulib-comp.m4:
Copy from gnulib.

7 files changed, 130 insertions, 502 deletions

diff --git a/doc/misc/texinfo.tex b/doc/misc/texinfo.tex
index bff8eb017a0..46a9d1535df 100644
--- a/doc/misc/texinfo.tex
+++ b/doc/misc/texinfo.tex
@@ -3,7 +3,7 @@
 % Load plain if necessary, i.e., if running under initex.
 \expandafter\ifx\csname fmtname\endcsname\relax\input plain\fi
 %
-\def\texinfoversion{2015-09-20.17}
+\def\texinfoversion{2015-10-09.18}
 %
 % Copyright 1985, 1986, 1988, 1990, 1991, 1992, 1993, 1994, 1995,
 % 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
@@ -530,14 +530,13 @@
 %
 \def\finishparsearg#1 \ArgTerm{\expandafter\argtorun\expandafter{#1}}
 
+
+% \parseargdef - define a command taking an argument on the line
+%
 % \parseargdef\foo{...}
 %       is roughly equivalent to
 % \def\foo{\parsearg\Xfoo}
 % \def\Xfoo#1{...}
-%
-% Actually, I use \csname\string\foo\endcsname, ie. \\foo, as it is my
-% favourite TeX trick.  --kasal, 16nov03
-
 \def\parseargdef#1{%
   \expandafter \doparseargdef \csname\string#1\endcsname #1%
 }
@@ -1416,6 +1415,7 @@ output) for that.)}
       \normalturnoffactive
       \def\@{@}%
       \let\/=\empty
+      \let\xprocessmacroarg=\eatspaces % in case we are in a macro expansion
       \makevalueexpandable
       % do we want to go so far as to use \indexnofonts instead of just
       % special-casing \var here?
@@ -4864,11 +4864,17 @@ end
 \def\requireopenindexfile#1{%
 \ifnum\csname #1indfile\endcsname=0
   \expandafter\newwrite \csname#1indfile\endcsname
-  \immediate\openout\csname#1indfile\endcsname \jobname.#1 % Open the file
+  \edef\suffix{#1}%
+  % A .fls suffix would conflict with the file extension for the output
+  % of -recorder, so use .f1s instead.
+  \ifx\suffix\indexisfl\def\suffix{f1}\fi
+  % Open the file
+  \immediate\openout\csname#1indfile\endcsname \jobname.\suffix
   % Using \immediate here prevents an object entering into the current box,
   % which could confound checks such as those in \safewhatsit for preceding
   % skips.
 \fi}
+\def\indexisfl{fl}
 
 % Output \ as {\indexbackslash}, because \ is an escape character in
 % the index files.
@@ -5059,7 +5065,9 @@ end
   % as its first line, TeX doesn't complain about mismatched braces
   % (because it thinks @} is a control sequence).
   \catcode`\@ = 11
-  \openin 1 \jobname.#1s
+  % See comment in \requireopenindexfile.
+  \def\indexname{#1}\ifx\indexname\indexisfl\def\indexname{f1}\fi
+  \openin 1 \jobname.\indexname s
   \ifeof 1
     % \enddoublecolumns gets confused if there is no text in the index,
     % and it loses the chapter title and the aux file entries for the
@@ -5251,7 +5259,7 @@ end
     % cursed by a Unix daemon.
     \setbox\boxA = \hbox{#1}%
     \ifdim\wd\boxA = 0pt
-      \ %
+      \null\nobreak\hfill\ %
     \else
       %
       \null\nobreak\indexdotfill % Have leaders before the page number.
@@ -5558,7 +5566,8 @@ end
     \writetocentry{part}{#1}{}% but put it in the toc
     \headingsoff              % no headline or footline on the part page
     % This outputs a mark at the end of the page that clears \thischapter
-    % and \thissection, like is done in \startcontents.
+    % and \thissection, as is done in \startcontents.
+    \let\pchapsepmacro\relax
     \chapmacro{}{Yomitfromtoc}{}%
     \chapoddpage
   \endgroup
@@ -9339,7 +9348,8 @@ directory should work if nowhere else does.}
 % @documentencoding sets the definition of non-ASCII characters
 % according to the specified encoding.
 %
-\parseargdef\documentencoding{%
+\def\documentencoding{\parseargusing\filenamecatcodes\documentencodingzzz}
+\def\documentencodingzzz#1{%
   % Encoding being declared for the document.
   \def\declaredencoding{\csname #1.enc\endcsname}%
   %
@@ -10066,6 +10076,9 @@ directory should work if nowhere else does.}
 
   \DeclareUnicodeCharacter{02DB}{\ogonek{ }}
 
+  % Greek letters
+  \DeclareUnicodeCharacter{03C0}{\ensuremath\pi}
+
   \DeclareUnicodeCharacter{1E02}{\dotaccent{B}}
   \DeclareUnicodeCharacter{1E03}{\dotaccent{b}}
   \DeclareUnicodeCharacter{1E04}{\udotaccent{B}}
@@ -10193,6 +10206,7 @@ directory should work if nowhere else does.}
   \DeclareUnicodeCharacter{1EF8}{\~Y}
   \DeclareUnicodeCharacter{1EF9}{\~y}
 
+  % Punctuation
   \DeclareUnicodeCharacter{2013}{--}
   \DeclareUnicodeCharacter{2014}{---}
   \DeclareUnicodeCharacter{2018}{\quoteleft}
@@ -10204,18 +10218,34 @@ directory should work if nowhere else does.}
   \DeclareUnicodeCharacter{2020}{\ensuremath\dagger}
   \DeclareUnicodeCharacter{2021}{\ensuremath\ddagger}
   \DeclareUnicodeCharacter{2022}{\bullet}
+  \DeclareUnicodeCharacter{202F}{\thinspace}
   \DeclareUnicodeCharacter{2026}{\dots}
   \DeclareUnicodeCharacter{2039}{\guilsinglleft}
   \DeclareUnicodeCharacter{203A}{\guilsinglright}
+
   \DeclareUnicodeCharacter{20AC}{\euro}
 
   \DeclareUnicodeCharacter{2192}{\expansion}
   \DeclareUnicodeCharacter{21D2}{\result}
 
+  % Mathematical symbols
+  \DeclareUnicodeCharacter{2200}{\ensuremath\forall}
+  \DeclareUnicodeCharacter{2203}{\ensuremath\exists}
+  \DeclareUnicodeCharacter{2208}{\ensuremath\in}
   \DeclareUnicodeCharacter{2212}{\minus}
   \DeclareUnicodeCharacter{2217}{\point}
+  \DeclareUnicodeCharacter{221E}{\ensuremath\infty}
   \DeclareUnicodeCharacter{2225}{\ensuremath\parallel}
+  \DeclareUnicodeCharacter{2227}{\ensuremath\wedge}
+  \DeclareUnicodeCharacter{2229}{\ensuremath\cap}
   \DeclareUnicodeCharacter{2261}{\equiv}
+  \DeclareUnicodeCharacter{2264}{\ensuremath\leq}
+  \DeclareUnicodeCharacter{2265}{\ensuremath\geq}
+  \DeclareUnicodeCharacter{2282}{\ensuremath\subset}
+  \DeclareUnicodeCharacter{2287}{\ensuremath\supseteq}
+
+  \global\mathchardef\checkmark="1370 % actually the square root sign
+  \DeclareUnicodeCharacter{2713}{\ensuremath\checkmark}
 }% end of \utfeightchardefs
 
 % US-ASCII character definitions.
diff --git a/lib/binary-io.c b/lib/binary-io.c
index 8bbdb44d121..d828bcd0153 100644
--- a/lib/binary-io.c
+++ b/lib/binary-io.c
@@ -1,3 +1,4 @@
 #include <config.h>
 #define BINARY_IO_INLINE _GL_EXTERN_INLINE
 #include "binary-io.h"
+typedef int dummy;
diff --git a/lib/c-ctype.h b/lib/c-ctype.h
index 50ebbb58293..15125308cb6 100644
--- a/lib/c-ctype.h
+++ b/lib/c-ctype.h
@@ -78,82 +78,65 @@ extern "C" {
 # error "Only ASCII and EBCDIC are supported"
 #endif
 
-#define _C_CTYPE_SIGNED_EBCDIC ('A' < 0)
+#if 'A' < 0
+# error "EBCDIC and char is signed -- not supported"
+#endif
+
+/* Cases for control characters.  */
+
+#define _C_CTYPE_CNTRL \
+   case '\a': case '\b': case '\f': case '\n': \
+   case '\r': case '\t': case '\v': \
+   _C_CTYPE_OTHER_CNTRL
+
+/* ASCII control characters other than those with \-letter escapes.  */
 
 #if C_CTYPE_ASCII
-# define _C_CTYPE_CNTRL \
+# define _C_CTYPE_OTHER_CNTRL \
     case '\x00': case '\x01': case '\x02': case '\x03': \
-    case '\x04': case '\x05': case '\x06': case '\x07': \
-    case '\x08': case '\x09': case '\x0a': case '\x0b': \
-    case '\x0c': case '\x0d': case '\x0e': case '\x0f': \
-    case '\x10': case '\x11': case '\x12': case '\x13': \
-    case '\x14': case '\x15': case '\x16': case '\x17': \
-    case '\x18': case '\x19': case '\x1a': case '\x1b': \
-    case '\x1c': case '\x1d': case '\x1e': case '\x1f': \
-    case '\x7f'
+    case '\x04': case '\x05': case '\x06': case '\x0e': \
+    case '\x0f': case '\x10': case '\x11': case '\x12': \
+    case '\x13': case '\x14': case '\x15': case '\x16': \
+    case '\x17': case '\x18': case '\x19': case '\x1a': \
+    case '\x1b': case '\x1c': case '\x1d': case '\x1e': \
+    case '\x1f': case '\x7f'
 #else
    /* Use EBCDIC code page 1047's assignments for ASCII control chars;
       assume all EBCDIC code pages agree about these assignments.  */
-# define _C_CTYPE_CNTRL \
+# define _C_CTYPE_OTHER_CNTRL \
     case '\x00': case '\x01': case '\x02': case '\x03': \
-    case '\x05': case '\x07': case '\x0b': case '\x0c': \
-    case '\x0d': case '\x0e': case '\x0f': case '\x10': \
-    case '\x11': case '\x12': case '\x13': case '\x16': \
-    case '\x18': case '\x19': case '\x1c': case '\x1d': \
-    case '\x1e': case '\x1f': case '\x25': case '\x26': \
-    case '\x27': case '\x2d': case '\x2e': case '\x2f': \
-    case '\x32': case '\x37': case '\x3c': case '\x3d': \
-    case '\x3f'
+    case '\x07': case '\x0e': case '\x0f': case '\x10': \
+    case '\x11': case '\x12': case '\x13': case '\x18': \
+    case '\x19': case '\x1c': case '\x1d': case '\x1e': \
+    case '\x1f': case '\x26': case '\x27': case '\x2d': \
+    case '\x2e': case '\x32': case '\x37': case '\x3c': \
+    case '\x3d': case '\x3f'
 #endif
 
-/* Cases for hex letter digits, digits, lower, and upper, offset by N.  */
+/* Cases for lowercase hex letters, and lowercase letters, all offset by N.  */
 
-#define _C_CTYPE_A_THRU_F_N(n) \
+#define _C_CTYPE_LOWER_A_THRU_F_N(n) \
    case 'a' + (n): case 'b' + (n): case 'c' + (n): case 'd' + (n): \
-   case 'e' + (n): case 'f' + (n): \
-   case 'A' + (n): case 'B' + (n): case 'C' + (n): case 'D' + (n): \
-   case 'E' + (n): case 'F' + (n)
-#define _C_CTYPE_DIGIT_N(n) \
-   case '0' + (n): case '1' + (n): case '2' + (n): case '3' + (n): \
-   case '4' + (n): case '5' + (n): case '6' + (n): case '7' + (n): \
-   case '8' + (n): case '9' + (n)
+   case 'e' + (n): case 'f' + (n)
 #define _C_CTYPE_LOWER_N(n) \
-   case 'a' + (n): case 'b' + (n): case 'c' + (n): case 'd' + (n): \
-   case 'e' + (n): case 'f' + (n): case 'g' + (n): case 'h' + (n): \
-   case 'i' + (n): case 'j' + (n): case 'k' + (n): case 'l' + (n): \
-   case 'm' + (n): case 'n' + (n): case 'o' + (n): case 'p' + (n): \
-   case 'q' + (n): case 'r' + (n): case 's' + (n): case 't' + (n): \
-   case 'u' + (n): case 'v' + (n): case 'w' + (n): case 'x' + (n): \
-   case 'y' + (n): case 'z' + (n)
-#define _C_CTYPE_UPPER_N(n) \
-   case 'A' + (n): case 'B' + (n): case 'C' + (n): case 'D' + (n): \
-   case 'E' + (n): case 'F' + (n): case 'G' + (n): case 'H' + (n): \
-   case 'I' + (n): case 'J' + (n): case 'K' + (n): case 'L' + (n): \
-   case 'M' + (n): case 'N' + (n): case 'O' + (n): case 'P' + (n): \
-   case 'Q' + (n): case 'R' + (n): case 'S' + (n): case 'T' + (n): \
-   case 'U' + (n): case 'V' + (n): case 'W' + (n): case 'X' + (n): \
-   case 'Y' + (n): case 'Z' + (n)
-
-/* Given MACRO_N, expand to all the cases for the corresponding class.  */
-#if _C_CTYPE_SIGNED_EBCDIC
-# define _C_CTYPE_CASES(macro_n) macro_n (0): macro_n (256)
-#else
-# define _C_CTYPE_CASES(macro_n) macro_n (0)
-#endif
-
-/* Cases for hex letter digits, digits, lower, and upper, with another
-   case for unsigned char if the original char is negative.  */
-
-#define _C_CTYPE_A_THRU_F _C_CTYPE_CASES (_C_CTYPE_A_THRU_F_N)
-#define _C_CTYPE_DIGIT _C_CTYPE_CASES (_C_CTYPE_DIGIT_N)
-#define _C_CTYPE_LOWER _C_CTYPE_CASES (_C_CTYPE_LOWER_N)
-#define _C_CTYPE_UPPER _C_CTYPE_CASES (_C_CTYPE_UPPER_N)
-
-/* The punct class differs because some punctuation characters may be
-   negative while others are nonnegative.  Instead of attempting to
-   define _C_CTYPE_PUNCT, define just the plain chars here, and do any
-   cases-plus-256 by hand after using this macro.  */
-#define _C_CTYPE_PUNCT_PLAIN \
+   _C_CTYPE_LOWER_A_THRU_F_N(n): \
+   case 'g' + (n): case 'h' + (n): case 'i' + (n): case 'j' + (n): \
+   case 'k' + (n): case 'l' + (n): case 'm' + (n): case 'n' + (n): \
+   case 'o' + (n): case 'p' + (n): case 'q' + (n): case 'r' + (n): \
+   case 's' + (n): case 't' + (n): case 'u' + (n): case 'v' + (n): \
+   case 'w' + (n): case 'x' + (n): case 'y' + (n): case 'z' + (n)
+
+/* Cases for hex letters, digits, lower, punct, and upper.  */
+
+#define _C_CTYPE_A_THRU_F \
+   _C_CTYPE_LOWER_A_THRU_F_N (0): \
+   _C_CTYPE_LOWER_A_THRU_F_N ('A' - 'a')
+#define _C_CTYPE_DIGIT                     \
+   case '0': case '1': case '2': case '3': \
+   case '4': case '5': case '6': case '7': \
+   case '8': case '9'
+#define _C_CTYPE_LOWER _C_CTYPE_LOWER_N (0)
+#define _C_CTYPE_PUNCT \
    case '!': case '"': case '#': case '$':  \
    case '%': case '&': case '\'': case '(': \
    case ')': case '*': case '+': case ',':  \
@@ -162,6 +145,8 @@ extern "C" {
    case '?': case '@': case '[': case '\\': \
    case ']': case '^': case '_': case '`':  \
    case '{': case '|': case '}': case '~'
+#define _C_CTYPE_UPPER _C_CTYPE_LOWER_N ('A' - 'a')
+
 
 /* Function definitions.  */
 
@@ -189,7 +174,6 @@ c_isalnum (int c)
     _C_CTYPE_LOWER:
     _C_CTYPE_UPPER:
       return true;
-
     default:
       return false;
     }
@@ -203,7 +187,6 @@ c_isalpha (int c)
     _C_CTYPE_LOWER:
     _C_CTYPE_UPPER:
       return true;
-
     default:
       return false;
     }
@@ -220,107 +203,9 @@ c_isascii (int c)
     _C_CTYPE_CNTRL:
     _C_CTYPE_DIGIT:
     _C_CTYPE_LOWER:
+    _C_CTYPE_PUNCT:
     _C_CTYPE_UPPER:
-
-    _C_CTYPE_PUNCT_PLAIN:
-#if '!' < 0
-    case '!' + 256:
-#endif
-#if '"' < 0
-    case '"' + 256:
-#endif
-#if '#' < 0
-    case '#' + 256:
-#endif
-#if '$' < 0
-    case '$' + 256:
-#endif
-#if '%' < 0
-    case '%' + 256:
-#endif
-#if '&' < 0
-    case '&' + 256:
-#endif
-#if '\'' < 0
-    case '\'' + 256:
-#endif
-#if '(' < 0
-    case '(' + 256:
-#endif
-#if ')' < 0
-    case ')' + 256:
-#endif
-#if '*' < 0
-    case '*' + 256:
-#endif
-#if '+' < 0
-    case '+' + 256:
-#endif
-#if ',' < 0
-    case ',' + 256:
-#endif
-#if '-' < 0
-    case '-' + 256:
-#endif
-#if '.' < 0
-    case '.' + 256:
-#endif
-#if '/' < 0
-    case '/' + 256:
-#endif
-#if ':' < 0
-    case ':' + 256:
-#endif
-#if ';' < 0
-    case ';' + 256:
-#endif
-#if '<' < 0
-    case '<' + 256:
-#endif
-#if '=' < 0
-    case '=' + 256:
-#endif
-#if '>' < 0
-    case '>' + 256:
-#endif
-#if '?' < 0
-    case '?' + 256:
-#endif
-#if '@' < 0
-    case '@' + 256:
-#endif
-#if '[' < 0
-    case '[' + 256:
-#endif
-#if '\\' < 0
-    case '\\' + 256:
-#endif
-#if ']' < 0
-    case ']' + 256:
-#endif
-#if '^' < 0
-    case '^' + 256:
-#endif
-#if '_' < 0
-    case '_' + 256:
-#endif
-#if '`' < 0
-    case '`' + 256:
-#endif
-#if '{' < 0
-    case '{' + 256:
-#endif
-#if '|' < 0
-    case '|' + 256:
-#endif
-#if '}' < 0
-    case '}' + 256:
-#endif
-#if '~' < 0
-    case '~' + 256:
-#endif
       return true;
-
     default:
       return false;
     }
@@ -363,107 +248,9 @@ c_isgraph (int c)
     {
     _C_CTYPE_DIGIT:
     _C_CTYPE_LOWER:
+    _C_CTYPE_PUNCT:
     _C_CTYPE_UPPER:
-
-    _C_CTYPE_PUNCT_PLAIN:
-#if '!' < 0
-    case '!' + 256:
-#endif
-#if '"' < 0
-    case '"' + 256:
-#endif
-#if '#' < 0
-    case '#' + 256:
-#endif
-#if '$' < 0
-    case '$' + 256:
-#endif
-#if '%' < 0
-    case '%' + 256:
-#endif
-#if '&' < 0
-    case '&' + 256:
-#endif
-#if '\'' < 0
-    case '\'' + 256:
-#endif
-#if '(' < 0
-    case '(' + 256:
-#endif
-#if ')' < 0
-    case ')' + 256:
-#endif
-#if '*' < 0
-    case '*' + 256:
-#endif
-#if '+' < 0
-    case '+' + 256:
-#endif
-#if ',' < 0
-    case ',' + 256:
-#endif
-#if '-' < 0
-    case '-' + 256:
-#endif
-#if '.' < 0
-    case '.' + 256:
-#endif
-#if '/' < 0
-    case '/' + 256:
-#endif
-#if ':' < 0
-    case ':' + 256:
-#endif
-#if ';' < 0
-    case ';' + 256:
-#endif
-#if '<' < 0
-    case '<' + 256:
-#endif
-#if '=' < 0
-    case '=' + 256:
-#endif
-#if '>' < 0
-    case '>' + 256:
-#endif
-#if '?' < 0
-    case '?' + 256:
-#endif
-#if '@' < 0
-    case '@' + 256:
-#endif
-#if '[' < 0
-    case '[' + 256:
-#endif
-#if '\\' < 0
-    case '\\' + 256:
-#endif
-#if ']' < 0
-    case ']' + 256:
-#endif
-#if '^' < 0
-    case '^' + 256:
-#endif
-#if '_' < 0
-    case '_' + 256:
-#endif
-#if '`' < 0
-    case '`' + 256:
-#endif
-#if '{' < 0
-    case '{' + 256:
-#endif
-#if '|' < 0
-    case '|' + 256:
-#endif
-#if '}' < 0
-    case '}' + 256:
-#endif
-#if '~' < 0
-    case '~' + 256:
-#endif
       return true;
-
     default:
       return false;
     }
@@ -489,107 +276,9 @@ c_isprint (int c)
     case ' ':
     _C_CTYPE_DIGIT:
     _C_CTYPE_LOWER:
+    _C_CTYPE_PUNCT:
     _C_CTYPE_UPPER:
-
-    _C_CTYPE_PUNCT_PLAIN:
-#if '!' < 0
-    case '!' + 256:
-#endif
-#if '"' < 0
-    case '"' + 256:
-#endif
-#if '#' < 0
-    case '#' + 256:
-#endif
-#if '$' < 0
-    case '$' + 256:
-#endif
-#if '%' < 0
-    case '%' + 256:
-#endif
-#if '&' < 0
-    case '&' + 256:
-#endif
-#if '\'' < 0
-    case '\'' + 256:
-#endif
-#if '(' < 0
-    case '(' + 256:
-#endif
-#if ')' < 0
-    case ')' + 256:
-#endif
-#if '*' < 0
-    case '*' + 256:
-#endif
-#if '+' < 0
-    case '+' + 256:
-#endif
-#if ',' < 0
-    case ',' + 256:
-#endif
-#if '-' < 0
-    case '-' + 256:
-#endif
-#if '.' < 0
-    case '.' + 256:
-#endif
-#if '/' < 0
-    case '/' + 256:
-#endif
-#if ':' < 0
-    case ':' + 256:
-#endif
-#if ';' < 0
-    case ';' + 256:
-#endif
-#if '<' < 0
-    case '<' + 256:
-#endif
-#if '=' < 0
-    case '=' + 256:
-#endif
-#if '>' < 0
-    case '>' + 256:
-#endif
-#if '?' < 0
-    case '?' + 256:
-#endif
-#if '@' < 0
-    case '@' + 256:
-#endif
-#if '[' < 0
-    case '[' + 256:
-#endif
-#if '\\' < 0
-    case '\\' + 256:
-#endif
-#if ']' < 0
-    case ']' + 256:
-#endif
-#if '^' < 0
-    case '^' + 256:
-#endif
-#if '_' < 0
-    case '_' + 256:
-#endif
-#if '`' < 0
-    case '`' + 256:
-#endif
-#if '{' < 0
-    case '{' + 256:
-#endif
-#if '|' < 0
-    case '|' + 256:
-#endif
-#if '}' < 0
-    case '}' + 256:
-#endif
-#if '~' < 0
-    case '~' + 256:
-#endif
       return true;
-
     default:
       return false;
     }
@@ -600,105 +289,8 @@ c_ispunct (int c)
 {
   switch (c)
     {
-    _C_CTYPE_PUNCT_PLAIN:
-#if '!' < 0
-    case '!' + 256:
-#endif
-#if '"' < 0
-    case '"' + 256:
-#endif
-#if '#' < 0
-    case '#' + 256:
-#endif
-#if '$' < 0
-    case '$' + 256:
-#endif
-#if '%' < 0
-    case '%' + 256:
-#endif
-#if '&' < 0
-    case '&' + 256:
-#endif
-#if '\'' < 0
-    case '\'' + 256:
-#endif
-#if '(' < 0
-    case '(' + 256:
-#endif
-#if ')' < 0
-    case ')' + 256:
-#endif
-#if '*' < 0
-    case '*' + 256:
-#endif
-#if '+' < 0
-    case '+' + 256:
-#endif
-#if ',' < 0
-    case ',' + 256:
-#endif
-#if '-' < 0
-    case '-' + 256:
-#endif
-#if '.' < 0
-    case '.' + 256:
-#endif
-#if '/' < 0
-    case '/' + 256:
-#endif
-#if ':' < 0
-    case ':' + 256:
-#endif
-#if ';' < 0
-    case ';' + 256:
-#endif
-#if '<' < 0
-    case '<' + 256:
-#endif
-#if '=' < 0
-    case '=' + 256:
-#endif
-#if '>' < 0
-    case '>' + 256:
-#endif
-#if '?' < 0
-    case '?' + 256:
-#endif
-#if '@' < 0
-    case '@' + 256:
-#endif
-#if '[' < 0
-    case '[' + 256:
-#endif
-#if '\\' < 0
-    case '\\' + 256:
-#endif
-#if ']' < 0
-    case ']' + 256:
-#endif
-#if '^' < 0
-    case '^' + 256:
-#endif
-#if '_' < 0
-    case '_' + 256:
-#endif
-#if '`' < 0
-    case '`' + 256:
-#endif
-#if '{' < 0
-    case '{' + 256:
-#endif
-#if '|' < 0
-    case '|' + 256:
-#endif
-#if '}' < 0
-    case '}' + 256:
-#endif
-#if '~' < 0
-    case '~' + 256:
-#endif
+    _C_CTYPE_PUNCT:
       return true;
-
     default:
       return false;
     }
@@ -736,7 +328,6 @@ c_isxdigit (int c)
     _C_CTYPE_DIGIT:
     _C_CTYPE_A_THRU_F:
       return true;
-
     default:
       return false;
     }
@@ -747,14 +338,8 @@ c_tolower (int c)
 {
   switch (c)
     {
-    _C_CTYPE_UPPER_N (0):
-#if _C_CTYPE_SIGNED_EBCDIC
-      c += 256;
-      /* Fall through.  */
-    _C_CTYPE_UPPER_N (256):
-#endif
+    _C_CTYPE_UPPER:
       return c - 'A' + 'a';
-
     default:
       return c;
     }
@@ -765,14 +350,8 @@ c_toupper (int c)
 {
   switch (c)
     {
-    _C_CTYPE_LOWER_N (0):
-#if _C_CTYPE_SIGNED_EBCDIC
-      c += 256;
-      /* Fall through.  */
-    _C_CTYPE_LOWER_N (256):
-#endif
+    _C_CTYPE_LOWER:
       return c - 'a' + 'A';
-
     default:
       return c;
     }
diff --git a/lib/u64.c b/lib/u64.c
index 04cf7a29946..1e3854ddcd7 100644
--- a/lib/u64.c
+++ b/lib/u64.c
@@ -1,3 +1,4 @@
 #include <config.h>
 #define _GL_U64_INLINE _GL_EXTERN_INLINE
 #include "u64.h"
+typedef int dummy;
diff --git a/lib/unistd.c b/lib/unistd.c
index 6c6a8e268c0..72bad1c0527 100644
--- a/lib/unistd.c
+++ b/lib/unistd.c
@@ -1,3 +1,4 @@
 #include <config.h>
 #define _GL_UNISTD_INLINE _GL_EXTERN_INLINE
 #include "unistd.h"
+typedef int dummy;
diff --git a/m4/gnulib-common.m4 b/m4/gnulib-common.m4
index 40e82f6e27f..50ef974205f 100644
--- a/m4/gnulib-common.m4
+++ b/m4/gnulib-common.m4
@@ -253,9 +253,10 @@ AC_DEFUN([gl_PROG_AR_RANLIB],
 [
   dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler
   dnl as "cc", and GCC as "gcc". They have different object file formats and
-  dnl library formats. In particular, the GNU binutils programs ar, ranlib
+  dnl library formats. In particular, the GNU binutils programs ar and ranlib
   dnl produce libraries that work only with gcc, not with cc.
   AC_REQUIRE([AC_PROG_CC])
+  AC_BEFORE([$0], [AM_PROG_AR])
   AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler],
     [
       AC_EGREP_CPP([Amsterdam],
@@ -267,25 +268,37 @@ Amsterdam
         [gl_cv_c_amsterdam_compiler=yes],
         [gl_cv_c_amsterdam_compiler=no])
     ])
-  if test -z "$AR"; then
-    if test $gl_cv_c_amsterdam_compiler = yes; then
+
+  dnl Don't compete with AM_PROG_AR's decision about AR/ARFLAGS if we are not
+  dnl building with __ACK__.
+  if test $gl_cv_c_amsterdam_compiler = yes; then
+    if test -z "$AR"; then
       AR='cc -c.a'
-      if test -z "$ARFLAGS"; then
-        ARFLAGS='-o'
-      fi
-    else
-      dnl Use the Automake-documented default values for AR and ARFLAGS,
-      dnl but prefer ${host}-ar over ar (useful for cross-compiling).
-      AC_CHECK_TOOL([AR], [ar], [ar])
-      if test -z "$ARFLAGS"; then
-        ARFLAGS='cr'
-      fi
     fi
-  else
     if test -z "$ARFLAGS"; then
-      ARFLAGS='cr'
+      ARFLAGS='-o'
     fi
+  else
+    dnl AM_PROG_AR was added in automake v1.11.2.  AM_PROG_AR does not AC_SUBST
+    dnl ARFLAGS variable (it is filed into Makefile.in directly by automake
+    dnl script on-demand, if not specified by ./configure of course).
+    dnl Don't AC_REQUIRE the AM_PROG_AR otherwise the code for __ACK__ above
+    dnl will be ignored.  Also, pay attention to call AM_PROG_AR in else block
+    dnl because AM_PROG_AR is written so it could re-set AR variable even for
+    dnl __ACK__.  It may seem like its easier to avoid calling the macro here,
+    dnl but we need to AC_SUBST both AR/ARFLAGS (thus those must have some good
+    dnl default value and automake should usually know them).
+    m4_ifdef([AM_PROG_AR], [AM_PROG_AR], [:])
+  fi
+
+  dnl In case the code above has not helped with setting AR/ARFLAGS, use
+  dnl Automake-documented default values for AR and ARFLAGS, but prefer
+  dnl ${host}-ar over ar (useful for cross-compiling).
+  AC_CHECK_TOOL([AR], [ar], [ar])
+  if test -z "$ARFLAGS"; then
+    ARFLAGS='cr'
   fi
+
   AC_SUBST([AR])
   AC_SUBST([ARFLAGS])
   if test -z "$RANLIB"; then
diff --git a/m4/gnulib-comp.m4 b/m4/gnulib-comp.m4
index c48d2e5be5c..349c0dce4e2 100644
--- a/m4/gnulib-comp.m4
+++ b/m4/gnulib-comp.m4
@@ -37,7 +37,11 @@ AC_DEFUN([gl_EARLY],
   m4_pattern_allow([^gl_ES$])dnl a valid locale name
   m4_pattern_allow([^gl_LIBOBJS$])dnl a variable
   m4_pattern_allow([^gl_LTLIBOBJS$])dnl a variable
+
+  # Pre-early section.
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
   AC_REQUIRE([gl_PROG_AR_RANLIB])
+
   # Code from module absolute-header:
   # Code from module acl-permissions:
   # Code from module alloca-opt:
@@ -67,7 +71,6 @@ AC_DEFUN([gl_EARLY],
   # Code from module euidaccess:
   # Code from module execinfo:
   # Code from module extensions:
-  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
   # Code from module extern-inline:
   # Code from module faccessat:
   # Code from module fcntl: