Merge from gnulib.

ChangeLog

 2012-07-09  Paul Eggert  <eggert@cs.ucla.edu>
 
+	Merge from gnulib, incorporating:
+	2012-07-09 timespec: mark functions with const attributes
+
 	Rename configure.in to configure.ac (Bug#11603).
 	The name 'configure.in' has been obsolescent for quite some time,
 	and the next release of Autoconf will generate warnings for it.

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{2012-06-05.14}
+\def\texinfoversion{2012-07-03.16}
 %
 % Copyright 1985, 1986, 1988, 1990, 1991, 1992, 1993, 1994, 1995,
 % 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
@@ -4206,7 +4206,7 @@
 }
 \def\ifsetfail{\doignore{ifset}}
 
-% @ifclear VAR ... @end ifclear reads the `...' iff VAR has never been
+% @ifclear VAR ... @end executes the `...' iff VAR has never been
 % defined with @set, or has been undefined with @clear.
 %
 % The `\else' inside the `\doifset' parameter is a trick to reuse the
@@ -4217,6 +4217,35 @@
 \def\ifclear{\parsearg{\doifset{\else \let\next=\ifclearfail}}}
 \def\ifclearfail{\doignore{ifclear}}
 
+% @ifcommandisdefined CMD ... @end executes the `...' if CMD (written
+% without the @) is in fact defined.  We can only feasibly check at the
+% TeX level, so something like `mathcode' is going to considered
+% defined even though it is not a Texinfo command.
+% 
+\makecond{ifcommanddefined}
+\def\ifcommanddefined{\parsearg{\doifcmddefined{\let\next=\ifcmddefinedfail}}}
+%
+\def\doifcmddefined#1#2{{%
+    \makevalueexpandable
+    \let\next=\empty
+    \expandafter\ifx\csname #2\endcsname\relax
+      #1% If not defined, \let\next as above.
+    \fi
+    \expandafter
+  }\next
+}
+\def\ifcmddefinedfail{\doignore{ifcommanddefined}}
+
+% @ifcommandnotdefined CMD ... handlded similar to @ifclear above.
+\makecond{ifcommandnotdefined}
+\def\ifcommandnotdefined{%
+  \parsearg{\doifcmddefined{\else \let\next=\ifcmdnotdefinedfail}}}
+\def\ifcmdnotdefinedfail{\doignore{ifcommandnotdefined}}
+
+% Set the `txicommandconditionals' variable, so documents have a way to
+% test if the @ifcommand...defined conditionals are available.
+\set txicommandconditionals
+
 % @dircategory CATEGORY  -- specify a category of the dir file
 % which this file should belong to.  Ignore this in TeX.
 \let\dircategory=\comment

lib/getloadavg.c

@@ -28,7 +28,7 @@
                                 macro that comes with autoconf 2.13 or newer.
                                 If that isn't an option, then just put
                                 AC_CHECK_FUNCS(pstat_getdynamic) in your
-                                configure.in file.
+                                configure.ac file.
    HAVE_LIBPERFSTAT Define this if your system has the
                                 perfstat_cpu_total function in libperfstat (AIX).
    FIXUP_KERNEL_SYMBOL_ADDR()   Adjust address in returned struct nlist.

lib/timespec.h

@@ -65,9 +65,12 @@ timespec_sign (struct timespec a)
   return a.tv_sec < 0 ? -1 : a.tv_sec || a.tv_nsec;
 }
 
-struct timespec timespec_add (struct timespec, struct timespec);
-struct timespec timespec_sub (struct timespec, struct timespec);
-struct timespec dtotimespec (double);
+struct timespec timespec_add (struct timespec, struct timespec)
+  _GL_ATTRIBUTE_CONST;
+struct timespec timespec_sub (struct timespec, struct timespec)
+  _GL_ATTRIBUTE_CONST;
+struct timespec dtotimespec (double)
+  _GL_ATTRIBUTE_CONST;
 
 /* Return an approximation to A, of type 'double'.  */
 static inline double

m4/getopt.m4

@@ -38,7 +38,6 @@ AC_DEFUN([gl_FUNC_GETOPT_GNU],
   AC_REQUIRE([gl_FUNC_GETOPT_POSIX])
 ])
 
-# emacs' configure.in uses this.
 AC_DEFUN([gl_GETOPT_IFELSE],
 [
   AC_REQUIRE([gl_GETOPT_CHECK_HEADERS])
@@ -360,7 +359,6 @@ dnl is ambiguous with environment values that contain newlines.
   fi
 ])
 
-# emacs' configure.in uses this.
 AC_DEFUN([gl_GETOPT_SUBSTITUTE_HEADER],
 [
   GETOPT_H=getopt.h
@@ -371,7 +369,6 @@ AC_DEFUN([gl_GETOPT_SUBSTITUTE_HEADER],
 ])
 
 # Prerequisites of lib/getopt*.
-# emacs' configure.in uses this.
 AC_DEFUN([gl_PREREQ_GETOPT],
 [
   AC_CHECK_DECLS_ONCE([getenv])

m4/gnulib-comp.m4

@@ -28,7 +28,7 @@
 # other built files.
 
 
-# This macro should be invoked from ./configure.in, in the section
+# This macro should be invoked from ./configure.ac, in the section
 # "Checks for programs", right after AC_PROG_CC, and certainly before
 # any checks for libraries, header files, types and library functions.
 AC_DEFUN([gl_EARLY],
@@ -118,7 +118,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module warnings:
 ])
 
-# This macro should be invoked from ./configure.in, in the section
+# This macro should be invoked from ./configure.ac, in the section
 # "Check for header files, types and library functions".
 AC_DEFUN([gl_INIT],
 [