Use Gnulib's `lib-symbol-versions' module.

* m4/gnulib-cache.m4: Add `lib-symbol-versions'.

lib/Makefile.am

@@ -9,7 +9,7 @@
 # the same distribution terms as the rest of that program.
 #
 # Generated by gnulib-tool.
-# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --lgpl --libtool --macro-prefix=gl --no-vc-files alloca-opt autobuild byteswap canonicalize-lgpl count-one-bits environ extensions flock fpieee full-read full-write havelib iconv_open-utf lib-symbol-visibility libunistring putenv stdlib strcase strftime striconveh string verify vsnprintf
+# Reproduce by: gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --lgpl --libtool --macro-prefix=gl --no-vc-files alloca-opt autobuild byteswap canonicalize-lgpl count-one-bits environ extensions flock fpieee full-read full-write havelib iconv_open-utf lib-symbol-versions lib-symbol-visibility libunistring putenv stdlib strcase strftime striconveh string verify vsnprintf
 
 AUTOMAKE_OPTIONS = 1.5 gnits subdir-objects
 
@@ -896,6 +896,7 @@ time.h: time.in.h
 	      -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
 	      -e 's|@NEXT_TIME_H''@|$(NEXT_TIME_H)|g' \
 	      -e 's|@REPLACE_LOCALTIME_R''@|$(REPLACE_LOCALTIME_R)|g' \
+	      -e 's|@REPLACE_MKTIME''@|$(REPLACE_MKTIME)|g' \
 	      -e 's|@REPLACE_NANOSLEEP''@|$(REPLACE_NANOSLEEP)|g' \
 	      -e 's|@REPLACE_STRPTIME''@|$(REPLACE_STRPTIME)|g' \
 	      -e 's|@REPLACE_TIMEGM''@|$(REPLACE_TIMEGM)|g' \
@@ -972,6 +973,7 @@ unistd.h: unistd.in.h
 	      -e 's|@''HAVE_SYS_PARAM_H''@|$(HAVE_SYS_PARAM_H)|g' \
 	      -e 's|@''REPLACE_CHOWN''@|$(REPLACE_CHOWN)|g' \
 	      -e 's|@''REPLACE_CLOSE''@|$(REPLACE_CLOSE)|g' \
+	      -e 's|@''REPLACE_DUP2''@|$(REPLACE_DUP2)|g' \
 	      -e 's|@''REPLACE_FCHDIR''@|$(REPLACE_FCHDIR)|g' \
 	      -e 's|@''REPLACE_GETCWD''@|$(REPLACE_GETCWD)|g' \
 	      -e 's|@''REPLACE_GETPAGESIZE''@|$(REPLACE_GETPAGESIZE)|g' \

lib/time.in.h

@@ -1,6 +1,6 @@
 /* A more-standard <time.h>.
 
-   Copyright (C) 2007-2008 Free Software Foundation, Inc.
+   Copyright (C) 2007-2009 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
@@ -66,6 +66,12 @@ struct timespec
 int nanosleep (struct timespec const *__rqtp, struct timespec *__rmtp);
 # endif
 
+/* Return the 'time_t' representation of TP and normalize TP.  */
+# if @REPLACE_MKTIME@
+#  define mktime rpl_mktime
+extern time_t mktime (struct tm *__tp);
+# endif
+
 /* Convert TIMER to RESULT, assuming local time and UTC respectively.  See
    <http://www.opengroup.org/susv3xsh/localtime_r.html> and
    <http://www.opengroup.org/susv3xsh/gmtime_r.html>.  */

lib/unistd.in.h

@@ -150,10 +150,13 @@ extern int close (int);
 
 
 #if @GNULIB_DUP2@
-# if !@HAVE_DUP2@
+# if @REPLACE_DUP2@
+#  define dup2 rpl_dup2
+# endif
+# if !@HAVE_DUP2@ || @REPLACE_DUP2@
 /* Copy the file descriptor OLDFD into file descriptor NEWFD.  Do nothing if
    NEWFD = OLDFD, otherwise close NEWFD first if it is open.
-   Return 0 if successful, otherwise -1 and errno set.
+   Return newfd if successful, otherwise -1 and errno set.
    See the POSIX:2001 specification
    <http://www.opengroup.org/susv3xsh/dup2.html>.  */
 extern int dup2 (int oldfd, int newfd);
@@ -214,7 +217,11 @@ extern int fchdir (int /*fd*/);
 
 #  define dup rpl_dup
 extern int dup (int);
-#  define dup2 rpl_dup2
+
+#  if @REPLACE_DUP2@
+#   undef dup2
+#  endif
+#  define dup2 rpl_dup2_fchdir
 extern int dup2 (int, int);
 
 # endif

m4/gnulib-cache.m4

@@ -15,7 +15,7 @@
 
 
 # Specification in the form of a command-line invocation:
-#   gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --lgpl --libtool --macro-prefix=gl --no-vc-files alloca-opt autobuild byteswap canonicalize-lgpl count-one-bits environ extensions flock fpieee full-read full-write havelib iconv_open-utf lib-symbol-visibility libunistring putenv stdlib strcase strftime striconveh string verify vsnprintf
+#   gnulib-tool --import --dir=. --lib=libgnu --source-base=lib --m4-base=m4 --doc-base=doc --tests-base=tests --aux-dir=build-aux --lgpl --libtool --macro-prefix=gl --no-vc-files alloca-opt autobuild byteswap canonicalize-lgpl count-one-bits environ extensions flock fpieee full-read full-write havelib iconv_open-utf lib-symbol-versions lib-symbol-visibility libunistring putenv stdlib strcase strftime striconveh string verify vsnprintf
 
 # Specification in the form of a few gnulib-tool.m4 macro invocations:
 gl_LOCAL_DIR([])
@@ -33,6 +33,7 @@ gl_MODULES([
   full-write
   havelib
   iconv_open-utf
+  lib-symbol-versions
   lib-symbol-visibility
   libunistring
   putenv

m4/gnulib-comp.m4

@@ -15,7 +15,7 @@
 # In projects using CVS, this file can be treated like 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],
@@ -31,7 +31,7 @@ AC_DEFUN([gl_EARLY],
   AC_REQUIRE([gl_FP_IEEE])
 ])
 
-# 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],
 [
@@ -62,6 +62,7 @@ AC_DEFUN([gl_INIT],
   gl_FUNC_ICONV_OPEN
   gl_FUNC_ICONV_OPEN_UTF
   gl_INLINE
+  gl_LD_VERSION_SCRIPT
   gl_VISIBILITY
   gl_LIBUNISTRING
   gl_LOCALCHARSET
@@ -361,6 +362,7 @@ AC_DEFUN([gl_FILE_LIST], [
   m4/inline.m4
   m4/intmax_t.m4
   m4/inttypes_h.m4
+  m4/ld-version-script.m4
   m4/lib-ld.m4
   m4/lib-link.m4
   m4/lib-prefix.m4

m4/iconv.m4

@@ -1,4 +1,4 @@
-# iconv.m4 serial AM7 (gettext-0.18)
+# iconv.m4 serial AM8 (gettext-0.18)
 dnl Copyright (C) 2000-2002, 2007-2009 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -172,8 +172,8 @@ size_t iconv();
 ], [], [am_cv_proto_iconv_arg1=""], [am_cv_proto_iconv_arg1="const"])
       am_cv_proto_iconv="extern size_t iconv (iconv_t cd, $am_cv_proto_iconv_arg1 char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);"])
     am_cv_proto_iconv=`echo "[$]am_cv_proto_iconv" | tr -s ' ' | sed -e 's/( /(/'`
-    AC_MSG_RESULT([${ac_t:-
-         }$am_cv_proto_iconv])
+    AC_MSG_RESULT([
+         $am_cv_proto_iconv])
     AC_DEFINE_UNQUOTED([ICONV_CONST], [$am_cv_proto_iconv_arg1],
       [Define as const if the declaration of iconv() needs const.])
   fi

m4/ld-version-script.m4

@@ -0,0 +1,44 @@
+# ld-version-script.m4 serial 1
+dnl Copyright (C) 2008, 2009 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Simon Josefsson
+
+# FIXME: The test below returns a false positive for mingw
+# cross-compiles, 'local:' statements does not reduce number of
+# exported symbols in a DLL.  Use --disable-ld-version-script to work
+# around the problem.
+
+# gl_LD_VERSION_SCRIPT
+# --------------------
+# Check if LD supports linker scripts, and define automake conditional
+# HAVE_LD_VERSION_SCRIPT if so.
+AC_DEFUN([gl_LD_VERSION_SCRIPT],
+[
+  AC_ARG_ENABLE([ld-version-script],
+    AS_HELP_STRING([--enable-ld-version-script],
+      [enable linker version script (default is enabled when possible)]),
+      [have_ld_version_script=$enableval], [])
+  if test -z "$have_ld_version_script"; then
+    AC_MSG_CHECKING([if LD -Wl,--version-script works])
+    save_LDFLAGS="$LDFLAGS"
+    LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
+    cat > conftest.map <<EOF
+VERS_1 {
+	global: sym;
+};
+
+VERS_2 {
+        global: sym;
+} VERS_1;
+EOF
+    AC_LINK_IFELSE(AC_LANG_PROGRAM([], []),
+                   [have_ld_version_script=yes], [have_ld_version_script=no])
+    rm -f conftest.map
+    LDFLAGS="$save_LDFLAGS"
+    AC_MSG_RESULT($have_ld_version_script)
+  fi
+  AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")
+])

m4/time_h.m4

@@ -1,7 +1,6 @@
 # Configure a more-standard replacement for <time.h>.
 
-# Copyright (C) 2000, 2001, 2003, 2004, 2005, 2006, 2007 Free Software
-# Foundation, Inc.
+# Copyright (C) 2000-2001, 2003-2007, 2009 Free Software Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -30,6 +29,7 @@ AC_DEFUN([gl_HEADER_TIME_H_DEFAULTS],
   dnl Otherwise, replace only if someone compiles with -DGNULIB_PORTCHECK;
   dnl this lets maintainers check for portability.
   REPLACE_LOCALTIME_R=GNULIB_PORTCHECK;  AC_SUBST([REPLACE_LOCALTIME_R])
+  REPLACE_MKTIME=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_MKTIME])
   REPLACE_NANOSLEEP=GNULIB_PORTCHECK;    AC_SUBST([REPLACE_NANOSLEEP])
   REPLACE_STRPTIME=GNULIB_PORTCHECK;     AC_SUBST([REPLACE_STRPTIME])
   REPLACE_TIMEGM=GNULIB_PORTCHECK;       AC_SUBST([REPLACE_TIMEGM])

m4/unistd_h.m4

@@ -1,4 +1,4 @@
-# unistd_h.m4 serial 17
+# unistd_h.m4 serial 18
 dnl Copyright (C) 2006-2009 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -73,6 +73,7 @@ AC_DEFUN([gl_UNISTD_H_DEFAULTS],
   HAVE_SYS_PARAM_H=0;     AC_SUBST([HAVE_SYS_PARAM_H])
   REPLACE_CHOWN=0;        AC_SUBST([REPLACE_CHOWN])
   REPLACE_CLOSE=0;        AC_SUBST([REPLACE_CLOSE])
+  REPLACE_DUP2=0;         AC_SUBST([REPLACE_DUP2])
   REPLACE_FCHDIR=0;       AC_SUBST([REPLACE_FCHDIR])
   REPLACE_GETCWD=0;       AC_SUBST([REPLACE_GETCWD])
   REPLACE_GETPAGESIZE=0;  AC_SUBST([REPLACE_GETPAGESIZE])