build: ensure release year in copyright notice is up-to-date

From a suggestion by Eric Blake.  See automake bug#11356.
This is a follow-up to previous patch 'v1.12-12-gb99b5be'.

* configure.ac (RELEASE_YEAR): New AC_SUBST'd variable, should hold
the value of the current year.
* Makefile.am (update-copyright): Be sure to also update the
definition of 'RELEASE_YEAR' in configure.ac.
* lib/Automake/Config.in ($RELEASE_YEAR): New exported variable,
initialized from the value substituted for '@RELEASE_YEAR@'.
(@EXPORT): Add it.
* automake.in, aclocal.in: Use '$RELEASE_YEAR' (which will be
substituted at make time) instead of hard-coding the release
year.  This should ensure the copyright range in the version
message and in the generated files (Makefile.in and aclocal.m4)
are automatically kept up-to-date.
* bootstrap (dosubst): Update, also substitute '@RELEASE_YEAR@'.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

diff --git a/Makefile.am b/Makefile.am
index 0d02de7..27b3fa0 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -860,7 +860,11 @@ update_copyright_env = \
 
 .PHONY: update-copyright
 update-copyright:
-       $(AM_V_GEN)excluded_re=`echo $(FETCHFILES) \
+       $(AM_V_GEN)set -e; \
+       current_year=`date +%Y` && test -n "$$current_year" \
+         || { echo "$@: cannot get current year" >&1; exit 1; }; \
+       sed -i "/^RELEASE_YEAR=/s/=.*$$/=$$current_year/" configure.ac; \
+       excluded_re=`echo $(FETCHFILES) \
          | sed -e 's|^|lib/|' -e 's| | lib/|g' -e 's, ,|,g'`; \
        $(GIT) ls-files \
          | grep -Ev '^(lib/)?(COPYING|INSTALL)$$' \

diff --git a/aclocal.in b/aclocal.in
index 1c58fb5..09e1da4 100644 (file)
--- a/aclocal.in
+++ b/aclocal.in
@@ -840,7 +840,7 @@ $output";
   # name in the header.
   $output = "# generated automatically by aclocal $VERSION -*- Autoconf -*-
 
-# Copyright (C) 1996-2012 Free Software Foundation, Inc.
+# Copyright (C) 1996-$RELEASE_YEAR Free Software Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -935,7 +935,7 @@ sub version()
 {
   print <<EOF;
 aclocal (GNU $PACKAGE) $VERSION
-Copyright (C) 2012 Free Software Foundation, Inc.
+Copyright (C) $RELEASE_YEAR Free Software Foundation, Inc.
 License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl-2.0.html>
 This is free software: you are free to change and redistribute it.
 There is NO WARRANTY, to the extent permitted by law.

diff --git a/automake.in b/automake.in
index 544f893..a454109 100644 (file)
--- a/automake.in
+++ b/automake.in
@@ -252,7 +252,7 @@ my %standard_prefix =
 
 # Copyright on generated Makefile.ins.
 my $gen_copyright = "\
-# Copyright (C) 1994-2012 Free Software Foundation, Inc.
+# Copyright (C) 1994-$RELEASE_YEAR Free Software Foundation, Inc.
 
 # This Makefile.in is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -8314,7 +8314,7 @@ sub version ()
 {
   print <<EOF;
 automake (GNU $PACKAGE) $VERSION
-Copyright (C) 2012 Free Software Foundation, Inc.
+Copyright (C) $RELEASE_YEAR Free Software Foundation, Inc.
 License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl-2.0.html>
 This is free software: you are free to change and redistribute it.
 There is NO WARRANTY, to the extent permitted by law.

diff --git a/bootstrap b/bootstrap
index 814aedb..1cede01 100755 (executable)
--- a/bootstrap
+++ b/bootstrap
@@ -77,6 +77,8 @@ dosubst ()
 {
   rm -f $2
   in=`echo $1 | sed 's,^.*/,,'`
+  current_year=`date +%Y` && test -n "$current_year" \
+    || { echo "$me: cannot get current year" >&2; exit 1; }
   sed -e "s%@APIVERSION@%$APIVERSION%g" \
       -e "s%@PACKAGE@%$PACKAGE%g" \
       -e "s%@PERL@%$PERL%g" \
@@ -84,6 +86,7 @@ dosubst ()
       -e "s%@SHELL@%$BOOTSTRAP_SHELL%g" \
       -e "s%@VERSION@%$VERSION%g" \
       -e "s%@datadir@%$datadir%g" \
+      -e "s%@RELEASE_YEAR@%$current_year%g" \
       -e "s%@configure_input@%Generated from $in; do not edit by hand.%g" \
       $1 > $2
   chmod a-w $2

diff --git a/configure.ac b/configure.ac
index 22a158f..2829fd4 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -42,6 +42,11 @@ dnl the automake options to avoid bloating and potential problems.
 AM_INIT_AUTOMAKE([dist-xz filename-length-max=99 color-tests
                  parallel-tests silent-rules no-define no-dependencies])
 
+## Keep this on a line of its own, since it must be found and processed
+## by the 'update-copyright' rule in out Makefile.
+RELEASE_YEAR=2012
+AC_SUBST([RELEASE_YEAR])
+
 # The API version is the base version.  We must guarantee
 # compatibility for all releases with the same API version.
 # Our current rule is that:

diff --git a/lib/Automake/Config.in b/lib/Automake/Config.in
index 24c979c..bbf55ac 100644 (file)
--- a/lib/Automake/Config.in
+++ b/lib/Automake/Config.in
@@ -22,8 +22,8 @@ use 5.006;
 require Exporter;
 
 our @ISA = qw (Exporter);
-our @EXPORT = qw ($APIVERSION $PACKAGE $PACKAGE_BUGREPORT $VERSION $libdir
-                 $perl_threads);
+our @EXPORT = qw ($APIVERSION $PACKAGE $PACKAGE_BUGREPORT $VERSION
+                  $RELEASE_YEAR $libdir $perl_threads);
 
 # Parameters set by configure.  Not to be changed.  NOTE: assign
 # VERSION as string so that e.g. version 0.30 will print correctly.
@@ -31,6 +31,7 @@ our $APIVERSION = '@APIVERSION@';
 our $PACKAGE = '@PACKAGE@';
 our $PACKAGE_BUGREPORT = '@PACKAGE_BUGREPORT@';
 our $VERSION = '@VERSION@';
+our $RELEASE_YEAR = '@RELEASE_YEAR@';
 our $libdir = '@datadir@/@PACKAGE@-@APIVERSION@';
 our $perl_threads = @PERL_THREADS@;