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Author SHA1 Message Date
Akim Demaille
9a91e7f246 doc: liby's main arms the internationalization 
Reported by Nicolas Bedon.
<https://lists.gnu.org/archive/html/bug-bison/2014-11/msg00005.html>

* doc/bison.texi (Yacc Library): Document the call the setlocale.
 2015-01-12 11:37:24 +01:00
Akim Demaille
671850a1c3 bison: avoid warnings from static code analysis 
A static analysis tool reports that some callers of symbol_list_n_get
might get NULL and not handle it properly.  This is not the case, yet
we can suppress this pattern.

Reported by Mike Sullivan.
<https://lists.gnu.org/archive/html/bug-bison/2013-12/msg00027.html>

* src/symlist.c (symbol_list_n_get): Actually it is never called
to return 0.  Enforce this postcondition via aver.
(symbol_list_n_type_name_get): Simplify accordingly.  In particular,
discards a (translated) useless error message.
* src/symlist.h: Adjust documentation.
* src/scan-code.l: Style change.
 2015-01-09 15:27:59 +01:00
Akim Demaille
ee028dceff c++: fix the use of destructors when variants are enabled 
When using variants, destructors generate invalid code.
<http://lists.gnu.org/archive/html/bug-bison/2014-09/msg00005.html>
Reported by Michael Catanzaro.

* data/c++.m4 (~basic_symbol): b4_symbol_foreach works on yysym:
define it.
* tests/c++.at (Variants): Check it.
 2015-01-09 13:54:58 +01:00
Akim Demaille
e1d06b5235 style: tests: simplify the handling of some C++ tests 
* tests/c++.at: here.
(Doxygen): Pass %define, so that files such as position.hh etc.
are generated, instead of putting everything into input.hh.
 2015-01-08 16:08:00 +01:00
Akim Demaille
821394a3c8 c++: symbols can be empty, so use it 
The previous patches ensure that symbols (symbol_type and
stack_symbol_type) can be empty, cleared, and their emptiness can be
checked.  Therefore, yyempty, which codes whether yyla is empty or
not, is now useless.

In C skeletons (e.g., yacc.c), the fact that the lookahead is empty is
coded by "yychar = YYEMPTY", which is exactly what this patch
restores, since yychar/yytoken corresponds to yyla.type.

* data/lalr1.cc (yyempty): Remove.
Rather, depend on yyla.empty ().
 2015-01-08 16:07:59 +01:00
Akim Demaille
00cebd11d4 c++: variants: don't leak the lookahead in error recovery 
During error recovery, when discarding the lookeahead, we don't
destroy it, which is caught by parse.assert assertions.

Reported by Antonio Silva Correia.
With an analysis and suggested patch from Michel d'Hooge.
<http://savannah.gnu.org/support/?108481>

* tests/c++.at (Variants): Strengthen the test to try syntax errors
with discarded lookahead.
 2015-01-08 16:07:59 +01:00
Akim Demaille
ee2f433512 c++: provide a means to clear symbols 
The symbol destructor is currently the only means to clear a symbol.
Unfortunately during error recovery we might have to clear the
lookahead, which is a local variable (yyla) that has not yet reached
its end of scope.

Rather that duplicating the code to destroy a symbol, or rather than
destroying and recreating yyla, let's provide a means to clear a
symbol.

Reported by Antonio Silva Correia, with an analysis from Michel d'Hooge.
<http://savannah.gnu.org/support/?108481>

* data/c++.m4, data/lalr1.cc (basis_symbol::clear, by_state::clear)
(by_type::clear): New.
(basic_symbol::~basic_symbol): Use clear.
 2015-01-08 16:07:59 +01:00
Akim Demaille
5422471cbb c++: clean up the handling of empty symbols 
* data/c++.m4, data/lalr1.cc (yyempty_): Remove, replaced by...
(empty_symbol, by_state::empty_state): these.
(basic_symbol::empty): New.
 2015-01-08 14:45:42 +01:00
Akim Demaille
8a4ec3595b c++: comment and style changes 
* data/c++.m4, data/lalr1.cc: More documentation.
Tidy.
* tests/c++.at (string_cast): Rename as...
(to_string): this C++11 name.
 2015-01-08 11:25:07 +01:00
Akim Demaille
7cf84b13a0 c++: variants: comparing addresses of typeid.name() is undefined 
Instead of storing and comparing pointers to names of types, store
pointers to the typeids, and compares the typeids.
Reported by Thomas Jahns.
<http://lists.gnu.org/archive/html/bug-bison/2014-03/msg00001.html>

* data/variant.hh (yytname_): Replace with...
(yytypeid_): this.
 2015-01-07 10:34:07 +01:00
Akim Demaille
56351d4c7b c++: locations: complete the API and fix comments 
There are no support for += between locations, and some comments are wrong.
Reported by Alexandre Duret-Lutz.

* data/location.cc: Fix.
* doc/bison.texi: Document.
* tests/c++.at: Check.
 2015-01-05 18:32:23 +01:00
Akim Demaille
478c4a8f49 build: do not clean figure sources in make clean 
"make clean && make" fails in in-tree builds.

* doc/local.mk (CLEANDIRS): Replace with...
(CLEANFILES): this safer list of files to clean.
 2015-01-05 14:41:46 +01:00
Akim Demaille
13e294ee55 Merge remote-tracking branch 'origin/maint' 
* origin/maint:
  build: don't try to generate docs when cross-compiling
  package: fix a reporter's name
  %union: fix the support for named %union
  package: bump to 2015
  flex: don't trust YY_USER_INIT
  yacc.c: fix broken union when api.value.type=union and %defines are used
  doc: fix missing xref
  gnulib: update
  location: remove some ugly debugging code traces
  build: use abort to pacify compiler errors
  package: bump to 2014
  doc: specify documentation encoding
 2015-01-05 13:51:30 +01:00
Akim Demaille
a16074bb09 build: don't try to generate docs when cross-compiling 
When cross-compiling don't run the generated bison to update the docs.
Reported by Aaro Koskinen.
<http://lists.gnu.org/archive/html/bison-patches/2014-03/msg00000.html>

* configure.ac (CROSS_COMPILING): New.
* doc/local.mk: Use it.
 2015-01-05 12:27:27 +01:00
Akim Demaille
8386f6ef28 package: fix a reporter's name 
* THANKS, build-aux/git-log-fix: s/Bernd Edligner/Bernd Edlinger/.
 2015-01-04 18:00:51 +01:00
Akim Demaille
827bc59ca1 %union: fix the support for named %union 
Bison supports a union tag, for obscure reasons.  But it does a poor
job at it, especially since Bison 3.0.
Reported by Stephen Cameron and Tobias Frost.

It did not ensure that the name was not given several times.  An easy
way to do this is to make the %union tag be handled as a %define
variable, as they cannot be defined several times.

Since Bison 3.0, the synclines were wrongly placed, resulting in
invalid code.  Addressing this issue, because of the way the union tag
was stored (as a code muscle), would have been tedious.  Unless we
rather define the %union tag as a %percent variable, whose synclines
are easier to manipulate.

So replace the b4_union_name muscle by the api.value.union.name
%define variable, document, and check.

* data/bison.m4: Make sure that api.value.union.name has a keyword value.
* data/c++.m4: Make sure that api.value.union.name is not defined.
* data/c.m4 (b4_union_name): No longer use it, use api.value.union.name.
* doc/bison.texi (%define Summary): Document it.
* src/parse-gram.y (union_name): No longer define b4_uion_name, but
api.value.union.name.
* tests/input.at (Redefined %union name): New.
* tests/synclines.at (%union name syncline): New.
* tests/types.at: Check named %unions.
 2015-01-04 18:00:51 +01:00
Akim Demaille
3209eb1c4c package: bump to 2015 
Which also requires:

* gnulib: Update.
 2015-01-04 17:49:13 +01:00
Akim Demaille
975bb56431 flex: don't trust YY_USER_INIT 
Reported by Bernd Edligner and others.

* src/scan-gram.l: here.
 2014-12-31 14:54:43 +01:00
Akim Demaille
8d4dc896cb yacc.c: fix broken union when api.value.type=union and %defines are used 
Reported by Rich Wilson.

* data/c.m4 (b4_symbol_type_register): Append to b4_union_members,
not b4_user_union_members.
The latter invokes the former, but it is the former which is reinitialized
to empty by b4_value_type_setup_union.
* tests/types.at: Check it.

This reveals another bug, this time in the case of glr.c parsers.

* data/glr.c: Generate the header file before the implementation file,
to be sure that the setup is run before what depends on it.
 2014-12-31 14:39:05 +01:00
Akim Demaille
a3c3c6f242 doc: fix missing xref 
Reported by xolodho.

* doc/bison.texi (Printer Decl): here.
 2014-12-31 12:49:39 +01:00
Akim Demaille
179b2419ba gnulib: update 2014-12-29 16:13:57 +01:00
Akim Demaille
b702ec61ab location: remove some ugly debugging code traces 
* data/location.cc: here.
 2014-02-03 15:27:03 +01:00
Akim Demaille
ab96bb2457 build: use abort to pacify compiler errors 
clang, with -DNDEBUG and -Werror fails on some functions that might
lack a return.  This is because aver is just another assert, discarded
with -DNDEBUG.  So use abort.

* src/muscle-tab.c, src/scan-skel.l: here.
 2014-02-03 15:27:02 +01:00
Akim Demaille
fc51acddb4 package: bump to 2014 
* AUTHORS, ChangeLog-2012, Makefile.am, NEWS, PACKAGING, README,
* README-alpha, README-hacking, THANKS, TODO, bootstrap.conf,
* build-aux/darwin11.4.0.valgrind, build-aux/local.mk,
* build-aux/update-b4-copyright,
* build-aux/update-package-copyright-year, cfg.mk, configure.ac,
* data/README, data/bison.m4, data/c++-skel.m4, data/c++.m4,
* data/c-like.m4, data/c-skel.m4, data/c.m4, data/glr.c, data/glr.cc,
* data/java-skel.m4, data/java.m4, data/lalr1.cc, data/lalr1.java,
* data/local.mk, data/location.cc, data/stack.hh, data/variant.hh,
* data/xslt/bison.xsl, data/xslt/xml2dot.xsl, data/xslt/xml2text.xsl,
* data/xslt/xml2xhtml.xsl, data/yacc.c, djgpp/Makefile.maint,
* djgpp/README.in, djgpp/config.bat, djgpp/config.sed,
* djgpp/config.site, djgpp/config_h.sed, djgpp/djunpack.bat,
* djgpp/local.mk, djgpp/subpipe.c, djgpp/subpipe.h,
* djgpp/testsuite.sed, doc/bison.texi, doc/local.mk, doc/refcard.tex,
* etc/README, etc/bench.pl.in, etc/local.mk,
* examples/calc++/calc++.test, examples/calc++/local.mk,
* examples/extexi, examples/local.mk, examples/mfcalc/local.mk,
* examples/mfcalc/mfcalc.test, examples/rpcalc/local.mk,
* examples/rpcalc/rpcalc.test, examples/test, examples/variant.yy,
* lib/abitset.c, lib/abitset.h, lib/bbitset.h, lib/bitset.c,
* lib/bitset.h, lib/bitset_stats.c, lib/bitset_stats.h,
* lib/bitsetv-print.c, lib/bitsetv-print.h, lib/bitsetv.c,
* lib/bitsetv.h, lib/ebitset.c, lib/ebitset.h, lib/get-errno.c,
* lib/get-errno.h, lib/lbitset.c, lib/lbitset.h, lib/libiberty.h,
* lib/local.mk, lib/main.c, lib/timevar.c, lib/timevar.def,
* lib/timevar.h, lib/vbitset.c, lib/vbitset.h, lib/yyerror.c,
* m4/bison-i18n.m4, m4/c-working.m4, m4/cxx.m4, m4/flex.m4,
* m4/timevar.m4, src/AnnotationList.c, src/AnnotationList.h,
* src/InadequacyList.c, src/InadequacyList.h, src/LR0.c, src/LR0.h,
* src/Sbitset.c, src/Sbitset.h, src/assoc.c, src/assoc.h,
* src/closure.c, src/closure.h, src/complain.c, src/complain.h,
* src/conflicts.c, src/conflicts.h, src/derives.c, src/derives.h,
* src/files.c, src/files.h, src/flex-scanner.h, src/getargs.c,
* src/getargs.h, src/gram.c, src/gram.h, src/graphviz.c,
* src/graphviz.h, src/ielr.c, src/ielr.h, src/lalr.c, src/lalr.h,
* src/local.mk, src/location.c, src/location.h, src/main.c,
* src/muscle-tab.c, src/muscle-tab.h, src/named-ref.c,
* src/named-ref.h, src/nullable.c, src/nullable.h, src/output.c,
* src/output.h, src/parse-gram.c, src/parse-gram.y, src/print-xml.c,
* src/print-xml.h, src/print.c, src/print.h, src/print_graph.c,
* src/print_graph.h, src/reader.c, src/reader.h, src/reduce.c,
* src/reduce.h, src/relation.c, src/relation.h, src/scan-code.h,
* src/scan-code.l, src/scan-gram.h, src/scan-gram.l, src/scan-skel.h,
* src/scan-skel.l, src/state.c, src/state.h, src/symlist.c,
* src/symlist.h, src/symtab.c, src/symtab.h, src/system.h,
* src/tables.c, src/tables.h, src/uniqstr.c, src/uniqstr.h,
* tests/actions.at, tests/atlocal.in, tests/bison.in, tests/c++.at,
* tests/calc.at, tests/conflicts.at, tests/cxx-type.at,
* tests/existing.at, tests/glr-regression.at, tests/headers.at,
* tests/input.at, tests/java.at, tests/javapush.at, tests/local.at,
* tests/local.mk, tests/named-refs.at, tests/output.at, tests/push.at,
* tests/reduce.at, tests/regression.at, tests/sets.at,
* tests/skeletons.at, tests/synclines.at, tests/testsuite.at,
* tests/torture.at, tests/types.at:
here.
 2014-02-03 15:27:02 +01:00
Paul Eggert
957255b82c doc: specify documentation encoding 
* doc/bison.texi: Add '@documentencoding UTF-8'; needed since the
manual contains UTF-8 characters.  This will cause the .info files
to contain UTF-8 quotes and the like, which should be OK nowadays.
Add @documentlanguage while we're at it.
 2014-01-03 11:08:50 -08:00
Akim Demaille
8044fda634 symbols: properly fuse the properties of two symbol aliases 
This completes and fixes a728075710.
Reported by Valentin Tolmer.

Before it Bison used to put the properties of the symbols
(associativity, printer, etc.) in the 'symbol' structure.  An
identifier-named token (FOO) and its string-named alias ("foo")
duplicated these properties, and symbol_check_alias_consistency()
checked that both had compatible properties and fused them, at the end
of the parsing of the grammar.

The commit a728075710 introduces a
sym_content structure that keeps all these properties, and ensures
that both aliases point to the same sym_content (instead of
duplicating).  However, it removed symbol_check_alias_consistency,
which resulted in the non-fusion of *existing* properties:

  %token FOO "foo"
  %left FOO %left "foo"

was properly diagnosed as a redeclaration, but

  %left FOO %left "foo"
  %token FOO "foo"

was not, as the properties of FOO and "foo" were not checked before
fusion.  It certainly also means that

  %left "foo"
  %token FOO "foo"

did not transfer properly the associativity to FOO.

The fix is simple: reintroduce symbol_check_alias_consistency (under a
better name, symbol_merge_properties) and call it where appropriate.

Also, that commit made USER_NUMBER_HAS_STRING_ALIAS useless, but left
it.

* src/symtab.h (USER_NUMBER_HAS_STRING_ALIAS): Remove, unused.
Adjust dependencies.
* src/symtab.c (symbol_merge_properties): New, based on the former
symbol_check_alias_consistency.
* tests/input.at: Re-enable tests that we now pass.
 2013-12-10 09:43:33 +01:00
Akim Demaille
b7d4c48e55 Merge remote-tracking branch 'origin/maint' 
* origin/maint:
  package: install the examples
  package: install README and the like in docdir
  diagnostics: fix the order of multiple declarations reports
  symbol: provide an easy means to compare them in source order

Conflicts:
  src/symtab.c
  tests/input.at

* tests/input.at: Comment out a test that master currently does not
pass (because of a728075710).
 2013-12-10 08:53:07 +01:00
Akim Demaille
b167e7ba0d package: install the examples 
Currently, we do not install the various examples extracted from the
documentation.  Let's do it, as they are useful starting points.

* configure.ac: When --enable-gcc-warnings is set, enable ENABLE_GCC_WARNINGS.
* examples/extexi: No longer issue synclines by default.
* examples/local.mk: Except if ENABLE_GCC_WARNINGS.
* examples/calc++/local.mk, examples/mfcalc/local.mk,
* examples/rpcalc/local.mk: Install the example files.
 2013-12-09 16:53:14 +01:00
Akim Demaille
85d57e27d2 package: install README and the like in docdir 
* Makefile.am: here.
 2013-12-09 16:53:14 +01:00
Akim Demaille
461f1516f8 diagnostics: fix the order of multiple declarations reports 
On

  %token FOO "foo"
  %printer {} "foo"
  %printer {} FOO

we report

  /tmp/foo.yy:2.10-11: error: %printer redeclaration for FOO
   %printer {} "foo"
            ^^
  /tmp/foo.yy:3.10-11:     previous declaration
   %printer {} FOO
            ^^

* src/symtab.c (locations_sort): New.
Use it.
* tests/input.at (Invalid Aliases): Stress the order of diagnostics.
 2013-12-09 16:53:03 +01:00
Akim Demaille
26eb4f0bdc symbol: provide an easy means to compare them in source order 
* src/symtab.c (symbols_sort): New.
(user_token_number_redeclaration): Taken from here.
 2013-12-09 16:03:03 +01:00
Akim Demaille
fc6c85664a Merge remote-tracking branch 'origin/maint' 
* origin/maint: (43 commits)
  maint: post-release administrivia
  version 3.0.2
  gnulib: update
  output: do not generate source files when late errors are caught
  output: record what generated files are source or report files
  output: do not generate source files when early errors are caught
  xml: also use "%empty" with html output
  style: formatting changes
  xml: also display %empty for empty right-hand sides
  reports: display %empty in the generated pointed-rules
  news: YYERROR vs variants
  style: scope reduction in lalr.cc
  lalr1.cc: formatting changes
  lalr1.cc: fix the support of YYERROR with variants
  tests: check $$'s destruction with variant, YYERROR, and no error recovery
  tests: simplify useless obfuscation
  skeletons: use better names when computing a "goto"
  maint: post-release administrivia
  version 3.0.1
  aver: it is no longer "protected against NDEBUG"
  ...

Conflicts:
  data/glr.c
 2013-12-09 10:43:37 +01:00
Akim Demaille
0bd5ee5f89 maint: post-release administrivia 
* NEWS: Add header line for next release.
* .prev-version: Record previous version.
* cfg.mk (old_NEWS_hash): Auto-update.
 2013-12-05 15:16:28 +01:00
Akim Demaille
a3efd13e44 version 3.0.2 
* NEWS: Record release date.
v3.0.2 		2013-12-05 14:58:22 +01:00
Akim Demaille
a4122000c6 gnulib: update 
* gnulib: here.
 2013-12-05 14:42:08 +01:00
Akim Demaille
461983270c output: do not generate source files when late errors are caught 
Reported by Alexandre Duret-Lutz as "second problem" in:
http://lists.gnu.org/archive/html/bug-bison/2013-09/msg00015.html

* bootstrap.conf: We need the "unlink" module.
* src/files.h, src/files.c (unlink_generated_sources): New.
* src/output.c: Use it.
* tests/output.at: Check the case of late errors.
 2013-12-04 15:53:01 +01:00
Akim Demaille
ea99d6e6a0 output: record what generated files are source or report files 
* src/files.h, src/files.c (output_file_name_check): Take an additional
argument to record whether a file is a source or report file.
* src/files.c (generated_file): New.
(file_names, file_names_count): Replace with...
(generated_files, generated_files_size): these.
* src/scan-skel.l: Adjust.
 2013-12-04 15:53:01 +01:00
Akim Demaille
184b42c85b output: do not generate source files when early errors are caught 
Reported by Alexandre Duret-Lutz as "second problem" in:
http://lists.gnu.org/archive/html/bug-bison/2013-09/msg00015.html

One problem is that some errors are caught early, before the
generation of output files, while others can only be detected
afterwards (since, for instance, skeletons can raise errors
themselves).

This will be addressed in two steps: early errors do not generate
source files at all, while later errors will remove the files that
have already been generated.

* src/scan-skel.l (yyout): Open to /dev/null when there are errors.
* tests/output.at (AT_CHECK_FILES): Factored out of...
(AT_CHECK_OUTPUT): this.
Fuse the "SHELLIO" argument in the "FLAGS" one.
Use $5 to denote the expected exit status.
Add a test case for early errors.
 2013-12-04 15:53:01 +01:00
Akim Demaille
be29c71dd8 xml: also use "%empty" with html output 
* data/xslt/xml2xhtml.xsl: No longer issue an Epsilon, display as in
dot and text formats.
 2013-11-26 16:28:22 +01:00
Akim Demaille
d439985436 style: formatting changes 
* src/print-xml.c: here.
 2013-11-26 16:20:55 +01:00
Akim Demaille
f3d2a1b2ac xml: also display %empty for empty right-hand sides 
* data/xslt/xml2dot.xsl, data/xslt/xml2text.xsl: Display %empty where needed.
 2013-11-26 16:20:52 +01:00
Akim Demaille
21cf80399f reports: display %empty in the generated pointed-rules 
* src/print.c (print_core): Use %empty for empty rules.
* src/print_graph.c (print_core): Ditto.
* tests/conflicts.at, tests/output.at, tests/reduce.at: Adjust
expectations.
 2013-11-26 15:31:52 +01:00
Akim Demaille
7b0ca050f7 news: YYERROR vs variants 2013-11-26 15:31:51 +01:00
Akim Demaille
a339aef48a style: scope reduction in lalr.cc 
* src/lalr.c: Shorten variable scopes.
(lookahead_tokens_print): Use the same variable name in two loops
iterating over the same structure.
 2013-11-18 10:29:23 +01:00
Akim Demaille
44186fc4ec lalr1.cc: formatting changes 
* data/lalr1.cc: Fix indentation.
 2013-11-15 10:14:06 +01:00
Akim Demaille
5c77412162 lalr1.cc: fix the support of YYERROR with variants 
When variant are enabled, the yylhs variable (the left-hand side of
the rule being reduced, i.e. $$ and @$) is explicitly destroyed when
YYERROR is called.  This is because before running the user code, $$
is initialized, so that the user can properly use it.

However, when quitting yyparse, yylhs is also reclaimed by the C++
compiler: the variable goes out of scope.

Instead of trying to be too smart, let the compiler do its job: reduce
the scope of yylhs to exactly the reduction.  This way, whatever the
type of scope exit (regular, exception, return, goto...) this variable
will be properly reclaimed.

Reported by Paolo Simone Gasparello.
<http://lists.gnu.org/archive/html/bug-bison/2013-10/msg00003.html>

* data/lalr1.cc (yyparse): Reduce the scope of yylhs.
* tests/c++.at: We now pass this test.
 2013-11-15 10:14:05 +01:00
Akim Demaille
5cf6e669af tests: check $$'s destruction with variant, YYERROR, and no error recovery 
When variant are enabled, the yylhs variable (the left-hand side of
the rule being reduced, i.e. $$ and @$) is explicitly destroyed when
YYERROR is called.  This is because before running the user code, $$
is initialized, so that the user can properly use it.

However, when quitting yyparse, yylhs is also reclaimed by the C++
compiler: the variable goes out of scope.

This was not detected by the test suite because (i) the Object tracker
was too weak, and (ii) the problem does not show when there is error
recovery.

Reported by Paolo Simone Gasparello.
<http://lists.gnu.org/archive/html/bug-bison/2013-10/msg00003.html>

* tests/c++.at (Exception safety): Improve the objects logger to make
sure that we never destroy twice an object.
Also track copy-constructors.
Use a set instead of a list.
Display the logs before running the function body, this is more
useful in case of failure.
Generalize to track with and without error recovery.
 2013-11-15 10:13:47 +01:00
Akim Demaille
16bb9f1647 tests: simplify useless obfuscation 
* tests/c++.at: $$ is not special for M4, there is no need to "escape"
it.
 2013-11-15 09:38:15 +01:00
Akim Demaille
edb2e90531 skeletons: use better names when computing a "goto" 
* data/glr.c (yyLRgotoState): Name the symbol argument yysym, instead
of yylhs.
* data/lalr1.cc (yy_lr_goto_state_): Likewise.
* data/lalr1.java (yy_lr_goto_state_): New, modeled after the previous
two routines.
Use it.
 2013-11-14 16:26:16 +01:00
Akim Demaille
6d94eebba7 maint: post-release administrivia 
* NEWS: Add header line for next release.
* .prev-version: Record previous version.
* cfg.mk (old_NEWS_hash): Auto-update.
 2013-11-12 18:37:14 +01:00