Merge branch 'maint'

* origin/maint:
  regen
  maint: post-release administrivia
  version 2.6.5
  regen
  tests: syntax-check
  tests: beware of compilers that do not support POSIXLY_CORRECT
  gnulib: update

Conflicts:
	src/parse-gram.c
	src/parse-gram.h
	tests/atlocal.in

diff --cc NEWS
Simple merge

diff --cc configure.ac
Simple merge

diff --cc m4/c-working.m4
Simple merge

diff --cc tests/actions.at
Simple merge

diff --cc tests/atlocal.in
index e350d137b23905cb445e4db3653c2028ca8034a9,5e3cb723a48837d92e3782cc56616ab3b4b82587..16e6fda89ef75ab6b0a22f04270aa3ef79fe2e69
--- 1/tests/atlocal.in
--- 2/tests/atlocal.in
+++ b/tests/atlocal.in
@@@ -79,9 -78,14 +79,18 @@@ LIBS="$abs_top_builddir/lib/libbison.a 
  # Empty if no xsltproc was found
  : ${XSLTPROC='@XSLTPROC@'}
  
 -: ${PERL='@PERL@'}
 -
+ # Don't just check if $POSIXLY_CORRECT is set, as Bash, when launched
+ # as /bin/sh, sets the shell variable POSIXLY_CORRECT to y, but not
+ # the environment variable.
+ : ${C_COMPILER_POSIXLY_CORRECT='@C_COMPILER_POSIXLY_CORRECT@'}
+ if env | grep '^POSIXLY_CORRECT=' >/dev/null; then
+   POSIXLY_CORRECT_IS_EXPORTED=true
+ else
+   POSIXLY_CORRECT_IS_EXPORTED=false
+ fi
 +
 +# Handle --compile-c-with-cxx here, once CXX and CXXFLAGS are known.
 +if "$at_arg_compile_c_with_cxx"; then
 +  CC=$CXX
 +  CFLAGS=$CXXFLAGS
 +fi

diff --cc tests/local.at
index d120712d3bc27a60be23b7a57f725439fc63e7f1,88e797f5a272b354046a0a2da6ace722f71a1651..fb74fafc6c50de3b191b7b346efffb339a8c1bf3
--- 1/tests/local.at
--- 2/tests/local.at
+++ b/tests/local.at
@@@ -472,12 -468,8 +472,8 @@@ m4_define([AT_BISON_CHECK_WARNINGS_]
  [[# Defining POSIXLY_CORRECT causes bison to complain if options are
  # added after the grammar file name, so skip these checks in that
  # case.
- #
- # Don't just check if $POSIXLY_CORRECT is set, as Bash, when launched
- # as /bin/sh, sets the shell variable POSIXLY_CORRECT to y, but not
- # the environment variable.
- if env | grep '^POSIXLY_CORRECT=' >/dev/null; then :; else
+ if test "$POSIXLY_CORRECT_IS_EXPORTED" = false; then
 -  ]AT_SAVE_SPECIAL_FILES[
 +          ]AT_SAVE_SPECIAL_FILES[
  
    # To avoid expanding it repeatedly, store specified stdout.
    ]AT_DATA([expout], [$3])[