[PATCH 0/9] Various fixes for the tests

A bunch of fixes/improvements, driven by recent bug reports.

Akim Demaille (9):
  c: fix _Noreturn support detection
  tests: be robust to old versions of xlstproc
  tests: remove obsolete checks
  build: check for C++ 20 and 2b
  build: reject C++ compilers that don't support std::vector::data
  build: modernize to newer Autoconf releases
  news: be clear that glr2.cc is C++11
  gnulib: update
  tests: fix incorrect test case

 NEWS                | 15 ++++++------
 configure.ac        |  9 ++++---
 data/skeletons/c.m4 |  2 +-
 gnulib              |  2 +-
 m4/bison-cxx-std.m4 | 59 +++++++++++++++++++++++++++++++++------------
 m4/cxx.m4           | 13 +++++++---
 tests/README.md     |  1 +
 tests/atlocal.in    | 29 ++--------------------
 tests/calc.at       |  4 +--
 tests/local.at      |  6 +++--
 tests/report.at     | 19 ++++++++++++---
 11 files changed, 92 insertions(+), 67 deletions(-)

-- 
2.32.0