On some architectures (e.g., ARM, or even some -flto setups on Intel)
C++ exceptions to not traverse the C functions. So even if the C++
main() has a try/catch, it will not catch the exception thrown by C++
code called from the argp module (which is compiled in C).
* bin/common_setup.cc, bin/common_setup.hh: Define some macros
and function to factorize exception handling.
* bin/autcross.cc, bin/autfilt.cc, bin/common_aoutput.cc,
bin/common_color.cc, bin/common_finput.cc, bin/common_hoaread.cc,
bin/common_output.cc, bin/common_post.cc, bin/common_trans.cc,
bin/dstar2tgba.cc, bin/genaut.cc, bin/genltl.cc, bin/ltl2tgba.cc,
bin/ltl2tgta.cc, bin/ltlcross.cc, bin/ltldo.cc, bin/ltlfilt.cc,
bin/ltlgrind.cc, bin/ltlsynt.cc, bin/randaut.cc, bin/randltl.cc:
Protect all parse_opt() functions, even those where there is currently
no exception risk.
* bin/common_setup.cc, bin/common_setup.hh: Define a protected_main()
function that deal with exceptions.
* bin/autcross.cc, bin/autfilt.cc, bin/dstar2tgba.cc, bin/genaut.cc,
bin/genltl.cc, bin/ltl2tgba.cc, bin/ltl2tgta.cc, bin/ltlcross.cc,
bin/ltldo.cc, bin/ltlfilt.cc, bin/ltlgrind.cc, bin/ltlsynt.cc,
bin/randaut.cc, bin/randltl.cc: Use it for all tools.
It's not used anywhere, not documented, and its output is slightly
broken with options that are too long.
* bin/common_setup.cc: Remove --usage support.
* bin/common_cout.cc (check_cout): Force a flush of cout if more than
20ms has elapsed since the last explicit flush.
* bin/common_setup.cc (setup): Untie cin and cout if the input
is not a TTY, so that cout is flush less often.
* NEWS: Mention the change.
* bin/common_aoutput.cc, bin/common_aoutput.hh, bin/common_setup.cc:
Implement it.
* NEWS, bin/man/spot-x.x: Document it.
* tests/core/readsave.test: Test it.
