[Bug gdb/20977] GDB exception handling is broken on i686-w64-mingw32

["qiyao at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20977

--- Comment #6 from Yao Qi <qiyao at gcc dot gnu.org> ---
(In reply to Orgad Shaneh from comment #5)
> It still happens with 7.12.1 when I type an invalid command. Trace:
> 
> 1  msvcrt!abort
> 2  uw_init_context_1
> 3  _Unwind_RaiseException
> 4  __cxa_throw
> 5  throw_exception_cxx                        common-exceptions.c 303
> 6  throw_exception                            common-exceptions.c 317
> 7  throw_it                                   common-exceptions.c 373
> 8  throw_verror                               common-exceptions.c 379
> 9  verror                                     utils.c             525
> 10 error                                      errors.c            43
> 11 undef_cmd_error                            cli-decode.c        1475
> 12 lookup_cmd                                 cli-decode.c        1517
> 13 execute_command                            top.c               630
> 14 command_handler                            event-top.c         641
> 15 command_line_handler                       event-top.c         833
> 16 gdb_rl_callback_handler                    event-top.c         213
> 17 rl_callback_read_char                      callback.c          220
> 18 gdb_rl_callback_read_char_wrapper_noexcept event-top.c         175
> 19 gdb_rl_callback_read_char_wrapper          event-top.c         192
> 20 stdin_event_handler                        event-top.c         568
> 21 handle_file_event                          event-loop.c        733
> 22 gdb_wait_for_event                         event-loop.c        884
> 23 gdb_do_one_event                           event-loop.c        347
> 24 gdb_do_one_event                           common-exceptions.h 225
> 25 start_event_loop                           event-loop.c        371
> 26 captured_command_loop                      main.c              324
> 27 catch_errors                               exceptions.c        236
> 28 captured_main                              main.c              1149
> 29 gdb_main                                   main.c              1159
> 30 main                                       gdb.c               32

What is your compiler building GDB?  So far, we only tested on DW2 and SJLJ
exception implementations.  If your compiler is MSVC, Structured Exception
Handling (SEH) is possibly used.  As far as I am aware of, we didn't test it
before.

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