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From: Achim Gratz <Stromeko@nexgo.de>
To: cygwin@cygwin.com
Subject: Re: [Attn: gcc maintainers] Re: unhandled C++ exceptions not
 propagating
References: <vritk0xzfpk6.fsf@gmail.com>
 <20200816125306.60dc246baf63d7f9fba60611@nifty.ne.jp>
 <6c27d8d6-876a-6c09-bccd-a9123400cfdb@cornell.edu>
 <20200816225221.d7c41334927c9766d6e26415@nifty.ne.jp>
 <84a15cee-d772-4422-9cf0-1cec8d188cae@cornell.edu>
 <70f23307-6aaf-db8a-103e-81303350ffec@cornell.edu>
 <9525d8c2-74af-5c04-8a04-d84df4b1f2ef@cornell.edu>
 <20200817181359.GI3272@calimero.vinschen.de>
Date: Mon, 17 Aug 2020 20:44:28 +0200
In-Reply-To: <20200817181359.GI3272@calimero.vinschen.de> (Corinna Vinschen's
 message of "Mon, 17 Aug 2020 20:13:59 +0200")
Message-ID: <874kp1qfhv.fsf@Rainer.invalid>
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Corinna Vinschen writes:
> This stuff isn't really my strong point.  IIUC the above comment correctly,
> we might get away with adding another case to the exception handler switch:
>
>   #define STATUS_GCC_THROW 0x20474343
>   case STATUS_GCC_THROW:
>     return ExceptionContinueExecution;
>
> Did you try that, by any chance?

There is a clear expectation that SEH is available on 64bit as expressed
in cygming.h from gcc (but not on 32bit, which explains why there's no
problem there):

#define TARGET_SEH  (TARGET_64BIT_MS_ABI && flag_unwind_tables)

and MS_ABI is the default for 64bit, flag_unwind_tables is a global
variable that is set to 1 by default and very few platforms set it to 0.


Regards,
Achim.
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