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From:	Achim Gratz <Stromeko AT nexgo DOT de>
To:	cygwin AT cygwin DOT com
Subject:	Re: [Attn: gcc maintainers] Re: unhandled C++ exceptions not
	propagating
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	<20200817181359 DOT GI3272 AT calimero DOT vinschen DOT 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")
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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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