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Subject: Re: unhandled C++ exceptions not propagating
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Date: Sun, 16 Aug 2020 03:25:43 +0000
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From: JonY via Cygwin <cygwin AT cygwin DOT com>
Reply-To: JonY <10walls AT gmail DOT com>
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From: JonY <10walls AT gmail DOT com>
To: cygwin AT cygwin DOT com
Message-ID: <85e96870-818a-78a5-e78a-d1cfa48772ee AT gmail DOT com>
Subject: Re: unhandled C++ exceptions not propagating
References: <vritk0xzfpk6 DOT fsf AT gmail DOT com>
In-Reply-To: <vritk0xzfpk6 DOT fsf AT gmail DOT com>

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On 8/15/20 11:38 PM, David McFarland via Cygwin wrote:
>=20
> I was just debugging a c++ app (b2 build system from boost), and notice=
d
> that it would appear to exit unexpectedly without an error.  This turne=
d
> out to be when an unhandled C++ exception was thrown.
>=20
> On a fresh install of cygwin with gcc-g++, this program will throw an
> exception from the std::string constructor:
>=20
> c++ -x c++ - <<END
> #include <string>
> int main() { std::string str(nullptr); return 0; }
> END
>=20
> When it's executed from the shell it returns zero, but execution stops
> at the exception.
>=20
> $ ./a; echo $?
> 0
>=20
> When executed under gdb, the exception is caught, and the process exits=

> non-zero when continued:
>=20
> (gdb) r
> Starting program: /home/corngood/a
> [New Thread 4300.0x1390]
> [New Thread 4300.0x1d24]
> [New Thread 4300.0x1d48]
> [New Thread 4300.0x80c]
> gdb: unknown target exception 0x20474343 at 0x7ff8d2cfa799
> Thread 1 "a" received signal ?, Unknown signal.
> 0x00007ff8d2cfa799 in RaiseException () from /cygdrive/c/WINDOWS/System=
32/KERNELBASE.dll
> (gdb) c
> Continuing.
> [Thread 4300.0x1d24 exited with code 541541187]
> [Thread 4300.0x1870 exited with code 541541187]
> [Thread 4300.0x1d48 exited with code 541541187]
> [Thread 4300.0x1390 exited with code 541541187]
> [Inferior 1 (process 4300) exited with code 04021641503]
> (gdb)
>=20
> When executed under strace, it exits with an error as expected:
>=20
> $ strace -o /dev/null a; echo $?
> 67
>=20
> That's as far as I've investigated so far.

Can you try if different (older) GCC versions exhibit the same problem?
You'll need to recompile your example with said version as well.


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