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Date: Sun, 16 Aug 2020 12:53:06 +0900
To: cygwin AT cygwin DOT com
Subject: Re: unhandled C++ exceptions not propagating
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From: Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
Cc: David McFarland <corngood AT gmail DOT com>
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On Sat, 15 Aug 2020 20:38:01 -0300
David McFarland via Cygwin <cygwin AT cygwin DOT com> wrote:
> 
> I was just debugging a c++ app (b2 build system from boost), and noticed
> that it would appear to exit unexpectedly without an error.  This turned
> out to be when an unhandled C++ exception was thrown.
> 
> On a fresh install of cygwin with gcc-g++, this program will throw an
> exception from the std::string constructor:
> 
> c++ -x c++ - <<END
> #include <string>
> int main() { std::string str(nullptr); return 0; }
> END
> 
> When it's executed from the shell it returns zero, but execution stops
> at the exception.
> 
> $ ./a; echo $?
> 0
> 
> When executed under gdb, the exception is caught, and the process exits
> non-zero when continued:
> 
> (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/System32/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)
> 
> When executed under strace, it exits with an error as expected:
> 
> $ strace -o /dev/null a; echo $?
> 67
> 
> That's as far as I've investigated so far.

Is this the same issue with
https://cygwin.com/pipermail/cygwin/2019-October/242795.html ?

As far as I tested, this does not occur in 32-bit cygwin.

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
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