On 8/15/2020 11:53 PM, Takashi Yano via Cygwin wrote:
On Sat, 15 Aug 2020 20:38:01 -0300 David McFarland via Cygwin <cygwin@cygwin.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.
This doesn't seem to be a new issue. I found the following report from 6 years ago, on Cygwin 1.7.30 with GCC 4.9.0:
https://stackoverflow.com/questions/24402412/program-executed-on-cygwin-does-not-report-a-thrown-exception Ken -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
