Package: g++-5
Version: 5.1.1-9
Severity: normal
--- Please enter the report below this line. ---
The attached simple C++ source compiles fine but causes a segmentation
fault using current version of g++-5 and optimization levels -O2 or -O3.
The same code compiles and runs fine with g++ 4.9.1 with either
optimization level so it appears there is a problem with the optimizer
in version 5.
To reproduce:
$ g++-5 -O2 -g code.cpp
$ gdb -ex run a.out
(...)
Reading symbols from a.out...done.
Starting program: /home/user/a.out
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff75c93d7 in _Unwind_Resume ()
from /lib/x86_64-linux-gnu/libgcc_s.so.1
Compiling with -O1 or lower produces the expected output when running:
$ g++-5 -O1 test.cpp
$ ./a.out
terminate called after throwing an instance of 'MyException'
what(): MyException: No!
Aborted
--- System information. ---
Architecture: amd64
Kernel: Linux 3.16.0-4-amd64
Debian Release: stretch/sid
500 testing mirror.aarnet.edu.au
500 stable security.debian.org
500 stable mirror.aarnet.edu.au
#include <exception>
#include <string>
class MyException : public std::exception
{
protected:
typedef std::exception Parent;
public:
MyException(const char* cStr): Parent(), m_reason(cStr) {
updateMessage();
}
virtual ~MyException() throw() {}
virtual const std::string& exceptionName() const {
return exceptionNameValue;
}
virtual const char* what() const throw() {
return m_exceptionMessage.c_str();
}
inline void updateMessage() {
m_exceptionMessage = exceptionName() + ": " + m_reason;
}
private:
std::string m_reason;
std::string m_exceptionMessage;
static const std::string exceptionNameValue;
};
const std::string MyException::exceptionNameValue("MyException");
int main() {
throw MyException("No!");
return 0;
}
