id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13558	gcd(INT_MIN, INT_MIN) crashes	Evan Driscoll <evaned@…>	Daryle Walker	"The following produces a SIGFPE for me:

{{{#!c++
#include <iostream>
#include <climits>
#include <boost/integer/common_factor_rt.hpp>

int main()
{
    std::cout << boost::integer::gcd(INT_MIN, INT_MIN);
}
}}}

because it simplifies `gcd(INT_MIN, INT_MIN)` => `gcd(INT_MIN % INT_MIN, INT_MIN)` => `gcd(0, INT_MIN)` => `gcd(0, INT_MIN % 0)` => gcd(0, SIGFPE)`.

I'm actually not sure what the right behavior is (the documented behavior is that the return is always positive, and, for example, `gcd(-2, -2)` returns 2, but obviously you can't do that here).

Boost 1.63 returned `INT_MIN` in this case, which seems like the best answer.

Responsible commit: https://github.com/boostorg/integer/commit/beb68718640150f67fe5671bbbb7848d9e7170b8"	Bugs	new	To Be Determined	integer	Boost 1.67.0	Problem			evaned@…