https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85557
Bug ID: 85557
Summary: Incorrect calculation of function arguments with C++17
sequencing rules
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ixsci at yandex dot ru
Target Milestone: ---
Given the following simple code:
#include <iostream>
using namespace std;
int foo(int first, int second)
{
return first << second;
}
int main()
{
int i = 0;
cout << "Result: " << foo(i = 1, i = 2) << "\n";
};
The latest GCC (9.0 tested on Wandbox) with -std=c++17 produces the following
output: "Result: 2" but it should produce "Result: 4" because function
parameters calculations are indeterminately sequenced between each other.
