https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83273
Bug ID: 83273
Summary: if constexpr does not fail with run-time conditions
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: nico at josuttis dot de
Target Milestone: ---
The following C++17 program should not compile, but it does:
#include <iostream>
int main()
{
auto d = 42;
if constexpr (d > 0) {
std::cout << "oops \n";
}
}
This even works inside a loop over different values of d.
And I found it trying this:
if constexpr (auto obj = 42; obj == 0) {
//...
}
which should need a const/constexpr in the if initialization.
Reported as recommended by Jonathan Wakely.
Might also be a problem in 7.x
