https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99901
Bug ID: 99901
Summary: static const class var implemented with constexpr
doesn't emit symbols in C++17 mode
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: tellowkrinkle at gmail dot com
Target Milestone: ---
The following code fails to output any symbols when compiled with `-std=c++17`:
struct A {
static const int a;
};
constexpr int A::a = 5;
Godbolt link: https://gcc.godbolt.org/z/13efnK4x4
You can run this in a way that results in a linker error with the following:
a.h:
#pragma once
struct A { static const int a; };
a.cpp:
#include "a.h"
constexpr int A::a = 0;
main.cpp:
#include "a.h"
int main() { return A::a; }
Works fine when compiled with `g++ main.cpp a.cpp`
Fails when compiled with `g++ -std=c++17 main.cpp a.cpp`
