Rule 6.2.1: non-inline constexpr variables in headers?

Rule 6.2.1: non-inline constexpr variables in headers? - Printable Version

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Rule 6.2.1: non-inline constexpr variables in headers? - cgpzs - 22-11-2024

Hi,

Consider the following example:

Code:
// foo.h

constexpr int kFoo = 123;

inline int foo(int x)

{ 

  return x * kFoo;

}

// tu1.cpp

#include "foo.h"

int tu1() { return foo(1); }

// tu2.cpp

#include "foo.h"

int tu2() { return foo(2); }

Does the function "foo" violate Rule 6.2.1 in this context, given that kFoo is not a C++17 inline variable?
Or would it violate 6.2.1 only if kFoo were ODR-used (for example, passed by reference)?

Thanks!