Description
According to the standard, member functions defined within a class definition are implicitly inline in the global module, but not so within a module purview. However, the standard also states that constexpr member functions are implicitly inline, and in this case makes no exception for modules.
11.4.2/1 [class.mfct] - see also Note 1
9.2.6/1 [dcl.constexpr]
As such all constexpr member functions should be inline, regardless of modules. From what I can see, clang is not respecting this. I'm seeing linker errors for such member functions when using modules with shared libraries.
I believe the difference between clang and gcc seen here is fundamentally the cause. Clang is generating code for a function marked constexpr but not for one marked inline constexpr, yet if I'm interpreting the standard correctly these cases should be equivalent.
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