Do namespace objects declared with decltype(auto) for which a const qualified type is deduced have internal linkage?

[Tom Honermann]

Consider:

extern const int ci;
decltype(auto) aci = ci;

A strict reading of C++14 [basic.link] 3.5p3 suggests that 'aci' does
not have internal linkage:

"A name having namespace scope (3.3.6) has internal linkage if it is the
name of
— a variable, function or function template that is explicitly declared
static; or,
— a non-volatile variable that is explicitly declared const or constexpr
and neither explicitly declared extern nor previously declared to have
external linkage; or
— a data member of an anonymous union."

There appears to be implementation divergence. Clang (trunk) gives 'aci' internal linkage while gcc (6.2) gives it external linkage.

Tom.

[T. C.]

This now says "of non-volatile const-qualified type".  See CWG 1686.

[Tom Honermann]

Thank you!  (No idea why it didn't occur to me to, you know, actually check that exact same section in the WP.  Diligence failure on my part).

Tom.