clang rejects the following with error: declaration of 'x' with internal linkage cannot be exported:
export module mod;
extern "C++"
{
export constexpr auto x = 10;
}
Compiler explorer: https://godbolt.org/z/a6nhazoKr
According to [basic.link] 3.2, const (or constexpr ) implies internal linkage for a namespace scope variable, with some exceptions, and 3.2.1 states that one such exception is if the declaration is in the purview of a module interface. clang appears to respect this generally, but in the case of extern "C++" it seems to not apply this exception, as if it considers the contents of such a block to not be part of the module's purview. This feels like a corner case, since obviously the symbols are not attached to the module; but the purview is nonetheless defined as all tokens following the module declaration and I can't see anywhere that states a linkage block is exempt.
Note that MSVC accepts the code.
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