https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119097
Nathaniel Shead <nshead at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|Modules references internal |Modules treats non-ODR
|linkage entity error |usages of constexpr values
| |as exposure
CC| |nshead at gcc dot gnu.org
--- Comment #1 from Nathaniel Shead <nshead at gcc dot gnu.org> ---
This is related to
https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p1815r2.html.
Specifically, only exposures of TU-local entities should error; the bodies of
inline functions will error, the bodies of non-inline should not. Functions
defined in a class body are implicitly 'inline' (hence the errors when declared
in the header file) unless attached to a named module (hence the errors not
occurring when declared in the module).
That said, for this specific instance none of these cases should error; by
https://eel.is/c++draft/basic.link#14.4 we have:
"A declaration is an exposure if it either names a TU-local entity (defined
below), ignoring ... any reference to a non-volatile const object or reference
with internal or no linkage initialized with a constant expression that is not
an odr-use ([basic.def.odr])."
None of these usages are ODR-uses, so this should be OK.
