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From: "nathan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/99000] [modules] declaration std::__copy_move_a2 conflicts
 with import
Date: Mon, 08 Feb 2021 20:24:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99000

Nathan Sidwell <nathan at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |SUSPENDED
   Last reconfirmed|                            |2021-02-08
     Ever confirmed|0                           |1

--- Comment #1 from Nathan Sidwell <nathan at gcc dot gnu.org> ---
You're hitting this:


@emph{G++'s modules support is not complete.}  Other than bugs, the
known missing pieces are:

....

@item Textual merging of reachable GM entities
Entities may be multiply defined across different header-units.
These must be de-duplicated, and this is implemented across imports,
or when an import redefines a textually-defined entity.  However the
reverse is not implemented---textually redefining an entity that has
been defined in an imported header-unit.  A redefinition error is
emitted.=