[Bug c++/102341] [modules] "error: conflicting exporting declaration" for anything previously declared

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102341

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Nathaniel Shead <nshead@gcc.gnu.org>:

https://gcc.gnu.org/g:9dd8be6fc2debc4fbd0950386d4e98878af27a45

commit r14-5838-g9dd8be6fc2debc4fbd0950386d4e98878af27a45
Author: Nathaniel Shead <nathanieloshead@gmail.com>
Date:   Mon Nov 13 16:48:36 2023 +1100

    c++: Allow exporting a typedef redeclaration [PR102341]

    A typedef doesn't create a new entity, and thus should be allowed to be
    exported even if it has been previously declared un-exported. See the
    example in [module.interface] p6:

      export module M;
      struct S { int n; };
      typedef S S;
      export typedef S S;             // OK, does not redeclare an entity

            PR c++/102341

    gcc/cp/ChangeLog:

            * decl.cc (duplicate_decls): Allow exporting a redeclaration of
            a typedef.

    gcc/testsuite/ChangeLog:

            * g++.dg/modules/export-1.C: Adjust test.
            * g++.dg/modules/export-2_a.C: New test.
            * g++.dg/modules/export-2_b.C: New test.

    Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>