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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/114683] [modules] name declared in GMF in inline namespace
 and exported via using-decl from parent namespace is not visible to importer
Date: Thu, 13 Jun 2024 15:06:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114683

--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:609764a42f0cd3f6358562cab98fc220d3d2d9fd

commit r15-1297-g609764a42f0cd3f6358562cab98fc220d3d2d9fd
Author: Jason Merrill <jason@redhat.com>
Date:   Wed Jun 12 18:24:35 2024 -0400

    c++/modules: export using across namespace [PR114683]

    Currently we represent a non-function using-declaration by inserting the
    named declaration into the target scope.  In general this works fine, b=
ut
in
    the case of an exported using-declaration we have nowhere to mark the
    using-declaration as exported, so we mark the original declaration as
    exported instead, and then treat all using-declarations that name it as
    exported as well.  We were doing this only if there was also a previous
    non-exported using, so for this testcase the export got lost; this patch
    broadens the workaround to also apply to the using that first brings the
    declaration into the current scope.

    This does not fully resolve 114683, but replaces a missing exports bug =
with
    an extra exports bug, which should be a significant usability improveme=
nt.
    The testcase has xfails for extra exports.

    I imagine a complete fix should involve inserting a USING_DECL.

            PR c++/114683

    gcc/cp/ChangeLog:

            * name-lookup.cc (do_nonmember_using_decl): Allow exporting
            a newly inserted decl.

    gcc/testsuite/ChangeLog:

            * g++.dg/modules/using-22_a.C: New test.
            * g++.dg/modules/using-22_b.C: New test.=