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, but 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 improvement.
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.

0 files changed, 0 insertions, 0 deletions