https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116803
--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Nathaniel Shead <nsh...@gcc.gnu.org>: https://gcc.gnu.org/g:cf9efe5ec14fea3ad5746fbefb22544bb9424d9d commit r15-3937-gcf9efe5ec14fea3ad5746fbefb22544bb9424d9d Author: Nathaniel Shead <nathanielosh...@gmail.com> Date: Fri Sep 27 18:58:27 2024 +1000 c++/modules: Propagate purview/import for templates in duplicate_decls [PR116803] We need to ensure that for a declaration in the module purview, that the resulting declaration has PURVIEW_P set and IMPORT_P cleared so that we understand it might be something requiring exporting. This is normally handled for a declaration by set_instantiating_module, but when this declaration is a redeclaration duplicate_decls needs to propagate this to olddecl. This patch only changes the logic for template declarations, because in the non-template case the whole contents of olddecl's DECL_LANG_SPECIFIC is replaced with newdecl's (which includes these flags), so there's nothing to do. PR c++/116803 gcc/cp/ChangeLog: * decl.cc (duplicate_decls): Propagate DECL_MODULE_PURVIEW_P and DECL_MODULE_IMPORT_P for template redeclarations. gcc/testsuite/ChangeLog: * g++.dg/modules/merge-18_a.H: New test. * g++.dg/modules/merge-18_b.H: New test. * g++.dg/modules/merge-18_c.C: New test. Signed-off-by: Nathaniel Shead <nathanielosh...@gmail.com> Reviewed-by: Jason Merrill <ja...@redhat.com>
