https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98881
--- Comment #6 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:77772f8a3da8ea30066d2201f8148714a8e89da5 commit r14-9356-g77772f8a3da8ea30066d2201f8148714a8e89da5 Author: Nathaniel Shead <nathanielosh...@gmail.com> Date: Tue Mar 5 15:17:09 2024 +1100 c++: Stream DECL_CONTEXT for template template parms [PR98881] When streaming in a nested template-template parameter as in the attached testcase, we end up reaching the containing template-template parameter in 'tpl_parms_fini'. We should not set the DECL_CONTEXT to this (nested) template-template parameter, as it should already be the struct that the outer template-template parameter is declared on. The precise logic for what DECL_CONTEXT should be for a template template parameter in various situations seems rather obscure. Rather than trying to determine the assumptions that need to hold, it seems simpler to just always re-stream the DECL_CONTEXT as needed for now. PR c++/98881 gcc/cp/ChangeLog: * module.cc (trees_out::tpl_parms_fini): Stream out DECL_CONTEXT for template template parameters. (trees_in::tpl_parms_fini): Read it. gcc/testsuite/ChangeLog: * g++.dg/modules/tpl-tpl-parm-3.h: New test. * g++.dg/modules/tpl-tpl-parm-3_a.H: New test. * g++.dg/modules/tpl-tpl-parm-3_b.C: New test. * g++.dg/modules/tpl-tpl-parm-3_c.C: New test. Signed-off-by: Nathaniel Shead <nathanielosh...@gmail.com> Reviewed-by: Patrick Palka <ppa...@redhat.com> Reviewed-by: Jason Merrill <ja...@redhat.com>
