On Mon, 15 Apr 2024, Nathaniel Shead wrote: > I'm not a huge fan of always streaming 'imported_temploid_friends' for > all decls, but I don't think it adds much performance cost over adding a > new flag to categorise decls that might be marked as such.
IIUC this value is going to be almost always null which is encoded as a single 0 byte, which should be fast to stream. But I wonder how much larger <bits/stdc++.h> gets? Can we get away with streaming this value only for TEMPLATE_DECLs? > > Bootstrapped and regtested on x86_64-pc-linux-gnu, OK for trunk? > > -- >8 -- > > This patch fixes a number of issues with the handling of temploid friend > declarations. > > The primary issue is that instantiations of friend declarations should > attach the declaration to the same module as the befriending class, by > [module.unit] p7.1 and [temp.friend] p2; this could be a different > module from the current TU, and so needs special handling. Nice, your approach seems consistent with Nathan's comments in the past about this issue: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/603288.html https://gcc.gnu.org/pipermail/gcc-patches/2023-February/611215.htmlw > > The other main issue here is that we can't assume that just because name > lookup didn't find a definition for a hidden template class, it doesn't > mean that it doesn't exist: it could be a non-exported entity that we've > nevertheless streamed in from an imported module. We need to ensure > that when instantiating friend classes that we return the same TYPE_DECL > that we got from our imports, otherwise we will get later issues with > 'duplicate_decls' (rightfully) complaining that they're different. > > This doesn't appear necessary for functions due to the existing name > lookup handling already finding these hidden declarations. It does seem like a weird inconsistency that tsubst_friend_class needs this workaround but not tsubst_friend_function. I wonder if we can relax duplicate_decls to treat an instantiated template friend class as a redeclaration instead of complaining, mirroring its behavior for functions, which in turn would let us get rid of the name lookup in tsubst_friend_class and eliminate the need for lookup_imported_hidden_friend? This may be too speculative/risky of a refactoring at this stage though, and your approach has the nice advantage of changing only modules code paths. In any case I hope we can fix this issue for GCC 14! LGTM overall. > > PR c++/105320 > PR c++/114275 > > gcc/cp/ChangeLog: > > * cp-tree.h (propagate_defining_module): Declare. > (lookup_imported_hidden_friend): Declare. > * decl.cc (duplicate_decls): Also check if hidden declarations > can be redeclared in this module. > * module.cc (imported_temploid_friends): New map. > (init_modules): Initialize it. > (trees_out::decl_value): Write it. > (trees_in::decl_value): Read it. > (get_originating_module_decl): Follow the owning decl for an > imported temploid friend. > (propagate_defining_module): New function. > * name-lookup.cc (lookup_imported_hidden_friend): New function. > * pt.cc (tsubst_friend_function): Propagate defining module for > new friend functions. > (tsubst_friend_class): Lookup imported hidden friends. Check > for valid redeclaration. Propagate defining module for new > friend classes. > > gcc/testsuite/ChangeLog: > > * g++.dg/modules/tpl-friend-10_a.C: New test. > * g++.dg/modules/tpl-friend-10_b.C: New test. > * g++.dg/modules/tpl-friend-10_c.C: New test. > * g++.dg/modules/tpl-friend-11_a.C: New test. > * g++.dg/modules/tpl-friend-11_b.C: New test. > * g++.dg/modules/tpl-friend-12_a.C: New test. > * g++.dg/modules/tpl-friend-12_b.C: New test. > * g++.dg/modules/tpl-friend-12_c.C: New test. > * g++.dg/modules/tpl-friend-12_d.C: New test. > * g++.dg/modules/tpl-friend-12_e.C: New test. > * g++.dg/modules/tpl-friend-12_f.C: New test. > * g++.dg/modules/tpl-friend-13_a.C: New test. > * g++.dg/modules/tpl-friend-13_b.C: New test. > * g++.dg/modules/tpl-friend-13_c.C: New test. > * g++.dg/modules/tpl-friend-13_d.C: New test. > * g++.dg/modules/tpl-friend-13_e.C: New test. > * g++.dg/modules/tpl-friend-9.C: New test. > > Signed-off-by: Nathaniel Shead <nathanielosh...@gmail.com> > --- > gcc/cp/cp-tree.h | 2 + > gcc/cp/decl.cc | 36 +++++++------ > gcc/cp/module.cc | 52 +++++++++++++++++++ > gcc/cp/name-lookup.cc | 42 +++++++++++++++ > gcc/cp/pt.cc | 19 +++++++ > .../g++.dg/modules/tpl-friend-10_a.C | 15 ++++++ > .../g++.dg/modules/tpl-friend-10_b.C | 5 ++ > .../g++.dg/modules/tpl-friend-10_c.C | 7 +++ > .../g++.dg/modules/tpl-friend-11_a.C | 14 +++++ > .../g++.dg/modules/tpl-friend-11_b.C | 5 ++ > .../g++.dg/modules/tpl-friend-12_a.C | 10 ++++ > .../g++.dg/modules/tpl-friend-12_b.C | 9 ++++ > .../g++.dg/modules/tpl-friend-12_c.C | 10 ++++ > .../g++.dg/modules/tpl-friend-12_d.C | 8 +++ > .../g++.dg/modules/tpl-friend-12_e.C | 7 +++ > .../g++.dg/modules/tpl-friend-12_f.C | 8 +++ > .../g++.dg/modules/tpl-friend-13_a.C | 12 +++++ > .../g++.dg/modules/tpl-friend-13_b.C | 9 ++++ > .../g++.dg/modules/tpl-friend-13_c.C | 11 ++++ > .../g++.dg/modules/tpl-friend-13_d.C | 7 +++ > .../g++.dg/modules/tpl-friend-13_e.C | 14 +++++ > gcc/testsuite/g++.dg/modules/tpl-friend-9.C | 13 +++++ > 22 files changed, 299 insertions(+), 16 deletions(-) > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-10_a.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-10_b.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-10_c.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-11_a.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-11_b.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-12_a.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-12_b.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-12_c.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-12_d.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-12_e.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-12_f.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-13_a.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-13_b.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-13_c.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-13_d.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-13_e.C > create mode 100644 gcc/testsuite/g++.dg/modules/tpl-friend-9.C > > diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h > index faa7a0052a5..67cc7d7bcec 100644 > --- a/gcc/cp/cp-tree.h > +++ b/gcc/cp/cp-tree.h > @@ -7417,6 +7417,7 @@ extern unsigned get_importing_module (tree, bool = > false) ATTRIBUTE_PURE; > extern void set_instantiating_module (tree); > extern void set_defining_module (tree); > extern void maybe_key_decl (tree ctx, tree decl); > +extern void propagate_defining_module (tree decl, tree orig); > > extern void mangle_module (int m, bool include_partition); > extern void mangle_module_fini (); > @@ -7649,6 +7650,7 @@ extern bool template_guide_p > (const_tree); > extern bool builtin_guide_p (const_tree); > extern void store_explicit_specifier (tree, tree); > extern tree lookup_explicit_specifier (tree); > +extern tree lookup_imported_hidden_friend (tree); > extern void walk_specializations (bool, > void (*)(bool, spec_entry *, > void *), > diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc > index aa66da4829d..ba8689efe21 100644 > --- a/gcc/cp/decl.cc > +++ b/gcc/cp/decl.cc > @@ -2276,30 +2276,34 @@ duplicate_decls (tree newdecl, tree olddecl, bool > hiding, bool was_hidden) > > if (modules_p () > && TREE_CODE (CP_DECL_CONTEXT (olddecl)) == NAMESPACE_DECL > - && TREE_CODE (olddecl) != NAMESPACE_DECL > - && !hiding) > + && TREE_CODE (olddecl) != NAMESPACE_DECL) > { > if (!module_may_redeclare (olddecl, newdecl)) > return error_mark_node; > > - tree not_tmpl = STRIP_TEMPLATE (olddecl); > - if (DECL_LANG_SPECIFIC (not_tmpl) > - && DECL_MODULE_ATTACH_P (not_tmpl) > - /* Typedefs are not entities and so are OK to be redeclared > - as exported: see [module.interface]/p6. */ > - && TREE_CODE (olddecl) != TYPE_DECL) > + if (!hiding) > { > - if (DECL_MODULE_EXPORT_P (STRIP_TEMPLATE (newdecl)) > - && !DECL_MODULE_EXPORT_P (not_tmpl)) > + /* Hidden friends declarations just use exportingness of the > + old declaration; see CWG2588. */ > + tree not_tmpl = STRIP_TEMPLATE (olddecl); > + if (DECL_LANG_SPECIFIC (not_tmpl) > + && DECL_MODULE_ATTACH_P (not_tmpl) > + /* Typedefs are not entities and so are OK to be redeclared > + as exported: see [module.interface]/p6. */ > + && TREE_CODE (olddecl) != TYPE_DECL) > { > - auto_diagnostic_group d; > - error ("conflicting exporting for declaration %qD", newdecl); > - inform (olddecl_loc, > - "previously declared here without exporting"); > + if (DECL_MODULE_EXPORT_P (STRIP_TEMPLATE (newdecl)) > + && !DECL_MODULE_EXPORT_P (not_tmpl)) > + { > + auto_diagnostic_group d; > + error ("conflicting exporting for declaration %qD", newdecl); > + inform (olddecl_loc, > + "previously declared here without exporting"); > + } > } > + else if (DECL_MODULE_EXPORT_P (newdecl)) > + DECL_MODULE_EXPORT_P (not_tmpl) = true; > } > - else if (DECL_MODULE_EXPORT_P (newdecl)) > - DECL_MODULE_EXPORT_P (not_tmpl) = true; > } > > /* We have committed to returning OLDDECL at this point. */ > diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc > index e2d2910ae48..1a064e4ea79 100644 > --- a/gcc/cp/module.cc > +++ b/gcc/cp/module.cc > @@ -2727,6 +2727,11 @@ vec<tree, va_heap, vl_embed> *post_load_decls; > typedef hash_map<tree, auto_vec<tree>> keyed_map_t; > static keyed_map_t *keyed_table; > > +/* Instantiations of temploid friends imported from another module > + need to be owned by the same module as their instantiating template. > + This maps these to the template that instantiated them. */ > +static hash_map<tree, tree> *imported_temploid_friends; > + > /********************************************************************/ > /* Tree streaming. The tree streaming is very specific to the tree > structures themselves. A tag indicates the kind of tree being > @@ -7997,6 +8002,11 @@ trees_out::decl_value (tree decl, depset *dep) > } > } > > + /* Write imported temploid friends so that importers can reconstruct > + this information on stream-in. */ > + tree* slot = imported_temploid_friends->get (decl); > + tree_node (slot ? *slot : NULL_TREE); > + > bool is_typedef = false; > if (!type && TREE_CODE (inner) == TYPE_DECL) > { > @@ -8303,6 +8313,12 @@ trees_in::decl_value () > } > } > > + if (tree owner = tree_node ()) > + { > + bool exists = imported_temploid_friends->put (decl, owner); > + gcc_assert (exists == !is_new); > + } > + > /* Regular typedefs will have a NULL TREE_TYPE at this point. */ > unsigned tdef_flags = 0; > bool is_typedef = false; > @@ -18930,6 +18946,12 @@ get_originating_module_decl (tree decl) > && DECL_UNINSTANTIATED_TEMPLATE_FRIEND_P (decl)) > decl = TYPE_NAME (DECL_CHAIN (decl)); > > + /* An imported temploid friend is attached to the same module the > + befriending class was. */ > + if (imported_temploid_friends) > + if (tree *slot = imported_temploid_friends->get (decl)) > + decl = *slot; > + > int use; > if (tree ti = node_template_info (decl, use)) > { > @@ -19238,6 +19260,34 @@ maybe_key_decl (tree ctx, tree decl) > vec.safe_push (decl); > } > > +/* DECL is an instantiated friend that should be attached to the same > + module that ORIG is. */ > + > +void > +propagate_defining_module (tree decl, tree orig) > +{ > + if (!modules_p ()) > + return; > + > + tree not_tmpl = STRIP_TEMPLATE (orig); > + if (DECL_LANG_SPECIFIC (not_tmpl) && DECL_MODULE_ATTACH_P (not_tmpl)) > + { > + tree inner = STRIP_TEMPLATE (decl); > + retrofit_lang_decl (inner); > + DECL_MODULE_ATTACH_P (inner) = true; > + } > + > + if (DECL_LANG_SPECIFIC (not_tmpl) && DECL_MODULE_IMPORT_P (not_tmpl)) > + { > + bool exists = imported_temploid_friends->put (decl, orig); > + > + /* We should only be called if lookup for an existing decl > + failed, in which case there shouldn't already be an entry > + in the map. */ > + gcc_assert (!exists); > + } > +} > + > /* Create the flat name string. It is simplest to have it handy. */ > > void > @@ -20451,6 +20501,8 @@ init_modules (cpp_reader *reader) > pending_table = new pending_map_t (EXPERIMENT (1, 400)); > entity_map = new entity_map_t (EXPERIMENT (1, 400)); > vec_safe_reserve (entity_ary, EXPERIMENT (1, 400)); > + imported_temploid_friends > + = new hash_map<tree,tree> (EXPERIMENT (1, 400)); > } > > #if CHECKING_P > diff --git a/gcc/cp/name-lookup.cc b/gcc/cp/name-lookup.cc > index 7af7f00e34c..dd6e7b6eaea 100644 > --- a/gcc/cp/name-lookup.cc > +++ b/gcc/cp/name-lookup.cc > @@ -4453,6 +4453,48 @@ push_local_binding (tree id, tree decl, bool is_using) > add_decl_to_level (b, decl); > } > > +/* Lookup the FRIEND_TMPL within all module imports. Used to dedup > + instantiations of temploid hidden friends from imported modules. */ > + > +tree > +lookup_imported_hidden_friend (tree friend_tmpl) > +{ > + tree inner = DECL_TEMPLATE_RESULT (friend_tmpl); > + if (!DECL_LANG_SPECIFIC (inner) > + || !DECL_MODULE_IMPORT_P (inner)) > + return NULL_TREE; > + > + tree name = DECL_NAME (inner); > + tree *slot = find_namespace_slot (current_namespace, name); > + if (!slot || !*slot || TREE_CODE (*slot) != BINDING_VECTOR) > + return NULL_TREE; > + > + /* Look in the appropriate slot, as with check_module_override. */ > + binding_slot mslot; > + if (named_module_p ()) > + mslot = BINDING_VECTOR_CLUSTER (*slot, BINDING_SLOT_PARTITION > + / BINDING_VECTOR_SLOTS_PER_CLUSTER) > + .slots[BINDING_SLOT_PARTITION % BINDING_VECTOR_SLOTS_PER_CLUSTER]; > + else > + mslot = BINDING_VECTOR_CLUSTER (*slot, 0).slots[BINDING_SLOT_GLOBAL]; > + gcc_assert (!mslot.is_lazy ()); > + > + tree ovl = mslot; > + if (!ovl) > + return NULL_TREE; > + > + /* We're only interested in declarations coming from the same module > + of the friend class we're attempting to instantiate. */ > + int m = get_originating_module (friend_tmpl); > + gcc_assert (m != 0); > + > + for (ovl_iterator iter (ovl); iter; ++iter) > + if (get_originating_module (*iter) == m) > + return *iter; > + > + return NULL_TREE; > +} > + > > /* true means unconditionally make a BLOCK for the next level pushed. */ > > diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc > index 3b2106dd3f6..e7e7f2fbc3b 100644 > --- a/gcc/cp/pt.cc > +++ b/gcc/cp/pt.cc > @@ -11512,6 +11512,10 @@ tsubst_friend_function (tree decl, tree args) > new_friend_result_template_info = DECL_TEMPLATE_INFO (not_tmpl); > } > > + /* We need to propagate module attachment for the new friend from the > + owner of this template. */ > + propagate_defining_module (new_friend, decl); > + > /* Inside pushdecl_namespace_level, we will push into the > current namespace. However, the friend function should go > into the namespace of the template. */ > @@ -11715,6 +11719,12 @@ tsubst_friend_class (tree friend_tmpl, tree args) > tmpl = lookup_name (DECL_NAME (friend_tmpl), LOOK_where::CLASS_NAMESPACE, > LOOK_want::NORMAL | LOOK_want::HIDDEN_FRIEND); > > + if (!tmpl) > + /* If we didn't find by name lookup, the type may still exist but as a > + 'hidden' import; we should check for this too to avoid accidentally > + instantiating a duplicate. */ > + tmpl = lookup_imported_hidden_friend (friend_tmpl); > + > if (tmpl && DECL_CLASS_TEMPLATE_P (tmpl)) > { > /* The friend template has already been declared. Just > @@ -11723,6 +11733,11 @@ tsubst_friend_class (tree friend_tmpl, tree args) > of course. We only need the innermost template parameters > because that is all that redeclare_class_template will look > at. */ > + > + if (modules_p ()) > + /* Check that we can redeclare TMPL in the current context. */ > + module_may_redeclare (tmpl, friend_tmpl); > + > if (TMPL_PARMS_DEPTH (DECL_TEMPLATE_PARMS (friend_tmpl)) > > TMPL_ARGS_DEPTH (args)) > { > @@ -11772,6 +11787,10 @@ tsubst_friend_class (tree friend_tmpl, tree args) > args, tf_warning_or_error); > } > > + /* We need to propagate the attachment of the original template to the > + newly instantiated template type. */ > + propagate_defining_module (tmpl, friend_tmpl); > + > /* Inject this template into the enclosing namspace scope. */ > tmpl = pushdecl_namespace_level (tmpl, /*hiding=*/true); > } > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-10_a.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-10_a.C > new file mode 100644 > index 00000000000..7547326e554 > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-10_a.C > @@ -0,0 +1,15 @@ > +// PR c++/105320 > +// { dg-additional-options "-fmodules-ts -Wno-global-module" } > +// { dg-module-cmi test_support } > + > +module; > +template<class> struct _Sp_atomic; > +template<class> struct shared_ptr { > + template<class> friend struct _Sp_atomic; > + using atomic_type = _Sp_atomic<int>; > +}; > +export module test_support; > +export > +template<class T> struct A { > + shared_ptr<T> data; > +}; > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-10_b.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-10_b.C > new file mode 100644 > index 00000000000..6b88ee4258b > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-10_b.C > @@ -0,0 +1,5 @@ > +// PR c++/105320 > +// { dg-additional-options "-fmodules-ts" } > + > +import test_support; > +A<int> a; > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-10_c.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-10_c.C > new file mode 100644 > index 00000000000..789bdeb64d5 > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-10_c.C > @@ -0,0 +1,7 @@ > +// PR c++/105320 > +// { dg-additional-options "-fmodules-ts" } > +// { dg-module-cmi user } > + > +export module user; > +import test_support; > +A<int> b; > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-11_a.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-11_a.C > new file mode 100644 > index 00000000000..f29eebd1a7f > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-11_a.C > @@ -0,0 +1,14 @@ > +// PR c++/114275 > +// { dg-additional-options "-fmodules-ts -Wno-global-module" } > +// { dg-module-cmi M } > + > +module; > + > +template <typename... _Elements> struct T; > + > +template <typename H> struct T<H> { > + template <typename...> friend struct T; > +}; > + > +export module M; > +export template <typename=void> void fun() { T<int> t; } > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-11_b.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-11_b.C > new file mode 100644 > index 00000000000..5bf79998139 > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-11_b.C > @@ -0,0 +1,5 @@ > +// PR c++/114275 > +// { dg-additional-options "-fmodules-ts" } > + > +import M; > +int main() { fun(); } > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-12_a.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-12_a.C > new file mode 100644 > index 00000000000..216dbf62c71 > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-12_a.C > @@ -0,0 +1,10 @@ > +// { dg-additional-options "-fmodules-ts" } > +// { dg-module-cmi M:A } > + > +module M:A; > + > +template <typename T> struct A { > + template <typename U> friend struct B; > +private: > + int x = 42; > +}; > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-12_b.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-12_b.C > new file mode 100644 > index 00000000000..26e1c38b518 > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-12_b.C > @@ -0,0 +1,9 @@ > +// { dg-additional-options "-fmodules-ts" } > +// { dg-module-cmi M:B } > + > +export module M:B; > +import :A; > + > +export template <typename U> struct B { > + int foo(A<U> a) { return a.x; } > +}; > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-12_c.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-12_c.C > new file mode 100644 > index 00000000000..e44c2819cfd > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-12_c.C > @@ -0,0 +1,10 @@ > +// { dg-additional-options "-fmodules-ts" } > +// { dg-module-cmi M:C } > + > +export module M:C; > +import :A; > + > +template <typename T> struct B; > +export template <typename T, typename U> int bar(B<T> t, U u) { > + return t.foo(u); > +} > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-12_d.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-12_d.C > new file mode 100644 > index 00000000000..9a575ad5046 > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-12_d.C > @@ -0,0 +1,8 @@ > +// { dg-additional-options "-fmodules-ts" } > +// { dg-module-cmi M } > + > +export module M; > +export import :B; > +export import :C; > + > +export int go_in_module(); > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-12_e.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-12_e.C > new file mode 100644 > index 00000000000..329d1e8b263 > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-12_e.C > @@ -0,0 +1,7 @@ > +// { dg-additional-options "-fmodules-ts" } > + > +module M; > + > +int go_in_module() { > + return bar(B<int>{}, A<int>{}); > +} > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-12_f.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-12_f.C > new file mode 100644 > index 00000000000..c9855663fbd > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-12_f.C > @@ -0,0 +1,8 @@ > +// { dg-additional-options "-fmodules-ts" } > + > +import M; > + > +int main() { > + B<double> b{}; > + go_in_module(); > +} > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-13_a.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-13_a.C > new file mode 100644 > index 00000000000..a044485248f > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-13_a.C > @@ -0,0 +1,12 @@ > +// { dg-additional-options "-fmodules-ts" } > +// { dg-module-cmi M } > + > +export module M; > +export template <typename> struct A { > + template <typename> friend struct B; > +}; > + > +export template <typename> struct C { > + friend void f(); > + template <typename> friend void g(); > +}; > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-13_b.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-13_b.C > new file mode 100644 > index 00000000000..72dc8611e39 > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-13_b.C > @@ -0,0 +1,9 @@ > +// { dg-additional-options "-fmodules-ts" } > + > +import M; > +A<int> a; > +template <typename> struct B {}; // { dg-error "conflicts with import" } > + > +C<int> c; > +void f() {} // { dg-error "conflicts with import" } > +template <typename> void g() {} // { dg-error "conflicts with import" } > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-13_c.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-13_c.C > new file mode 100644 > index 00000000000..e1d2860bfe6 > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-13_c.C > @@ -0,0 +1,11 @@ > +// { dg-additional-options "-fmodules-ts" } > + > +import M; > +template <typename> struct B {}; // { dg-message "previously declared" } > +A<int> a; // { dg-message "required from here" } > + > +void f() {} // { dg-message "previously declared" } > +template <typename> void g(); // { dg-message "previously declared" } > +C<int> c; // { dg-message "required from here" } > + > +// { dg-error "conflicting declaration" "" { target *-*-* } 0 } > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-13_d.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-13_d.C > new file mode 100644 > index 00000000000..44b0f441db2 > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-13_d.C > @@ -0,0 +1,7 @@ > +// { dg-additional-options "-fmodules-ts" } > +// { dg-module-cmi O } > + > +export module O; > +export import M; > +A<int> a; > +C<int> c; > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-13_e.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-13_e.C > new file mode 100644 > index 00000000000..cec899e426b > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-13_e.C > @@ -0,0 +1,14 @@ > +// { dg-additional-options "-fmodules-ts" } > + > +template <typename> struct B {}; // { dg-message "previous declaration" } > +void f() {} > +template <typename T> void g() {} > +import O; > +A<double> b; // { dg-message "required from here" } > +C<double> d; // { dg-message "required from here" } > + > +// specifically, B is defined in M, not O, despite the instantiation being > in O > +// { dg-error "conflicting declaration \[^\n\r\]* B@M" "" { target *-*-* } 0 > } > +// and similarly for f and g > +// { dg-error "conflicting declaration \[^\n\r\]* f@M" "" { target *-*-* } 0 > } > +// { dg-error "conflicting declaration \[^\n\r\]* g@M" "" { target *-*-* } 0 > } > diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-9.C > b/gcc/testsuite/g++.dg/modules/tpl-friend-9.C > new file mode 100644 > index 00000000000..c7216f0f8c1 > --- /dev/null > +++ b/gcc/testsuite/g++.dg/modules/tpl-friend-9.C > @@ -0,0 +1,13 @@ > +// PR c++/114275 > +// { dg-additional-options "-fmodules-ts" } > +// { dg-module-cmi M } > + > +export module M; > + > +template<class> struct A { > + template<class> friend struct B; > + friend void C(); > +}; > +A<int> a; > +void C() {} > +template<class> struct B { }; > -- > 2.43.2 > >
