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* [gcc r13-3236] c++ modules: ICE with templated friend and std namespace [PR100134]
@ 2022-10-11 19:03 Patrick Palka
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From: Patrick Palka @ 2022-10-11 19:03 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:9736a42e1fb8df30d72cf28594d9046bf50200c1
commit r13-3236-g9736a42e1fb8df30d72cf28594d9046bf50200c1
Author: Patrick Palka <ppalka@redhat.com>
Date: Tue Oct 11 15:02:23 2022 -0400
c++ modules: ICE with templated friend and std namespace [PR100134]
The function depset::hash::add_binding_entity has an assert verifying
that if a namespace contains an exported entity, then the namespace must
have been opened in the module purview:
if (data->hash->add_namespace_entities (decl, data->partitions))
{
/* It contains an exported thing, so it is exported. */
gcc_checking_assert (DECL_MODULE_PURVIEW_P (decl));
DECL_MODULE_EXPORT_P (decl) = true;
}
We're tripping over this assert in the below testcase because by
instantiating and exporting std::A<int>, we in turn define and export the
hidden friend std::f(A<int>) without ever having opened the enclosing
namespace std within the module purview, and thus DECL_MODULE_PURVIEW_P
for std is false.
It's important that the enclosing namespace is std here: if we use
a different namespace then the ICE disappears. This probably has
something to do with us predefining std via push_namespace from
cxx_init_decl_processing (which makes it look like we've opened it
within the TU), whereas with another namespace we would instead lazily
create its NAMESPACE_DECL from add_imported_namespace.
Since templated friend functions are special in that they give us a way
to introduce a namespace-scope function without having to explicitly
open the namespace, this patch proposes to fix this ICE by propagating
DECL_MODULE_PURVIEW_P from the introduced function to the enclosing
namespace during tsubst_friend_function.
PR c++/100134
gcc/cp/ChangeLog:
* pt.cc (tsubst_friend_function): Propagate DECL_MODULE_PURVIEW_P
from the introduced namespace-scope function to the namespace.
gcc/testsuite/ChangeLog:
* g++.dg/modules/tpl-friend-8_a.H: New test.
* g++.dg/modules/tpl-friend-8_b.C: New test.
Diff:
---
gcc/cp/pt.cc | 8 ++++++++
gcc/testsuite/g++.dg/modules/tpl-friend-8_a.H | 9 +++++++++
gcc/testsuite/g++.dg/modules/tpl-friend-8_b.C | 8 ++++++++
3 files changed, 25 insertions(+)
diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
index 5b9fc588a21..b80e7ff1845 100644
--- a/gcc/cp/pt.cc
+++ b/gcc/cp/pt.cc
@@ -11448,6 +11448,14 @@ tsubst_friend_function (tree decl, tree args)
by duplicate_decls. */
new_friend = old_decl;
}
+
+ /* We've just introduced a namespace-scope function in the purview
+ without necessarily having opened the enclosing namespace, so
+ make sure the namespace is in the purview now too. */
+ if (modules_p ()
+ && DECL_MODULE_PURVIEW_P (STRIP_TEMPLATE (new_friend))
+ && TREE_CODE (DECL_CONTEXT (new_friend)) == NAMESPACE_DECL)
+ DECL_MODULE_PURVIEW_P (DECL_CONTEXT (new_friend)) = true;
}
else
{
diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-8_a.H b/gcc/testsuite/g++.dg/modules/tpl-friend-8_a.H
new file mode 100644
index 00000000000..bd2290460b5
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/tpl-friend-8_a.H
@@ -0,0 +1,9 @@
+// PR c++/100134
+// { dg-additional-options -fmodule-header }
+// { dg-module-cmi {} }
+
+namespace std {
+ template<class T> struct A {
+ friend void f(A) { }
+ };
+}
diff --git a/gcc/testsuite/g++.dg/modules/tpl-friend-8_b.C b/gcc/testsuite/g++.dg/modules/tpl-friend-8_b.C
new file mode 100644
index 00000000000..76d7447c2eb
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/tpl-friend-8_b.C
@@ -0,0 +1,8 @@
+// PR c++/100134
+// { dg-additional-options -fmodules-ts }
+// { dg-module-cmi pr100134 }
+export module pr100134;
+
+import "tpl-friend-8_a.H";
+
+export std::A<int> a;
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