On Tue, 20 Sep 2022, Nathan Sidwell wrote:
> On 9/19/22 09:52, Patrick Palka wrote:
> > It looks like some xtreme-header-* tests are failing after the libstdc++
> > change r13-2158-g02f6b405f0e9dc ultimately because we're neglecting
> > to stream PACK_EXPANSION_EXTRA_ARGS, which leads to false equivalences
> > of different partial instantiations of _TupleConstraints::__constructible.
> >
> > Tested on x86_64-pc-linux-gnu, does this look OK for trunk?
> >
> > PR c++/106761
> >
> > gcc/cp/ChangeLog:
> >
> > * module.cc (trees_out::type_node) <case TYPE_PACK_EXPANSION>:
> > Stream PACK_EXPANSION_EXTRA_ARGS.
> > (trees_in::tree_node) <case TYPE_PACK_EXPANSION>: Likewise.
>
>
> Looks good, I wonder why I missed that. (I guess extracting a testcase out of
> the headers was too tricky?)
Many thanks. I managed to produce a small testcase which mirrors the
format of the xtreme-header-2* testcase. Does the following look OK?
-- >8 --
PR c++/106761
gcc/cp/ChangeLog:
* module.cc (trees_out::type_node) <case TYPE_PACK_EXPANSION>:
Stream PACK_EXPANSION_EXTRA_ARGS.
(trees_in::tree_node) <case TYPE_PACK_EXPANSION>: Likewise.
gcc/testsuite/ChangeLog:
* g++.dg/modules/pr106761.h: New test.
* g++.dg/modules/pr106761_a.H: New test.
* g++.dg/modules/pr106761_b.C: New test.
---
gcc/cp/module.cc | 3 +++
gcc/testsuite/g++.dg/modules/pr106761.h | 22 ++++++++++++++++++++++
gcc/testsuite/g++.dg/modules/pr106761_a.H | 5 +++++
gcc/testsuite/g++.dg/modules/pr106761_b.C | 7 +++++++
4 files changed, 37 insertions(+)
create mode 100644 gcc/testsuite/g++.dg/modules/pr106761.h
create mode 100644 gcc/testsuite/g++.dg/modules/pr106761_a.H
create mode 100644 gcc/testsuite/g++.dg/modules/pr106761_b.C
diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index 1a1ff5be574..9a9ef4e3332 100644
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -8922,6 +8922,7 @@ trees_out::type_node (tree type)
if (streaming_p ())
u (PACK_EXPANSION_LOCAL_P (type));
tree_node (PACK_EXPANSION_PARAMETER_PACKS (type));
+ tree_node (PACK_EXPANSION_EXTRA_ARGS (type));
break;
case TYPENAME_TYPE:
@@ -9455,12 +9456,14 @@ trees_in::tree_node (bool is_use)
{
bool local = u ();
tree param_packs = tree_node ();
+ tree extra_args = tree_node ();
if (!get_overrun ())
{
tree expn = cxx_make_type (TYPE_PACK_EXPANSION);
SET_TYPE_STRUCTURAL_EQUALITY (expn);
PACK_EXPANSION_PATTERN (expn) = res;
PACK_EXPANSION_PARAMETER_PACKS (expn) = param_packs;
+ PACK_EXPANSION_EXTRA_ARGS (expn) = extra_args;
PACK_EXPANSION_LOCAL_P (expn) = local;
res = expn;
}
diff --git a/gcc/testsuite/g++.dg/modules/pr106761.h
b/gcc/testsuite/g++.dg/modules/pr106761.h
new file mode 100644
index 00000000000..9f22a22a45d
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/pr106761.h
@@ -0,0 +1,22 @@
+// PR c++/106761
+
+template<class...>
+struct __and_;
+
+template<class, class>
+struct is_convertible;
+
+template<class... Ts>
+struct _TupleConstraints {
+ template<class... Us>
+ using __constructible = __and_<is_convertible<Ts, Us>...>;
+};
+
+template<class... Ts>
+struct tuple {
+ template<class... Us>
+ using __constructible
+ = typename _TupleConstraints<Ts...>::template __constructible<Us...>;
+};
+
+tuple<int, int> t;
diff --git a/gcc/testsuite/g++.dg/modules/pr106761_a.H
b/gcc/testsuite/g++.dg/modules/pr106761_a.H
new file mode 100644
index 00000000000..8ad116412af
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/pr106761_a.H
@@ -0,0 +1,5 @@
+// PR c++/106761
+// { dg-additional-options -fmodule-header }
+
+// { dg-module-cmi {} }
+#include "pr106761.h"
diff --git a/gcc/testsuite/g++.dg/modules/pr106761_b.C
b/gcc/testsuite/g++.dg/modules/pr106761_b.C
new file mode 100644
index 00000000000..336cb12757e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/pr106761_b.C
@@ -0,0 +1,7 @@
+// PR c++/106761
+// { dg-additional-options -fmodules-ts }
+
+#include "pr106761.h"
+import "pr106761_a.H";
+
+tuple<int, int> u = t;
--
2.38.0.rc0.52.gdda7228a83
