Thanks for the feedback. I addressed the concerns raised in the previous
patch.
I ran tests with this, after rebasing:
../gcc/configure --prefix=$MYPREFIX --enable-languages=c++
--enable-bootstrap --enable-checking=yes,extra --disable-multilib && make
-j6 && make check
I have the "expected" failures:
* guality
* xtreme-header-4_b.C
* 20050826-2.c scan-tree-dump-not dom2 "Invalid sum"
Additionally, libstdc++-v3/testsuite/30_threads/jthread/95989.cc results in
a target segfault, but this also happens when manually building with
Ubuntu's g++-11 and the specified flags. It looks like this test predates
the 11.1 release, so I doubt this crash is related to the patch.
Other than that, no FAIL or XPASS.
From 22e3d2eb76d1d3178bdd80f67b8be7aea8912d0c Mon Sep 17 00:00:00 2001
From: Barrett Adair <barrettellisad...@gmail.com>
Date: Wed, 15 Sep 2021 15:26:22 -0500
Subject: [PATCH] Fix template instantiation comparison in redeclarations
---
gcc/cp/pt.c | 20 +++++++++++++++++++
gcc/testsuite/g++.dg/cpp0x/constexpr-52830.C | 1 -
gcc/testsuite/g++.dg/template/canon-type-15.C | 7 +++++++
gcc/testsuite/g++.dg/template/canon-type-16.C | 6 ++++++
gcc/testsuite/g++.dg/template/canon-type-17.C | 5 +++++
gcc/testsuite/g++.dg/template/canon-type-18.C | 6 ++++++
.../g++.dg/template/dependent-name15.C | 18 +++++++++++++++++
.../g++.dg/template/dependent-name16.C | 14 +++++++++++++
8 files changed, 76 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/g++.dg/template/canon-type-15.C
create mode 100644 gcc/testsuite/g++.dg/template/canon-type-16.C
create mode 100644 gcc/testsuite/g++.dg/template/canon-type-17.C
create mode 100644 gcc/testsuite/g++.dg/template/canon-type-18.C
create mode 100644 gcc/testsuite/g++.dg/template/dependent-name15.C
create mode 100644 gcc/testsuite/g++.dg/template/dependent-name16.C
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 4d42899f28d..5ba771db678 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -27813,6 +27813,19 @@ dependent_template_arg_p (tree arg)
return value_dependent_expression_p (arg);
}
+/* Identify any expressions that use function parms. */
+static tree
+find_parm_usage_r (tree *tp, int *walk_subtrees, void*)
+{
+ tree t = *tp;
+ if (TREE_CODE (t) == PARM_DECL)
+ {
+ *walk_subtrees = 0;
+ return t;
+ }
+ return NULL_TREE;
+}
+
/* Returns true if ARGS (a collection of template arguments) contains
any types that require structural equality testing. */
@@ -27857,6 +27870,13 @@ any_template_arguments_need_structural_equality_p (tree args)
else if (!TYPE_P (arg) && TREE_TYPE (arg)
&& TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (arg)))
return true;
+ /* Checking current_function_decl because this structural
+ comparison is only necessary for redeclaration. */
+ else if (!current_function_decl
+ && dependent_template_arg_p (arg)
+ && (cp_walk_tree_without_duplicates
+ (&arg, find_parm_usage_r, NULL)))
+ return true;
}
}
}
diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-52830.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-52830.C
index eae0d8c377b..d6057f13497 100644
--- a/gcc/testsuite/g++.dg/cpp0x/constexpr-52830.C
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-52830.C
@@ -1,7 +1,6 @@
// PR c++/52830
// { dg-do compile { target c++11 } }
// { dg-additional-options "-fchecking" }
-// { dg-ice "comptypes" }
template<bool b> struct eif { typedef void type; };
template<> struct eif<false> {};
diff --git a/gcc/testsuite/g++.dg/template/canon-type-15.C b/gcc/testsuite/g++.dg/template/canon-type-15.C
new file mode 100644
index 00000000000..b001b5c841d
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/canon-type-15.C
@@ -0,0 +1,7 @@
+// { dg-do compile { target c++11 } }
+template<unsigned u> struct size_c{ static constexpr unsigned value = u; };
+namespace g {
+template<class T> auto return_size(T t) -> size_c<sizeof(t)>;
+template<class T> auto return_size(T t) -> size_c<sizeof(t)>;
+}
+static_assert(decltype(g::return_size('a'))::value == 1u, "");
diff --git a/gcc/testsuite/g++.dg/template/canon-type-16.C b/gcc/testsuite/g++.dg/template/canon-type-16.C
new file mode 100644
index 00000000000..99361cbac30
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/canon-type-16.C
@@ -0,0 +1,6 @@
+// { dg-do compile { target c++11 } }
+template<bool u> struct bool_c{ static constexpr bool value = u; };
+template<class T> auto noexcepty(T t) -> bool_c<noexcept(t())>;
+template<class T> auto noexcepty(T t) -> bool_c<noexcept(t())>;
+struct foo { void operator()() noexcept; };
+static_assert(decltype(noexcepty(foo{}))::value, "");
diff --git a/gcc/testsuite/g++.dg/template/canon-type-17.C b/gcc/testsuite/g++.dg/template/canon-type-17.C
new file mode 100644
index 00000000000..0555c8d0a42
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/canon-type-17.C
@@ -0,0 +1,5 @@
+// { dg-do compile { target c++11 } }
+template<unsigned u> struct size_c{ static constexpr unsigned value = u; };
+template<class... T> auto return_size(T... t) -> size_c<sizeof...(t)>;
+template<class... T> auto return_size(T... t) -> size_c<sizeof...(t)>;
+static_assert(decltype(return_size('a'))::value == 1u, "");
diff --git a/gcc/testsuite/g++.dg/template/canon-type-18.C b/gcc/testsuite/g++.dg/template/canon-type-18.C
new file mode 100644
index 00000000000..2510181725c
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/canon-type-18.C
@@ -0,0 +1,6 @@
+// { dg-do compile { target c++11 } }
+// { dg-options "-Wno-pedantic" }
+template<unsigned u> struct size_c{ static constexpr unsigned value = u; };
+template<class T> auto get_align(T t) -> size_c<alignof(t)>;
+template<class T> auto get_align(T t) -> size_c<alignof(t)>;
+static_assert(decltype(get_align('a'))::value == 1u, "");
diff --git a/gcc/testsuite/g++.dg/template/dependent-name15.C b/gcc/testsuite/g++.dg/template/dependent-name15.C
new file mode 100644
index 00000000000..1c34bc704f9
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/dependent-name15.C
@@ -0,0 +1,18 @@
+// { dg-do compile { target c++11 } }
+template <int N> struct A { static void foo(){} };
+template <> struct A<sizeof(char)> { using foo = int; };
+
+template <class T> void f(T t1) {
+ A<sizeof(t1)>::foo();
+}
+
+template <class T> void g(T t2) {
+ /* if the comparing_specializations check breaks in cp_tree_equal
+ case PARM_DECL, the error will incorrectly report A<sizeof (t1)> */
+ A<sizeof(t2)>::foo(); // { dg-error "dependent-name .A<sizeof .t2.>::foo" }
+}
+
+void h() {
+ f(0);
+ g('0');
+}
diff --git a/gcc/testsuite/g++.dg/template/dependent-name16.C b/gcc/testsuite/g++.dg/template/dependent-name16.C
new file mode 100644
index 00000000000..ef8c4f23077
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/dependent-name16.C
@@ -0,0 +1,14 @@
+// { dg-do compile { target c++11 } }
+template <int N> struct A { static void foo(){} };
+template <> struct A<sizeof(char)> { using foo = int; };
+
+template<class T1> auto f(T1 t1) -> decltype(A<sizeof(t1)>::foo());
+
+/* if the comparing_specializations check breaks in cp_tree_equal
+case PARM_DECL, the error will incorrectly report A<sizeof (t1)> */
+template<class T2> auto g(T2 t2) -> decltype(A<sizeof(t2)>::foo()); // { dg-error "dependent-name .A<sizeof .t2.>::foo" }
+
+void h() {
+ f(0);
+ g('0'); // { dg-error "no matching function" }
+}
--
2.30.2
