From: Jason Merrill <jason@redhat.com>
Date: Thu, 21 Jul 2022 00:00:58 +0000 (-0400)
Subject: c++: defaulted friend op== [PR106361]
X-Git-Tag: Thesis~4607
X-Git-Url: https://gcc.gnu.org/git/?a=commitdiff_plain;h=28be481cf47d52af8b11972d2394226bbaf87867;p=gcc.git

c++: defaulted friend op== [PR106361]

Now non-member functions can be defaulted, so this assert is wrong.
move_signature_fn_p already checks for ctor or op=.

	PR c++/106361

gcc/cp/ChangeLog:

	* decl.cc (move_fn_p): Remove assert.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp2a/spaceship-eq14.C: New test.
---

diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc
index aa6cf3c6c2eb..70ad681467ee 100644
--- a/gcc/cp/decl.cc
+++ b/gcc/cp/decl.cc
@@ -15022,8 +15022,6 @@ copy_fn_p (const_tree d)
 bool
 move_fn_p (const_tree d)
 {
-  gcc_assert (DECL_FUNCTION_MEMBER_P (d));
-
   if (cxx_dialect == cxx98)
     /* There are no move constructors if we are in C++98 mode.  */
     return false;
diff --git a/gcc/testsuite/g++.dg/cpp2a/spaceship-eq14.C b/gcc/testsuite/g++.dg/cpp2a/spaceship-eq14.C
new file mode 100644
index 000000000000..896e5232bf69
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/spaceship-eq14.C
@@ -0,0 +1,17 @@
+// PR c++/106361
+// { dg-do compile { target c++20 } }
+
+struct foo {
+  int x;
+};
+
+struct bar {
+  foo f;			// { dg-error "operator==" }
+  friend bool operator==(const bar& a, const bar& b);
+};
+
+bool operator==(const bar& a, const bar& b) = default;
+
+int main() {
+  return bar{} == bar{};	// { dg-error "deleted" }
+}