[gcc r12-3555] c++: default ctor that's also a list ctor [PR102050]

[gcc r12-3555] c++: default ctor that's also a list ctor [PR102050]

[Patrick Palka]

https://gcc.gnu.org/g:2ab5c3d5457f0d480c6423ee7ac52ce1f98592c9

commit r12-3555-g2ab5c3d5457f0d480c6423ee7ac52ce1f98592c9
Author: Patrick Palka <ppalka@redhat.com>
Date:   Wed Sep 15 13:54:53 2021 -0400

    c++: default ctor that's also a list ctor [PR102050]
    
    In grok_special_member_properties we need to set TYPE_HAS_COPY_CTOR,
    TYPE_HAS_DEFAULT_CONSTRUCTOR and TYPE_HAS_LIST_CTOR independently
    from each other because a constructor can be both a default and list
    constructor (as in the first testcase), or both a default and copy
    constructor (as in the second testcase).
    
            PR c++/102050
    
    gcc/cp/ChangeLog:
    
            * decl.c (grok_special_member_properties): Set
            TYPE_HAS_COPY_CTOR, TYPE_HAS_DEFAULT_CONSTRUCTOR
            and TYPE_HAS_LIST_CTOR independently from each other.
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/cpp0x/initlist125.C: New test.
            * g++.dg/cpp0x/initlist126.C: New test.

Diff:
---
 gcc/cp/decl.c                            |  6 ++++--
 gcc/testsuite/g++.dg/cpp0x/initlist125.C | 12 ++++++++++++
 gcc/testsuite/g++.dg/cpp0x/initlist126.C | 17 +++++++++++++++++
 3 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
index 9ad9446e262..c0f1496636f 100644
--- a/gcc/cp/decl.c
+++ b/gcc/cp/decl.c
@@ -14847,9 +14847,11 @@ grok_special_member_properties (tree decl)
 	  if (ctor > 1)
 	    TYPE_HAS_CONST_COPY_CTOR (class_type) = 1;
 	}
-      else if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
+
+      if (sufficient_parms_p (FUNCTION_FIRST_USER_PARMTYPE (decl)))
 	TYPE_HAS_DEFAULT_CONSTRUCTOR (class_type) = 1;
-      else if (is_list_ctor (decl))
+
+      if (is_list_ctor (decl))
 	TYPE_HAS_LIST_CTOR (class_type) = 1;
 
       if (DECL_DECLARED_CONSTEXPR_P (decl)
diff --git a/gcc/testsuite/g++.dg/cpp0x/initlist125.C b/gcc/testsuite/g++.dg/cpp0x/initlist125.C
new file mode 100644
index 00000000000..49dee1c0ccd
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/initlist125.C
@@ -0,0 +1,12 @@
+// PR c++/102050
+// { dg-do compile { target c++11 } }
+
+#include <initializer_list>
+
+struct A {
+  A(std::initializer_list<int> = {});
+};
+
+A x{0};
+A y{1, 2, 3};
+A z;
diff --git a/gcc/testsuite/g++.dg/cpp0x/initlist126.C b/gcc/testsuite/g++.dg/cpp0x/initlist126.C
new file mode 100644
index 00000000000..0a8fb998be6
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/initlist126.C
@@ -0,0 +1,17 @@
+// PR c++/102050
+// { dg-do compile { target c++11 } }
+
+#include <initializer_list>
+
+extern struct A a;
+
+struct A {
+  A(const A& = a);
+  A(std::initializer_list<int>) = delete;
+};
+
+void f(A);
+
+int main() {
+  f({}); // { dg-bogus "deleted" }
+}