[gcc r13-5313] c++: vector of class with bool ctor [PR108195]

[Jason Merrill <jason@gcc.gnu.org>]

https://gcc.gnu.org/g:72e46b3c7ad5e3d2c69868a510c00707c356106a

commit r13-5313-g72e46b3c7ad5e3d2c69868a510c00707c356106a
Author: Jason Merrill <jason@redhat.com>
Date:   Mon Jan 23 15:03:47 2023 -0500

    c++: vector of class with bool ctor [PR108195]
    
    The transformation done by r13-4564 to use the iterator constructor instead
    of the initializer-list constructor breaks if the iterator pointers are
    themselves treated as elements of an initializer-list, so check for that.
    
            PR c++/108195
    
    gcc/cp/ChangeLog:
    
            * call.cc (build_user_type_conversion_1): Check whether the
            iterators also find a list ctor.
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/cpp0x/initlist-vect2.C: New test.

Diff:
---
 gcc/cp/call.cc                              |  2 +-
 gcc/testsuite/g++.dg/cpp0x/initlist-vect2.C | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/gcc/cp/call.cc b/gcc/cp/call.cc
index a7de0e8e9a6..5715a7cd1de 100644
--- a/gcc/cp/call.cc
+++ b/gcc/cp/call.cc
@@ -4581,7 +4581,7 @@ build_user_type_conversion_1 (tree totype, tree expr, int flags,
   if (tree iters = maybe_init_list_as_range (cand->fn, expr))
     if (z_candidate *cand2
 	= build_user_type_conversion_1 (totype, iters, flags, tf_none))
-      if (cand2->viable == 1)
+      if (cand2->viable == 1 && !is_list_ctor (cand2->fn))
 	{
 	  cand = cand2;
 	  expr = iters;
diff --git a/gcc/testsuite/g++.dg/cpp0x/initlist-vect2.C b/gcc/testsuite/g++.dg/cpp0x/initlist-vect2.C
new file mode 100644
index 00000000000..eec7d340fd1
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/initlist-vect2.C
@@ -0,0 +1,16 @@
+// PR c++/108195
+// { dg-do run { target c++11 } }
+
+#include <vector>
+
+struct S
+{
+  S(bool) {}
+};
+
+int main()
+{
+  std::vector<S> v = { true, false, true };
+  if (v.size() != 3)
+    __builtin_abort ();
+}