From: Jason Merrill <jason@redhat.com>
Date: Tue, 8 Jun 2021 13:19:58 +0000 (-0400)
Subject: c++: braced-list overload resolution [PR100963]
X-Git-Tag: upstream/12.2.0~7398
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=91349e57bbfd010156b9128b2ad751c8843e7245;p=platform%2Fupstream%2Fgcc.git

c++: braced-list overload resolution [PR100963]

My PR969626 patch made us ignore template candidates when there's a perfect
non-template candidate.  In this case, we were considering B(int) a perfect
match for B({0}), but the brace elision makes it imperfect.

	PR c++/100963

gcc/cp/ChangeLog:

	* call.c (perfect_conversion_p): Check check_narrowing.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp0x/initlist124.C: New test.
---

diff --git a/gcc/cp/call.c b/gcc/cp/call.c
index 17fc60c..d2f6ca8 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -5880,6 +5880,9 @@ perfect_conversion_p (conversion *conv)
 			next_conversion (conv)->type))
 	return false;
     }
+  if (conv->check_narrowing)
+    /* Brace elision is imperfect.  */
+    return false;
   return true;
 }
 
diff --git a/gcc/testsuite/g++.dg/cpp0x/initlist124.C b/gcc/testsuite/g++.dg/cpp0x/initlist124.C
new file mode 100644
index 0000000..45dcbb3
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/initlist124.C
@@ -0,0 +1,13 @@
+// PR c++/100963
+// { dg-do compile { target c++11 } }
+
+#include <initializer_list>
+
+struct B {
+  B(int) = delete;
+  template<class T> B(std::initializer_list<T>);
+};
+
+int main() {
+  B({0});
+}