From: Jonathan Wakely <jwakely@redhat.com>
Date: Thu, 14 Sep 2023 08:18:34 +0000 (+0100)
Subject: libstdc++: Add testcase for std::make_integer_sequence bug [PR111357]
X-Git-Tag: basepoints/gcc-15~6147
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=557a858f2ead4ae8b64b157d7fd33830a81646d5;p=thirdparty%2Fgcc.git

libstdc++: Add testcase for std::make_integer_sequence bug [PR111357]

The compiler bug has been fixed on trunk, but this adds a regression test
for the library component.

libstdc++-v3/ChangeLog:

	PR c++/111357
	* testsuite/20_util/integer_sequence/pr111357.cc: New test.
---

diff --git a/libstdc++-v3/testsuite/20_util/integer_sequence/pr111357.cc b/libstdc++-v3/testsuite/20_util/integer_sequence/pr111357.cc
new file mode 100644
index 000000000000..1ad06b732afc
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/integer_sequence/pr111357.cc
@@ -0,0 +1,34 @@
+// { dg-do compile { target c++14 } }
+
+// PR c++/111357 - __integer_pack fails to work with values of dependent type
+// convertible to integers in noexcept context
+
+#include <utility>
+
+using std::integer_sequence;
+using std::make_integer_sequence;
+
+template<int... V>
+void g(integer_sequence<int,V...>)
+{}
+
+template<typename ...T>
+struct c1
+{
+  static constexpr int value = 1;
+  constexpr operator int() { return value; }
+};
+
+template<typename T>
+struct R
+{
+  using S = make_integer_sequence<int,c1<T>{}>;
+
+  R() noexcept(noexcept(g(S()))) // { dg-bogus "argument to .__integer_pack." }
+  {}
+};
+
+int main()
+{
+  R<int>();
+}