re PR c++/78816 ([c++14] Static auto variable usage in generic/variadic lambda fails to compile)

2017-10-04  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/78816
	* g++.dg/cpp1y/lambda-generic-variadic6.C: New.

From-SVN: r253397

gcc/testsuite/ChangeLog

+2017-10-04  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/78816
+	* g++.dg/cpp1y/lambda-generic-variadic6.C: New.
+
 2017-10-04  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/82374

gcc/testsuite/g++.dg/cpp1y/lambda-generic-variadic6.C

+// PR c++/78816
+// { dg-do compile { target c++14 } }
+
+void f(void (*f1)(int)) {
+  f1(42);
+}
+
+template <typename Lambda>
+static auto callback(Lambda &&l)
+{
+  static auto* p = &l;
+  p = &l;
+  return [](auto... x){ return (*p)(x...); };
+}
+
+int main() {
+  int x = 5;
+  f(callback([=](int y){}));
+}