re PR c++/85108 (Incorrect warning for constexpr lambda with -Wunused-but-set-variable)

	PR c++/85108
	* g++.dg/warn/Wunused-var-31.C: New test.

From-SVN: r258952

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 89712e3..788dbaa 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2018-03-29  Jakub Jelinek  <jakub@redhat.com>
 
+       PR c++/85108
+       * g++.dg/warn/Wunused-var-31.C: New test.
+
        PR c/85094
        * c-c++-common/Wduplicated-branches-14.c: New test.
 

diff --git a/gcc/testsuite/g++.dg/warn/Wunused-var-31.C b/gcc/testsuite/g++.dg/warn/Wunused-var-31.C
new file mode 100644 (file)
index 0000000..74c016b
--- /dev/null
+++ b/gcc/testsuite/g++.dg/warn/Wunused-var-31.C
@@ -0,0 +1,11 @@
+// PR c++/85108
+// { dg-do compile { target c++17 } }
+// { dg-options "-Wunused-but-set-variable" }
+
+int
+main ()
+{
+  auto constexpr add = [] (auto a, auto b) { return a + b; };  // { dg-bogus "set but not used" }
+  auto test_lambda = [&] () { return add (2, 2); };
+  return test_lambda () - 4;
+}