coroutines, testsuite: Fix co-ret-17-void-ret-coro.C.

This was a bad testcase, found with fsanitize=address; the final suspend
is 'suspend never' which flows off the end of the coroutine destroying
the promise and the frame.   At that point access via the handle is an
error.  Fixed by checking that the promise is destroyed via a global var.

gcc/testsuite/ChangeLog:

	* g++.dg/coroutines/torture/co-ret-17-void-ret-coro.C: Check for
	promise destruction via a global variable.

(cherry picked from commit f6615c213354fd3ec7fc6238e61cc26bb1830464)

diff --git a/gcc/testsuite/g++.dg/coroutines/torture/co-ret-17-void-ret-coro.C b/gcc/testsuite/g++.dg/coroutines/torture/co-ret-17-void-ret-coro.C
index 3168ea272c18bbded90ab993215de1aa7fe7fa1c..01a75c1905dbf60d056ec9bde2f10e0cf31dcdb3 100644 (file)
--- a/gcc/testsuite/g++.dg/coroutines/torture/co-ret-17-void-ret-coro.C
+++ b/gcc/testsuite/g++.dg/coroutines/torture/co-ret-17-void-ret-coro.C
@@ -5,14 +5,17 @@
 
 #include "../coro.h"
 
+int g_promise = -1;
+
 template<typename R, typename HandleRef, typename ...T>
 struct std::coroutine_traits<R, HandleRef, T...> {
     struct promise_type {
         promise_type (HandleRef h, T ...args)
         { h = std::coroutine_handle<promise_type>::from_promise (*this);
           PRINT ("Created Promise");
+          g_promise = 1;
         }
-
+       ~promise_type () { PRINT ("Destroyed Promise"); g_promise = 0;}
         void get_return_object() {}
 
         auto initial_suspend() {
@@ -45,10 +48,11 @@ int main ()
 
   // initial suspend.
   h.resume ();
-  
-  if (!h.done())
+
+  // The coro should have self-destructed.
+  if (g_promise)
     {
-      PRINT ("main: apparently wasn't done...");
+      PRINT ("main: apparently we did not complete...");
       abort ();
     }