c++: adjust testcase to reveal failure [PR107919]

This test appeared to be passing, but only because the warning was
suppressed by #pragma system_header.

	PR tree-optimization/107919

gcc/testsuite/ChangeLog:

	* g++.dg/warn/Wuninitialized-pr107919-1.C: Add -Wsystem-headers and
	xfail.

diff --git a/gcc/testsuite/g++.dg/warn/Wuninitialized-pr107919-1.C b/gcc/testsuite/g++.dg/warn/Wuninitialized-pr107919-1.C
index 067a44a462e1fe93cc79a76d50478458123c6d13..049fa4d307ae956bc5a535011463594a8082ee44 100644 (file)
--- a/gcc/testsuite/g++.dg/warn/Wuninitialized-pr107919-1.C
+++ b/gcc/testsuite/g++.dg/warn/Wuninitialized-pr107919-1.C
@@ -1,6 +1,6 @@
 // { dg-do compile }
 // { dg-require-effective-target c++17 }
-// { dg-options "-O2 -Wuninitialized" }
+// { dg-options "-O2 -Wuninitialized -Wsystem-headers" }
 
 #include <memory>
 #include <variant>
@@ -13,3 +13,5 @@ void do_something(void* storage)
   auto& swappedValue = *reinterpret_cast<Event*>(storage);
   std::swap(event, swappedValue);
 }
+
+// { dg-bogus "may be used uninitialized" "" { xfail *-*-* } 0 }