1 files changed, 35 insertions, 0 deletions
diff --git a/libio/tst-wmemstream1.c b/libio/tst-wmemstream1.c
index f8b308bc6c..f80655b2a4 100644
--- a/libio/tst-wmemstream1.c
+++ b/libio/tst-wmemstream1.c
@@ -1,5 +1,40 @@
 #include <wchar.h>
 
+extern int fclose (FILE*);
+
+#if defined __GNUC__ && __GNUC__ >= 11
+/* Verify that calling fclose on the result of open_wmemstream doesn't
+   trigger GCC -Wmismatched-dealloc with fclose forward-declared and
+   without <stdio.h> included first (it is included later, in.
+   "tst-memstream1.c").  */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic error "-Wmismatched-dealloc"
+#endif
+
+int test_open_wmemstream_no_stdio (void)
+{
+  {
+    wchar_t *buf;
+    size_t size;
+    FILE *f = open_wmemstream (&buf, &size);
+    fclose (f);
+  }
+
+  {
+    FILE* (*pf)(wchar_t**, size_t*) = open_wmemstream;
+    wchar_t *buf;
+    size_t size;
+    FILE *f = pf (&buf, &size);
+    fclose (f);
+  }
+  return 0;
+}
+
+#if defined __GNUC__ && __GNUC__ >= 11
+/* Restore -Wmismatched-dealloc setting.  */
+# pragma GCC diagnostic pop
+#endif
+
 #define CHAR_T wchar_t
 #define W(o) L##o
 #define OPEN_MEMSTREAM open_wmemstream