From c094c232eb3246154265bb035182f92fe1b17ab8 Mon Sep 17 00:00:00 2001
From: Martin Sebor <msebor@redhat.com>
Date: Tue, 25 Jan 2022 15:39:38 -0700
Subject: Avoid -Wuse-after-free in tests [BZ #26779].

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
---
 malloc/tst-malloc-backtrace.c | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'malloc/tst-malloc-backtrace.c')

diff --git a/malloc/tst-malloc-backtrace.c b/malloc/tst-malloc-backtrace.c
index ea66da23ef..65e1a1ffbc 100644
--- a/malloc/tst-malloc-backtrace.c
+++ b/malloc/tst-malloc-backtrace.c
@@ -20,6 +20,7 @@
 #include <stdlib.h>
 
 #include <support/support.h>
+#include <libc-diag.h>
 
 #define SIZE 4096
 
@@ -29,7 +30,15 @@ __attribute__((noinline))
 call_free (void *ptr)
 {
   free (ptr);
+#if __GNUC_PREREQ (12, 0)
+  /* Ignore a valid warning about using a pointer made indeterminate
+     by a prior call to free().  */
+  DIAG_IGNORE_NEEDS_COMMENT (12, "-Wuse-after-free");
+#endif
   *(size_t *)(ptr - sizeof (size_t)) = 1;
+#if __GNUC_PREREQ (12, 0)
+  DIAG_POP_NEEDS_COMMENT;
+#endif
 }
 
 int
-- 
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