test: fix GCC 16 compile error

adrianreber · avagin · commit fb59ae504e90 · 2026-01-12T19:06:43.000-08:00
Fedora rawhide ships a pre-release of GCC 16 which produces following
error:

  uprobes.c:34:22: error: variable ‘dummy’ set but not used [-Werror=unused-but-set-variable=]
  34 |         volatile int dummy = 0;
  |                      ^~~~~

Marking this variable as "__maybe_unused" to fix the error.

Signed-off-by: Adrian Reber &lt;areber@redhat.com&gt;
diff --git a/test/zdtm/static/uprobes.c b/test/zdtm/static/uprobes.c
@@ -31,7 +31,7 @@ const char *test_author = "Shashank Balaji <shashank.mahadasyam@sony.com>";
  * compiler optimization) and use it (to prevent "unused variable" warning)
  */
 void UPROBED_FUNCTION(void) {
-	volatile int dummy = 0;
+	volatile int dummy __maybe_unused = 0;
 	dummy += 1;
 }
 /* Calling via volatile function pointer ensures noinline at callsite */

Original file line number	Diff line number	Diff line change
`@@ -31,7 +31,7 @@ const char *test_author = "Shashank Balaji <shashank.mahadasyam@sony.com>";`
`31`	`31`	`* compiler optimization) and use it (to prevent "unused variable" warning)`
`32`	`32`	`*/`
`33`	`33`	`void UPROBED_FUNCTION(void) {`
`34`		`- volatile int dummy = 0;`
	`34`	`+ volatile int dummy __maybe_unused = 0;`
`35`	`35`	`dummy += 1;`
`36`	`36`	`}`
`37`	`37`	`/* Calling via volatile function pointer ensures noinline at callsite */`