Fixes the following with Clang 16:
```
-warning: a function definition without a prototype is deprecated in all
versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
+error: a function definition without a prototype is deprecated in all versions
of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
int foo(i)
^
```
---
m4/labels-as-values.m4 | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/m4/labels-as-values.m4 b/m4/labels-as-values.m4
index e01768f00..f2f38858e 100644
--- a/m4/labels-as-values.m4
+++ b/m4/labels-as-values.m4
@@ -2,7 +2,7 @@ dnl check for gcc's "labels as values" feature
AC_DEFUN([AC_C_LABELS_AS_VALUES],
[AC_CACHE_CHECK([labels as values], ac_cv_labels_as_values,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-int foo(int);
+int foo(int i);
int foo(int i) {
static void *label[] = { &&l1, &&l2 };
goto *label[i];
--
2.38.1
