stupid warnings

Author: tom-pytel

Include/internal/pycore_pyatomic_ft_wrappers.h

@@ -158,7 +158,14 @@ extern "C" {
 #define FT_ATOMIC_STORE_LLONG_RELAXED(value, new_value) value = new_value
 #define FT_ATOMIC_LOAD_ULLONG_RELAXED(value) value
 #define FT_ATOMIC_STORE_ULLONG_RELAXED(value, new_value) value = new_value
-#define FT_ATOMIC_ADD_SSIZE(value, new_value) (value += new_value) - new_value
+
+static inline _FT_ATOMIC_ADD_SSIZE(Py_ssize_t *value, Py_ssize_t new_value)
+{
+    Py_ssize_t old_value = *value;
+    *value = old_value + new_value;
+    return old_value;
+}
+#define FT_ATOMIC_ADD_SSIZE(value, new_value) _FT_ATOMIC_ADD_SSIZE(&value, new_value)
 
 #endif