#ifndef _BABELTRACE_INTERNAL_H
#define _BABELTRACE_INTERNAL_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
#define bt_max_t(type, a, b) \
((type) (a) > (type) (b) ? (type) (a) : (type) (b))
_ref; \
})
+/*
+ * Copied from:
+ * <https://stackoverflow.com/questions/37411809/how-to-elegantly-fix-this-unused-variable-warning/37412551#37412551>:
+ *
+ * * sizeof() ensures that the expression is not evaluated at all, so
+ * its side-effects don't happen. That is to be consistent with the
+ * usual behaviour of debug-only constructs, such as assert().
+ *
+ * * `((_expr), 0)` uses the comma operator to swallow the actual type
+ * of `(_expr)`. This is to prevent VLAs from triggering evaluation.
+ *
+ * * `(void)` explicitly ignores the result of `(_expr)` and sizeof() so
+ * no "unused value" warning appears.
+ */
+
+#define BT_USE_EXPR(_expr) ((void) sizeof((void) (_expr), 0))
+#define BT_USE_EXPR2(_expr1, _expr2) \
+ ((void) sizeof((void) (_expr1), (void) (_expr2), 0))
+#define BT_USE_EXPR3(_expr1, _expr2, _expr3) \
+ ((void) sizeof((void) (_expr1), (void) (_expr2), (void) (_expr3), 0))
+#define BT_USE_EXPR4(_expr1, _expr2, _expr3, _expr4) \
+ ((void) sizeof((void) (_expr1), (void) (_expr2), \
+ (void) (_expr3), (void) (_expr4), 0))
+#define BT_USE_EXPR5(_expr1, _expr2, _expr3, _expr4, _expr5) \
+ ((void) sizeof((void) (_expr1), (void) (_expr2), \
+ (void) (_expr3), (void) (_expr4), (void) (_expr5), 0))
+
+#ifdef __cplusplus
+}
+#endif
+
#endif