From cc813cd5f73ea37173ebda761ebdd4184bf99254 Mon Sep 17 00:00:00 2001
From: Andreas Sandberg <andreas.sandberg@arm.com>
Date: Sun, 21 Jun 2015 20:52:13 +0100
Subject: [PATCH] base: Add a warn_if macro

Add a warn if macro that is analogous to the panic_if and fatal_if.
---
 src/base/misc.hh | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/base/misc.hh b/src/base/misc.hh
index 5f89e5f1d..b62548eb2 100644
--- a/src/base/misc.hh
+++ b/src/base/misc.hh
@@ -218,6 +218,20 @@ extern bool want_hack, hack_verbose;
 #define hack_once(...) \
     cond_message_once(want_hack, std::cerr, "hack", hack_verbose, __VA_ARGS__)
 
+/**
+ * Conditional warning macro that checks the supplied condition and
+ * only prints a warning if the condition is true. Useful to replace
+ * if + warn.
+ *
+ * @param cond Condition that is checked; if true -> warn
+ * @param ...  Printf-based format string with arguments, extends printout.
+ */
+#define warn_if(cond, ...) \
+    do { \
+        if ((cond)) \
+            warn(__VA_ARGS__); \
+    } while (0)
+
 /**
  * The chatty assert macro will function like a normal assert, but will allow the
  * specification of additional, helpful material to aid debugging why the
-- 
2.30.2