Make CASSERT() macro callable from anywhere
The CASSERT() macro introduces a typedef for the sole purpose of
triggering a compilation error if the condition to check is false.
This typedef is not used afterwards. As a consequence, when the
CASSERT() macro is called from withing a function block, the compiler
complains and outputs the following error message:
error: typedef 'msg' locally defined but not used [-Werror=unused-local-typedefs]
This patch adds the "unused" attribute for the aforementioned
typedef. This silences the compiler warning and thus makes the
CASSERT() macro callable from within function blocks as well.
Change-Id: Ie36b58fcddae01a21584c48bb6ef43ec85590479
diff --git a/include/lib/cassert.h b/include/lib/cassert.h
index 0e5529d..e8089cb 100644
--- a/include/lib/cassert.h
+++ b/include/lib/cassert.h
@@ -34,9 +34,12 @@
/*******************************************************************************
* Macro to flag a compile time assertion. It uses the preprocessor to generate
* an invalid C construct if 'cond' evaluates to false.
- * The following compilation error is triggered if the assertion fails:
+ * The following compilation error is triggered if the assertion fails:
* "error: size of array 'msg' is negative"
+ * The 'unused' attribute ensures that the unused typedef does not emit a
+ * compiler warning.
******************************************************************************/
-#define CASSERT(cond, msg) typedef char msg[(cond) ? 1 : -1]
+#define CASSERT(cond, msg) \
+ typedef char msg[(cond) ? 1 : -1] __attribute__((unused))
#endif /* __CASSERT_H__ */