double promotion warning fix or ignore per module

src/lib/controllib/BlockStats.hpp

@@ -89,7 +89,7 @@ public:
 	}
 	matrix::Vector<Type, M> getStdDev()
 	{
-		return getVar().pow(0.5);
+		return getVar().pow(0.5f);
 	}
 private:
 // attributes

src/lib/controllib/controllib_test/CMakeLists.txt

@@ -34,6 +34,7 @@ px4_add_module(
 	MODULE lib__controllib__controllib_test
 	MAIN controllib_test
 	COMPILE_FLAGS
+		-Wno-double-promotion # TODO: fix in Matrix library Vector::pow()
 	SRCS
 		controllib_test_main.cpp
 	DEPENDS