Resolve all C++ -O2 warnings

include/etl/utility.h

@@ -132,7 +132,7 @@ namespace etl
 #endif
 
   // We can't have std::swap and etl::swap templates coexisting in the unit tests
-  // as the compiler will be unable to decide of which one to use, due to ADL.
+  // as the compiler will be unable to decide which one to use, due to ADL.
 #if ETL_NOT_USING_STL && !defined(ETL_IN_UNIT_TEST)
   //***************************************************************************
   // swap

test/CMakeLists.txt

@@ -342,17 +342,27 @@ if (ETL_OPTIMISATION MATCHES "-O3")
 endif()
 
 if ((CMAKE_CXX_COMPILER_ID MATCHES "MSVC"))
+	message(STATUS "Using MSVC compiler")
 	target_compile_options(etl_tests
 			PRIVATE
 			/Zc:__cplusplus
 			)
 endif ()
 
+if (CMAKE_CXX_COMPILER_ID MATCHES "GNU")
+	message(STATUS "Using GCC compiler")
+endif ()
+
+if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+    message(STATUS "Using Clang compiler")
+endif ()
+
 if ((CMAKE_CXX_COMPILER_ID MATCHES "GNU") OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang"))
 	target_compile_options(etl_tests
 			PRIVATE
 			-fno-omit-frame-pointer
 			-fno-common
+			-Werror=maybe-uninitialized
 			-Wall
 			-Wextra
 			-Werror