Enabled C++11 for tests target

unittests/CMakeLists.txt

@@ -19,6 +19,16 @@ function(add_gtest)
   endforeach()
 endfunction()
 
+include(CheckCXXCompilerFlag)
+CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
+CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
+if(COMPILER_SUPPORTS_CXX11)
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+elseif(COMPILER_SUPPORTS_CXX0X)
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
+else()
+	message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
+endif()
 
 # add each test
 # todo: add  mixer_test sbus2_test st24_test sf0x_test

unittests/Makefile

@@ -1,7 +1,7 @@
 
 CC=g++
 CFLAGS=-I. -I../src/modules -I ../src/include -I../src/drivers \
-	-I../src -I../src/lib -D__EXPORT="" -Dnullptr="0" -lm
+	-I../src -I../src/lib -D__EXPORT="" -Dnullptr="0" -lm -std=c++11
 
 # Points to the root of Google Test, relative to where this file is.
 # Remember to tweak this if you move this file.