common changes in windows build

cmake/EthCompilerSettings.cmake

@@ -3,15 +3,16 @@
 
 # C++11 check and activation
 if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
+	set(CMAKE_CXX_FLAGS "-std=c++11 -Wall -Wno-unknown-pragmas -Wextra -DSHAREDLIB")
 	execute_process(
 		COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION)
 	if (NOT (GCC_VERSION VERSION_GREATER 4.7 OR GCC_VERSION VERSION_EQUAL 4.7))
 		message(FATAL_ERROR "${PROJECT_NAME} requires g++ 4.7 or greater.")
 	endif ()
 elseif ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
+	set(CMAKE_CXX_FLAGS "-std=c++11 -Wall -Wno-unknown-pragmas -Wextra -DSHAREDLIB")
 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
+	set(CMAKE_CXX_FLAGS "-std=c++11 -Wall -DSHAREDLIB")
 else ()
 	message(FATAL_ERROR "Your C++ compiler does not support C++11. You have ${CMAKE_CXX_COMPILER_ID}")
 endif ()
@@ -19,7 +20,7 @@ endif ()
 
 
 # Initialize CXXFLAGS
-set(CMAKE_CXX_FLAGS                "-std=c++11 -Wall -Wno-unknown-pragmas -Wextra -DSHAREDLIB")
+# CMAKE_CXX_FLAGS was set before
 set(CMAKE_CXX_FLAGS_DEBUG          "-O0 -g -DETH_DEBUG")
 set(CMAKE_CXX_FLAGS_MINSIZEREL     "-Os -DNDEBUG -DETH_RELEASE")
 set(CMAKE_CXX_FLAGS_RELEASE        "-O4 -DNDEBUG -DETH_RELEASE")