I am using boost, Qt and other libraries to develop some applications and using cmake as my make tool. To eliminate the problems earlier, I decided to turn on the strongest warning flags(thanks for mloskot)

if(MSVC)
  # Force to always compile with W4
  if(CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
    string(REGEX REPLACE "/W[0-4]" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
  else()
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4")
  endif()
elseif(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR
"${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
  # Update if necessary
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-long-long -pedantic")
endif()

So far so good, but this would trigger a lot of warnings about the libraries i am using too, is it possible to disable the warnings of specific folders, files or libraries by cmake?

Edit : I am talking about the usage of the 3rd party libraries.The examples are

G:\qt5\T-i386-ntvc\include\QtCore/qhash.h(81) : warning C4127: conditional expression is constant

G:\qt5\T-i386-ntvc\include\QtCore/qlist.h(521) : warning C4127: conditional expression is constant
        G:\qt5\T-i386-ntvc\include\QtCore/qlist.h(511) : while compiling class template member function 'void QList::append(const T &)'
        with
        [
            T=QString
        ]
        G:\qt5\T-i386-ntvc\include\QtCore/qstringlist.h(62) : see reference to class template instantiation 'QList' being compiled
        with
        [
            T=QString
        ]

and so on