[CMake] Disable warnings in Visual Studio Express 2008

[user790 user790]

Disabling specific warnings is a simple task so I thought I could do it
myself but I must admit defeat. A simple CMakeLists.txt like this won't
work.

project(testcmake)
# None of this works
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4669")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4669" CACHE STRING "Compilation
flags" FORCE)
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -wd4669")
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -wd4669" CACHE STRING "Compilation
flags" FORCE)
add_executable(foo foo.cxx)

I have tried the same variants with COMPILE_FLAGS and CMAKE_CXX_FLAGS_DEBUG
/ RELEASE with the same unsuccess.

I only have VS Express 2008 so I can't check whether I am doing something
wrong or if there is some issue with this particular IDE -- not even sure if
it is explicitely not supported.

Thanks for your help,

Tom
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