[CMake] Properly Detecting Win64

[James Bigler]

On Mon, Jan 17, 2011 at 11:27 AM, Michael Jackson <
mike.jackson at bluequartz.net> wrote:

>
> On Jan 17, 2011, at 1:23 PM, Eric Noulard wrote:
>
> > 2011/1/17 Michael Jackson <mike.jackson at bluequartz.net>:
> >> I have the following code:
> >>
> >> if ( "${CMAKE_SIZEOF_VOID_P}" EQUAL "8" )
> >>        set(CPACK_PACKAGE_FILE_NAME "${PROJECT_NAME}-Win64")
> >> elseif( "${CMAKE_SIZEOF_VOID_P}" EQUAL "4" )
> >>        set(CPACK_PACKAGE_FILE_NAME "${PROJECT_NAME}-Win32")
> >> else()
> >>        set(CPACK_PACKAGE_FILE_NAME "${PROJECT_NAME}-Unknown")
> >> endif()
> >>
> >> I properly generate VS 2008 Win64 projects. Everything builds fine. When
> I build the "PACKAGE" project I get a zip file with "-Unknown" in the name.
> This will usually configure OK the first time or so, ie, I get a Zip file
> name with "-Win64" but after a few more configs this seems to revert back to
> "Unknown". Searching the "CMakeCache.txt" file for "CMAKE_SIZEOF_VOID_P"
> comes up empty. Is this some sort of temporary variable?
> >
> > Shouldn't be "temporary" just "not in cache".
> >
> >> Do I need to store it in my own cache variable somewhere?
> >
> > I don't think you should.
> > Looks like a bug to me, how come CMAKE_SIZEOF_VOID_P
> > would it be defined "sometimes" but not **always**...
> >
> > need to dive into the source of this definition, may be it is not always
> > defined because it is "indirectly" defined in the chain of CMake
> processing due
> > to CMake cache.
> >
> > By the way shouldn't you use
> >
> > if (CMAKE_SIZEOF_VOID_P EQUAL 8)
> >
> > instead of
> >
> > if ( "${CMAKE_SIZEOF_VOID_P}" EQUAL "8" )
> >
> > from the doc I think EQUAL is for values whereas STREQUAL is for string.
> >
> >
> > --
> > Erk
> > Membre de l'April - « promouvoir et défendre le logiciel libre » -
> > http://www.april.org
>
> It seems like if I start with a clean build directory then
> CMAKE_SIZEOF_VOID_P will be the proper value for the environment I am
> running in. But then after a while (many runs of CMake) the value seems to
> get "lost" or otherwise is NOT in the cache any longer. Kind of odd really.
>
> You are probably right about the improper use of the "if" command. I never
> really know which one to use and when something does not work when I _think_
> it really *should* work then I start trying all sorts of stuff.
>
> Maybe someone else has some ideas as to why CMAKE_SIZEOF_VOID_P might not
> be defined.
> ___________________________________________________________
> Mike Jackson                      www.bluequartz.net
>
>
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I've also seen this, and I would appreciate if anyone else who experiences
this could chime in, so that we might be able to start profiling situations
where this comes up.  I don't remember how I fixed the problem last time,
though.

James
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