On Mon, Aug 25, 2014 at 1:07 PM, David Cole via CMake <cmake@cmake.org> wrote:
> > Ah, thanks... Though, I think there may be a general disconnect here: > > that is, it seems likely that one would want to construct output with > > a pattern composed from generator expressions. > > ... > > While I gather from your comment that something like this might be > > possible in the future, is there some other general approach that can > > be taken with current CMake? > > > The "disconnect" is that generator expressions were bolted on top of > existing CMake functionality, and are not fully supported in all > contexts. The documentation for add_custom_command [1] explicitly says > "Arguments to COMMAND may use “generator expressions”" -- but it says > nothing about OUTPUT using them at all. > > I don't know if there's a strong reason behind not supporting them in > the OUTPUT clause... but I suspect if it was easy, it would have been > done already. > Brad suggests it's far from easy in this bug comment: http://public.kitware.com/Bug/view.php?id=12877#c28315 > > For now, any OUTPUT you need to specify will have to be done without > the use of generator expressions. In some cases, that means you need to > know what the behavior of CMake is (like the library file name in your > example), and duplicate it if you need it in the OUTPUT clause. So, no: > no general approach that I know of, but you can use CMAKE_CFG_INTDIR as > needed to separate the output of different config builds... > > (If I'm wrong here, I do hope somebody else more intimately involved > with generator expressions will chime in and correct me.) > > > HTH, > David C. > > > [1] http://www.cmake.org/cmake/help/v3.0/command/add_custom_command.html > Petr
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