On 01/29/2013 03:31 PM, Alexander Neundorf wrote: > On Tuesday 29 January 2013, Stephen Kelly wrote: >> Also, just to shortcut a possible discussion point - this issue is >> independent of whether tll() adds includes or a new command is added. If a >> downstream is using a new command before the upstream adds >> INTERFACE_INCLUDE_DIRECTORIES, the exact same issue comes up. Just to be >> clear. > > A new command could ... require keywords to denote whether the target is > supposed to be used only for linking or for linking and include dirs.
Yes, a new command could have syntax or keywords to select which pieces of the interface to use. If a requested piece does not exist then it is an error. If a non-requested piece exists it is not used anyway. This basically brings us back to the current (pre-usage-reqs) situation where every part is its own variable/command. It just puts everything inside the new command call instead of calls to separate commands. The proposed solution is to instead have upstreams use interface version numbers to decide what parts of the interface to populate based on the version that the downstream expects. This is simpler for downstreams, which is the goal of Steve's work. -Brad -- Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Follow this link to subscribe/unsubscribe: http://public.kitware.com/cgi-bin/mailman/listinfo/cmake-developers
