> if I (accidentally, or through ignorance) write code that would only work in > CMake 3.x but not in 2.8.12, will the build fail or should I make sure to > install 2.8.12 and test using that? .... if I ended up using an entirely new > command that did not exist at the time of 2.8.12, but does exist in 3.10 of > my installed CMake, should the build fail or succeed?
The in both cases if you have CMake 3.X installed the configure/generate of your project will succeed. You will need to install CMake 2.8.12 and test with that. > Policy logic You are correct about policy guards allowing older versions of CMake to safely ignore policies from new releases, while people running newer versions of CMake can leverage those ( generally the performance related policies ). On Tue, Apr 3, 2018 at 12:38 PM, Stephen McDowell <sjm...@cornell.edu> wrote: > Hello, > > Suppose I have a cmake_minimum_required(VERSION 2.8.12) project I would like > to contribute to. > > So when I am testing code for a v2.8.12 project, but my installed CMake > version is say 3.10, if I (accidentally, or through ignorance) write code > that would only work in CMake 3.x but not in 2.8.12, will the build fail or > should I make sure to install 2.8.12 and test using that? > > For example, my understanding is that for things like policies, I can do > > if (POLICY CMP<NNNN>) > cmake_policy(SET CMP<NNNN> NEW) > endif() > > and this will mean that an older version of CMake running this code that > does not know about policy NNNN will still work. But if I ended up using an > entirely new command that did not exist at the time of 2.8.12, but does > exist in 3.10 of my installed CMake, should the build fail or succeed? > > Thanks for any guidance, I’m sorry if this question doesn’t make any sense… > > -Stephen > > > -- > > Powered by www.kitware.com > > Please keep messages on-topic and check the CMake FAQ at: > http://www.cmake.org/Wiki/CMake_FAQ > > Kitware offers various services to support the CMake community. For more > information on each offering, please visit: > > CMake Support: http://cmake.org/cmake/help/support.html > CMake Consulting: http://cmake.org/cmake/help/consulting.html > CMake Training Courses: http://cmake.org/cmake/help/training.html > > Visit other Kitware open-source projects at > http://www.kitware.com/opensource/opensource.html > > Follow this link to subscribe/unsubscribe: > https://cmake.org/mailman/listinfo/cmake > -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: https://cmake.org/mailman/listinfo/cmake
