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December 30, 2018 21:29
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cmake 3.12
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| This is for cmake 3.12+ to retain old behaviour: | |
| https://cmake.org/cmake/help/v3.13/policy/CMP0077.html?highlight=policy#policy:CMP0077 | |
| By adding the following lines to a root CMakeLists.txt it is easier to use it from another cmake project (using add_subdirectory). | |
| if (POLICY CMP0077) | |
| cmake_policy(SET CMP0077 NEW) | |
| endif() | |
| That way it is possible to hide and set option variables from the outer Cmake-script like it use to be possible before cmake 3.12. | |
| This can't be set in the project that calls add_subdirectory since cmake_minimum_required resets policies. |
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If I have a project A that does add_subdirectory(meshoptimizer) it is nice to be able to just set say variable BUILD_DEMO first.
In old cmake it made the variable disappear as a cached variable to the outside (and show up in say cmake-gui).
As of cmake 3.12 you have to activate new behaviour for CMP077 in meshoptimzier to retain this behaviour.
If it is not set the BUILD_DEMO-variable from outside will be ignored and the varaible will be cached and show up in cmake-gui.