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Code Issues Releases Wiki Activity

Adding warning

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Henry Fredrick Schreiner 2018-07-16 12:48:56 +02:00
parent 6a52473afb
commit 3d3b8f257a
1 changed files with 13 additions and 1 deletions
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14
chapters/basics.md
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@ -22,12 +22,24 @@ This is what new projects should do:
cmake_minimum_required(VERSION 3.1...3.11)
if(${CMAKE_VERSION} VERSION_LESS 3.12)
cmake_policy(VERSION ${CMAKE_VERSION})
cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
endif()
```
If CMake version is less than 3.12, the if block will be true, and the policy will be set to the current CMake version. If CMake is 3.12 or higher, the if block will be false, but the new syntax in `cmake_minimum_required` will be respected and this will continue to work properly!
WARNING: MSVC's CMake [seems to have a bug](https://github.com/fmtlib/fmt/issues/809) in reading this format, so if you need to support non-command line Windows builds, you will want to do this instead:
```cmake
cmake_minimum_required(VERSION 3.1)
if(${CMAKE_VERSION} VERSION_LESS 3.11)
cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
else()
cmake_policy(VERSION 3.11)
endif()
```
{% hint style='info' %}
If you really need to set to a low value here, you can use «command:`cmake_policy`» to conditionally increase the policy level or set a specific policy. Please at least do this for your macOS users!