004-tools-cmake.md

# Proposal: Tools - CMake 3.15

| **Status**        | **Accepted**                                      |
|:------------------|:--------------------------------------------------|
| **RFC #**         | [004](https://github.com/conan-io/tribe/pull/4)   |
| **Submitted**     | 2020-11-12                                        |
| **Tribe votes**   | :thumbsup: (45) :thumbsdown: (7) :eyes: (5)       |

---

## Summary
Declare CMake 3.15 as the lowest supported CMake version.


## Motivation
CMake is one of the main external tool we call from Conan, transparent integration and
reliability should be a priority. It is important to declare a minimum supported
version so we can run all the tests and be confident that the user will get the
expected results and no regressions will be introduced.


## Proposal
CMake 3.15 was [released on July 2019](https://github.com/Kitware/CMake/releases/tag/v3.15.0). Significant additions are:

 * (CMake 3.14) _Visual Studio 16 2019_ generator.
 * Variable `CMAKE_PROJECT_INCLUDE` to add a file to be included after the `project()`
   call. This is used by Conan toolchains.
 * Variable `CMAKE_MSVC_RUNTIME_LIBRARY` to select the runtime library library used 
   when targeting MSVC ABI.
 
[Link to the full changelog](https://cmake.org/cmake/help/latest/release/3.15.html).