Up Minimum CMake Version to 3.20

docs/workflow/requirements/linux-requirements.md

@@ -40,20 +40,24 @@ Install the following packages for the toolchain:
 * zlib1g-dev
 * ninja-build (optional, enables building native code with ninja instead of make)
 
-**NOTE**: If you have an Ubuntu version older than 22.04 LTS, don't install `cmake` using `apt`. Follow the note written down below.
+**NOTE**: If you have an Ubuntu version older than 22.04 LTS, don't install `cmake` using `apt` directly. Follow the note written down below.
 
 ```bash
 sudo apt install -y cmake llvm lld clang build-essential \
 python-is-python3 curl git lldb libicu-dev liblttng-ust-dev \
 libssl-dev libkrb5-dev zlib1g-dev ninja-build
 ```
 
-**NOTE**: As of now, `apt` only has until CMake version 3.16.3 if you're using Ubuntu 20.04 LTS (or less in older Ubuntu versions), which is lower than the required 3.20. For this case, we use the `snap` package manager, which has version 3.26.4 at the time of writing:
+**NOTE**: As of now, Ubuntu's `apt` only has until CMake version 3.16.3 if you're using Ubuntu 20.04 LTS (or less in older Ubuntu versions), which is lower than the required 3.20. For this case, we can use the `snap` package manager or the _Kitware APT feed_ to get a new enough version of CMake.
+
+For snap:
 
 ```bash
 sudo snap install cmake
 ```
 
+For the _Kitware APT feed_, follow its [instructions here](https://apt.kitware.com/).
+
 You now have all the required components.
 
 #### Additional Requirements for Cross-Building

docs/workflow/requirements/windows-requirements.md

@@ -53,6 +53,8 @@ These steps are required only in case the tools have not been installed as Visua
 
 The _dotnet/runtime_ repository requires using CMake 3.20 or newer.
 
+**NOTE**: If you plan on using the `-msbuild` flag for building the repo, you will need version 3.21 at least. This is because the VS2022 generator doesn't exist in CMake until said version.
+
 #### Ninja
 
 * Install Ninja in one of the three following ways

src/native/corehost/CMakeLists.txt

@@ -1,8 +1,5 @@
-cmake_minimum_required(VERSION 3.6.2)
-
-if (CMAKE_VERSION VERSION_GREATER 3.15 OR CMAKE_VERSION VERSION_EQUAL 3.15)
-    cmake_policy(SET CMP0091 NEW)
-endif()
+cmake_minimum_required(VERSION 3.20)
+cmake_policy(SET CMP0091 NEW)
 
 project(corehost)
 

src/native/external/libunwind/CMakeLists.txt

@@ -1,6 +1,6 @@
 project(libunwind)
 
-cmake_minimum_required(VERSION 3.16.1)
+cmake_minimum_required(VERSION 3.20)
 
 set(CMAKE_C_STANDARD 11)
 

src/native/external/llvm-libunwind/CMakeLists.txt

@@ -2,7 +2,7 @@
 # Setup Project
 #===============================================================================
 
-cmake_minimum_required(VERSION 3.13.4)
+cmake_minimum_required(VERSION 3.20)
 
 set(LLVM_COMMON_CMAKE_UTILS "${CMAKE_CURRENT_SOURCE_DIR}/../cmake")
 

src/native/external/zlib/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.4.4)
+cmake_minimum_required(VERSION 3.20)
 set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS ON)
 
 project(zlib C)