build: bump minimum cmake version to 3.16

.github/workflows/build.yml

@@ -41,8 +41,8 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 15
     env:
-      CMAKE_URL: 'https://cmake.org/files/v3.13/cmake-3.13.0-Linux-x86_64.sh'
-      CMAKE_VERSION: '3.13.0'
+      CMAKE_URL: 'https://cmake.org/files/v3.16/cmake-3.16.0-Linux-x86_64.sh'
+      CMAKE_VERSION: '3.16.0'
     steps:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/setup

BUILD.md

@@ -283,7 +283,7 @@ cmake --build build
 General requirements (see [#1469](https://github.com/neovim/neovim/issues/1469#issuecomment-63058312)):
 
 - Clang or GCC version 4.9+
-- CMake version 3.13+, built with TLS/SSL support
+- CMake version 3.16+, built with TLS/SSL support
   - Optional: Get the latest CMake from an [installer](https://github.com/Kitware/CMake/releases) or the [Python package](https://pypi.org/project/cmake/) (`pip install cmake`)
 
 Platform-specific requirements are listed below.

CMakeLists.txt

@@ -6,12 +6,7 @@
 #     - variable_watch https://cmake.org/cmake/help/latest/command/variable_watch.html
 
 # Version should match the tested CMAKE_URL in .github/workflows/build.yml.
-cmake_minimum_required(VERSION 3.13)
-
-# Can be removed once minimum version is at least 3.15
-if(POLICY CMP0092)
-  cmake_policy(SET CMP0092 NEW)
-endif()
+cmake_minimum_required(VERSION 3.16)
 
 project(nvim C)
 

cmake.config/CMakeLists.txt

@@ -173,9 +173,7 @@ function(append_target_expression)
     ${ARGN})
 
   set(TARGET_EXPRESSION "$<TARGET_PROPERTY:nvim_bin,${ARG_PROPERTY}>")
-  if(${CMAKE_VERSION} VERSION_GREATER_EQUAL 3.15)
-    set(TARGET_EXPRESSION "$<REMOVE_DUPLICATES:${TARGET_EXPRESSION}>")
-  endif()
+  set(TARGET_EXPRESSION "$<REMOVE_DUPLICATES:${TARGET_EXPRESSION}>")
   set(TARGET_EXPRESSION "${ARG_PREFIX}$<JOIN:${TARGET_EXPRESSION}, ${ARG_PREFIX}>")
 
   set(VERSION_STRING "${VERSION_STRING} ${TARGET_EXPRESSION} " PARENT_SCOPE)

cmake.deps/CMakeLists.txt

@@ -1,5 +1,5 @@
 # This is not meant to be included by the top-level.
-cmake_minimum_required (VERSION 3.13)
+cmake_minimum_required (VERSION 3.16)
 project(NVIM_DEPS C)
 
 if(POLICY CMP0135)

cmake.deps/cmake/GettextCMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.13)
+cmake_minimum_required(VERSION 3.16)
 project(gettext C)
 
 add_compile_options(-w)

cmake.deps/cmake/LibiconvCMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.13)
+cmake_minimum_required(VERSION 3.16)
 project(libiconv C)
 
 add_compile_options(-w)

cmake.deps/cmake/LpegCMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.13)
+cmake_minimum_required(VERSION 3.16)
 project (lpeg C)
 
 include(GNUInstallDirs)

cmake.deps/cmake/MarkdownParserCMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.13)
+cmake_minimum_required(VERSION 3.16)
 project(${PARSERLANG} C)
 
 add_compile_options(-w)

cmake.deps/cmake/TreesitterCMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.13)
+cmake_minimum_required(VERSION 3.16)
 project(treesitter C)
 
 add_compile_options(-w)

cmake.deps/cmake/TreesitterParserCMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.13)
+cmake_minimum_required(VERSION 3.16)
 project(parser C)
 
 add_compile_options(-w)