feat: increase min CMake to 3.10 (#1084)

Close https://github.com/CLIUtils/CLI11/issues/1082.

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

.github/actions/quick_cmake/action.yml

@@ -1,5 +1,5 @@
 name: Quick CMake config
-description: "Runs CMake 3.5+ (if already setup)"
+description: "Runs CMake 3.10+ (if already setup)"
 inputs:
   args:
     description: "Other arguments"

.github/workflows/tests.yml

@@ -238,36 +238,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Check CMake 3.5
-        uses: ./.github/actions/quick_cmake
-        with:
-          cmake-version: "3.5"
-        if: success() || failure()
-
-      - name: Check CMake 3.6
-        uses: ./.github/actions/quick_cmake
-        with:
-          cmake-version: "3.6"
-        if: success() || failure()
-
-      - name: Check CMake 3.7
-        uses: ./.github/actions/quick_cmake
-        with:
-          cmake-version: "3.7"
-        if: success() || failure()
-
-      - name: Check CMake 3.8
-        uses: ./.github/actions/quick_cmake
-        with:
-          cmake-version: "3.8"
-        if: success() || failure()
-
-      - name: Check CMake 3.9
-        uses: ./.github/actions/quick_cmake
-        with:
-          cmake-version: "3.9"
-        if: success() || failure()
-
       - name: Check CMake 3.10
         uses: ./.github/actions/quick_cmake
         with:
@@ -390,15 +360,21 @@ jobs:
           cmake-version: "3.28.X"
           args: -DCLI11_SANITIZERS=ON -DCLI11_BUILD_EXAMPLES_JSON=ON
         if: success() || failure()
-        
+
       - name: Check CMake 3.29
         uses: ./.github/actions/quick_cmake
         with:
           cmake-version: "3.29"
         if: success() || failure()
-        
+
       - name: Check CMake 3.30
         uses: ./.github/actions/quick_cmake
         with:
           cmake-version: "3.30"
         if: success() || failure()
+
+      - name: Check CMake 3.31
+        uses: ./.github/actions/quick_cmake
+        with:
+          cmake-version: "3.31"
+        if: success() || failure()

CMakeLists.txt

@@ -1,17 +1,7 @@
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.10...3.31)
 # Note: this is a header only library. If you have an older CMake than 3.5,
 # just add the CLI11/include directory and that's all you need to do.
 
-# Make sure users don't get warnings on a tested (3.5 to 3.30) version
-# of CMake. For most of the policies, the new version is better (hence the change).
-# We don't use the 3.5...3.30 syntax because of a bug in an older MSVC's
-# built-in and modified CMake 3.11
-if(${CMAKE_VERSION} VERSION_LESS 3.30)
-  cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
-else()
-  cmake_policy(VERSION 3.30)
-endif()
-
 set(VERSION_REGEX "#define CLI11_VERSION[ \t]+\"(.+)\"")
 
 # Read in the line containing the version
@@ -35,9 +25,7 @@ if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
 
   find_package(Doxygen)
 
-  if(CMAKE_VERSION VERSION_LESS 3.10)
+  if(NOT Doxygen_FOUND)
-    message(STATUS "CMake 3.10+ adds Doxygen support. Update CMake to build documentation")
-  elseif(NOT Doxygen_FOUND)
     message(STATUS "Doxygen not found, building docs has been disabled")
   endif()
 

README.md

@@ -179,7 +179,7 @@ details are available at [installation][]:
   separately.
 - All-in-one global header: Like above, but copying the file to a shared folder
   location like `/opt/CLI11`. Then, the C++ include path has to be extended to
-  point at this folder. With CMake 3.5+, use `include_directories(/opt/CLI11)`
+  point at this folder. With CMake 3.10+, use `include_directories(/opt/CLI11)`
 - For other methods including using CMake, conan or vcpkg and some specific
   instructions for GCC 8 or WASI see [installation][].
 

book/code/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.11)
+cmake_minimum_required(VERSION 3.11...3.31)
 
 project(CLI11_Examples LANGUAGES CXX)
 

src/CMakeLists.txt

@@ -33,21 +33,7 @@ target_include_directories(
   $<INSTALL_INTERFACE:include>)
 
 if(CMAKE_CXX_STANDARD LESS 14)
-  if(CMAKE_VERSION VERSION_LESS 3.8)
+  target_compile_features(CLI11 INTERFACE cxx_std_11)
-    # This might not be a complete list
-    target_compile_features(
-      CLI11
-      INTERFACE cxx_lambdas
-                cxx_nullptr
-                cxx_override
-                cxx_range_for
-                cxx_right_angle_brackets
-                cxx_strong_enums
-                cxx_constexpr
-                cxx_auto_type)
-  else()
-    target_compile_features(CLI11 INTERFACE cxx_std_11)
-  endif()
 endif()
 
 if(CLI11_INSTALL)