fix: increase min CMake to 3.5 (#898)

CMake 3.27 will start warning if this is older than 3.5.

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 3.4+ (if already setup)"
+description: "Runs CMake 3.5+ (if already setup)"
 inputs:
   args:
     description: "Other arguments"
@@ -13,7 +13,7 @@ runs:
   using: composite
   steps:
     - name: CMake ${{ inputs.cmake-version }}
-      uses: jwlawson/actions-setup-cmake@v1.13
+      uses: jwlawson/actions-setup-cmake@v1.14
       with:
         cmake-version: "${{ inputs.cmake-version }}"
     - run: |

.github/workflows/tests.yml

@@ -145,11 +145,6 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Check CMake 3.4
-        with:
-          cmake-version: "3.4"
-        uses: ./.github/actions/quick_cmake
-
       - name: Check CMake 3.5
         uses: ./.github/actions/quick_cmake
         with:
@@ -265,22 +260,34 @@ jobs:
           cmake-version: "3.22"
         if: success() || failure()
 
-      - name: Check CMake 3.23 
+      - name: Check CMake 3.23
         uses: ./.github/actions/quick_cmake
         with:
           cmake-version: "3.23"
         if: success() || failure()
 
-      - name: Check CMake 3.24 (full)
+      - name: Check CMake 3.24
         uses: ./.github/actions/quick_cmake
         with:
           cmake-version: "3.24"
-          args: -DCLI11_SANITIZERS=ON -DCLI11_BUILD_EXAMPLES_JSON=ON
         if: success() || failure()
 
-      - name: Check CMake 3.25 (full)
+      - name: Check CMake 3.25
         uses: ./.github/actions/quick_cmake
         with:
           cmake-version: "3.25"
+        if: success() || failure()
+
+      - name: Check CMake 3.26 (full)
+        uses: ./.github/actions/quick_cmake
+        with:
+          cmake-version: "3.26"
+          args: -DCLI11_SANITIZERS=ON -DCLI11_BUILD_EXAMPLES_JSON=ON
+        if: success() || failure()
+
+      - name: Check CMake 3.27 (full)
+        uses: ./.github/actions/quick_cmake
+        with:
+          cmake-version: "3.27"
           args: -DCLI11_SANITIZERS=ON -DCLI11_BUILD_EXAMPLES_JSON=ON
         if: success() || failure()

CMakeLists.txt

@@ -1,15 +1,15 @@
-cmake_minimum_required(VERSION 3.4)
+cmake_minimum_required(VERSION 3.5)
-# Note: this is a header only library. If you have an older CMake than 3.4,
+# 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 (3.4 to 3.24) version
+# Make sure users don't get warnings on a tested (3.5 to 3.26) version
 # of CMake. For most of the policies, the new version is better (hence the change).
-# We don't use the 3.4...3.24 syntax because of a bug in an older MSVC's
+# We don't use the 3.5...3.26 syntax because of a bug in an older MSVC's
 # built-in and modified CMake 3.11
-if(${CMAKE_VERSION} VERSION_LESS 3.25)
+if(${CMAKE_VERSION} VERSION_LESS 3.26)
   cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
 else()
-  cmake_policy(VERSION 3.25)
+  cmake_policy(VERSION 3.26)
 endif()
 
 set(VERSION_REGEX "#define CLI11_VERSION[ \t]+\"(.+)\"")

README.md

@@ -178,7 +178,7 @@ To use, there are several methods:
   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, use `include_directories(/opt/CLI11)`
+  point at this folder. With CMake 3.5+, use `include_directories(/opt/CLI11)`
 - Local headers and target: Use `CLI/*.hpp` files. You could check out the
   repository as a git submodule, for example. With CMake, you can use
   `add_subdirectory` and the `CLI11::CLI11` interface target when linking. If

book/chapters/installation.md

@@ -24,7 +24,7 @@ include shown above.
 
 ### CMake support for the full edition
 
-If you use CMake 3.4+ for your project (highly recommended), CLI11 comes with a
+If you use CMake 3.5+ for your project (highly recommended), CLI11 comes with a
 powerful CMakeLists.txt file that was designed to also be used with
 `add_subproject`. You can add the repository to your code (preferably as a git
 submodule), then add the following line to your project (assuming your folder is
@@ -43,7 +43,8 @@ You can also configure and optionally install CLI11, and CMake will create the
 necessary `lib/cmake/CLI11/CLI11Config.cmake` files, so
 `find_package(CLI11 CONFIG REQUIRED)` also works.
 
-If you use conan.io, CLI11 supports that too.
+If you use conan.io, CLI11 supports that too. CLI11 also supports Meson and
+pkg-config if you are not using CMake.
 
 ### Running tests on the full edition