chore: require CMake 3.14+ (#1182)

3.15 is a good minimum these days, and what pybind11, etc. now use.
(Edit: we are using some really old docker containers, so let's do 3.14+
for now).

---------

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 3.10+ (if already setup)"
+description: "Runs CMake 3.14+ (if already setup)"
 inputs:
   args:
     description: "Other arguments"

.github/workflows/tests.yml

@@ -265,36 +265,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Check CMake 3.10
+      - name: Check CMake 3.14
         uses: ./.github/actions/quick_cmake
         with:
-          cmake-version: "3.10"
+          cmake-version: "3.14"
-        if: success() || failure()
-
-      - name: Check CMake 3.11
-        uses: ./.github/actions/quick_cmake
-        with:
-          cmake-version: "3.11"
-        if: success() || failure()
-
-      - name: Check CMake 3.12
-        uses: ./.github/actions/quick_cmake
-        with:
-          cmake-version: "3.12"
-        if: success() || failure()
-
-      - name: Check CMake 3.13
-        uses: ./.github/actions/quick_cmake
-        with:
-          cmake-version: "3.13"
-        if: success() || failure()
-
-      - name: Check CMake 3.14.7
-        uses: ./.github/actions/quick_cmake
-        with:
-          cmake-version: "3.14.7"
           args: -DCLI11_SANITIZERS=ON -DCLI11_BUILD_EXAMPLES_JSON=ON
-        if: success() || failure()
 
       - name: Check CMake 3.15
         uses: ./.github/actions/quick_cmake
@@ -318,7 +293,6 @@ jobs:
         uses: ./.github/actions/quick_cmake
         with:
           cmake-version: "3.17"
-        if: success() || failure()
 
       - name: Check CMake 3.18
         uses: ./.github/actions/quick_cmake

CMakeLists.txt

@@ -1,5 +1,5 @@
-cmake_minimum_required(VERSION 3.10...4.0)
+cmake_minimum_required(VERSION 3.14...4.0)
-# Note: this is a header only library. If you have an older CMake than 3.10,
+# Note: this is a header only library. If you have an older CMake than 3.14,
 # just add the CLI11/include directory and that's all you need to do.
 
 set(VERSION_REGEX "#define CLI11_VERSION[ \t]+\"(.+)\"")
@@ -39,16 +39,13 @@ endif()
 include(CMakeDependentOption)
 include(GNUInstallDirs)
 
-if(NOT CMAKE_VERSION VERSION_LESS 3.11)
+include(FetchContent)
-  include(FetchContent)
-endif()
 
 list(APPEND force-libcxx "CMAKE_CXX_COMPILER_ID STREQUAL \"Clang\"")
 list(APPEND force-libcxx "CMAKE_SYSTEM_NAME STREQUAL \"Linux\"")
 list(APPEND force-libcxx "CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME")
 
 list(APPEND build-docs "CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME")
-list(APPEND build-docs "NOT CMAKE_VERSION VERSION_LESS 3.11")
 list(APPEND build-docs "Doxygen_FOUND")
 
 # Necessary to support paths with spaces, see #457

book/code/CMakeLists.txt

@@ -1,8 +1,8 @@
-cmake_minimum_required(VERSION 3.11...3.31)
+cmake_minimum_required(VERSION 3.14...4.0)
 
 project(CLI11_Examples LANGUAGES CXX)
 
-# Using CMake 3.11's ability to set imported interface targets
+# Using CMake ability to set imported interface targets
 add_library(CLI11::CLI11 IMPORTED INTERFACE)
 target_include_directories(CLI11::CLI11 INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}/../../include")
 target_compile_features(CLI11::CLI11 INTERFACE cxx_std_11)

cmake/CLI11Warnings.cmake

@@ -32,6 +32,4 @@ target_compile_options(
             $<$<NOT:$<CXX_COMPILER_ID:MSVC>>:${unix-warnings}
             $<$<BOOL:${CLI11_WARNINGS_AS_ERRORS}>:-Werror>>)
 
-if(NOT CMAKE_VERSION VERSION_LESS 3.13)
+target_link_options(CLI11_warnings INTERFACE $<$<BOOL:${CLI11_FORCE_LIBCXX}>:-stdlib=libc++>)
-  target_link_options(CLI11_warnings INTERFACE $<$<BOOL:${CLI11_FORCE_LIBCXX}>:-stdlib=libc++>)
-endif()

single-include/CMakeLists.txt

@@ -1,16 +1,9 @@
 if(CLI11_SINGLE_FILE)
   # Single file test
-  if(CMAKE_VERSION VERSION_LESS 3.12)
+  find_package(
-    find_package(PythonInterp REQUIRED)
+    Python
-    add_executable(Python::Interpreter IMPORTED)
+    COMPONENTS Interpreter
-    set_target_properties(Python::Interpreter PROPERTIES IMPORTED_LOCATION "${PYTHON_EXECUTABLE}"
+    REQUIRED)
-                                                         VERSION "${PYTHON_VERSION_STRING}")
-  else()
-    find_package(
-      Python
-      COMPONENTS Interpreter
-      REQUIRED)
-  endif()
 
   file(MAKE_DIRECTORY "${PROJECT_BINARY_DIR}/single-include")
   add_custom_command(

tests/CMakeLists.txt

@@ -1,4 +1,4 @@
-if(CLI11_SANITIZERS AND ${CMAKE_VERSION} VERSION_GREATER "3.15.0")
+if(CLI11_SANITIZERS AND ${CMAKE_VERSION} VERSION_GREATER "3.15")
   message(STATUS "Using arsenm/sanitizers-cmake")
   FetchContent_Declare(
     sanitizers
@@ -320,7 +320,7 @@ if(CLI11_INSTALL_PACKAGE_TESTS)
 
   file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/find_package_tests")
 
-  if(MSVC AND ${CMAKE_VERSION} VERSION_GREATER 3.12.9)
+  if(MSVC)
     # Tests for other CMake projects including and using CLI11 using find_package
     add_test(
       NAME find-package-testsA

tests/find_package_tests/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.10...3.26)
+cmake_minimum_required(VERSION 3.14...4.0)
 
 project(CLI11-find-package-test)
 

tests/package_config_tests/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.10...3.26)
+cmake_minimum_required(VERSION 3.14...4.0)
 
 project(CLI11-package-config-test)