feat: require CMake 3.15+

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

.github/CONTRIBUTING.md

@@ -81,7 +81,7 @@ nox -s build
 ### Full setup
 
 To setup an ideal development environment, run the following commands on a
-system with CMake 3.14+:
+system with CMake 3.15+:
 
 ```bash
 python3 -m venv venv
@@ -96,8 +96,8 @@ Tips:
 * You can use `virtualenv` (faster, from PyPI) instead of `venv`.
 * You can select any name for your environment folder; if it contains "env" it
   will be ignored by git.
-* If you don't have CMake 3.14+, just add "cmake" to the pip install command.
-* You can use `-DPYBIND11_FINDPYTHON=ON` to use FindPython on CMake 3.12+
+* If you don't have CMake 3.15+, just add "cmake" to the pip install command.
+* You can use `-DPYBIND11_FINDPYTHON=ON` to use FindPython.
 * In classic mode, you may need to set `-DPYTHON_EXECUTABLE=/path/to/python`.
   FindPython uses `-DPython_ROOT_DIR=/path/to` or
   `-DPython_EXECUTABLE=/path/to/python`.
@@ -149,8 +149,8 @@ To run the tests, you can "build" the check target:
 cmake --build build --target check
 ```
 
-`--target` can be spelled `-t` in CMake 3.15+. You can also run individual
-tests with these targets:
+`--target` can be spelled `-t`. You can also run individual tests with these
+targets:
 
 * `pytest`: Python tests only, using the
 [pytest](https://docs.pytest.org/en/stable/) framework

.github/workflows/configure.yml

@@ -31,15 +31,15 @@ jobs:
         include:
         - runs-on: ubuntu-20.04
           arch: x64
-          cmake: "3.5"
+          cmake: "3.15"
 
         - runs-on: ubuntu-20.04
           arch: x64
           cmake: "3.29"
 
         - runs-on: macos-13
           arch: x64
-          cmake: "3.8"
+          cmake: "3.15"
 
         - runs-on: windows-2019
           arch: x64 # x86 compilers seem to be missing on 2019 image

CMakeLists.txt

@@ -10,26 +10,15 @@ if(NOT CMAKE_VERSION VERSION_LESS "3.27")
   cmake_policy(GET CMP0148 _pybind11_cmp0148)
 endif()
 
-cmake_minimum_required(VERSION 3.5)
-
-# The `cmake_minimum_required(VERSION 3.5...3.29)` syntax does not work with
-# some versions of VS that have a patched CMake 3.11. This forces us to emulate
-# the behavior using the following workaround:
-if(${CMAKE_VERSION} VERSION_LESS 3.29)
-  cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
-else()
-  cmake_policy(VERSION 3.29)
-endif()
+cmake_minimum_required(VERSION 3.15...3.30)
 
 if(_pybind11_cmp0148)
   cmake_policy(SET CMP0148 ${_pybind11_cmp0148})
   unset(_pybind11_cmp0148)
 endif()
 
 # Avoid infinite recursion if tests include this as a subdirectory
-if(DEFINED PYBIND11_MASTER_PROJECT)
-  return()
-endif()
+include_guard(GLOBAL)
 
 # Extract project version from source
 file(STRINGS "${CMAKE_CURRENT_SOURCE_DIR}/include/pybind11/detail/common.h"
@@ -74,14 +63,6 @@ if(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
 
   set(PYBIND11_MASTER_PROJECT ON)
 
-  if(OSX AND CMAKE_VERSION VERSION_LESS 3.7)
-    # Bug in macOS CMake < 3.7 is unable to download catch
-    message(WARNING "CMAKE 3.7+ needed on macOS to download catch, and newer HIGHLY recommended")
-  elseif(WINDOWS AND CMAKE_VERSION VERSION_LESS 3.8)
-    # Only tested with 3.8+ in CI.
-    message(WARNING "CMAKE 3.8+ tested on Windows, previous versions untested")
-  endif()
-
   message(STATUS "CMake ${CMAKE_VERSION}")
 
   if(CMAKE_CXX_STANDARD)
@@ -133,8 +114,7 @@ cmake_dependent_option(
   "Install pybind11 headers in Python include directory instead of default installation prefix"
   OFF "PYBIND11_INSTALL" OFF)
 
-cmake_dependent_option(PYBIND11_FINDPYTHON "Force new FindPython" ${_pybind11_findpython_default}
-                       "NOT CMAKE_VERSION VERSION_LESS 3.12" OFF)
+option(PYBIND11_FINDPYTHON "Force new FindPython" ${_pybind11_findpython_default})
 
 # Allow PYTHON_EXECUTABLE if in FINDPYTHON mode and building pybind11's tests
 # (makes transition easier while we support both modes).
@@ -183,7 +163,7 @@ set(PYBIND11_HEADERS
     include/pybind11/typing.h)
 
 # Compare with grep and warn if mismatched
-if(PYBIND11_MASTER_PROJECT AND NOT CMAKE_VERSION VERSION_LESS 3.12)
+if(PYBIND11_MASTER_PROJECT)
   file(
     GLOB_RECURSE _pybind11_header_check
     LIST_DIRECTORIES false
@@ -201,10 +181,7 @@ if(PYBIND11_MASTER_PROJECT AND NOT CMAKE_VERSION VERSION_LESS 3.12)
   endif()
 endif()
 
-# CMake 3.12 added list(TRANSFORM <list> PREPEND
-# But we can't use it yet
-string(REPLACE "include/" "${CMAKE_CURRENT_SOURCE_DIR}/include/" PYBIND11_HEADERS
-               "${PYBIND11_HEADERS}")
+list(TRANSFORM PYBIND11_HEADERS PREPEND "include/")
 
 # Cache variable so this can be used in parent projects
 set(pybind11_INCLUDE_DIR
@@ -274,25 +251,11 @@ if(PYBIND11_INSTALL)
     tools/${PROJECT_NAME}Config.cmake.in "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake"
     INSTALL_DESTINATION ${PYBIND11_CMAKECONFIG_INSTALL_DIR})
 
-  if(CMAKE_VERSION VERSION_LESS 3.14)
-    # Remove CMAKE_SIZEOF_VOID_P from ConfigVersion.cmake since the library does
-    # not depend on architecture specific settings or libraries.
-    set(_PYBIND11_CMAKE_SIZEOF_VOID_P ${CMAKE_SIZEOF_VOID_P})
-    unset(CMAKE_SIZEOF_VOID_P)
-
-    write_basic_package_version_file(
-      ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
-      VERSION ${PROJECT_VERSION}
-      COMPATIBILITY AnyNewerVersion)
-
-    set(CMAKE_SIZEOF_VOID_P ${_PYBIND11_CMAKE_SIZEOF_VOID_P})
-  else()
-    # CMake 3.14+ natively supports header-only libraries
-    write_basic_package_version_file(
-      ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
-      VERSION ${PROJECT_VERSION}
-      COMPATIBILITY AnyNewerVersion ARCH_INDEPENDENT)
-  endif()
+  # CMake natively supports header-only libraries
+  write_basic_package_version_file(
+    ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
+    VERSION ${PROJECT_VERSION}
+    COMPATIBILITY AnyNewerVersion ARCH_INDEPENDENT)
 
   install(
     FILES ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake

docs/advanced/embedding.rst

@@ -18,7 +18,7 @@ information, see :doc:`/compiling`.
 
 .. code-block:: cmake
 
-    cmake_minimum_required(VERSION 3.5...3.29)
+    cmake_minimum_required(VERSION 3.15...3.30)
     project(example)
 
     find_package(pybind11 REQUIRED)  # or `add_subdirectory(pybind11)`

docs/compiling.rst

@@ -18,7 +18,7 @@ A Python extension module can be created with just a few lines of code:
 
 .. code-block:: cmake
 
-    cmake_minimum_required(VERSION 3.15...3.29)
+    cmake_minimum_required(VERSION 3.15...3.30)
     project(example LANGUAGES CXX)
 
     set(PYBIND11_FINDPYTHON ON)
@@ -319,11 +319,11 @@ Building with CMake
 
 For C++ codebases that have an existing CMake-based build system, a Python
 extension module can be created with just a few lines of code, as seen above in
-the module section. Pybind11 currently supports a lower minimum if you don't
-use the modern FindPython, though be aware that CMake 3.27 removed the old
-mechanism, so pybind11 will automatically switch if the old mechanism is not
-available. Please opt into the new mechanism if at all possible. Our default
-may change in future versions. This is the minimum required:
+the module section. Pybind11 currently defaults to the old mechanism, though be
+aware that CMake 3.27 removed the old mechanism, so pybind11 will automatically
+switch if the old mechanism is not available. Please opt into the new mechanism
+if at all possible. Our default may change in future versions. This is the
+minimum required:
 
 
 
@@ -333,6 +333,9 @@ may change in future versions. This is the minimum required:
 .. versionchanged:: 2.11
    CMake 3.5+ is required.
 
+.. versionchanged:: 2.14
+   CMake 3.15+ is required.
+
 
 Further information can be found at :doc:`cmake/index`.
 
@@ -444,7 +447,7 @@ See the `Config file`_ docstring for details of relevant CMake variables.
 
 .. code-block:: cmake
 
-    cmake_minimum_required(VERSION 3.4...3.18)
+    cmake_minimum_required(VERSION 3.15...3.30)
     project(example LANGUAGES CXX)
 
     find_package(pybind11 REQUIRED)
@@ -483,14 +486,13 @@ can refer to the same [cmake_example]_ repository for a full sample project
 FindPython mode
 ---------------
 
-CMake 3.12+ (3.15+ recommended, 3.18.2+ ideal) added a new module called
-FindPython that had a highly improved search algorithm and modern targets
-and tools. If you use FindPython, pybind11 will detect this and use the
-existing targets instead:
+Modern CMake (3.18.2+ ideal) added a new module called FindPython that had a
+highly improved search algorithm and modern targets and tools. If you use
+FindPython, pybind11 will detect this and use the existing targets instead:
 
 .. code-block:: cmake
 
-    cmake_minimum_required(VERSION 3.15...3.22)
+    cmake_minimum_required(VERSION 3.15...3.30)
     project(example LANGUAGES CXX)
 
     find_package(Python 3.8 COMPONENTS Interpreter Development REQUIRED)
@@ -541,7 +543,7 @@ available in all modes. The targets provided are:
      Just the "linking" part of pybind11:module
 
    ``pybind11::module``
-     Everything for extension modules - ``pybind11::pybind11`` + ``Python::Module`` (FindPython CMake 3.15+) or ``pybind11::python_link_helper``
+     Everything for extension modules - ``pybind11::pybind11`` + ``Python::Module`` (FindPython) or ``pybind11::python_link_helper``
 
    ``pybind11::embed``
      Everything for embedding the Python interpreter - ``pybind11::pybind11`` + ``Python::Python`` (FindPython) or Python libs
@@ -568,7 +570,7 @@ You can use these targets to build complex applications. For example, the
 
 .. code-block:: cmake
 
-    cmake_minimum_required(VERSION 3.5...3.29)
+    cmake_minimum_required(VERSION 3.15...3.30)
     project(example LANGUAGES CXX)
 
     find_package(pybind11 REQUIRED)  # or add_subdirectory(pybind11)
@@ -626,7 +628,7 @@ information about usage in C++, see :doc:`/advanced/embedding`.
 
 .. code-block:: cmake
 
-    cmake_minimum_required(VERSION 3.5...3.29)
+    cmake_minimum_required(VERSION 3.15...3.30)
     project(example LANGUAGES CXX)
 
     find_package(pybind11 REQUIRED)  # or add_subdirectory(pybind11)

docs/faq.rst

@@ -258,9 +258,9 @@ CMake configure line. (Replace ``$(which python)`` with a path to python if
 your prefer.)
 
 You can alternatively try ``-DPYBIND11_FINDPYTHON=ON``, which will activate the
-new CMake FindPython support instead of pybind11's custom search. Requires
-CMake 3.12+, and 3.15+ or 3.18.2+ are even better. You can set this in your
-``CMakeLists.txt`` before adding or finding pybind11, as well.
+new CMake FindPython support instead of pybind11's custom search. Newer CMake,
+like, 3.18.2+, is recommended. You can set this in your ``CMakeLists.txt``
+before adding or finding pybind11, as well.
 
 Inconsistent detection of Python version in CMake and pybind11
 ==============================================================
@@ -281,11 +281,11 @@ There are three possible solutions:
    from CMake and rely on pybind11 in detecting Python version. If this is not
    possible, the CMake machinery should be called *before* including pybind11.
 2. Set ``PYBIND11_FINDPYTHON`` to ``True`` or use ``find_package(Python
-   COMPONENTS Interpreter Development)`` on modern CMake (3.12+, 3.15+ better,
-   3.18.2+ best). Pybind11 in these cases uses the new CMake FindPython instead
-   of the old, deprecated search tools, and these modules are much better at
-   finding the correct Python. If FindPythonLibs/Interp are not available
-   (CMake 3.27+), then this will be ignored and FindPython will be used.
+   COMPONENTS Interpreter Development)`` on modern CMake ( 3.18.2+ best).
+   Pybind11 in these cases uses the new CMake FindPython instead of the old,
+   deprecated search tools, and these modules are much better at finding the
+   correct Python. If FindPythonLibs/Interp are not available (CMake 3.27+),
+   then this will be ignored and FindPython will be used.
 3. Set ``PYBIND11_NOPYTHON`` to ``TRUE``. Pybind11 will not search for Python.
    However, you will have to use the target-based system, and do more setup
    yourself, because it does not know about or include things that depend on

tests/CMakeLists.txt

@@ -5,16 +5,7 @@
 # All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
-cmake_minimum_required(VERSION 3.5)
-
-# The `cmake_minimum_required(VERSION 3.5...3.29)` syntax does not work with
-# some versions of VS that have a patched CMake 3.11. This forces us to emulate
-# the behavior using the following workaround:
-if(${CMAKE_VERSION} VERSION_LESS 3.29)
-  cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
-else()
-  cmake_policy(VERSION 3.29)
-endif()
+cmake_minimum_required(VERSION 3.15...3.30)
 
 # Filter out items; print an optional message if any items filtered. This ignores extensions.
 #
@@ -76,8 +67,8 @@ project(pybind11_tests CXX)
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/../tools")
 
 option(PYBIND11_WERROR "Report all warnings as errors" OFF)
-option(DOWNLOAD_EIGEN "Download EIGEN (requires CMake 3.11+)" OFF)
-option(PYBIND11_CUDA_TESTS "Enable building CUDA tests (requires CMake 3.12+)" OFF)
+option(DOWNLOAD_EIGEN "Download EIGEN" OFF)
+option(PYBIND11_CUDA_TESTS "Enable building CUDA tests" OFF)
 set(PYBIND11_TEST_OVERRIDE
     ""
     CACHE STRING "Tests from ;-separated list of *.cpp files will be built instead of all tests")
@@ -249,12 +240,7 @@ endif()
 if(PYBIND11_TEST_FILES_EIGEN_I GREATER -1)
   # Try loading via newer Eigen's Eigen3Config first (bypassing tools/FindEigen3.cmake).
   # Eigen 3.3.1+ exports a cmake 3.0+ target for handling dependency requirements, but also
-  # produces a fatal error if loaded from a pre-3.0 cmake.
   if(DOWNLOAD_EIGEN)
-    if(CMAKE_VERSION VERSION_LESS 3.11)
-      message(FATAL_ERROR "CMake 3.11+ required when using DOWNLOAD_EIGEN")
-    endif()
-
     include(FetchContent)
     FetchContent_Declare(
       eigen
@@ -315,8 +301,7 @@ if(PYBIND11_TEST_FILES_EIGEN_I GREATER -1)
     if(PYBIND11_TEST_FILES_EIGEN_I GREATER -1)
       list(REMOVE_AT PYBIND11_TEST_FILES ${PYBIND11_TEST_FILES_EIGEN_I})
     endif()
-    message(
-      STATUS "Building tests WITHOUT Eigen, use -DDOWNLOAD_EIGEN=ON on CMake 3.11+ to download")
+    message(STATUS "Building tests WITHOUT Eigen, use -DDOWNLOAD_EIGEN=ON to download")
   endif()
 endif()
 
@@ -501,12 +486,10 @@ foreach(target ${test_targets})
 endforeach()
 
 # Provide nice organisation in IDEs
-if(NOT CMAKE_VERSION VERSION_LESS 3.8)
-  source_group(
-    TREE "${CMAKE_CURRENT_SOURCE_DIR}/../include"
-    PREFIX "Header Files"
-    FILES ${PYBIND11_HEADERS})
-endif()
+source_group(
+  TREE "${CMAKE_CURRENT_SOURCE_DIR}/../include"
+  PREFIX "Header Files"
+  FILES ${PYBIND11_HEADERS})
 
 # Make sure pytest is found or produce a warning
 pybind11_find_import(pytest VERSION 3.1)

tests/extra_python_package/test_files.py

@@ -9,7 +9,6 @@
 import zipfile
 
 # These tests must be run explicitly
-# They require CMake 3.15+ (--install)
 
 DIR = os.path.abspath(os.path.dirname(__file__))
 MAIN_DIR = os.path.dirname(os.path.dirname(DIR))

tests/pyproject.toml

@@ -10,10 +10,6 @@ name = "pybind11_tests"
 version = "0.0.1"
 dependencies = ["pytest", "pytest-timeout", "numpy", "scipy"]
 
-[tool.scikit-build]
-# Hide a warning while we also support CMake < 3.15
-cmake.version = ">=3.15"
-
 [tool.scikit-build.cmake.define]
 PYBIND11_FINDPYTHON = true
 

tests/test_cmake_build/installed_embed/CMakeLists.txt

@@ -1,13 +1,4 @@
-cmake_minimum_required(VERSION 3.5)
-
-# The `cmake_minimum_required(VERSION 3.5...3.29)` syntax does not work with
-# some versions of VS that have a patched CMake 3.11. This forces us to emulate
-# the behavior using the following workaround:
-if(${CMAKE_VERSION} VERSION_LESS 3.29)
-  cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
-else()
-  cmake_policy(VERSION 3.29)
-endif()
+cmake_minimum_required(VERSION 3.15...3.30)
 
 project(test_installed_embed CXX)