apacheGH-34921: [C++][Python][Java] Require CMake 3.16 or later

We need to support Ubuntu 20.04 (CMake 3.16) or later, CentOS 7 (CMake
3.17) or later, and Debian GNU/Linux buster (CMake 3.13 but backports
repository has CMake 3.18) or later.

So we can require CMake 3.16 or later.

cpp/CMakeLists.txt

@@ -15,7 +15,7 @@
 # specific language governing permissions and limitations
 # under the License.
 
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.16)
 message(STATUS "Building using CMake version: ${CMAKE_VERSION}")
 
 # Compiler id for Apple Clang is now AppleClang.
@@ -166,19 +166,15 @@ if("$ENV{CMAKE_EXPORT_COMPILE_COMMANDS}" STREQUAL "1"
 endif()
 
 # Needed for linting targets, etc.
-if(${CMAKE_VERSION} VERSION_LESS "3.12.0")
-  find_package(PythonInterp)
-else()
-  # Use the first Python installation on PATH, not the newest one
-  set(Python3_FIND_STRATEGY "LOCATION")
-  # On Windows, use registry last, not first
-  set(Python3_FIND_REGISTRY "LAST")
-  # On macOS, use framework last, not first
-  set(Python3_FIND_FRAMEWORK "LAST")
+# Use the first Python installation on PATH, not the newest one
+set(Python3_FIND_STRATEGY "LOCATION")
+# On Windows, use registry last, not first
+set(Python3_FIND_REGISTRY "LAST")
+# On macOS, use framework last, not first
+set(Python3_FIND_FRAMEWORK "LAST")
 
-  find_package(Python3)
-  set(PYTHON_EXECUTABLE ${Python3_EXECUTABLE})
-endif()
+find_package(Python3)
+set(PYTHON_EXECUTABLE ${Python3_EXECUTABLE})
 
 # ----------------------------------------------------------------------
 # cmake options
@@ -233,11 +229,6 @@ if(ARROW_USE_CCACHE
   endif()
 endif()
 
-if(ARROW_USE_PRECOMPILED_HEADERS AND ${CMAKE_VERSION} VERSION_LESS "3.16.0")
-  message(WARNING "Precompiled headers need CMake 3.16.0 or later, disabling")
-  set(ARROW_USE_PRECOMPILED_HEADERS OFF)
-endif()
-
 if(ARROW_OPTIONAL_INSTALL)
   # Don't make the "install" target depend on the "all" target
   set(CMAKE_SKIP_INSTALL_ALL_DEPENDENCY true)

cpp/cmake_modules/BuildUtils.cmake

@@ -227,16 +227,12 @@ function(ADD_ARROW_LIB LIB_NAME)
   endif()
 
   if(WIN32
-     OR (CMAKE_GENERATOR STREQUAL Xcode)
-     OR CMAKE_VERSION VERSION_LESS 3.12
+     OR CMAKE_GENERATOR STREQUAL Xcode
      OR NOT ARROW_POSITION_INDEPENDENT_CODE)
     # We need to compile C++ separately for each library kind (shared and static)
     # because of dllexport declarations on Windows.
     # The Xcode generator doesn't reliably work with Xcode as target names are not
     # guessed correctly.
-    # We can't use target for object library with CMake 3.11 or earlier.
-    # See also: Object Libraries:
-    # https://cmake.org/cmake/help/latest/command/add_library.html#object-libraries
     set(USE_OBJLIB OFF)
   else()
     set(USE_OBJLIB ON)

cpp/cmake_modules/FindPython3Alt.cmake

@@ -41,19 +41,10 @@ if(Python3Alt_FIND_QUIETLY)
   list(APPEND Python3Alt_NumPy_FIND_PACKAGE_OPTIONS QUIET)
 endif()
 
-# Need CMake 3.15 or later for Python3_FIND_STRATEGY
-if(${CMAKE_VERSION} VERSION_LESS "3.15.0")
-  find_package(PythonLibsNew ${Python3Alt_FIND_PACKAGE_OPTIONS})
-  find_package(NumPy ${Python3Alt_NumPy_FIND_PACKAGE_OPTIONS})
-  find_package_handle_standard_args(
-    Python3Alt REQUIRED_VARS PYTHON_EXECUTABLE PYTHON_INCLUDE_DIRS NUMPY_INCLUDE_DIRS)
-  return()
-endif()
-
-if(${CMAKE_VERSION} VERSION_LESS "3.18.0" OR ARROW_BUILD_TESTS)
-  # When building arrow-python-test, we need libpython to be present, so ask for
-  # the full "Development" component.  Also ask for it on CMake < 3.18,
-  # where "Development.Module" is not available.
+if(CMAKE_VERSION VERSION_LESS 3.18.0)
+  # We need libpython to be present, so ask for the full "Development"
+  # component on CMake < 3.18, where "Development.Module" is not
+  # available.
   find_package(Python3 ${Python3Alt_FIND_PACKAGE_OPTIONS} COMPONENTS Interpreter
                                                                      Development NumPy)
 else()