Fix configuring with CMake version 4

fixes #27122

CMakeLists.txt

@@ -16,7 +16,7 @@ endif()
 include(cmake/OpenCVMinDepVersions.cmake)
 
 if(CMAKE_SYSTEM_NAME MATCHES WindowsPhone OR CMAKE_SYSTEM_NAME MATCHES WindowsStore)
-  cmake_minimum_required(VERSION 3.1 FATAL_ERROR)
+  cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
   #Required to resolve linker error issues due to incompatibility with CMake v3.0+ policies.
   #CMake fails to find _fseeko() which leads to subsequent linker error.
   #See details here: http://www.cmake.org/Wiki/CMake/Policies

cmake/OpenCVGenPkgconfig.cmake

@@ -110,7 +110,7 @@ endif()
 # =============================================================================
 else() # DEFINED CMAKE_HELPER_SCRIPT
 
-cmake_minimum_required(VERSION 2.8.12.2)
+cmake_minimum_required(VERSION 3.5)
 cmake_policy(SET CMP0012 NEW)
 include("${CMAKE_HELPER_SCRIPT}")
 include("${OpenCV_SOURCE_DIR}/cmake/OpenCVUtils.cmake")

doc/tutorials/introduction/linux_gcc_cmake/linux_gcc_cmake.markdown

@@ -63,7 +63,7 @@ int main(int argc, char** argv )
 
 Now you have to create your CMakeLists.txt file. It should look like this:
 @code{.cmake}
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.5)
 project( DisplayImage )
 find_package( OpenCV REQUIRED )
 include_directories( ${OpenCV_INCLUDE_DIRS} )

modules/python/CMakeLists.txt

@@ -35,7 +35,7 @@ add_subdirectory(python3)
 
 else()  # standalone build
 
-cmake_minimum_required(VERSION 2.8.12.2)
+cmake_minimum_required(VERSION 3.5)
 project(OpenCVPython CXX C)
 include("./standalone.cmake")
 

platforms/android/build-tests/test_cmake_build.py

@@ -7,7 +7,7 @@ import logging as log
 log.basicConfig(format='%(message)s', level=log.DEBUG)
 
 CMAKE_TEMPLATE='''\
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
+CMAKE_MINIMUM_REQUIRED(VERSION 3.5)
 
 # Enable C++11
 set(CMAKE_CXX_STANDARD 11)

samples/CMakeLists.example.in

@@ -1,5 +1,5 @@
 # cmake needs this line
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.5)
 
 if(NOT DEFINED EXAMPLE_NAME)
   message(FATAL_ERROR "Invalid build script: missing EXAMPLE_NAME")

samples/CMakeLists.txt

@@ -62,7 +62,7 @@ else()
 #  Standalone mode
 #
 #===================================================================================================
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.5)
 
 project(samples C CXX)
 option(BUILD_EXAMPLES "Build samples" ON)

samples/cpp/example_cmake/CMakeLists.txt

@@ -1,5 +1,5 @@
 # cmake needs this line
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.5)
 
 # Define project name
 project(opencv_example_project)

samples/cpp/tutorial_code/gpu/gpu-thrust-interop/CMakeLists.txt

@@ -1,4 +1,4 @@
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
+CMAKE_MINIMUM_REQUIRED(VERSION 3.5)
 
 FIND_PACKAGE(CUDA REQUIRED)
 INCLUDE_DIRECTORIES(${CUDA_INCLUDE_DIRS})

samples/hal/c_hal/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.12.2 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
 
 set(PROJECT_NAME "c_hal")
 set(HAL_LIB_NAME "c_hal")

samples/hal/slow_hal/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.12.2 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
 
 set(PROJECT_NAME "slow_hal")
 set(HAL_LIB_NAME "slow_hal")

samples/openvx/CMakeLists.txt

@@ -1,6 +1,6 @@
 ocv_install_example_src(cpp *.cpp *.hpp CMakeLists.txt)
 
-cmake_minimum_required(VERSION 2.8.12.2)
+cmake_minimum_required(VERSION 3.5)
 
 set(OPENCV_OPENVX_SAMPLE_REQUIRED_DEPS
   opencv_core