Workaround (#618)

Workaround Python_VERSION_MAJOR and MINOR not being set by replasing
Python3 with Python

Disable generation of some of the COMPONENTs not needed for GenAI. There
are still unwanted empty archives, but they are generated
uncounditionally by rapidjson.

CMakeLists.txt

@@ -23,6 +23,9 @@ project(OpenVINOGenAI
         HOMEPAGE_URL "https://github.com/openvinotoolkit/openvino.genai"
         LANGUAGES CXX)
 
+option(INSTALL_GTEST "Enable installation of googletest. (Projects embedding googletest may want to turn this OFF.)" OFF)
+option(RAPIDJSON_BUILD_DOC "Build rapidjson documentation." OFF)
+
 # Find OpenVINODeveloperPackage first to compile with SDL flags
 find_package(OpenVINODeveloperPackage QUIET
              PATHS "${OpenVINO_DIR}")

src/python/CMakeLists.txt

@@ -11,9 +11,50 @@ FetchContent_Declare(
 FetchContent_GetProperties(pybind11)
 # search for FindPython3.cmake instead of legacy modules
 set(PYBIND11_FINDPYTHON ON)
+
+# Wouraround Python_VERSION_MAJOR and MINOR not being set by finding
+# Python package instead of Python3
+macro(ov_find_python_no_3 find_package_mode)
+    # Settings for FindPython3.cmake
+    if(NOT DEFINED Python3_USE_STATIC_LIBS)
+        set(Python3_USE_STATIC_LIBS OFF)
+    endif()
+
+    if(NOT DEFINED Python3_FIND_VIRTUALENV)
+        set(Python3_FIND_VIRTUALENV FIRST)
+    endif()
+
+    if(NOT DEFINED Python3_FIND_IMPLEMENTATIONS)
+        set(Python3_FIND_IMPLEMENTATIONS CPython PyPy)
+    endif()
+
+    if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.18)
+        set(python3_development_component Development.Module)
+    else()
+        set(python3_development_component Development)
+    endif()
+
+    if(CMAKE_CROSSCOMPILING AND LINUX)
+        # allow to find python headers from host in case of cross-compilation
+        # e.g. install libpython3-dev:<foreign arch> and finds its headers
+        set(_old_CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ${CMAKE_FIND_ROOT_PATH_MODE_INCLUDE})
+        set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH)
+        ov_cross_compile_define_debian_arch()
+    endif()
+
+    find_package(Python ${find_package_mode} COMPONENTS Interpreter ${python3_development_component})
+
+    if(CMAKE_CROSSCOMPILING AND LINUX)
+        ov_cross_compile_define_debian_arch_reset()
+        set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ${_old_CMAKE_FIND_ROOT_PATH_MODE_INCLUDE})
+    endif()
+
+    unset(python3_development_component)
+endmacro()
+
 # the following two calls are required for cross-compilation
 if(OpenVINODeveloperPackage_DIR)
-    ov_find_python3(REQUIRED)
+    ov_find_python_no_3(REQUIRED)
     ov_detect_python_module_extension()
 else()
     if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.18)