Revert "find_package(Python) (#1842)" (#1899)

This reverts commit c87b61e, reversing
changes made to f25b198.

CMakeLists.txt

@@ -44,5 +44,8 @@ if(NOT DEFINED CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE "RelWithDebInfo")
 endif()
 
+find_package(Git REQUIRED)
+find_package(Python COMPONENTS Interpreter REQUIRED)
+
 add_subdirectory(src/Core)
 add_subdirectory(Wrappers/Python)

Wrappers/Python/CMakeLists.txt

@@ -1,30 +1,50 @@
-find_package(Python COMPONENTS Interpreter REQUIRED)
+option (BUILD_PYTHON_WRAPPER "Build Python Wrapper" ON)
 
-if(PYTHON_DEST_DIR)
-  file(TO_CMAKE_PATH "${PYTHON_DEST_DIR}" PYTHON_DEST)
-endif()
+if (BUILD_PYTHON_WRAPPER)
+  find_package(PythonInterp REQUIRED)
 
-message("CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS}")
-if(NOT DEFINED)
-  set(CMAKE_BUILD_TYPE "RelWithDebInfo")
-endif()
+  #set(PYTHON_DEST_DIR "" CACHE PATH "Directory of the Python wrappers")
+  if (PYTHON_DEST_DIR)
+    file(TO_CMAKE_PATH "${PYTHON_DEST_DIR}" TMP)
+    set(PYTHON_DEST "${TMP}")
+    unset(TMP)
+  endif()
 
-# TODO: add to add_custom_command DEPENDS the list of python files of the project.
-# file(GLOB_RECURSE DEPS ${CMAKE_CURRENT_SOURCE_DIR}/cil/*.py )
-message("SETUPTOOLS_SCM_PRETEND_VERSION_FOR_CIL: $ENV{SETUPTOOLS_SCM_PRETEND_VERSION_FOR_CIL}")
-message("CMAKE_SOURCE_DIR: ${CMAKE_SOURCE_DIR}")
-if(PYTHON_DEST_DIR)
-  message(STATUS "CIL install using ${Python_EXECUTABLE} -m pip install -t ${PYTHON_DEST}")
-  add_custom_target(pythonsetup ALL
-    COMMAND ${Python_EXECUTABLE} -m pip install ${CMAKE_SOURCE_DIR} -t ${PYTHON_DEST} --upgrade
-    DEPENDS cilacc)
-else()
-  message(STATUS "CIL install using ${Python_EXECUTABLE} -m pip install")
-  add_custom_target(pythonsetup ALL
-    COMMAND ${Python_EXECUTABLE} -m pip install ${CMAKE_SOURCE_DIR} --upgrade
-    DEPENDS cilacc)
-endif()
-# install the data if not a conda build. With conda the data is in the dependency package cil-data
-if (NOT CONDA_BUILD)
-  install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/data/ DESTINATION ${CMAKE_INSTALL_PREFIX}/share/cil)
+  message("CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS}")
+  if(NOT DEFINED)
+    set(CMAKE_BUILD_TYPE "RelWithDebInfo")
+  endif()
+
+  find_package(PythonLibs)
+  if (PYTHONINTERP_FOUND)
+    message(STATUS "Found PYTHON_EXECUTABLE=${PYTHON_EXECUTABLE}")
+    message(STATUS "Python version ${PYTHON_VERSION_STRING}")
+  endif()
+  if (PYTHONLIBS_FOUND)
+    message(STATUS "Found PYTHON_INCLUDE_DIRS=${PYTHON_INCLUDE_DIRS}")
+    message(STATUS "Found PYTHON_LIBRARIES=${PYTHON_LIBRARIES}")
+  endif()
+
+  if (PYTHONINTERP_FOUND)
+      message("Python found " ${PYTHON_EXECUTABLE})
+      # TODO: add to add_custom_command DEPENDS the list of python files of the project.
+      # file(GLOB_RECURSE DEPS ${CMAKE_CURRENT_SOURCE_DIR}/cil/*.py )
+      message("SETUPTOOLS_SCM_PRETEND_VERSION_FOR_CIL: $ENV{SETUPTOOLS_SCM_PRETEND_VERSION_FOR_CIL}")
+      message("CMAKE_SOURCE_DIR: ${CMAKE_SOURCE_DIR}")
+      if(PYTHON_DEST_DIR)
+        message(STATUS "CIL install using ${PYTHON_EXECUTABLE} -m pip install -t ${PYTHON_DEST}")
+        add_custom_target(pythonsetup ALL
+          COMMAND ${PYTHON_EXECUTABLE} -m pip install ${CMAKE_SOURCE_DIR} -t ${PYTHON_DEST} --upgrade
+          DEPENDS cilacc)
+      else()
+        message(STATUS "CIL install using ${PYTHON_EXECUTABLE} -m pip install")
+        add_custom_target(pythonsetup ALL
+          COMMAND ${PYTHON_EXECUTABLE} -m pip install ${CMAKE_SOURCE_DIR} --upgrade
+          DEPENDS cilacc)
+      endif()
+      # install the data if not a conda build. With conda the data is in the dependency package cil-data
+      if (NOT CONDA_BUILD)
+        install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/data/ DESTINATION ${CMAKE_INSTALL_PREFIX}/share/cil)
+      endif()
+  endif()
 endif()