From d2435ba81cc98244ba845142a798fd913c172c89 Mon Sep 17 00:00:00 2001
From: Liu Yiqun <liuyiqun01@baidu.com>
Date: Tue, 29 Aug 2017 20:08:00 +0800
Subject: [PATCH] Disable the finding of python, swig related packages
 completely when WITH_PYTHON and WITH_SWIG_PY are set to OFF.

---
 cmake/external/python.cmake | 27 ++++++++++++---------------
 cmake/external/swig.cmake   |  4 ++++
 2 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/cmake/external/python.cmake b/cmake/external/python.cmake
index 53ef7cd29c1..46c68cce324 100644
--- a/cmake/external/python.cmake
+++ b/cmake/external/python.cmake
@@ -12,16 +12,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-INCLUDE(ExternalProject)
+IF(NOT WITH_PYTHON)
+    return()
+ENDIF()
+
 INCLUDE(python_module)
 
-FIND_HOST_PACKAGE(PythonInterp 2.7)
-IF(WITH_PYTHON)
-    FIND_HOST_PACKAGE(PythonLibs 2.7)
-    # Fixme: Maybe find a static library. Get SHARED/STATIC by FIND_PACKAGE.
-    ADD_LIBRARY(python SHARED IMPORTED GLOBAL)
-    SET_PROPERTY(TARGET python PROPERTY IMPORTED_LOCATION ${PYTHON_LIBRARIES})
-ENDIF(WITH_PYTHON)
+FIND_PACKAGE(PythonInterp 2.7)
+FIND_PACKAGE(PythonLibs 2.7)
+# Fixme: Maybe find a static library. Get SHARED/STATIC by FIND_PACKAGE.
+ADD_LIBRARY(python SHARED IMPORTED GLOBAL)
+SET_PROPERTY(TARGET python PROPERTY IMPORTED_LOCATION ${PYTHON_LIBRARIES})
 
 SET(py_env "")
 IF(PYTHONINTERP_FOUND)
@@ -29,16 +30,12 @@ IF(PYTHONINTERP_FOUND)
     find_python_module(numpy REQUIRED)
     find_python_module(wheel REQUIRED)
     find_python_module(google.protobuf REQUIRED)
-    FIND_HOST_PACKAGE(NumPy REQUIRED)
+    FIND_PACKAGE(NumPy REQUIRED)
     IF(${PY_GOOGLE.PROTOBUF_VERSION} AND ${PY_GOOGLE.PROTOBUF_VERSION} VERSION_LESS "3.0.0")
         MESSAGE(FATAL_ERROR "Found Python Protobuf ${PY_GOOGLE.PROTOBUF_VERSION} < 3.0.0, "
         "please use pip to upgrade protobuf. pip install -U protobuf")
     ENDIF()
 ENDIF(PYTHONINTERP_FOUND)
 
-IF(WITH_PYTHON)
-    INCLUDE_DIRECTORIES(${PYTHON_INCLUDE_DIR})
-    INCLUDE_DIRECTORIES(${PYTHON_NUMPY_INCLUDE_DIR})
-ELSE()
-    SET(PYTHON_LIBRARIES "")
-ENDIF()
+INCLUDE_DIRECTORIES(${PYTHON_INCLUDE_DIR})
+INCLUDE_DIRECTORIES(${PYTHON_NUMPY_INCLUDE_DIR})
diff --git a/cmake/external/swig.cmake b/cmake/external/swig.cmake
index 744c766ee7b..ce088ae7eaa 100644
--- a/cmake/external/swig.cmake
+++ b/cmake/external/swig.cmake
@@ -12,6 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+IF(NOT WITH_SWIG_PY)
+    return()
+ENDIF()
+
 FIND_PACKAGE(SWIG)
 
 IF(NOT SWIG_FOUND)
-- 
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