cmake: support PARTIO_BUILD_PYTHON

Author: davvid

CMakeLists.txt

@@ -130,6 +130,10 @@ if (ZLIB_FOUND)
     list(APPEND PARTIO_LIBRARIES ZLIB::ZLIB)
 endif()
 
+if (PARTIO_BUILD_PYTHON)
+    find_package(Python REQUIRED COMPONENTS Interpreter Development)
+endif()
+
 ## Traverse subdirectories
 add_subdirectory(src/lib)
 if (PARTIO_BUILD_TOOLS)
@@ -138,7 +142,6 @@ if (PARTIO_BUILD_TOOLS)
     add_subdirectory(src/tools)
 endif()
 if (PARTIO_BUILD_PYTHON)
-    find_package(Python REQUIRED COMPONENTS Interpreter Development)
     add_subdirectory(src/py)
 endif()
 if (PARTIO_BUILD_DOCS)

src/tools/CMakeLists.txt

@@ -67,5 +67,7 @@ install(PROGRAMS partedit.py DESTINATION ${CMAKE_INSTALL_BINDIR} RENAME partedit
 install(PROGRAMS partjson.py DESTINATION ${CMAKE_INSTALL_BINDIR} RENAME partjson)
 install(PROGRAMS partinspect.py DESTINATION ${CMAKE_INSTALL_BINDIR} RENAME partinspect)
 
-set(PYTHON_DEST "${CMAKE_INSTALL_LIBDIR}/python${Python_VERSION_MAJOR}.${Python_VERSION_MINOR}/site-packages" )
-install(FILES partedit.py partjson.py partinspect.py DESTINATION ${PYTHON_DEST})
+if (PARTIO_BUILD_PYTHON)
+    set(PYTHON_DEST "${CMAKE_INSTALL_LIBDIR}/python${Python_VERSION_MAJOR}.${Python_VERSION_MINOR}/site-packages" )
+    install(FILES partedit.py partjson.py partinspect.py DESTINATION ${PYTHON_DEST})
+endif()