Made python extensions use static linking when compiled with visual studio

to avoid dll hell.

dlib/add_python_module

@@ -35,10 +35,19 @@ get_filename_component(PYTHON_PATH ${PYTHON_PATH} PATH)
 set(CMAKE_PREFIX_PATH ${PYTHON_PATH})
 
 
+# To avoid dll hell, always link everything statically when compiling in
+# visual studio.  This way, the resulting library won't depend on a bunch
+# of other dll files and can be safely copied to someone elese's computer
+# and expected to run.
+if (MSVC)
+    string(REGEX REPLACE "add_python_module$" "" dlib_path ${CMAKE_CURRENT_LIST_FILE})
+    include(${dlib_path}/tell_visual_studio_to_use_static_runtime.cmake)
+    add_definitions(-DBOOST_PYTHON_STATIC_LIB)
+    SET(Boost_USE_STATIC_LIBS ON)
+    SET(Boost_USE_MULTITHREADED ON)
+    SET(Boost_USE_STATIC_RUNTIME ON)
+endif()
 
-#SET(Boost_USE_STATIC_LIBS OFF)
-#SET(Boost_USE_MULTITHREADED ON)
-#SET(Boost_USE_STATIC_RUNTIME OFF)
 set(Boost_NO_BOOST_CMAKE ON)
 
 if (NOT WIN32)
@@ -124,8 +133,6 @@ endif()
 string(REGEX REPLACE "add_python_module$" "" dlib_path ${CMAKE_CURRENT_LIST_FILE})
 include(${dlib_path}/cmake)
 
-set(CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS_SKIP TRUE)
-INCLUDE(InstallRequiredSystemLibraries)
 
 # We put the extra _ on the end of the name just so it's possible to
 # have a module name of dlib and not get a conflict with the target named
@@ -161,21 +168,9 @@ macro(add_python_module module_name module_sources )
        # Determine the path to our CMakeLists.txt file.
        string(REGEX REPLACE "CMakeLists.txt$" "" base_path ${CMAKE_CURRENT_LIST_FILE})
        INSTALL(TARGETS ${module_name}_ 
-            DESTINATION "${base_path}/${path}"
+            RUNTIME DESTINATION  "${base_path}/${path}"
+            LIBRARY DESTINATION  "${base_path}/${path}"
            )
-
-       # On windows we will usually need to have the boost-python .dll files in the same folder or
-       # you will get an error about how they can't be found.  So copy the boost .dll files along with
-       # your module to the install folder to avoid this.  Also copy any visual studio runtime dlls as well.
-       if (WIN32)
-           list(GET Boost_LIBRARIES 1 boostlibs1)
-           list(GET Boost_LIBRARIES 3 boostlibs2)
-           string(REGEX REPLACE ".lib$" ".dll" boostdlls1 ${boostlibs1})
-           string(REGEX REPLACE ".lib$" ".dll" boostdlls2 ${boostlibs2})
-           INSTALL(FILES ${boostdlls1} ${boostdlls2} ${CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS}
-                DESTINATION "${base_path}/${path}"
-                )
-       endif()
    endmacro()
 
 endmacro()