cmake: clean more files, fix python dependency

Remove generated documentation, python and mruby build artifacts.
Note that this does not work for Ninja, Makefile works fine though.

doc/CMakeLists.txt

@@ -249,6 +249,9 @@ add_custom_command(
 )
 
 
+
+set_directory_properties(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES "${BUILDDIR}")
+
 # Invokes sphinx-build and prints the given messages when completed
 function(sphinxbuild builder)
   set(echo_commands)

python/CMakeLists.txt

@@ -1,11 +1,10 @@
 # EXTRA_DIST = cnghttp2.pxd nghttp2.pyx
 
 if(ENABLE_PYTHON_BINDINGS)
-
   add_custom_target(python ALL
     COMMAND "${PYTHON_EXECUTABLE}" setup.py build
     VERBATIM
-    DEPENDS nghttp2.c
+    DEPENDS nghttp2.c nghttp2
   )
 
   configure_file(install-python.cmake.in install-python.cmake ESCAPE_QUOTES @ONLY)
@@ -17,6 +16,12 @@ if(ENABLE_PYTHON_BINDINGS)
     VERBATIM
     DEPENDS nghttp2.pyx
   )
+
+  # Instead of calling "setup.py clean --all", this should do...
+  set_directory_properties(PROPERTIES
+    ADDITIONAL_MAKE_CLEAN_FILES "build;python_nghttp2.egg-info"
+  )
+
 ## This works also, except that the installation target is missing...
 #  include(UseCython)
 #  cython_add_module(python_nghttp2 nghttp2.pyx)

third-party/CMakeLists.txt

@@ -61,6 +61,8 @@ if(ENABLE_THIRD_PARTY)
     )
     add_dependencies(mruby-lib mruby)
 
-    # XXX clean ${CMAKE_CURRENT_BINARY_DIR}/mruby/build
+    set_directory_properties(PROPERTIES
+      ADDITIONAL_MAKE_CLEAN_FILES mruby/build
+    )
   endif()
 endif()