Use 4 cores for building, specify configuration to Python build script.

Author: treamology

.travis.yml

@@ -30,4 +30,4 @@ before_script:
 script:
   - mkdir build && cd build
   - cmake -DCMAKE_BUILD_TYPE=Release $CMAKE_OPTIONS ..
-  - cmake --build . --config Release
+  - cmake --build . --config Release -- -j4

CMakeLists.txt

@@ -859,6 +859,7 @@ if(BUILD_PYTHON)
         CONFIGURE_COMMAND ""
         BUILD_COMMAND <SOURCE_DIR>/build-ios.py --arch=${CMAKE_OSX_ARCHITECTURES}
                       --install-dir=<INSTALL_DIR> --suppress-stdout
+                      --configuration=$<CONFIG>
         INSTALL_COMMAND ""
 
         BUILD_IN_SOURCE 1