CMake: Add the NINJA_ARGS config variable, set -j 4 in Travis, 2 in AppVeyor

.travis.yml

@@ -3,7 +3,7 @@ matrix:
     - os: linux
       sudo: required
     - os: osx
-      osx_image: xcode7
+      osx_image: xcode7.3
 
 language: cpp
 
@@ -43,7 +43,7 @@ install:
 - git submodule update
 - mkdir out
 - cd out
-- cmake ..
+- cmake -DNINJA_ARGS="-j 4" ..
 
 script:
 - make package

CMakeLists.txt

@@ -21,6 +21,7 @@ find_package(DepotTools REQUIRED)
 
 option(BUILD_TESTS "Build test binaries" OFF)
 option(BUILD_SAMPLES "Build samples binaries" OFF)
+set(NINJA_ARGS "" CACHE STRING "Ninja arguments to pass before compiling WebRTC")
 
 #
 # Versioning

Targets/WebRTC/CMakeLists.txt

@@ -88,7 +88,7 @@ add_libwebrtc_command(webrtc-clang
 #
 # Run the build command
 #
-set(LIBWEBRTC_BUILD_CMD ninja -C out/Default)
+set(LIBWEBRTC_BUILD_CMD ninja ${NINJA_ARGS} -C out/Default)
 add_libwebrtc_command(webrtc-ninja
                       "Build"
                       "${LIBWEBRTC_BUILD_CMD}"
@@ -109,4 +109,4 @@ ExternalProject_Add(libwebrtc
                     CMAKE_ARGS
                     -DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}
                     -DLIBWEBRTC_INCLUDE_DIR:STRING=${CMAKE_BINARY_DIR}/src/webrtc
-                    -DLIBWEBRTC_OUTPUT_DIR:PATH=${CMAKE_BINARY_DIR}/src/out/Default)
+                    -DLIBWEBRTC_OUTPUT_DIR:PATH=${CMAKE_BINARY_DIR}/src/out/Default)

appveyor.yml

@@ -13,7 +13,7 @@ build:
 before_build:
   - cd c:\projects\libwebrtc
   - git submodule update --init --recursive
-  - cmake -G "Visual Studio 14 2015 Win64" -DCMAKE_INSTALL_PREFIX=c:\projects\libwebrtc .
+  - cmake -G "Visual Studio 14 2015 Win64" -DCMAKE_INSTALL_PREFIX=c:\projects\libwebrtc -DNINJA_ARGS="-j 2" .
 
 artifacts:
   - path: libwebrtc-0.0.1-rc.4-win32-x64.7z