travis-ci only build sitl on OSX

.travis.yml

@@ -60,9 +60,8 @@ before_install:
     elif [ "${TRAVIS_OS_NAME}" = "osx" ]; then
          brew tap PX4/homebrew-px4
       && brew update; brew update
-      && brew install cmake ninja astyle gcc-arm-none-eabi
+      && brew install cmake ninja
       && brew install genromfs
-      && brew install kconfig-frontends
       && sudo easy_install pip
       && sudo pip install pyserial empy
       ;
@@ -93,24 +92,22 @@ env:
     - PX4_AWS_BUCKET=px4-travis
 
 script:
-  - git submodule update --init --recursive
-  - make check_format
-  - arm-none-eabi-gcc --version
+  - git submodule update --quiet --init --recursive
   - echo 'Building POSIX Firmware..' && make posix_sitl_default
   - echo 'Running Tests..' && make posix_sitl_default test
   - echo 'Running Unittests..' && cd unittests && ./run_tests.sh
-  - cd ..
-  - echo 'Building NuttX px4fmu-v1 Firmware..' && make px4fmu-v1_default
-  - echo 'Building NuttX px4fmu-v2 Firmware..' && make px4fmu-v2_default
-# Only provide UAVCAN firmware binaries for Pixracer and Pixhawk 3
-  - echo 'Building UAVCAN node firmware..' && git clone https://github.com/thiemar/vectorcontrol
-  - cd vectorcontrol
-  - BOARD=s2740vc_1_0 make && BOARD=px4esc_1_6 make
-  - ../Tools/uavcan_copy.sh
-  - cd ..
-  - echo 'Building NuttX px4fmu-v4 Firmware..' && make px4fmu-v4_default
-  - echo 'Building NuttX px4-stm32f4discovery Firmware..' && make px4-stm32f4discovery_default
-  - echo 'Running Tests..' && make px4fmu-v2_default test
+  - if [ "${TRAVIS_OS_NAME}" = "linux" ]; then
+         cd ${TRAVIS_BUILD_DIR}
+      && make check_format
+      && arm-none-eabi-gcc --version
+      && echo 'Building NuttX px4fmu-v1 Firmware..' && make px4fmu-v1_default
+      && echo 'Building NuttX px4fmu-v2 Firmware..' && make px4fmu-v2_default
+      && echo 'Building UAVCAN node firmware..' && (git clone https://github.com/thiemar/vectorcontrol && cd vectorcontrol && BOARD=s2740vc_1_0 make -s && BOARD=px4esc_1_6 make -s && ../Tools/uavcan_copy.sh)
+      && echo 'Building NuttX px4fmu-v4 Firmware..' && make px4fmu-v4_default
+      && echo 'Building NuttX px4-stm32f4discovery Firmware..' && make px4-stm32f4discovery_default
+      && echo 'Running Tests..' && make px4fmu-v2_default test
+      ;
+    fi
 
 after_success:
   - if [ "${TRAVIS_OS_NAME}" = "linux" ]; then