simplify travis setting

.travis.yml

@@ -11,21 +11,12 @@ matrix:
       sudo: false
       env: GCC_VER=4.9
 
-cache:
-  directories:
-    - $HOME/.ccache
-
 addons:
   apt:
     sources:
     - ubuntu-toolchain-r-test
     packages:
     - build-essential
-    - ccache
-    - cmake
-    - gcc-4.9
-    - libc6-i836
-    - python-empy
 
 before_install:
   - if [ "${TRAVIS_OS_NAME}" = "linux" ]; then
@@ -36,26 +27,14 @@ before_install:
       && wget -O gcc.tar.bz2 ${GCC_URL}
       && tar -jxf gcc.tar.bz2 --strip 1
       && exportline="export PATH=$HOME/gcc/bin:\$PATH"
+      && printenv PATH
       && if grep -Fxq "$exportline" ~/.profile; then echo nothing to do ; else echo $exportline >> ~/.profile; fi
       && . ~/.profile
       && popd
       ;
    fi
 
-before_script:
-# setup ccache
-  - mkdir -p ~/bin
-  - ln -s /usr/bin/ccache ~/bin/arm-none-eabi-g++
-  - ln -s /usr/bin/ccache ~/bin/arm-none-eabi-gcc
-  - ln -s /usr/bin/ccache ~/bin/arm-none-eabi-size
-  - ln -s /usr/bin/ccache ~/bin/arm-none-eabi-objcopy
-  - export PATH=~/bin:$PATH
-
-
 script:
-  - ccache -z
   - arm-none-eabi-gcc --version
-  - ccache -s
   - make
-  - ccache -s