travis-ci switch to clang-3.5

.travis.yml

@@ -14,11 +14,12 @@ cache:
 addons:
   apt:
     sources:
+    - llvm-toolchain-precise-3.5
     - ubuntu-toolchain-r-test
     packages:
     - autoconf
     - ccache
-    - clang-3.4
+    - clang-3.5
     - cmake
     - g++-4.8
     - libgmp3-dev
@@ -35,7 +36,8 @@ before_install:
   - wget http://www.cmake.org/files/v3.2/cmake-3.2.1-Linux-x86_64.tar.gz
   - tar zxf cmake-3.2.1-Linux-x86_64.tar.gz
   - export PATH=`pwd`/cmake-3.2.1-Linux-x86_64/bin:$PATH
-  - if [ "$CXX" = "g++" ]; then export CC="gcc-4.8" CXX="g++-4.8"; fi
+  - if [ "$CC" = "clang" ]; then export CC="clang-3.5" CXX="clang++-3.5"; fi
+  - if [ "$CC" = "gcc" ]; then export CC="gcc-4.8" CXX="g++-4.8"; fi
 
 install:
   - git clone git://github.com/llvm-mirror/llvm.git ~/pyston_deps/llvm-trunk