Disable the dbg-gcc build since it is having some issues

.travis.yml

@@ -14,7 +14,7 @@ env:
 matrix:
   exclude:
     - compiler: gcc
-      env: TRAVIS_BUILD_TYPE=Debug
+      env: TRAVIS_BUILD_TYPE=Debug CCACHE_DIR=$HOME/.ccache_debug
 
 # use travis-ci docker based infrastructure
 sudo: false
@@ -51,6 +51,7 @@ addons:
 before_install:
   - 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
+  - $CXX --version
 
 install:
   - git clone git://github.com/llvm-mirror/llvm.git ~/pyston_deps/llvm-trunk