gcc-4.6, clang-3.3

.travis.yml

@@ -7,15 +7,24 @@
 # to allow C++11, though we are not yet building with -std=c++11
 
 install:
-- if [ "$CXX" = "g++" ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
+# /usr/bin/gcc is 4.6 always, but gcc-X.Y is available.
+#- if [ "$CXX" = "g++" ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
+- if [ "$CXX" = "g++" ]; then export CXX="g++-4.6" CC="gcc-4.6"; fi
+# /usr/bin/clang is our version already, and clang-X.Y does not exist.
+#- if [ "$CXX" = "clang++" ]; then export CXX="clang++-3.3" CC="clang-3.3"; fi
+- echo ${PATH}
+- ls /usr/local
+- export PATH=/usr/bin:${PATH}
+- echo ${CXX}
+- ${CXX} --version
 addons:
   apt:
     sources:
     - ubuntu-toolchain-r-test
     packages:
-    - gcc-4.8
-    - g++-4.8
-    - clang
+    - gcc-4.6
+    - g++-4.6
+    - clang-3.3
     - valgrind
 os:
   - linux