fix: Your C++ compiler does NOT fully support C++11

Author: TTWShell

.travis.yml

@@ -12,9 +12,35 @@ before_install:
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get update -qq; fi
 
 install:
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get install -y cmake gcc-4.8 g++-4.8 clang golang; fi
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then export CXX="g++-4.8" CC="gcc-4.8" GOROOT="/usr/lib/go" GOPATH=$HOME/gocode PATH=$PATH:$GOPATH/bin; fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get install -y clang golang; fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then export CXX="g++-4.9" CC="gcc-4.9" GOROOT="/usr/lib/go" GOPATH=$HOME/gocode PATH=$PATH:$GOPATH/bin; fi
 
+addons:
+  apt:
+    sources:
+     # The Travis apt source whitelist can be found here:
+     #   https://github.com/travis-ci/apt-source-whitelist/blob/master/ubuntu.json
+     - ubuntu-toolchain-r-test  # for new libstdc++
+     - george-edison55-precise-backports # for a more recent version of cmake (3.2.3)
+    packages:
+     - cmake-data
+     - cmake
+     # 4.9 is the first version of GCC with good enough C++11 support to build
+     # ycmd.
+     - g++-4.9
+     - ninja-build
+     # Everything below is a Python build dep (though it depends on Python
+     # version). We need them because pyenv builds Python.
+     - libssl-dev
+     - zlib1g-dev
+     - libbz2-dev
+     - libreadline-dev
+     - libsqlite3-dev
+     - wget
+     - curl
+     - llvm
+     - libncurses5-dev
+     - libncursesw5-dev
 
 compiler:
   - gcc