osrm-backend/third_party/mason/scripts/clang/3.8.0

Clang++ v3.8.0

This clang++ package depends on and defaults to compiling C++ programs against libstdc++.

For clang++ itself to be able to run and compile C++ programs you need to upgrade the libstdc++ version.

You also need to upgrade the libstdc++ for the programs to run that you compile with this version of clang++.

You can do this on Travis like:

      addons:
        apt:
          sources: [ 'ubuntu-toolchain-r-test' ]
          packages: [ 'libstdc++-5-dev' ]

You can do this on any debian system like:

add-apt-repository -y ppa:ubuntu-toolchain-r/test
apt-get update -y
apt-get install -y libstdc++-5-dev

A full example of installing clang and upgrading libstdc++ on travis is:

language: generic

matrix:
  include:
    - os: linux
      sudo: false
      env: CXX=clang++
      addons:
        apt:
          sources: [ 'ubuntu-toolchain-r-test' ]
          packages: [ 'libstdc++-5-dev' ]

install:
  - git clone --depth 1 https://github.com/mapbox/mason
  - ./.mason/mason install clang 3.8.0
  - export PATH=$(./.mason/mason prefix clang 3.8.0)/bin:${PATH}
  - which clang++

Note: Installing libstdc++-5-dev installs a library named libstdc++6. This is not version 6, it is the ABI 6. Note that there is no dash between the ++ and the 6 like there is between the ++ and the 5 in the dev package. So don't worry about the mismatch of 5 and 6. While the package name is based on the g++ version (5) the actual library version used, at the time of this writing, is v6.1.1 (this comes from https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test/+packages). The 6 again is ABI not version: even the libstdc++ v4.6.3 package (the default on Ubuntu precise) is named/aliased to libstdc++6

If you hit a runtime error like /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version GLIBCXX_3.4.20' not found it means you forgot to upgrade libstdc++6 to at least v6.1.1.