language: cpp
compiler:
  # Comment out for now to keep build matrix small
  # - clang
  - gcc
addons:
  apt:
    sources:
      - sourceline: 'deb https://apt.kitware.com/ubuntu/ bionic main'
        key_url: 'https://apt.kitware.com/keys/kitware-archive-latest.asc'
    packages:
      - libpng-dev # Get libpng for the tutorials and apps
      - cmake      # For modern CMake build
      - doxygen    # For generating docs
env:
  global:
    # The Travis Ubuntu Bionic environment we run in currently promises 2 cores.
    # We'll run at -j4 on the assumption that there's enough I/O bound work
    # for that to be profitable.
    - MAKEFLAGS=-j4
  matrix:
    # Configurations
    #
    # Each line in the ``env`` section represents a set of environment
    # variables passed to a build configuration
    #
    # Test a mix of llvm versions, a mix of build systems, and a mix of shared vs static library
    # Don't build as a static library with cmake. It risks exceeding the travis memory limit.
    #
    # Note that gcc7.4 is the default install on Travis Bionic, so we'll just use that.
    #
    # TODO: Repeating these env vars on each line is ugly but AFAICT Travis doesn't
    # allow a simple way to avoid this. If the built matrix ever gets more complex
    # this will definitely need improvement, but for now, it's simpler to just
    - LLVM_VERSION=10.0.0 BUILD_SYSTEM=MAKE LLVM_URL_ROOT=https://github.com/llvm/llvm-project/releases/download/llvmorg-10.0.0
    - LLVM_VERSION=10.0.0 BUILD_SYSTEM=CMAKE HALIDE_SHARED_LIBRARY=ON LLVM_URL_ROOT=https://github.com/llvm/llvm-project/releases/download/llvmorg-10.0.0

    # Just one version of LLVM9 should suffice.
    # (Note that there is a build of LLVM9.0.1 on the github releases site,
    # but only for ubuntu-16.)
    - LLVM_VERSION=9.0.0 BUILD_SYSTEM=MAKE LLVM_URL_ROOT=https://releases.llvm.org/9.0.0

cache: ccache
dist: bionic
install:
  # Download the right llvm release.
  - wget ${LLVM_URL_ROOT}/clang+llvm-${LLVM_VERSION}-x86_64-linux-gnu-ubuntu-18.04.tar.xz
  - tar xvf clang+llvm-${LLVM_VERSION}-x86_64-linux-gnu-ubuntu-18.04.tar.xz
  - sudo mv clang+llvm-${LLVM_VERSION}-x86_64-linux-gnu-ubuntu-18.04 /usr/local/llvm
script:
  - test/scripts/build_travis.sh