message: Re-enable clang and OSX.
diff: @@ -4,11 +4,11 @@ language: cpp
  compiler:
  - gcc
  -# - clang
  + - clang
  os:
  - linux
  -# - osx
  + - osx
  env:
  global:
  @@ -18,17 +18,17 @@ env:
  MPI=YES
  CODECOV=YES
  MFEM_TEST_TARGET=test
  -# - DEBUG=NO
  -# MPI=YES
  -# CODECOV=NO
  -# MFEM_TEST_TARGET=test
  -# - DEBUG=YES
  -# MPI=NO
  -# CODECOV=YES
  -# MFEM_TEST_TARGET=check
  -# - DEBUG=NO
  -# MPI=NO
  -# MFEM_TEST_TARGET=test
  + - DEBUG=NO
  + MPI=YES
  + CODECOV=NO
  + MFEM_TEST_TARGET=test
  + - DEBUG=YES
  + MPI=NO
  + CODECOV=YES
  + MFEM_TEST_TARGET=check
  + - DEBUG=NO
  + MPI=NO
  + MFEM_TEST_TARGET=test
  addons:
  apt:
  @@ -65,11 +65,13 @@ before_install:
  fi
  # Update environment to find g++ 4.9 installation first.
  - - mkdir -p latest-gcc-symlinks
  - - ln -s /usr/bin/g++-4.9 latest-gcc-symlinks/g++
  - - ln -s /usr/bin/gcc-4.9 latest-gcc-symlinks/gcc
  - - ln -s /usr/bin/gcov-4.9 latest-gcc-symlinks/gcov
  - - export PATH=$PWD/latest-gcc-symlinks:$PATH
  + - if [ $TRAVIS_OS_NAME == "linux" ]; then
  + mkdir -p latest-gcc-symlinks;
  + ln -s /usr/bin/g++-4.9 latest-gcc-symlinks/g++;
  + ln -s /usr/bin/gcc-4.9 latest-gcc-symlinks/gcc;
  + ln -s /usr/bin/gcov-4.9 latest-gcc-symlinks/gcov;
  + export PATH=$PWD/latest-gcc-symlinks:$PATH;
  + fi
  install:
  # Back out of the mfem directory to install the libraries
  