Add travis builds for macOS

This also trims down the build matrix.

.travis.yml

@@ -2,15 +2,19 @@ language: cpp
 sudo: false
 
 # Build matrix:
+os:
+- linux
+- osx
 compiler:
-- gcc
 - clang
 env:
-- BUILD_METALIBS=OFF COMPOSITE_SOURCE_LIMIT=0
-- BUILD_METALIBS=ON COMPOSITE_SOURCE_LIMIT=0
-- BUILD_METALIBS=OFF COMPOSITE_SOURCE_LIMIT=30
 - BUILD_METALIBS=ON COMPOSITE_SOURCE_LIMIT=30
 - BUILD_METALIBS=ON COMPOSITE_SOURCE_LIMIT=30 PYTHON_INTERP=python2.7
+- BUILD_METALIBS=OFF COMPOSITE_SOURCE_LIMIT=30
+- BUILD_METALIBS=ON COMPOSITE_SOURCE_LIMIT=0
+matrix:
+  include:
+    - compiler: gcc
 
 addons:
   apt:
@@ -40,6 +44,7 @@ addons:
     - nvidia-cg-toolkit
     - python-dev
     - python3-dev
+    - python3-pip
     - python-virtualenv
     - zlib1g-dev
     - fakeroot
@@ -50,7 +55,13 @@ before_install:
 - makepanda/selfdestruct.py --yes
 
 install:
-- virtualenv --python=${PYTHON_INTERP:-python3.4} venv && source venv/bin/activate
+- >
+  if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then 
+    ./.travis/install_macos.sh;
+  else
+    virtualenv --python=${PYTHON_INTERP:-python3} venv;
+  fi
+- source venv/bin/activate
 - pip install pytest
 
 before_script:
@@ -58,7 +69,14 @@ before_script:
 - cd built
 
 script:
-- cmake -DHAVE_GTK2=NO -DBUILD_METALIBS=$BUILD_METALIBS -DCOMPOSITE_SOURCE_LIMIT=$COMPOSITE_SOURCE_LIMIT .. 
+- >
+  if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+    cmake -DHAVE_CARBON=NO -DOPENSSL_ROOT_DIR=/usr/local/Cellar/openssl/1.0.2o_1 \
+    -DBUILD_METALIBS=$BUILD_METALIBS -DCOMPOSITE_SOURCE_LIMIT=$COMPOSITE_SOURCE_LIMIT ..;
+  else
+    cmake -DHAVE_GTK2=NO -DBUILD_METALIBS=$BUILD_METALIBS \
+    -DCOMPOSITE_SOURCE_LIMIT=$COMPOSITE_SOURCE_LIMIT ..;
+  fi
 - make -j4
 
 - export PYTHONPATH=$PWD

.travis/install_macos.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+brew install python@3 eigen libtar fftw libsquish zlib ffmpeg freetype bullet \
+wxmac opencv assimp libvorbis openssl@1.0 || true
+brew install ode --with-shared
+
+# We can't trust brew to make the right symlinks, so execute commands as modules
+${PYTHON_INTERP:-python3} -m pip install virtualenv
+${PYTHON_INTERP:-python3} -m virtualenv --python=${PYTHON_INTERP:-python3} venv