ci: Enable builds on macOS

Use Travis's macOS builder to check if Epoxy is building on that
platform.

.travis.yml

@@ -7,6 +7,7 @@ branches:
 
 os:
   - linux
+  - osx
 
 compiler:
   - gcc
@@ -18,13 +19,29 @@ language:
 services:
   - docker
 
+matrix:
+  exclude:
+  - os: osx
+    compiler: gcc
+
 before_install:
-  - docker pull ebassi/epoxyci
+  - |
+    if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+      brew update
+      brew install python@3 meson
+      # Use a Ninja with QuLogic's patch: https://github.com/ninja-build/ninja/issues/1219
+      mkdir -p $HOME/tools; curl -L http://nirbheek.in/files/binaries/ninja/macos/ninja -o $HOME/tools/ninja; chmod +x $HOME/tools/ninja
+    fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then docker pull ebassi/epoxyci ; fi
 
 before_script:
-  - echo FROM ebassi/epoxyci > Dockerfile
-  - echo ADD . /root >> Dockerfile
-  - docker build -t withgit .
+  - |
+    if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
+      echo FROM ebassi/epoxyci > Dockerfile
+      echo ADD . /root >> Dockerfile
+      echo WORKDIR /root >> Dockerfile
+      docker build -t withgit .
+    fi
 
 env:
   - BUILD_OPTS=""
@@ -33,4 +50,5 @@ env:
   - BUILD_OPTS="-Dx11=false"
 
 script:
-  - docker run withgit /bin/sh -c "CC=$CC ./epoxy-run-tests.sh $BUILD_OPTS"
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then docker run withgit /bin/sh -c "CC=$CC .travis/epoxy-ci-linux.sh $BUILD_OPTS" ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then /bin/sh -c "CC=$CC .travis/epoxy-ci-osx.sh $BUILD_OPTS" ; fi

.travis/epoxy-ci-osx.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+export SDKROOT=$( xcodebuild -version -sdk macosx Path )
+export CPPFLAGS=-I/usr/local/include
+export LDFLAGS=-L/usr/local/lib
+export OBJC=$CC
+export PATH=$HOME/tools:$PATH
+
+srcdir=$( pwd )
+builddir=$( mktemp -d build_XXXXXX )
+
+meson ${BUILDOPTS} $builddir $srcdir || exit $?
+
+cd $builddir
+ninja || exit $?
+meson test || exit $?
+cd ..
+
+rm -rf $builddir