travis: Compile on macOS 10.13 with more up to date compiler

.travis.yml

@@ -24,7 +24,7 @@ matrix:
     - os: osx
       env: NAME="macos build"
       sudo: false
-      osx_image: xcode10.2
+      osx_image: xcode10
       install: "./.travis/macos/deps.sh"
       script: "./.travis/macos/build.sh"
       after_success: "./.travis/macos/upload.sh"

.travis/macos/build.sh

@@ -5,7 +5,12 @@ set -o pipefail
 export MACOSX_DEPLOYMENT_TARGET=10.14
 export Qt5_DIR=$(brew --prefix)/opt/qt5
 export UNICORNDIR=$(pwd)/externals/unicorn
-export PATH="/usr/local/opt/ccache/libexec:$PATH"
+export PATH="/usr/local/opt/ccache/libexec:/usr/local/opt/llvm/bin:$PATH"
+
+export CC="clang"
+export CXX="clang++"
+export LDFLAGS="-L/usr/local/opt/llvm/lib"
+export CPPFLAGS="-I/usr/local/opt/llvm/include"
 
 # TODO: Build using ninja instead of make
 mkdir build && cd build

.travis/macos/deps.sh

@@ -1,6 +1,6 @@
 #!/bin/sh -ex
 
 brew update
-brew install p7zip qt5 sdl2 ccache
+brew install p7zip qt5 sdl2 ccache llvm
 brew outdated cmake || brew upgrade cmake
 pip3 install macpack