Merge pull request #5092 from commitay/xcode10

azure/travis: update to xcode 10

.travis.yml

@@ -15,7 +15,7 @@ matrix:
   fast_finish: true
   include:
     - os: osx
-      osx_image: xcode9.4
+      osx_image: xcode10
     - os: linux
       sudo: false
 

azure-pipelines.yml

@@ -4,6 +4,7 @@ jobs:
     vmImage: xcode9-macos10.13
   steps:
     - bash: |
+        sudo xcode-select --switch /Applications/Xcode_10.app/Contents/Developer
         HOMEBREW_REPOSITORY="$(brew --repo)"
         mv "$HOMEBREW_REPOSITORY/Library/Taps" "$PWD/Library"
         sudo rm -rf "$HOMEBREW_REPOSITORY"