use clang 3.8 from mason

circle.yml

@@ -7,7 +7,7 @@ machine:
     JOBS: 8
     CCACHE_TEMPDIR: /tmp/.ccache-temp
     CCACHE_COMPRESS: 1
-    LLVM_VERSION: 3.7
+    LLVM_VERSION: 3.8
   pre:
     - echo "here"
   post:
@@ -25,12 +25,9 @@ dependencies:
   pre:
     # https://discuss.circleci.com/t/add-ability-to-cache-apt-get-programs/598/3
     - sudo rm -rf /var/cache/apt/archives && sudo ln -s ~/.apt-cache /var/cache/apt/archives && mkdir -p ~/.apt-cache/partial
-    - sudo wget -O - http://llvm.org/apt/llvm-snapshot.gpg.key | sudo apt-key add -
-    - sudo add-apt-repository -y "deb http://llvm.org/apt/precise/ llvm-toolchain-precise-${LLVM_VERSION} main"
     - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
-    - sudo apt-get update -y
   override:
-    - sudo apt-get install clang-${LLVM_VERSION} -y
+    - sudo apt-get update -y
   post:
     - which clang-${LLVM_VERSION}
     - which clang++-${LLVM_VERSION}
@@ -38,7 +35,9 @@ dependencies:
 database:
   pre:
     - ./bootstrap.sh
-    - ./configure CC="clang-${LLVM_VERSION}" CXX="$(pwd)/mason_packages/.link/bin/ccache clang++-${LLVM_VERSION} -Qunused-arguments"
+    - ./.mason/mason install clang ${LLVM_VERSION}.0
+    - ./.mason/mason link clang ${LLVM_VERSION}.0
+    - ./configure CC="$(pwd)/mason_packages/.link/bin/clang-${LLVM_VERSION}" CXX="$(pwd)/mason_packages/.link/bin/ccache $(pwd)/mason_packages/.link/bin/clang++-${LLVM_VERSION} -Qunused-arguments"
     - make
   override:
     - psql -c 'create database template_postgis;'