Use prebuilt llvm but build spirv translator from source

Author: fzou1

.travis.yml

@@ -8,7 +8,6 @@ dist: xenial
 
 git:
   depth: 1
-  quiet: true
 
 branches:
   only:
@@ -21,20 +20,28 @@ env:
     - BUILD_TYPE=Release
     - BUILD_TYPE=Debug
 
+addons:
+  apt:
+    sources:
+      - sourceline: 'deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-8 main'
+        key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
+      - ubuntu-toolchain-r-test
+    packages:
+      - llvm-8-tools
+      - llvm-8-dev
+      - libclang-8-dev
 
 install:
-  - git clone https://github.com/llvm-mirror/llvm.git -b release_80
-  - cd ./llvm/tools
-  - git clone https://github.com/llvm-mirror/clang.git -b release_80
-  - cd ../projects
-  - git clone https://github.com/KhronosGroup/SPIRV-LLVM-Translator.git -b llvm_release_80 llvm-spirv
-  - git clone https://github.com/intel/opencl-clang.git -b ocl-open-80
-  - cd ../..
+  - git clone https://github.com/KhronosGroup/SPIRV-LLVM-Translator.git -b llvm_release_80 spirv-llvm-translator
+  - mkdir spirv-llvm-translator/build && cd spirv-llvm-translator/build
+  - cmake .. -DCMAKE_INSTALL_PREFIX=./install && make -j`nproc` && make install
+  - cd ../../
 
 compiler:
   - gcc
+  - clang
 
 script:
   - mkdir build && cd build
-  - cmake -DCMAKE_BUILD_TYPE=${BUILD_TYPE} -DLLVM_NO_DEAD_STRIP=ON --DCMAKE_INSTALL_PREFIX=./install ../llvm
+  - cmake -DCMAKE_BUILD_TYPE=${BUILD_TYPE} -DLLVM_NO_DEAD_STRIP=ON -DLLVMSPIRV_INCLUDED_IN_LLVM=OFF -DSPIRV_TRANSLATOR_DIR=../spirv-llvm-translator -DSPIRV_SOURCE_DIR=../spirv-llvm-translator/build/install ../
   - make -j`nproc`