Noissue - Use clang++ and libc++ on Linux

.travis.yml

 language: cpp
 
 os:
   - linux
   - osx
 
 dist: trusty
 sudo: false
 
+compiler: clang
+
 addons:
   apt:
     sources:
     - 'ubuntu-toolchain-r-test'
+    - llvm-toolchain-trusty-4.0
     packages:
     - binutils-gold
     - libcurl4-openssl-dev
     - g++-7
     - p7zip-full
+    - clang-4.0
 
 python: '2.7'
 
 env:
   global:
   - URL_PREFIX=https://v8.eyeofiles.com/v8-4fc9a2fe7f8a7ef1e7966185b39b3b541792669a/
   - ANDROID_NDK_ROOT=${TRAVIS_BUILD_DIR}/third_party/android-ndk-r16b
   matrix:
   - BUILD_ACTION=test
   - BUILD_ACTION=all TARGET_OS=android Configuration=release ABP_TARGET_ARCH=arm
   - BUILD_ACTION=all TARGET_OS=android Configuration=release ABP_TARGET_ARCH=arm64
   - BUILD_ACTION=all TARGET_OS=android Configuration=release ABP_TARGET_ARCH=ia32
 
 before_script:
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install p7zip; fi
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then export CXX=g++-7 CC=gcc-7; fi
   - make get-prebuilt-v8
   - ./ensure_dependencies.py
   - if [[ "${TARGET_OS}" == "android" && "$TRAVIS_OS_NAME" == "linux" ]]; then wget https://dl.google.com/android/repository/android-ndk-r16b-linux-x86_64.zip -O third_party/android-ndk.zip ; fi
   - if [[ "${TARGET_OS}" == "android" && "$TRAVIS_OS_NAME" == "osx" ]]; then wget https://dl.google.com/android/repository/android-ndk-r16b-darwin-x86_64.zip -O third_party/android-ndk.zip ; fi
   - if [[ "${TARGET_OS}" == "android" ]]; then unzip -q third_party/android-ndk.zip -d third_party/ ; fi
 
 script:
   - make ${BUILD_ACTION}
 
 notifications:
   email: false