Update Travis.

.travis.yml

@@ -19,7 +19,9 @@ notifications: { email: { on_success: never, on_failure: change } }
 # Ubuntu 14.04 LTS "Trusty"
 .ubuntu_trusty_toolchain_sources: &TS
   - ubuntu-toolchain-r-test
+  - llvm-toolchain-trusty-4.0
   - llvm-toolchain-trusty-5.0
+  - llvm-toolchain-trusty-6.0
 
 env:
   global:
@@ -133,6 +135,16 @@ matrix:
       compiler: gcc
       env: C=gcc-7-m64
       addons: { apt: { sources: *TS, packages: [ "g++-7" ] } }
+    - os: linux
+      dist: trusty
+      compiler: gcc
+      env: C=gcc-8-m32
+      addons: { apt: { sources: *TS, packages: [ "g++-8-multilib", "zlib1g-dev:i386" ] } }
+    - os: linux
+      dist: trusty
+      compiler: gcc
+      env: C=gcc-8-m64
+      addons: { apt: { sources: *TS, packages: [ "g++-8" ] } }
     - os: linux
       compiler: clang
       env: C=clang-3.4-m32
@@ -196,6 +208,16 @@ matrix:
       compiler: clang
       env: C=clang-3.9-m64 B=scan-build
       addons: { apt: { sources: *PS, packages: [ "clang-3.9" ] } }
+    - os: linux
+      dist: trusty
+      compiler: clang
+      env: C=clang-4.0-m32
+      addons: { apt: { sources: *TS, packages: [ "clang-4.0", "g++-7-multilib", "zlib1g-dev:i386" ] } }
+    - os: linux
+      dist: trusty
+      compiler: clang
+      env: C=clang-4.0-m64
+      addons: { apt: { sources: *TS, packages: [ "clang-4.0" ] } }
     - os: linux
       dist: trusty
       compiler: clang
@@ -206,6 +228,16 @@ matrix:
       compiler: clang
       env: C=clang-5.0-m64
       addons: { apt: { sources: *TS, packages: [ "clang-5.0" ] } }
+    - os: linux
+      dist: trusty
+      compiler: clang
+      env: C=clang-6.0-m32
+      addons: { apt: { sources: *TS, packages: [ "clang-6.0", "g++-7-multilib", "zlib1g-dev:i386" ] } }
+    - os: linux
+      dist: trusty
+      compiler: clang
+      env: C=clang-6.0-m64
+      addons: { apt: { sources: *TS, packages: [ "clang-6.0" ] } }
     - os: linux
       compiler: gcc
       env: CROSS=arm-linux-gnueabi C=gcc-4.6 T=qemu
@@ -249,13 +281,21 @@ matrix:
       compiler: clang
       env: C=clang-802-m64
     - os: osx
-      osx_image: xcode9.2
+      osx_image: xcode9.4
       compiler: clang
-      env: C=clang-900-m32
+      env: C=clang-902-m32
     - os: osx
-      osx_image: xcode9.2
+      osx_image: xcode9.4
       compiler: clang
-      env: C=clang-900-m64
+      env: C=clang-902-m64
+    - os: osx
+      osx_image: xcode10
+      compiler: clang
+      env: C=clang-1000-m32
+    - os: osx
+      osx_image: xcode10
+      compiler: clang
+      env: C=clang-1000-m64
 
 install:
   - uname -a; pwd; id; umask