.travis.yml: rationalise clang testing

As Travis includes Clang 5.0 in its own build environment there is no
point manually building with older Clangs. We still need to test with
the two pythons though so we leave them as minimal system only builds.
We also split the clang build into two as it often exceeds the 40
minute build time limit.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

.travis.yml

@@ -70,8 +70,10 @@ script:
   - make ${MAKEFLAGS} && ${TEST_CMD}
 matrix:
   include:
-    # Test with CLang for compile portability
+    # Test with Clang for compile portability (Travis uses clang-5.0)
-    - env: CONFIG=""
+    - env: CONFIG="--disable-system"
+      compiler: clang
+    - env: CONFIG="--disable-user"
       compiler: clang
     # gprof/gcov are GCC features
     - env: CONFIG="--enable-gprof --enable-gcov --disable-pie --disable-linux-user"
@@ -95,70 +97,13 @@ matrix:
     - env: CONFIG=""
       os: osx
       compiler: clang
-    # Plain Trusty System Build
+    # Python builds
-    - env: CONFIG="--disable-linux-user"
+    - env: CONFIG="--target-list=x86_64-softmmu"
-      sudo: required
-      addons:
-      dist: trusty
-      compiler: gcc
-      before_install:
-        - sudo apt-get update -qq
-        - sudo apt-get build-dep -qq qemu
-        - wget -O - http://people.linaro.org/~alex.bennee/qemu-submodule-git-seed.tar.xz | tar -xvJ
-        - git submodule update --init --recursive
-    # Plain Trusty Linux User Build
-    - env: CONFIG="--disable-system"
-      sudo: required
-      addons:
-      dist: trusty
-      compiler: gcc
-      before_install:
-        - sudo apt-get update -qq
-        - sudo apt-get build-dep -qq qemu
-        - wget -O - http://people.linaro.org/~alex.bennee/qemu-submodule-git-seed.tar.xz | tar -xvJ
-        - git submodule update --init --recursive
-    # Trusty System build with latest stable clang & python 3.0
-    - sudo: required
-      addons:
-      dist: trusty
-      language: generic
-      compiler: none
       python:
         - "3.0"
-      env:
+    - env: CONFIG="--target-list=x86_64-softmmu"
-        - COMPILER_NAME=clang CXX=clang++-3.9 CC=clang-3.9
-        - CONFIG="--disable-linux-user --cc=clang-3.9 --cxx=clang++-3.9 --python=/usr/bin/python3"
-      before_install:
-        - wget -nv -O - http://llvm.org/apt/llvm-snapshot.gpg.key | sudo apt-key add -
-        - sudo apt-add-repository -y 'deb http://llvm.org/apt/trusty llvm-toolchain-trusty-3.9 main'
-        - sudo apt-get update -qq
-        - sudo apt-get install -qq -y clang-3.9
-        - sudo apt-get build-dep -qq qemu
-        - wget -O - http://people.linaro.org/~alex.bennee/qemu-submodule-git-seed.tar.xz | tar -xvJ
-        - git submodule update --init --recursive
-      before_script:
-        - ./configure ${CONFIG} || cat config.log
-    # Trusty Linux User build with latest stable clang & python 3.6
-    - sudo: required
-      addons:
-      dist: trusty
-      language: generic
-      compiler: none
       python:
         - "3.6"
-      env:
-        - COMPILER_NAME=clang CXX=clang++-3.9 CC=clang-3.9
-        - CONFIG="--disable-system --cc=clang-3.9 --cxx=clang++-3.9 --python=/usr/bin/python3"
-      before_install:
-        - wget -nv -O - http://llvm.org/apt/llvm-snapshot.gpg.key | sudo apt-key add -
-        - sudo apt-add-repository -y 'deb http://llvm.org/apt/trusty llvm-toolchain-trusty-3.9 main'
-        - sudo apt-get update -qq
-        - sudo apt-get install -qq -y clang-3.9
-        - sudo apt-get build-dep -qq qemu
-        - wget -O - http://people.linaro.org/~alex.bennee/qemu-submodule-git-seed.tar.xz | tar -xvJ
-        - git submodule update --init --recursive
-      before_script:
-        - ./configure ${CONFIG} || cat config.log
     # Using newer GCC with sanitizers
     - addons:
         apt: