[PATCH] travis.yml: Use clang++ in the Clang tests

[Thomas Huth <thuth@redhat.com>]

Our configure script does not look for clang++ automatically, so we
should use --cxx=clang++ to make sure that we test our C++ code with
Clang, too. And while we're at it, also use --host-cc=clang here
to avoid that we use the normal "cc" as host C compiler.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 .travis.yml | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 1ec8a7b465..564be50a3c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -205,14 +205,15 @@ jobs:
     # Test with Clang for compile portability (Travis uses clang-5.0)
     - name: "Clang (user)"
       env:
-        - CONFIG="--disable-system"
+        - CONFIG="--disable-system --host-cc=clang --cxx=clang++"
         - CACHE_NAME="${TRAVIS_BRANCH}-linux-clang-default"
       compiler: clang
 
 
     - name: "Clang (main-softmmu)"
       env:
-        - CONFIG="--target-list=${MAIN_SOFTMMU_TARGETS} "
+        - CONFIG="--target-list=${MAIN_SOFTMMU_TARGETS}
+                  --host-cc=clang --cxx=clang++"
         - CACHE_NAME="${TRAVIS_BRANCH}-linux-clang-sanitize"
       compiler: clang
       before_script:
@@ -222,7 +223,8 @@ jobs:
 
     - name: "Clang (other-softmmu)"
       env:
-        - CONFIG="--disable-user --target-list-exclude=${MAIN_SOFTMMU_TARGETS}"
+        - CONFIG="--disable-user --target-list-exclude=${MAIN_SOFTMMU_TARGETS}
+                  --host-cc=clang --cxx=clang++"
         - CACHE_NAME="${TRAVIS_BRANCH}-linux-clang-default"
       compiler: clang
 
-- 
2.18.1