travis: use matching C++ for GCC version

When we use GCC 5.x, we need to install the C++ compiler and the C
compiler together because QEMU tests for feature flags against the C
compiler and assumes the C++ compiler has them. We also have to
ensure that GCC C++ is used. Have to do the modification of the CXX variable
in two steps to ensure we support older versions of bash in use by the
test machines. While we're at it simply how we select our compiler.

Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/.travis.yml b/.travis.yml
index 6803e2f00ea786146747f612c21512f9156f11eb..4bcd5a00794efdd50fa6acc5627c60ef8cc839c2 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,20 +14,20 @@ matrix:
           env: XEN_TARGET_ARCH=x86_64
         - compiler: gcc
           env: XEN_TARGET_ARCH=x86_64 XEN_CONFIG_EXPERT=y RANDCONFIG=y
-        - compiler: gcc
-          env: XEN_TARGET_ARCH=x86_64 COMPILER=gcc-5
+        - compiler: gcc-5
+          env: XEN_TARGET_ARCH=x86_64
         - compiler: gcc
           env: XEN_TARGET_ARCH=x86_64 debug=y
-        - compiler: gcc
-          env: XEN_TARGET_ARCH=x86_64 COMPILER=gcc-5 debug=y
+        - compiler: gcc-5
+          env: XEN_TARGET_ARCH=x86_64 debug=y
         - compiler: clang
           env: XEN_TARGET_ARCH=x86_64 clang=y
-        - compiler: clang
-          env: XEN_TARGET_ARCH=x86_64 COMPILER=clang-3.8 clang=y
+        - compiler: clang-3.8
+          env: XEN_TARGET_ARCH=x86_64 clang=y
         - compiler: clang
           env: XEN_TARGET_ARCH=x86_64 clang=y debug=y
-        - compiler: clang
-          env: XEN_TARGET_ARCH=x86_64 COMPILER=clang-3.8 clang=y debug=y
+        - compiler: clang-3.8
+          env: XEN_TARGET_ARCH=x86_64 clang=y debug=y
         - compiler: gcc
           env: XEN_TARGET_ARCH=arm32 CROSS_COMPILE=arm-linux-gnueabihf-
         - compiler: gcc
@@ -73,15 +73,18 @@ addons:
             - gcc-arm-linux-gnueabihf
             - gcc-aarch64-linux-gnu
             - gcc-5
+            - g++-5
             - clang-3.8
+# we must set CXX manually instead of using 'language: cpp' due to
+# travis-ci/travis-ci#3871
 before_script:
-    - export CC=${COMPILER:-${CC}}
-    - ${CC} --version
+    - export CXX=${CC/cc/++}
+    - export CXX=${CXX/clang/clang++}
 script:
     - ( [ "x${RANDCONFIG}" = "xy" ] && ( make -C xen randconfig )
       || exit 0 )
     - ( ./configure --disable-tools --disable-stubdom --enable-docs &&
-      make CC="${CROSS_COMPILE}${CC}" HOSTCC="${CC}" dist )
+      make dist )
 after_script:
     - cat xen/.config
 notifications: