opal-ci: Additionally build with clang on Ubuntu 18.04
Now that skiboot supports building with clang we can use a modern distro
to cross compile using that compiler. Ubuntu 18.04 ships with clang 6,
so start with that.
@@ -27,3 +27,8 @@ rm -rf builddir
mkdir builddir
make SRC=`pwd` -f ../Makefile -C builddir -j${MAKE_J}
make clean
+
+echo "Building with clang..."
+make clean
+make -j${MAKE_J} CC=clang
+make -j${MAKE_J} CC=clang check
