travis: Require Ubuntu 18.04 to pass, fix on ppc64le

Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

.travis.yml

@@ -27,7 +27,6 @@ matrix:
   allow_failures:
     - env: RUN_ON_CONTAINER=fedora-rawhide
     - env: RUN_ON_CONTAINER=debian-unstable
-    - env: RUN_ON_CONTAINER=ubuntu-18.04
   exclude:
     - os: linux-ppc64le
       env: RUN_ON_CONTAINER=ubuntu-12.04

opal-ci/Dockerfile-ubuntu-18.04

@@ -1,7 +1,8 @@
 FROM ubuntu:18.04
 ENV DEBIAN_FRONTEND    noninteractive
 RUN if [ `arch` != "ppc64le" ]; then apt-get update -qq && apt-get install -y gcc-powerpc64le-linux-gnu; fi
-RUN apt-get update -qq && apt-get install -y gcc ccache expect libssl-dev wget curl xterm device-tree-compiler build-essential gcc python g++ pkg-config libz-dev libglib2.0-dev libpixman-1-dev libfdt-dev git libstdc++6 valgrind libtcl8.6 gcc-arm-linux-gnueabi clang qemu-system-ppc
+RUN apt-get update -qq && apt-get install -y gcc-arm-linux-gnueabi || true
+RUN apt-get update -qq && apt-get install -y gcc ccache expect libssl-dev wget curl xterm device-tree-compiler build-essential gcc python g++ pkg-config libz-dev libglib2.0-dev libpixman-1-dev libfdt-dev git libstdc++6 valgrind libtcl8.6 clang qemu-system-ppc
 RUN if [ `arch` = "x86_64" ]; then curl -L -O http://public.dhe.ibm.com/software/server/powerfuncsim/p8/packages/v1.0-2/systemsim-p8_1.0-2_amd64.deb; dpkg -i systemsim-p8_1.0-2_amd64.deb; fi
 RUN if [ `arch` = "x86_64" ]; then curl -O http://public.dhe.ibm.com/software/server/powerfuncsim/p9/packages/v1.1-0/systemsim-p9-1.1-0-trusty_amd64.deb; dpkg -i systemsim-p9-1.1-0-trusty_amd64.deb; fi
 COPY . /build/

opal-ci/build-ubuntu-18.04.sh

@@ -12,11 +12,14 @@ make -j${MAKE_J} all
 ./opal-ci/fetch-debian-jessie-installer.sh
 make -j${MAKE_J} check
 (make clean; cd external/gard && CROSS= make -j${MAKE_J})
-( cd external/pflash;
-  echo "Building for ARM..."
-  make clean && make distclean
-  CROSS_COMPILE=arm-linux-gnueabi-  make || { echo "ARM build failed"; exit 1; }
-)
+# because some ppc64le versions don't have arm cross compiler
+if which arm-linux-gnueabi-gcc; then
+    ( cd external/pflash;
+      echo "Building for ARM..."
+      make clean && make distclean
+      CROSS_COMPILE=arm-linux-gnueabi-  make || { echo "ARM build failed"; exit 1; }
+    )
+fi
 (cd external/pflash; make clean && make distclean && make)
 make clean
 SKIBOOT_GCOV=1 make -j${MAKE_J}