Build with GCC 7 on CI

Author: azuresol

.travis.yml

@@ -25,6 +25,7 @@ env:
     - VER_CXX=g++-5 DEBUG=1
     - VER_CXX=g++-5 TAG_SUFFIX=_32              # 32bit build
     - VER_CXX=g++-6
+    - VER_CXX=g++-7
 
 before_install:
   - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test

env/Dockerfile.m4

@@ -21,7 +21,7 @@ RUN cd /build && \
 	git clone -b ${BESS_DPDK_BRANCH} https://github.com/netsys/bess && \
 	cd /build/bess && \
 	setarch ${DPDK_ARCH} ./build.py dpdk && \
-	mv /build/bess/deps/dpdk-17.02 /build/dpdk-17.02 && \
+	mv /build/bess/deps/dpdk-17.05 /build/dpdk-17.05 && \
 	rm -rf /build/bess
 
 WORKDIR /build/bess

env/packages.yml

@@ -14,6 +14,7 @@
         - g++-4.8
         - g++-5
         - g++-6
+        - g++-7
         - g++
         - clang-3.8
         - autoconf

env/rebuild_images.py

@@ -71,5 +71,6 @@ def main(argv):
 
     return 0
 
+
 if __name__ == '__main__':
     sys.exit(main(sys.argv))