compile cpp example with g++ 4.8

.travis.yml

@@ -80,17 +80,17 @@ script:
 - cp open62541-linux64.tar.gz ..
 - cp open62541.h .. #copy single file-release
 - cp open62541.c .. #copy single file-release
-- echo "Building the C++ example"
-- gcc -std=c99 -c open62541.c
-- g++ ../examples/server.cpp -I./ open62541.o -o cpp-server
-- cd .. && rm build -rf && mkdir -p build && cd build
 - echo "Upgrade to gcc 4.8"
 - sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
 - sudo apt-get update -qq
-- sudo apt-get install -qq gcc-4.8 valgrind
+- sudo apt-get install -qq gcc-4.8 g++-4.8 valgrind
 - sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 20
 - sudo update-alternatives --config gcc
 - echo "Compile multithreaded version"
+- echo "Building the C++ example"
+- gcc -std=c99 -c open62541.c
+- g++-4.8 ../examples/server.cpp -I./ open62541.o -o cpp-server
+- cd .. && rm build -rf && mkdir -p build && cd build
 - cmake -DENABLE_MULTITHREADING=ON -DBUILD_EXAMPLESERVER=ON ..
 - make 
 - cd .. && rm build -rf && mkdir -p build && cd build