The osx/gcc build on travis actually uses gcc

.travis.yml

@@ -22,8 +22,10 @@ addons:
     - libcrypto++-dev
     - libfuse-dev
 install:
-# Use new clang
+# Use new clang on linux
 - if [ "${TRAVIS_OS_NAME}" == "linux" ] && [ "$CXX" = "clang++" ]; then export CXX="clang++-3.7" CC="clang-3.7"; fi
+# If using gcc on mac, actually use it ("gcc" just links to clang, but "gcc-4.8" is gcc, https://github.com/travis-ci/travis-ci/issues/2423)
+- if [ "${TRAVIS_OS_NAME}" == "osx" ] && ["${CXX}" = "g++" ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
 # Detect number of CPU cores
 - export NUMCORES=`grep -c ^processor /proc/cpuinfo` && if [ ! -n "$NUMCORES" ]; then export NUMCORES=`sysctl -n hw.ncpu`; fi
 - echo Using $NUMCORES cores