factor: Install libc++

.travis.yml

@@ -31,6 +31,7 @@ addons:
       - cmake
       - libaio-dev
       - libsnappy-dev
+      - libc++-dev
 before_install:
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then ./build.sh deps-macosx ; else ./build.sh deps-apt-get ; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew ls --versions snappy > /dev/null || brew install snappy; fi

vm/Config.unix

@@ -12,7 +12,7 @@ PLAF_DLL_OBJS = vm/os-unix.o
 PLAF_EXE_OBJS += vm/main-unix.o
 PLAF_MASTER_HEADERS += vm/os-unix.hpp
 
-FFI_TEST_CFLAGS = -fPIC
+FFI_TEST_CFLAGS = -fPIC -stdlib=libc++
 
 # LINKER = gcc -shared -o
 # LINK_WITH_ENGINE = '-Wl,-rpath,$$ORIGIN' -lfactor