Fix C++11 build. Enable C++11 in Travis.

.travis.yml

@@ -39,13 +39,13 @@ matrix:
           compiler: gcc
           env: GCC_VERSION=5 USE_CPP11=OFF
 
-#        - os: linux
-#          compiler: gcc
-#          env: GCC_VERSION=4.8 USE_CPP11=ON
+        - os: linux
+          compiler: gcc
+          env: GCC_VERSION=4.8 USE_CPP11=ON
 
-#        - os: linux
-#          compiler: gcc
-#          env: GCC_VERSION=5 USE_CPP11=ON
+        - os: linux
+          compiler: gcc
+          env: GCC_VERSION=5 USE_CPP11=ON
 
 script:
   - ./travis/build.sh

CMakeLists.txt

@@ -211,6 +211,12 @@ find_package (Boost 1.55 REQUIRED ${BOOST_NEEDED_LIBS})
 
 add_definitions (-DBOOST_FILESYSTEM_VERSION=3 -DBOOST_FILESYSTEM_NO_DEPRECATED)
 
+if (USE_CPP11)
+    # Workaround for undefined reference to boost::filesystem::detail::copy_file
+    # link error when building in C++11 mode.
+    add_definitions (-DBOOST_NO_CXX11_SCOPED_ENUMS)
+endif ()
+
 include_directories (SYSTEM ${Boost_INCLUDE_DIRS})
 link_directories (${Boost_LIBRARY_DIRS})
 

src/appleseed.cli/continuoussavingtilecallback.cpp

@@ -77,7 +77,7 @@ namespace
           : ProgressTileCallback(logger)
           , m_output_path(output_path)
         {
-            mt19937 rng(static_cast<uint32_t>(time(0)));
+            boost::mt19937 rng(static_cast<uint32_t>(time(0)));
             const uuids::uuid u = uuids::basic_random_generator<boost::mt19937>(&rng)();
             const bf::path ext = m_output_path.extension();
             const string tmp_filename = uuids::to_string(u) + ext.string();