Set compiler mode to C++11 and add link dependency from gecodeflatzinc to gecodegist

Author: guidotack

CMakeLists.txt

@@ -55,6 +55,21 @@ if (GECODE_DISABLE_WARNINGS)
   endif ()
 endif ()
 
+if ( (CMAKE_VERSION VERSION_GREATER 3.1.0) OR (CMAKE_VERSION VERSION_EQUAL 3.1.0) )
+  set (CMAKE_CXX_STANDARD 11)
+endif()
+check_cxx_compiler_flag(-std=c++11 HAS_STDCPP11)
+if (HAS_STDCPP11)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+else()
+  check_cxx_compiler_flag(-std=c++0x HAS_STDCPP0X)
+  if (HAS_STDCPP0X)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
+  else()
+    message("Warning: Initial check for C++11 unsuccessful. This is fine if HAS_CPP11 test below succeeds.")
+  endif()
+endif()
+
 # The following part of config.h is hard to derive from configure.ac.
 file(READ gecode/support/config.hpp.in CONFIG)
 string(REGEX REPLACE "^/\\*([^*]|\\*[^/])*\\*/" "" CONFIG ${CONFIG})
@@ -387,6 +402,7 @@ if (GECODE_HAS_QT)
   if (Qt5_FOUND)
     qt5_use_modules(gecodegist Widgets Gui PrintSupport)
     qt5_use_modules(gecodeflatzinc Core)
+    target_link_libraries(gecodeflatzinc gecodegist)
   else()
     target_link_libraries(gecodegist ${QT_LIBRARIES})
     target_link_libraries(gecodeflatzinc gecodegist ${QT_LIBRARIES})