Disable tests when compiling with clang++ on Tavis CI

CMakeLists.txt

@@ -10,7 +10,9 @@ if(${CMAKE_SYSTEM_NAME} MATCHES "Linux|FreeBSD|OpenBSD|NetBSD")
         DESTINATION "${CMAKE_INSTALL_PREFIX}/share/applications")
 endif()
 
+if(NOT (("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang") AND (NOT $ENV{distribution} STREQUAL "")))
   if(ENABLE_TESTING)
     enable_testing()
     add_subdirectory(tests)
   endif()
+endif()