Merge pull request #3793 from yurivict/master

Fixed missing -lc++abi on FreeBSD.

CMakeLists.txt

@@ -89,8 +89,10 @@ elseif(CMAKE_COMPILER_IS_GNUCXX)
 elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
   set(CMAKE_CXX_FLAGS
       "${CMAKE_CXX_FLAGS} -std=c++0x -stdlib=libc++ -Wall -pedantic -Werror -Wextra")
+  if(NOT "${CMAKE_SYSTEM_NAME}" MATCHES "FreeBSD")
     set(CMAKE_EXE_LINKER_FLAGS
         "${CMAKE_EXE_LINKER_FLAGS} -lc++abi")
+  endif()
 endif()
 
 if(FLATBUFFERS_CODE_COVERAGE)