Make thrift metadata available across fbcode oss builds.

Summary: There are downstream oss builds showing build failure caused by introduction of metadata. We want to make them proceed to build so we won't get errors in CI.

Reviewed By: iahs

Differential Revision: D19900007

fbshipit-source-id: 4201448f7980b53e407fd2bc1c74ed4ffa8e18c1

build/fbcode_builder/CMake/FBThriftCppLibrary.cmake

@@ -62,12 +62,14 @@ function(add_fbthrift_cpp_library LIB_NAME THRIFT_FILE)
     "${output_dir}/gen-cpp2/${base}_types.h"
     "${output_dir}/gen-cpp2/${base}_types.tcc"
     "${output_dir}/gen-cpp2/${base}_types_custom_protocol.h"
+    "${output_dir}/gen-cpp2/${base}_metadata.h"
   )
   list(APPEND generated_sources
     "${output_dir}/gen-cpp2/${base}_constants.cpp"
     "${output_dir}/gen-cpp2/${base}_data.h"
     "${output_dir}/gen-cpp2/${base}_data.cpp"
     "${output_dir}/gen-cpp2/${base}_types.cpp"
+    "${output_dir}/gen-cpp2/${base}_metadata.cpp"
   )
   foreach(service IN LISTS ARG_SERVICES)
     list(APPEND generated_headers