Added GRPC code generator to flatc.

Also added simple (in-process) test.

Change-Id: I38580d554dd52f590e3396ec4846e07546dcf07d
Tested: on Linux.

CMakeLists.txt

@@ -9,6 +9,7 @@ option(FLATBUFFERS_INSTALL "Enable the installation of targets." ON)
 option(FLATBUFFERS_BUILD_FLATLIB "Enable the build of the flatbuffers library" ON)
 option(FLATBUFFERS_BUILD_FLATC "Enable the build of the flatbuffers compiler" ON)
 option(FLATBUFFERS_BUILD_FLATHASH "Enable the build of flathash" ON)
+option(FLATBUFFERS_BUILD_GRPCTEST "Enable the build of grpctest" OFF)
 
 if(NOT FLATBUFFERS_BUILD_FLATC AND FLATBUFFERS_BUILD_TESTS)
     message(WARNING
@@ -39,7 +40,10 @@ set(FlatBuffers_Compiler_SRCS
   src/idl_gen_php.cpp
   src/idl_gen_python.cpp
   src/idl_gen_fbs.cpp
+  src/idl_gen_grpc.cpp
   src/flatc.cpp
+  grpc/src/compiler/cpp_generator.h
+  grpc/src/compiler/cpp_generator.cc
 )
 
 set(FlatHash_SRCS
@@ -76,6 +80,16 @@ set(FlatBuffers_Sample_Text_SRCS
   ${CMAKE_CURRENT_BINARY_DIR}/samples/monster_generated.h
 )
 
+set(FlatBuffers_GRPCTest_SRCS
+  include/flatbuffers/flatbuffers.h
+  include/flatbuffers/grpc.h
+  tests/monster_test.grpc.fb.h
+  tests/monster_test.grpc.fb.cc
+  grpc/tests/grpctest.cpp
+  # file generated by running compiler on samples/monster.fbs
+  ${CMAKE_CURRENT_BINARY_DIR}/samples/monster_generated.h
+)
+
 # source_group(Compiler FILES ${FlatBuffers_Compiler_SRCS})
 # source_group(Tests FILES ${FlatBuffers_Tests_SRCS})
 
@@ -129,6 +143,7 @@ if(BIICODE)
 endif()
 
 include_directories(include)
+include_directories(grpc)
 
 if(FLATBUFFERS_BUILD_FLATLIB)
 add_library(flatbuffers STATIC ${FlatBuffers_Library_SRCS})
@@ -174,6 +189,14 @@ if(FLATBUFFERS_BUILD_TESTS)
   add_executable(flatsampletext ${FlatBuffers_Sample_Text_SRCS})
 endif()
 
+if(FLATBUFFERS_BUILD_GRPCTEST)
+  if(CMAKE_COMPILER_IS_GNUCXX)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unused-parameter")
+  endif()
+  add_executable(grpctest ${FlatBuffers_GRPCTest_SRCS})
+  target_link_libraries(grpctest grpc++_unsecure grpc pthread dl)
+endif()
+
 if(FLATBUFFERS_INSTALL)
   install(DIRECTORY include/flatbuffers DESTINATION include)
   if(FLATBUFFERS_BUILD_FLATLIB)