Store the dirs you pass into build_flatbuffers as properties.

This allows you to query the generated target for those properties
later, so dependent modules can refer to the directories to, for example,
add them to the include_directories.

Change-Id: I7a6bd34c5c1d08e2ea69b5ad845223297cad1159

CMakeLists.txt

@@ -139,7 +139,9 @@ endfunction()
 #
 # custom_target_name: The generated files will be added as dependencies for a
 # new custom target with this name. You should add that target as a dependency
-# for your main target to ensure these files are built.
+# for your main target to ensure these files are built. You can also retrieve
+# various properties from this target, such as GENERATED_INCLUDES_DIR,
+# BINARY_SCHEMAS_DIR, and COPY_TEXT_SCHEMAS_DIR.
 #
 # additional_dependencies: A list of additional dependencies that you'd like
 # all generated files to depend on. Pass in a blank string if you have none.
@@ -184,11 +186,6 @@ function(build_flatbuffers flatbuffers_schemas
     endif()
   endforeach()
 
-  # Register the include directory we are using.
-  if (NOT ${generated_includes_dir} STREQUAL "")
-    include_directories(${generated_includes_dir})
-  endif()
-
   foreach(schema ${flatbuffers_schemas})
     get_filename_component(filename ${schema} NAME_WE)
     # For each schema, do the things we requested.
@@ -226,6 +223,28 @@ function(build_flatbuffers flatbuffers_schemas
   # to be built.
   add_custom_target(${custom_target_name}
                     DEPENDS ${all_generated_files} ${additional_dependencies})
+
+  # Register the include directory we are using.
+  if (NOT ${generated_includes_dir} STREQUAL "")
+    include_directories(${generated_includes_dir})
+    set_property(TARGET ${custom_target_name}
+      PROPERTY GENERATED_INCLUDES_DIR
+      ${generated_includes_dir})
+  endif()
+
+  # Register the binary schemas dir we are using.
+  if (NOT ${binary_schemas_dir} STREQUAL "")
+    set_property(TARGET ${custom_target_name}
+      PROPERTY BINARY_SCHEMAS_DIR
+      ${binary_schemas_dir})
+  endif()
+
+  # Register the text schema copy dir we are using.
+  if (NOT ${copy_text_schemas_dir} STREQUAL "")
+    set_property(TARGET ${custom_target_name}
+      PROPERTY COPY_TEXT_SCHEMAS_DIR
+      ${copy_text_schemas_dir})
+  endif()
 endfunction()
 
 if(FLATBUFFERS_BUILD_TESTS)