Attach header directory information to the "flatbuffers" library target (#4849)

* Attach header directory information to the "flatbuffers" library target, if the CMake version supports it.

* Cleanup and documentation update

1 files changed, 26 insertions, 1 deletions

diff --git a/docs/source/Building.md b/docs/source/Building.md
index 607bd873..c2faddad 100644
--- a/docs/source/Building.md
+++ b/docs/source/Building.md
@@ -41,7 +41,7 @@ running the `android_sample.sh` script. Optionally, you may go to the
 `flatbuffers/samples/android` folder and build the sample with the
 `build_apk.sh` script or `ndk_build` / `adb` etc.
 
-## Using FlatBuffers in your own projects.
+## Using FlatBuffers in your own projects
 
 For C++, there is usually no runtime to compile, as the code consists of a
 single header, `include/flatbuffers/flatbuffers.h`. You should add the
@@ -55,6 +55,31 @@ To see how to include FlatBuffers in any of our supported languages, please
 view the [Tutorial](@ref flatbuffers_guide_tutorial) and select your appropriate
 language using the radio buttons.
 
+### Using in CMake-based projects
+If you want to use FlatBuffers in a project which already uses CMake, then a more
+robust and flexible approach is to build FlatBuffers as part of that project directly.
+This is done by making the FlatBuffers source code available to the main build
+and adding it using CMake's `add_subdirectory()` command. This has the
+significant advantage that the same compiler and linker settings are used
+between FlatBuffers and the rest of your project, so issues associated with using
+incompatible libraries (eg debug/release), etc. are avoided. This is
+particularly useful on Windows.
+
+Suppose you put FlatBuffers source code in directory `${FLATBUFFERS_SRC_DIR}`.
+To build it as part of your project, add following code to your `CMakeLists.txt` file:
+```cmake
+# Add FlatBuffers directly to our build. This defines the `flatbuffers` target.
+add_subdirectory(${FLATBUFFERS_SRC_DIR}
+                 ${CMAKE_CURRENT_BINARY_DIR}/flatbuffers-build
+                 EXCLUDE_FROM_ALL)
+
+# Now simply link against flatbuffers as needed to your already declared target.
+# The flatbuffers target carry header search path automatically if CMake > 2.8.11.
+target_link_libraries(own_project_target PRIVATE flatbuffers)
+```
+When build your project the `flatbuffers` library will be compiled and linked 
+to a target as part of your project.
+
 #### For Google Play apps
 
 For applications on Google Play that integrate this library, usage is tracked.