Exported 'add_arduino_library' function to public API.

It can now be used to add 3rd-party arduino libraries located outside the SDK, or having a name that doesn't comply with the current used scheme (Will be fixed soon).
On the same note - Added an example that uses a 3rd-party/custom arduino library, leveraging the above.

Author: MrPointer

cmake/Platform/Sources/SourcesManager.cmake

@@ -64,7 +64,9 @@ function(get_headers_parent_directories _sources _return_var)
         get_filename_component(header_parent_dir ${header_source} DIRECTORY)
         list(APPEND parent_dirs ${header_parent_dir})
     endforeach ()
-    list(REMOVE_DUPLICATES parent_dirs)
+    if (parent_dirs) # Check parent dirs, could be none if there aren't any headers amongst sources
+        list(REMOVE_DUPLICATES parent_dirs)
+    endif ()
 
     set(${_return_var} ${parent_dirs} PARENT_SCOPE)
 

cmake/Platform/Targets/ArduinoLibraryTarget.cmake

@@ -76,7 +76,7 @@ endfunction()
 #       _board_id - Board ID associated with the linked Core Lib.
 #       _sources - Source and header files to create target from.
 #=============================================================================#
-function(_add_arduino_library _target_name _board_id _sources)
+function(add_arduino_library _target_name _board_id _sources)
 
     _add_arduino_cmake_library(${_target_name} ${_board_id} "${_sources}" "${ARGN}")
     find_dependent_platform_libraries("${_sources}" lib_platform_libs)
@@ -131,7 +131,7 @@ function(find_arduino_library _target_name _library_name _board_id)
                 message(SEND_ERROR "${error_message}")
             else ()
                 set(sources ${library_headers} ${library_sources})
-                _add_arduino_library(${_target_name} ${_board_id} "${sources}" ARCH ${lib_arch})
+                add_arduino_library(${_target_name} ${_board_id} "${sources}" ARCH ${lib_arch})
             endif ()
         endif ()
     endif ()

examples/CMakeLists.txt

@@ -4,6 +4,7 @@ project(Examples LANGUAGES C CXX ASM)
 
 add_subdirectory(hello-world)
 add_subdirectory(arduino-library)
+add_subdirectory(custom-library)
 add_subdirectory(blink-example)
 add_subdirectory(servo-knob-example)
 add_subdirectory(sketch)